• SQL Server 数据库操作类


        /// <summary>
        /// SQLServerHelper的摘要说明。
        /// </summary>
        public class SQLServerHelper
        {
            public static string connectionString = ConfigurationManager.ConnectionStrings["SQLConnString"].ConnectionString;
    
            #region private utility methods & constructors
    
            //Since this class provides only static methods, make the default constructor private to prevent 
            //instances from being created with "new SqlHelper()".
            private SQLServerHelper()
            {
    
            }
    
            /// <summary>
            /// This method is used to attach array of SqlParameters to a SqlCommand.
            /// 
            /// This method will assign a value of DbNull to any parameter with a direction of
            /// InputOutput and a value of null.  
            /// 
            /// This behavior will prevent default values from being used, but
            /// this will be the less common case than an intended pure output parameter (derived as InputOutput)
            /// where the user provided no input value.
            /// </summary>
            /// <param name="command">The command to which the parameters will be added</param>
            /// <param name="commandParameters">an array of SqlParameters tho be added to command</param>
            private static void AttachParameters(SqlCommand command, SqlParameter[] commandParameters)
            {
                try
                {
                    foreach (SqlParameter p in commandParameters)
                    {
                        //check for derived output value with no value assigned
                        if ((p.Direction == ParameterDirection.InputOutput) && (p.Value == null))
                        {
                            p.Value = DBNull.Value;
                        }
                        else
                        {
                            if (p.Value == null)
                            {
                                p.Value = DBNull.Value;
                            }
                        }
    
                        command.Parameters.Add(p);
                    }
                }
                catch (Exception ex)
                {
                    Utils.WriteLogFile(ex.Message.ToString(), "异常日志");
                }
            }
    
            /// <summary>
            /// This method assigns an array of values to an array of SqlParameters.
            /// </summary>
            /// <param name="commandParameters">array of SqlParameters to be assigned values</param>
            /// <param name="parameterValues">array of Components holding the values to be assigned</param>
            private static void AssignParameterValues(SqlParameter[] commandParameters, object[] parameterValues)
            {
                try
                {
                    if ((commandParameters == null) || (parameterValues == null))
                    {
                        //do nothing if we get no data
                        return;
                    }
    
                    // we must have the same number of values as we pave parameters to put them in
                    if (commandParameters.Length != parameterValues.Length)
                    {
                        throw new ArgumentException("Parameter count does not match Parameter Value count.");
                    }
    
                    //iterate through the SqlParameters, assigning the values from the corresponding position in the 
                    //value array
                    for (int i = 0, j = commandParameters.Length; i < j; i++)
                    {
                        commandParameters[i].Value = parameterValues[i];
                    }
                }
                catch (Exception ex)
                {
                    Utils.WriteLogFile(ex.Message.ToString(), "异常日志");
                }
    
            }
    
            /// <summary>
            /// This method opens (if necessary) and assigns a connection, transaction, command type and parameters 
            /// to the provided command.
            /// </summary>
            /// <param name="command">the SqlCommand to be prepared</param>
            /// <param name="connection">a valid SqlConnection, on which to execute this command</param>
            /// <param name="transaction">a valid SqlTransaction, or 'null'</param>
            /// <param name="commandType">the CommandType (stored procedure, text, etc.)</param>
            /// <param name="commandText">the stored procedure name or T-SQL command</param>
            /// <param name="commandParameters">an array of SqlParameters to be associated with the command or 'null' if no parameters are required</param>
            private static void PrepareCommand(SqlCommand command, SqlConnection connection, SqlTransaction transaction,
                                               CommandType commandType, string commandText, SqlParameter[] commandParameters)
            {
                try
                {
                    //if the provided connection is not open, we will open it
                    if (connection.State != ConnectionState.Open)
                    {
                        connection.Open();
                    }
    
                    //associate the connection with the command
                    command.Connection = connection;
    
                    //set the command text (stored procedure name or SQL statement)
                    command.CommandText = commandText;
    
                    //if we were provided a transaction, assign it.
                    if (transaction != null)
                    {
                        command.Transaction = transaction;
                    }
    
                    //set the command type
                    command.CommandType = commandType;
    
                    //attach the command parameters if they are provided
                    if (commandParameters != null)
                    {
                        AttachParameters(command, commandParameters);
                    }
                }
                catch (Exception ex)
                {
                    Utils.WriteLogFile(ex.Message.ToString(), "异常日志");
                }
    
                return;
            }
    
    
            #endregion private utility methods & constructors
    
            #region DataHelpers
    
            public static string CheckNull(object obj)
            {
                return (string)obj;
            }
    
            public static string CheckNull(DBNull obj)
            {
                return null;
            }
    
            #endregion
    
            #region AddParameters
    
            public static object CheckForNullString(string text)
            {
                if (text == null || text.Trim().Length == 0)
                {
                    return System.DBNull.Value;
                }
                else
                {
                    return text;
                }
            }
    
            public static SqlParameter MakeInParam(string ParamName, object Value)
            {
                return new SqlParameter(ParamName, Value);
            }
    
            /// <summary>
            /// Make input param.
            /// </summary>
            /// <param name="ParamName">Name of param.</param>
            /// <param name="DbType">Param type.</param>
            /// <param name="Size">Param size.</param>
            /// <param name="Value">Param value.</param>
            /// <returns>New parameter.</returns>
            public static SqlParameter MakeInParam(string ParamName, SqlDbType DbType, int Size, object Value)
            {
                return MakeParam(ParamName, DbType, Size, ParameterDirection.Input, Value);
            }
    
            /// <summary>
            /// Make input param.
            /// </summary>
            /// <param name="ParamName">Name of param.</param>
            /// <param name="DbType">Param type.</param>
            /// <param name="Size">Param size.</param>
            /// <returns>New parameter.</returns>
            public static SqlParameter MakeOutParam(string ParamName, SqlDbType DbType, int Size)
            {
                return MakeParam(ParamName, DbType, Size, ParameterDirection.Output, null);
            }
    
            /// <summary>
            /// Make stored procedure param.
            /// </summary>
            /// <param name="ParamName">Name of param.</param>
            /// <param name="DbType">Param type.</param>
            /// <param name="Size">Param size.</param>
            /// <param name="Direction">Parm direction.</param>
            /// <param name="Value">Param value.</param>
            /// <returns>New parameter.</returns>
            public static SqlParameter MakeParam(string ParamName, SqlDbType DbType, Int32 Size,
                                                 ParameterDirection Direction, object Value)
            {
                SqlParameter param;
    
    
                if (Size > 0)
                    param = new SqlParameter(ParamName, DbType, Size);
                else
                    param = new SqlParameter(ParamName, DbType);
    
                param.Direction = Direction;
                if (!(Direction == ParameterDirection.Output && Value == null))
                    param.Value = Value;
    
                return param;
            }
    
    
            #endregion
    
            #region ExecuteNonQuery
    
            /// <summary>
            /// Execute a SqlCommand (that returns no resultset and takes no parameters) against the database specified in 
            /// the connection string. 
            /// </summary>
            /// <remarks>
            /// e.g.:  
            ///  int result = ExecuteNonQuery(connString, CommandType.StoredProcedure, "PublishOrders");
            /// </remarks>
            /// <param name="connectionString">a valid connection string for a SqlConnection</param>
            /// <param name="commandType">the CommandType (stored procedure, text, etc.)</param>
            /// <param name="commandText">the stored procedure name or T-SQL command</param>
            /// <returns>an int representing the number of rows affected by the command</returns>
            public static int ExecuteNonQuery(string connectionString, CommandType commandType, string commandText)
            {
                //pass through the call providing null for the set of SqlParameters
                return ExecuteNonQuery(connectionString, commandType, commandText, (SqlParameter[])null);
            }
    
            public static int ExecuteNonQuery(CommandType commandType, string commandText,
                                              params SqlParameter[] commandParameters)
            {
                //pass through the call providing null for the set of SqlParameters
                return ExecuteNonQuery(connectionString, commandType, commandText, commandParameters);
            }
    
            /// <summary>
            /// Execute a SqlCommand (that returns no resultset) against the database specified in the connection string 
            /// using the provided parameters.
            /// </summary>
            /// <remarks>
            /// e.g.:  
            ///  int result = ExecuteNonQuery(connString, CommandType.StoredProcedure, "PublishOrders", new SqlParameter("?prodid", 24));
            /// </remarks>
            /// <param name="connectionString">a valid connection string for a SqlConnection</param>
            /// <param name="commandType">the CommandType (stored procedure, text, etc.)</param>
            /// <param name="commandText">the stored procedure name or T-SQL command</param>
            /// <param name="commandParameters">an array of SqlParamters used to execute the command</param>
            /// <returns>an int representing the number of rows affected by the command</returns>
            public static int ExecuteNonQuery(string connectionString, CommandType commandType, string commandText,
                                              params SqlParameter[] commandParameters)
            {
                //create & open a SqlConnection, and dispose of it after we are done.
                using (SqlConnection cn = new SqlConnection(connectionString))
                {
                    cn.Open();
                    //call the overload that takes a connection in place of the connection string
                    return ExecuteNonQuery(cn, commandType, commandText, commandParameters);
                }
            }
    
            /// <summary>
            /// Execute a SqlCommand (that returns no resultset and takes no parameters) against the provided SqlConnection. 
            /// </summary>
            /// <remarks>
            /// e.g.:  
            ///  int result = ExecuteNonQuery(conn, CommandType.StoredProcedure, "PublishOrders");
            /// </remarks>
            /// <param name="connection">a valid SqlConnection</param>
            /// <param name="commandType">the CommandType (stored procedure, text, etc.)</param>
            /// <param name="commandText">the stored procedure name or T-SQL command</param>
            /// <returns>an int representing the number of rows affected by the command</returns>
            public static int ExecuteNonQuery(SqlConnection connection, CommandType commandType, string commandText)
            {
                //pass through the call providing null for the set of SqlParameters
                return ExecuteNonQuery(connection, commandType, commandText, (SqlParameter[])null);
            }
    
            /// <summary>
            /// Execute a SqlCommand (that returns no resultset) against the specified SqlConnection 
            /// using the provided parameters.
            /// </summary>
            /// <remarks>
            /// e.g.:  
            ///  int result = ExecuteNonQuery(conn, CommandType.StoredProcedure, "PublishOrders", new SqlParameter("?prodid", 24));
            /// </remarks>
            /// <param name="connection">a valid SqlConnection</param>
            /// <param name="commandType">the CommandType (stored procedure, text, etc.)</param>
            /// <param name="commandText">the stored procedure name or T-SQL command</param>
            /// <param name="commandParameters">an array of SqlParamters used to execute the command</param>
            /// <returns>an int representing the number of rows affected by the command</returns>
            public static int ExecuteNonQuery(SqlConnection connection, CommandType commandType, string commandText,
                                              params SqlParameter[] commandParameters)
            {
                SqlTransaction sqltran;
                sqltran = connection.BeginTransaction();
                int retval = -1;
                try
                {
                    //create a command and prepare it for execution
                    SqlCommand cmd = new SqlCommand();
    
    
                    PrepareCommand(cmd, connection, sqltran, commandType, commandText, commandParameters);
                    //cmd.CommandTimeout = 5;
                    //finally, execute the command.
                    retval = cmd.ExecuteNonQuery();
                    sqltran.Commit();
                    // detach the SqlParameters from the command object, so they can be used again.
                    cmd.Parameters.Clear();
    
                }
                catch (Exception ex)
                {
                    try
                    {
                        sqltran.Rollback();
                    }
                    catch (Exception e)
                    {
                    }
    
                    string str = string.Empty;
                    for (int i = 0; i < commandParameters.Length - 1; i++)
                    {
                        str += commandParameters[i].ParameterName + "=" + commandParameters[i].Value.ToString() + ",";
                    }
                    Utils.WriteLogFile("执行" + commandText + "时" + ex.Message.ToString() + "参数值为:" + str, "异常日志");
                    retval = -1;
                }
                finally
                {
                    connection.Close();
                }
    
                return retval;
            }
    
    
            /// <summary>
            /// Execute a SqlCommand (that returns no resultset and takes no parameters) against the provided SqlTransaction. 
            /// </summary>
            /// <remarks>
            /// e.g.:  
            ///  int result = ExecuteNonQuery(trans, CommandType.StoredProcedure, "PublishOrders");
            /// </remarks>
            /// <param name="transaction">a valid SqlTransaction</param>
            /// <param name="commandType">the CommandType (stored procedure, text, etc.)</param>
            /// <param name="commandText">the stored procedure name or T-SQL command</param>
            /// <returns>an int representing the number of rows affected by the command</returns>
            public static int ExecuteNonQuery(SqlTransaction transaction, CommandType commandType, string commandText)
            {
                //pass through the call providing null for the set of SqlParameters
                return ExecuteNonQuery(transaction, commandType, commandText, (SqlParameter[])null);
            }
    
            /// <summary>
            /// Execute a SqlCommand (that returns no resultset) against the specified SqlTransaction
            /// using the provided parameters.
            /// </summary>
            /// <remarks>
            /// e.g.:  
            ///  int result = ExecuteNonQuery(trans, CommandType.StoredProcedure, "GetOrders", new SqlParameter("?prodid", 24));
            /// </remarks>
            /// <param name="transaction">a valid SqlTransaction</param>
            /// <param name="commandType">the CommandType (stored procedure, text, etc.)</param>
            /// <param name="commandText">the stored procedure name or T-SQL command</param>
            /// <param name="commandParameters">an array of SqlParamters used to execute the command</param>
            /// <returns>an int representing the number of rows affected by the command</returns>
            public static int ExecuteNonQuery(SqlTransaction transaction, CommandType commandType, string commandText,
                                              params SqlParameter[] commandParameters)
            {
                try
                {
                    //create a command and prepare it for execution
                    SqlCommand cmd = new SqlCommand();
                    PrepareCommand(cmd, transaction.Connection, transaction, commandType, commandText, commandParameters);
                    //cmd.CommandTimeout = 5;
                    //finally, execute the command.
                    int retval = cmd.ExecuteNonQuery();
    
                    // detach the SqlParameters from the command object, so they can be used again.
                    cmd.Parameters.Clear();
                    return retval;
                }
                catch (Exception ex)
                {
                    string str = string.Empty;
                    if (commandParameters != null)
                    {
                        for (int i = 0; i < commandParameters.Length - 1; i++)
                        {
                            str += commandParameters[i].ParameterName + "=" + commandParameters[i].Value.ToString() + ",";
                        }
                    }
                    Utils.WriteLogFile("执行" + commandText + "时" + ex.Message.ToString() + "参数值为:" + str, "异常日志");
                    return -1;
                }
                finally
                {
                    //transaction.Connection.Close();
                }
            }
    
    
    
    
            #endregion ExecuteNonQuery
    
            #region ExecuteDataSet
    
            public static DataSet ExecuteDataset(CommandType commandType, string commandText,
                                                 params SqlParameter[] commandParameters)
            {
                //pass through the call providing null for the set of SqlParameters
                return ExecuteDataset(connectionString, commandType, commandText, commandParameters);
            }
    
            /// <summary>
            /// Execute a SqlCommand (that returns a resultset and takes no parameters) against the database specified in 
            /// the connection string. 
            /// </summary>
            /// <remarks>
            /// e.g.:  
            ///  DataSet ds = ExecuteDataset(connString, CommandType.StoredProcedure, "GetOrders");
            /// </remarks>
            /// <param name="connectionString">a valid connection string for a SqlConnection</param>
            /// <param name="commandType">the CommandType (stored procedure, text, etc.)</param>
            /// <param name="commandText">the stored procedure name or T-SQL command</param>
            /// <returns>a dataset containing the resultset generated by the command</returns>
            public static DataSet ExecuteDataset(string connectionString, CommandType commandType, string commandText)
            {
                //pass through the call providing null for the set of SqlParameters
                return ExecuteDataset(connectionString, commandType, commandText, (SqlParameter[])null);
            }
    
            /// <summary>
            /// Execute a SqlCommand (that returns a resultset) against the database specified in the connection string 
            /// using the provided parameters.
            /// </summary>
            /// <remarks>
            /// e.g.:  
            ///  DataSet ds = ExecuteDataset(connString, CommandType.StoredProcedure, "GetOrders", new SqlParameter("?prodid", 24));
            /// </remarks>
            /// <param name="connectionString">a valid connection string for a SqlConnection</param>
            /// <param name="commandType">the CommandType (stored procedure, text, etc.)</param>
            /// <param name="commandText">the stored procedure name or T-SQL command</param>
            /// <param name="commandParameters">an array of SqlParamters used to execute the command</param>
            /// <returns>a dataset containing the resultset generated by the command</returns>
            public static DataSet ExecuteDataset(string connectionString, CommandType commandType, string commandText,
                                                 params SqlParameter[] commandParameters)
            {
                //create & open a SqlConnection, and dispose of it after we are done.
                using (SqlConnection cn = new SqlConnection(connectionString))
                {
                    cn.Open();
    
                    //call the overload that takes a connection in place of the connection string
                    return ExecuteDataset(cn, commandType, commandText, commandParameters);
                }
            }
    
    
    
            /// <summary>
            /// Execute a SqlCommand (that returns a resultset and takes no parameters) against the provided SqlConnection. 
            /// </summary>
            /// <remarks>
            /// e.g.:  
            ///  DataSet ds = ExecuteDataset(conn, CommandType.StoredProcedure, "GetOrders");
            /// </remarks>
            /// <param name="connection">a valid SqlConnection</param>
            /// <param name="commandType">the CommandType (stored procedure, text, etc.)</param>
            /// <param name="commandText">the stored procedure name or T-SQL command</param>
            /// <returns>a dataset containing the resultset generated by the command</returns>
            public static DataSet ExecuteDataset(SqlConnection connection, CommandType commandType, string commandText)
            {
                //pass through the call providing null for the set of SqlParameters
                return ExecuteDataset(connection, commandType, commandText, (SqlParameter[])null);
            }
    
            /// <summary>
            /// Execute a SqlCommand (that returns a resultset) against the specified SqlConnection 
            /// using the provided parameters.
            /// </summary>
            /// <remarks>
            /// e.g.:  
            ///  DataSet ds = ExecuteDataset(conn, CommandType.StoredProcedure, "GetOrders", new SqlParameter("?prodid", 24));
            /// </remarks>
            /// <param name="connection">a valid SqlConnection</param>
            /// <param name="commandType">the CommandType (stored procedure, text, etc.)</param>
            /// <param name="commandText">the stored procedure name or T-SQL command</param>
            /// <param name="commandParameters">an array of SqlParamters used to execute the command</param>
            /// <returns>a dataset containing the resultset generated by the command</returns>
            public static DataSet ExecuteDataset(SqlConnection connection, CommandType commandType, string commandText,
                                                 params SqlParameter[] commandParameters)
            {
                try
                {
                    //create a command and prepare it for execution
                    SqlCommand cmd = new SqlCommand();
                    PrepareCommand(cmd, connection, (SqlTransaction)null, commandType, commandText, commandParameters);
    
                    //create the DataAdapter & DataSet
                    SqlDataAdapter da = new SqlDataAdapter(cmd);
                    DataSet ds = new DataSet();
    
                    //fill the DataSet using default values for DataTable names, etc.
                    da.Fill(ds);
    
                    // detach the SqlParameters from the command object, so they can be used again.			
                    cmd.Parameters.Clear();
                    //return the dataset
                    return ds;
                }
                catch (Exception ex)
                {
                    Utils.WriteLogFile("执行" + commandText + "时" + ex.Message.ToString(), "异常日志");
                }
                finally
                {
                    connection.Close();
                }
                return null;
            }
    
    
            /// <summary>
            /// Execute a SqlCommand (that returns a resultset and takes no parameters) against the provided SqlTransaction. 
            /// </summary>
            /// <remarks>
            /// e.g.:  
            ///  DataSet ds = ExecuteDataset(trans, CommandType.StoredProcedure, "GetOrders");
            /// </remarks>
            /// <param name="transaction">a valid SqlTransaction</param>
            /// <param name="commandType">the CommandType (stored procedure, text, etc.)</param>
            /// <param name="commandText">the stored procedure name or T-SQL command</param>
            /// <returns>a dataset containing the resultset generated by the command</returns>
            public static DataSet ExecuteDataset(SqlTransaction transaction, CommandType commandType, string commandText)
            {
                //pass through the call providing null for the set of SqlParameters
                return ExecuteDataset(transaction, commandType, commandText, (SqlParameter[])null);
            }
    
            /// <summary>
            /// Execute a SqlCommand (that returns a resultset) against the specified SqlTransaction
            /// using the provided parameters.
            /// </summary>
            /// <remarks>
            /// e.g.:  
            ///  DataSet ds = ExecuteDataset(trans, CommandType.StoredProcedure, "GetOrders", new SqlParameter("?prodid", 24));
            /// </remarks>
            /// <param name="transaction">a valid SqlTransaction</param>
            /// <param name="commandType">the CommandType (stored procedure, text, etc.)</param>
            /// <param name="commandText">the stored procedure name or T-SQL command</param>
            /// <param name="commandParameters">an array of SqlParamters used to execute the command</param>
            /// <returns>a dataset containing the resultset generated by the command</returns>
            public static DataSet ExecuteDataset(SqlTransaction transaction, CommandType commandType, string commandText,
                                                 params SqlParameter[] commandParameters)
            {
                try
                {
                    //create a command and prepare it for execution
                    SqlCommand cmd = new SqlCommand();
                    PrepareCommand(cmd, transaction.Connection, transaction, commandType, commandText, commandParameters);
    
                    //create the DataAdapter & DataSet
                    SqlDataAdapter da = new SqlDataAdapter(cmd);
                    DataSet ds = new DataSet();
    
                    //fill the DataSet using default values for DataTable names, etc.
                    da.Fill(ds);
    
                    // detach the SqlParameters from the command object, so they can be used again.
                    cmd.Parameters.Clear();
    
                    //return the dataset
                    return ds;
                }
                catch (Exception ex)
                {
                    transaction.Connection.Close();
                    Utils.WriteLogFile("执行" + commandText + "时" + ex.Message.ToString(), "异常日志");
                }
                return null;
            }
    
    
    
            #endregion ExecuteDataSet
    
            #region ExecuteDataTable
    
            public static DataTable ExecuteDataTable(CommandType commandType, string commandText)
            {
                return ExecuteDataTable(connectionString, commandType, commandText, (SqlParameter[])null);
            }
    
            /// <summary>
            /// Execute a SqlCommand (that returns a resultset and takes no parameters) against the database specified in 
            /// the connection string. 
            /// </summary>
            /// <remarks>
            /// e.g.:  
            ///  DataTable dt = ExecuteDataTable(connString, CommandType.StoredProcedure, "GetOrders");
            /// </remarks>
            /// <param name="connectionString">a valid connection string for a SqlConnection</param>
            /// <param name="commandType">the CommandType (stored procedure, text, etc.)</param>
            /// <param name="commandText">the stored procedure name or T-SQL command</param>
            /// <returns>a DataTable containing the resultset generated by the command</returns>
            public static DataTable ExecuteDataTable(string connectionString, CommandType commandType, string commandText)
            {
                //pass through the call providing null for the set of SqlParameters
                return ExecuteDataTable(connectionString, commandType, commandText, (SqlParameter[])null);
            }
    
            public static DataTable ExecuteDataTable(CommandType commandType, string commandText,
                                                     params SqlParameter[] commandParameters)
            {
                //create & open a SqlConnection, and dispose of it after we are done.
                using (SqlConnection cn = new SqlConnection(connectionString))
                {
                    cn.Open();
    
                    //call the overload that takes a connection in place of the connection string
                    return ExecuteDataTable(cn, commandType, commandText, commandParameters);
                }
            }
    
            /// <summary>
            /// Execute a SqlCommand (that returns a resultset) against the database specified in the connection string 
            /// using the provided parameters.
            /// </summary>
            /// <remarks>
            /// e.g.:  
            ///  DataTable dt = ExecuteDataTable(connString, CommandType.StoredProcedure, "GetOrders", new SqlParameter("?prodid", 24));
            /// </remarks>
            /// <param name="connectionString">a valid connection string for a SqlConnection</param>
            /// <param name="commandType">the CommandType (stored procedure, text, etc.)</param>
            /// <param name="commandText">the stored procedure name or T-SQL command</param>
            /// <param name="commandParameters">an array of SqlParamters used to execute the command</param>
            /// <returns>a DataTable containing the resultset generated by the command</returns>
            public static DataTable ExecuteDataTable(string connectionString, CommandType commandType, string commandText,
                                                     params SqlParameter[] commandParameters)
            {
                //create & open a SqlConnection, and dispose of it after we are done.
                using (SqlConnection cn = new SqlConnection(connectionString))
                {
                    cn.Open();
    
                    //call the overload that takes a connection in place of the connection string
                    return ExecuteDataTable(cn, commandType, commandText, commandParameters);
                }
            }
    
    
    
            /// <summary>
            /// Execute a SqlCommand (that returns a resultset and takes no parameters) against the provided SqlConnection. 
            /// </summary>
            /// <remarks>
            /// e.g.:  
            ///  DataTable dt = ExecuteDataTable(conn, CommandType.StoredProcedure, "GetOrders");
            /// </remarks>
            /// <param name="connection">a valid SqlConnection</param>
            /// <param name="commandType">the CommandType (stored procedure, text, etc.)</param>
            /// <param name="commandText">the stored procedure name or T-SQL command</param>
            /// <returns>a DataTable containing the resultset generated by the command</returns>
            public static DataTable ExecuteDataTable(SqlConnection connection, CommandType commandType, string commandText)
            {
                //pass through the call providing null for the set of SqlParameters
                return ExecuteDataTable(connection, commandType, commandText, (SqlParameter[])null);
            }
    
            /// <summary>
            /// Execute a SqlCommand (that returns a resultset) against the specified SqlConnection 
            /// using the provided parameters.
            /// </summary>
            /// <remarks>
            /// e.g.:  
            ///  DataTable dt = ExecuteDataTable(conn, CommandType.StoredProcedure, "GetOrders", new SqlParameter("?prodid", 24));
            /// </remarks>
            /// <param name="connection">a valid SqlConnection</param>
            /// <param name="commandType">the CommandType (stored procedure, text, etc.)</param>
            /// <param name="commandText">the stored procedure name or T-SQL command</param>
            /// <param name="commandParameters">an array of SqlParamters used to execute the command</param>
            /// <returns>a DataTable containing the resultset generated by the command</returns>
            public static DataTable ExecuteDataTable(SqlConnection connection, CommandType commandType, string commandText,
                                                     params SqlParameter[] commandParameters)
            {
                try
                {
                    //create a command and prepare it for execution
                    SqlCommand cmd = new SqlCommand();
                    cmd.CommandTimeout = 140;
    
                    PrepareCommand(cmd, connection, (SqlTransaction)null, commandType, commandText, commandParameters);
    
                    //create the DataAdapter & DataTable
                    SqlDataAdapter da = new SqlDataAdapter(cmd);
                    DataTable dt = new DataTable();
    
                    //fill the DataTable using default values for DataTable names, etc.
                    da.Fill(dt);
    
                    // detach the SqlParameters from the command object, so they can be used again.			
                    cmd.Parameters.Clear();
    
                    return dt;
                }
                catch (Exception ex)
                {
                    Utils.WriteLogFile("执行" + commandText + "时" + ex.Message.ToString(), "异常日志");
                }
                finally
                {
                    connection.Close();
                }
                return null;
            }
    
    
            /// <summary>
            /// Execute a SqlCommand (that returns a resultset and takes no parameters) against the provided SqlTransaction. 
            /// </summary>
            /// <remarks>
            /// e.g.:  
            ///  DataTable dt = ExecuteDataTable(trans, CommandType.StoredProcedure, "GetOrders");
            /// </remarks>
            /// <param name="transaction">a valid SqlTransaction</param>
            /// <param name="commandType">the CommandType (stored procedure, text, etc.)</param>
            /// <param name="commandText">the stored procedure name or T-SQL command</param>
            /// <returns>a DataTable containing the resultset generated by the command</returns>
            public static DataTable ExecuteDataTable(SqlTransaction transaction, CommandType commandType, string commandText)
            {
                //pass through the call providing null for the set of SqlParameters
                return ExecuteDataTable(transaction, commandType, commandText, (SqlParameter[])null);
            }
    
            /// <summary>
            /// Execute a SqlCommand (that returns a resultset) against the specified SqlTransaction
            /// using the provided parameters.
            /// </summary>
            /// <remarks>
            /// e.g.:  
            ///  DataTable dt = ExecuteDataTable(trans, CommandType.StoredProcedure, "GetOrders", new SqlParameter("?prodid", 24));
            /// </remarks>
            /// <param name="transaction">a valid SqlTransaction</param>
            /// <param name="commandType">the CommandType (stored procedure, text, etc.)</param>
            /// <param name="commandText">the stored procedure name or T-SQL command</param>
            /// <param name="commandParameters">an array of SqlParamters used to execute the command</param>
            /// <returns>a DataTable containing the resultset generated by the command</returns>
            public static DataTable ExecuteDataTable(SqlTransaction transaction, CommandType commandType, string commandText,
                                                     params SqlParameter[] commandParameters)
            {
                try
                {
                    //create a command and prepare it for execution
                    SqlCommand cmd = new SqlCommand();
                    cmd.CommandTimeout = 140;
                    PrepareCommand(cmd, transaction.Connection, transaction, commandType, commandText, commandParameters);
    
                    //create the DataAdapter & DataTable
                    SqlDataAdapter da = new SqlDataAdapter(cmd);
                    DataTable dt = new DataTable();
    
                    //fill the DataTable using default values for DataTable names, etc.
                    da.Fill(dt);
    
                    // detach the SqlParameters from the command object, so they can be used again.
                    cmd.Parameters.Clear();
    
                    //return the DataTable
                    return dt;
                }
                catch (Exception ex)
                {
                    transaction.Connection.Close();
                    Utils.WriteLogFile("执行" + commandText + "时" + ex.Message.ToString(), "异常日志");
                }
                return null;
            }
    
    
    
            #endregion ExecuteDataTable
    
            #region ExecuteReader
    
            /// <summary>
            /// this enum is used to indicate whether the connection was provided by the caller, or created by SqlHelper, so that
            /// we can set the appropriate CommandBehavior when calling ExecuteReader()
            /// </summary>
            private enum SqlConnectionOwnership
            {
                /// <summary>Connection is owned and managed by SqlHelper</summary>
                Internal,
    
                /// <summary>Connection is owned and managed by the caller</summary>
                External
            }
    
            /// <summary>
            /// Create and prepare a SqlCommand, and call ExecuteReader with the appropriate CommandBehavior.
            /// </summary>
            /// <remarks>
            /// If we created and opened the connection, we want the connection to be closed when the DataReader is closed.
            /// 
            /// If the caller provided the connection, we want to leave it to them to manage.
            /// </remarks>
            /// <param name="connection">a valid SqlConnection, on which to execute this command</param>
            /// <param name="transaction">a valid SqlTransaction, or 'null'</param>
            /// <param name="commandType">the CommandType (stored procedure, text, etc.)</param>
            /// <param name="commandText">the stored procedure name or T-SQL command</param>
            /// <param name="commandParameters">an array of SqlParameters to be associated with the command or 'null' if no parameters are required</param>
            /// <param name="connectionOwnership">indicates whether the connection parameter was provided by the caller, or created by SqlHelper</param>
            /// <returns>SqlDataReader containing the results of the command</returns>
            private static SqlDataReader ExecuteReader(SqlConnection connection, SqlTransaction transaction,
                                                       CommandType commandType, string commandText,
                                                       SqlParameter[] commandParameters,
                                                       SqlConnectionOwnership connectionOwnership)
            {
                try
                {
                    //create a command and prepare it for execution
                    SqlCommand cmd = new SqlCommand();
                    PrepareCommand(cmd, connection, transaction, commandType, commandText, commandParameters);
    
                    //create a reader
                    SqlDataReader dr;
    
                    // call ExecuteReader with the appropriate CommandBehavior
                    if (connectionOwnership == SqlConnectionOwnership.External)
                    {
                        dr = cmd.ExecuteReader();
                    }
                    else
                    {
                        dr = cmd.ExecuteReader(CommandBehavior.CloseConnection);
                    }
    
                    // detach the SqlParameters from the command object, so they can be used again.
                    cmd.Parameters.Clear();
    
                    return dr;
                }
                catch (Exception ex)
                {
                    connection.Close();
                    Utils.WriteLogFile("执行" + commandText + "时" + ex.Message.ToString(), "异常日志");
                }
                return null;
            }
    
            public static SqlDataReader ExecuteReader(CommandType commandType, string commandText)
            {
                //pass through the call providing null for the set of SqlParameters
                return ExecuteReader(connectionString, commandType, commandText, (SqlParameter[])null);
            }
    
            public static SqlDataReader ExecuteReader(CommandType commandType, string commandText,
                                                      params SqlParameter[] commandParameters)
            {
                //pass through the call providing null for the set of SqlParameters
                return ExecuteReader(connectionString, commandType, commandText, commandParameters);
            }
    
            /// <summary>
            /// Execute a SqlCommand (that returns a resultset and takes no parameters) against the database specified in 
            /// the connection string. 
            /// </summary>
            /// <remarks>
            /// e.g.:  
            ///  SqlDataReader dr = ExecuteReader(connString, CommandType.StoredProcedure, "GetOrders");
            /// </remarks>
            /// <param name="connectionString">a valid connection string for a SqlConnection</param>
            /// <param name="commandType">the CommandType (stored procedure, text, etc.)</param>
            /// <param name="commandText">the stored procedure name or T-SQL command</param>
            /// <returns>a SqlDataReader containing the resultset generated by the command</returns>
            public static SqlDataReader ExecuteReader(string connectionString, CommandType commandType, string commandText)
            {
                //pass through the call providing null for the set of SqlParameters
                return ExecuteReader(connectionString, commandType, commandText, (SqlParameter[])null);
            }
    
            /// <summary>
            /// Execute a SqlCommand (that returns a resultset) against the database specified in the connection string 
            /// using the provided parameters.
            /// </summary>
            /// <remarks>
            /// e.g.:  
            ///  SqlDataReader dr = ExecuteReader(connString, CommandType.StoredProcedure, "GetOrders", new SqlParameter("?prodid", 24));
            /// </remarks>
            /// <param name="connectionString">a valid connection string for a SqlConnection</param>
            /// <param name="commandType">the CommandType (stored procedure, text, etc.)</param>
            /// <param name="commandText">the stored procedure name or T-SQL command</param>
            /// <param name="commandParameters">an array of SqlParamters used to execute the command</param>
            /// <returns>a SqlDataReader containing the resultset generated by the command</returns>
            public static SqlDataReader ExecuteReader(string connectionString, CommandType commandType, string commandText,
                                                      params SqlParameter[] commandParameters)
            {
                //create & open a SqlConnection
                SqlConnection cn = new SqlConnection(connectionString);
                cn.Open();
    
                try
                {
                    //call the private overload that takes an internally owned connection in place of the connection string
                    return ExecuteReader(cn, null, commandType, commandText, commandParameters,
                                         SqlConnectionOwnership.Internal);
                }
                catch
                {
                    //if we fail to return the SqlDatReader, we need to close the connection ourselves
                    cn.Close();
                    throw;
                }
            }
    
            /// <summary>
            /// Execute a SqlCommand (that returns a resultset and takes no parameters) against the provided SqlConnection. 
            /// </summary>
            /// <remarks>
            /// e.g.:  
            ///  SqlDataReader dr = ExecuteReader(conn, CommandType.StoredProcedure, "GetOrders");
            /// </remarks>
            /// <param name="connection">a valid SqlConnection</param>
            /// <param name="commandType">the CommandType (stored procedure, text, etc.)</param>
            /// <param name="commandText">the stored procedure name or T-SQL command</param>
            /// <returns>a SqlDataReader containing the resultset generated by the command</returns>
            public static SqlDataReader ExecuteReader(SqlConnection connection, CommandType commandType, string commandText)
            {
                //pass through the call providing null for the set of SqlParameters
                return ExecuteReader(connection, commandType, commandText, (SqlParameter[])null);
            }
    
            /// <summary>
            /// Execute a SqlCommand (that returns a resultset) against the specified SqlConnection 
            /// using the provided parameters.
            /// </summary>
            /// <remarks>
            /// e.g.:  
            ///  SqlDataReader dr = ExecuteReader(conn, CommandType.StoredProcedure, "GetOrders", new SqlParameter("?prodid", 24));
            /// </remarks>
            /// <param name="connection">a valid SqlConnection</param>
            /// <param name="commandType">the CommandType (stored procedure, text, etc.)</param>
            /// <param name="commandText">the stored procedure name or T-SQL command</param>
            /// <param name="commandParameters">an array of SqlParamters used to execute the command</param>
            /// <returns>a SqlDataReader containing the resultset generated by the command</returns>
            public static SqlDataReader ExecuteReader(SqlConnection connection, CommandType commandType, string commandText,
                                                      params SqlParameter[] commandParameters)
            {
                //pass through the call to the private overload using a null transaction value and an externally owned connection
                return ExecuteReader(connection, (SqlTransaction)null, commandType, commandText, commandParameters,
                                     SqlConnectionOwnership.External);
            }
    
    
            /// <summary>
            /// Execute a SqlCommand (that returns a resultset and takes no parameters) against the provided SqlTransaction. 
            /// </summary>
            /// <remarks>
            /// e.g.:  
            ///  SqlDataReader dr = ExecuteReader(trans, CommandType.StoredProcedure, "GetOrders");
            /// </remarks>
            /// <param name="transaction">a valid SqlTransaction</param>
            /// <param name="commandType">the CommandType (stored procedure, text, etc.)</param>
            /// <param name="commandText">the stored procedure name or T-SQL command</param>
            /// <returns>a SqlDataReader containing the resultset generated by the command</returns>
            public static SqlDataReader ExecuteReader(SqlTransaction transaction, CommandType commandType,
                                                      string commandText)
            {
                //pass through the call providing null for the set of SqlParameters
                return ExecuteReader(transaction, commandType, commandText, (SqlParameter[])null);
            }
    
            /// <summary>
            /// Execute a SqlCommand (that returns a resultset) against the specified SqlTransaction
            /// using the provided parameters.
            /// </summary>
            /// <remarks>
            /// e.g.:  
            ///   SqlDataReader dr = ExecuteReader(trans, CommandType.StoredProcedure, "GetOrders", new SqlParameter("?prodid", 24));
            /// </remarks>
            /// <param name="transaction">a valid SqlTransaction</param>
            /// <param name="commandType">the CommandType (stored procedure, text, etc.)</param>
            /// <param name="commandText">the stored procedure name or T-SQL command</param>
            /// <param name="commandParameters">an array of SqlParamters used to execute the command</param>
            /// <returns>a SqlDataReader containing the resultset generated by the command</returns>
            public static SqlDataReader ExecuteReader(SqlTransaction transaction, CommandType commandType,
                                                      string commandText, params SqlParameter[] commandParameters)
            {
                //pass through to private overload, indicating that the connection is owned by the caller
                return ExecuteReader(transaction.Connection, transaction, commandType, commandText, commandParameters,
                                     SqlConnectionOwnership.External);
            }
    
            #endregion ExecuteReader
    
            #region ExecuteScalar
    
            /// <summary>
            /// Execute a SqlCommand (that returns a 1x1 resultset and takes no parameters) against the database specified in 
            /// the connection string. 
            /// </summary>
            /// <remarks>
            /// e.g.:  
            ///  int orderCount = (int)ExecuteScalar(connString, CommandType.StoredProcedure, "GetOrderCount");
            /// </remarks>
            /// <param name="connectionString">a valid connection string for a SqlConnection</param>
            /// <param name="commandType">the CommandType (stored procedure, text, etc.)</param>
            /// <param name="commandText">the stored procedure name or T-SQL command</param>
            /// <returns>an object containing the value in the 1x1 resultset generated by the command</returns>
            public static object ExecuteScalar(string connectionString, CommandType commandType, string commandText)
            {
                //pass through the call providing null for the set of SqlParameters
                return ExecuteScalar(connectionString, commandType, commandText, (SqlParameter[])null);
            }
    
            public static object ExecuteScalar(CommandType commandType, string commandText,
                                               params SqlParameter[] commandParameters)
            {
                //pass through the call providing null for the set of SqlParameters
                return ExecuteScalar(connectionString, commandType, commandText, commandParameters);
            }
    
            /// <summary>
            /// Execute a SqlCommand (that returns a 1x1 resultset) against the database specified in the connection string 
            /// using the provided parameters.
            /// </summary>
            /// <remarks>
            /// e.g.:  
            ///  int orderCount = (int)ExecuteScalar(connString, CommandType.StoredProcedure, "GetOrderCount", new SqlParameter("?prodid", 24));
            /// </remarks>
            /// <param name="connectionString">a valid connection string for a SqlConnection</param>
            /// <param name="commandType">the CommandType (stored procedure, text, etc.)</param>
            /// <param name="commandText">the stored procedure name or T-SQL command</param>
            /// <param name="commandParameters">an array of SqlParamters used to execute the command</param>
            /// <returns>an object containing the value in the 1x1 resultset generated by the command</returns>
            public static object ExecuteScalar(string connectionString, CommandType commandType, string commandText,
                                               params SqlParameter[] commandParameters)
            {
                //create & open a SqlConnection, and dispose of it after we are done.
                using (SqlConnection cn = new SqlConnection(connectionString))
                {
                    cn.Open();
    
                    //call the overload that takes a connection in place of the connection string
                    return ExecuteScalar(cn, commandType, commandText, commandParameters);
                }
            }
    
            /// <summary>
            /// Execute a SqlCommand (that returns a 1x1 resultset and takes no parameters) against the provided SqlConnection. 
            /// </summary>
            /// <remarks>
            /// e.g.:  
            ///  int orderCount = (int)ExecuteScalar(conn, CommandType.StoredProcedure, "GetOrderCount");
            /// </remarks>
            /// <param name="connection">a valid SqlConnection</param>
            /// <param name="commandType">the CommandType (stored procedure, text, etc.)</param>
            /// <param name="commandText">the stored procedure name or T-SQL command</param>
            /// <returns>an object containing the value in the 1x1 resultset generated by the command</returns>
            public static object ExecuteScalar(SqlConnection connection, CommandType commandType, string commandText)
            {
                //pass through the call providing null for the set of SqlParameters
                return ExecuteScalar(connection, commandType, commandText, (SqlParameter[])null);
            }
    
            /// <summary>
            /// Execute a SqlCommand (that returns a 1x1 resultset) against the specified SqlConnection 
            /// using the provided parameters.
            /// </summary>
            /// <remarks>
            /// e.g.:  
            ///  int orderCount = (int)ExecuteScalar(conn, CommandType.StoredProcedure, "GetOrderCount", new SqlParameter("?prodid", 24));
            /// </remarks>
            /// <param name="connection">a valid SqlConnection</param>
            /// <param name="commandType">the CommandType (stored procedure, text, etc.)</param>
            /// <param name="commandText">the stored procedure name or T-SQL command</param>
            /// <param name="commandParameters">an array of SqlParamters used to execute the command</param>
            /// <returns>an object containing the value in the 1x1 resultset generated by the command</returns>
            public static object ExecuteScalar(SqlConnection connection, CommandType commandType, string commandText,
                                               params SqlParameter[] commandParameters)
            {
                try
                {
                    //create a command and prepare it for execution
                    SqlCommand cmd = new SqlCommand();
                    PrepareCommand(cmd, connection, (SqlTransaction)null, commandType, commandText, commandParameters);
    
                    //execute the command & return the results
                    object retval = cmd.ExecuteScalar();
    
                    // detach the SqlParameters from the command object, so they can be used again.
                    cmd.Parameters.Clear();
                    return retval;
                }
                catch (Exception ex)
                {
                    Utils.WriteLogFile("执行" + commandText + "时" + ex.Message.ToString(), "异常日志");
                }
                finally
                {
                    connection.Close();
                }
                return null;
            }
    
            /// <summary>
            /// Execute a SqlCommand (that returns a 1x1 resultset and takes no parameters) against the provided SqlTransaction. 
            /// </summary>
            /// <remarks>
            /// e.g.:  
            ///  int orderCount = (int)ExecuteScalar(trans, CommandType.StoredProcedure, "GetOrderCount");
            /// </remarks>
            /// <param name="transaction">a valid SqlTransaction</param>
            /// <param name="commandType">the CommandType (stored procedure, text, etc.)</param>
            /// <param name="commandText">the stored procedure name or T-SQL command</param>
            /// <returns>an object containing the value in the 1x1 resultset generated by the command</returns>
            public static object ExecuteScalar(SqlTransaction transaction, CommandType commandType, string commandText)
            {
                //pass through the call providing null for the set of SqlParameters
                return ExecuteScalar(transaction, commandType, commandText, (SqlParameter[])null);
            }
    
            /// <summary>
            /// Execute a SqlCommand (that returns a 1x1 resultset) against the specified SqlTransaction
            /// using the provided parameters.
            /// </summary>
            /// <remarks>
            /// e.g.:  
            ///  int orderCount = (int)ExecuteScalar(trans, CommandType.StoredProcedure, "GetOrderCount", new SqlParameter("?prodid", 24));
            /// </remarks>
            /// <param name="transaction">a valid SqlTransaction</param>
            /// <param name="commandType">the CommandType (stored procedure, text, etc.)</param>
            /// <param name="commandText">the stored procedure name or T-SQL command</param>
            /// <param name="commandParameters">an array of SqlParamters used to execute the command</param>
            /// <returns>an object containing the value in the 1x1 resultset generated by the command</returns>
            public static object ExecuteScalar(SqlTransaction transaction, CommandType commandType, string commandText,
                                               params SqlParameter[] commandParameters)
            {
                try
                {
                    //create a command and prepare it for execution
                    SqlCommand cmd = new SqlCommand();
                    PrepareCommand(cmd, transaction.Connection, transaction, commandType, commandText, commandParameters);
    
                    //execute the command & return the results
                    object retval = cmd.ExecuteScalar();
    
                    // detach the SqlParameters from the command object, so they can be used again.
                    cmd.Parameters.Clear();
                    return retval;
                }
                catch (Exception ex)
                {
                    transaction.Connection.Close();
                    Utils.WriteLogFile("执行" + commandText + "时" + ex.Message.ToString(), "异常日志");
                }
                return null;
            }
    
    
            #endregion ExecuteScalar
    
        }
    
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  • 原文地址:https://www.cnblogs.com/Warmsunshine/p/5740640.html
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