CS通用项目系统搭建——三层架构第二天 (补一篇完整的SqlHelper)

#region ExecuteNonQuery（如果是增，删，修）
      /// <summary>
      /// 执行sql命令
      /// </summary>
      /// <param name="connectionString">连接字符串</param>
      /// <param name="commandType">命令类型</param>
      /// <param name="commandText">sql语句/参数化sql语句/存储过程名</param>
      /// <param name="commandParameters">参数</param>
      /// <returns>受影响的行数</returns>
      public static int ExecuteNonQuery(string connectionString, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
      {

          SqlCommand cmd = new SqlCommand();

          using (SqlConnection conn = new SqlConnection(connectionString))
          {
              PrepareCommand(cmd, commandType, conn, commandText, commandParameters);
              int val = cmd.ExecuteNonQuery();

              return val;
          }
      }

      /// <summary>
      /// 执行Sql Server存储过程
      /// 注意：不能执行有out 参数的存储过程
      /// </summary>
      /// <param name="connectionString">连接字符串</param>
      /// <param name="spName">存储过程名</param>
      /// <param name="parameterValues">对象参数</param>
      /// <returns>受影响的行数</returns>
      public static int ExecuteNonQuery(string connectionString, string spName, params object[] parameterValues)
      {

          using (SqlConnection conn = new SqlConnection(connectionString))
          {
              SqlCommand cmd = new SqlCommand();

              PrepareCommand(cmd, conn, spName, parameterValues);
              int val = cmd.ExecuteNonQuery();

              return val;
          }
      }
      #endregion

      #region ExecuteReader（如果只是读数据）
      /// <summary>
      ///  执行sql命令
      /// </summary>
      /// <param name="connectionString">连接字符串</param>
      /// <param name="commandType">命令类型</param>
      /// <param name="commandText">sql语句/参数化sql语句/存储过程名</param>
      /// <param name="commandParameters">参数</param>
      /// <returns>SqlDataReader 对象</returns>
      public static SqlDataReader ExecuteReader(string connectionString, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
      {

          SqlConnection conn = new SqlConnection(connectionString);
          try
          {
              SqlCommand cmd = new SqlCommand();
              PrepareCommand(cmd, commandType, conn, commandText, commandParameters);
              SqlDataReader rdr = cmd.ExecuteReader(CommandBehavior.CloseConnection);

              return rdr;
          }
          catch
          {
              conn.Close();
              throw;
          }
      }

      /// <summary>
      /// 执行Sql Server存储过程
      /// 注意：不能执行有out 参数的存储过程
      /// </summary>
      /// <param name="connectionString">连接字符串</param>
      /// <param name="spName">存储过程名</param>
      /// <param name="parameterValues">对象参数</param>
      /// <returns>受影响的行数</returns>
      public static SqlDataReader ExecuteReader(string connectionString, string spName, params object[] parameterValues)
      {
          SqlConnection conn = new SqlConnection(connectionString);
          try
          {
              SqlCommand cmd = new SqlCommand();

              PrepareCommand(cmd, conn, spName, parameterValues);
              SqlDataReader rdr = cmd.ExecuteReader(CommandBehavior.CloseConnection);

              return rdr;
          }
          catch
          {
              conn.Close();
              throw;
          }

      }
      #endregion

      #region ExecuteDataset（如果查询一个数据集）

      /// <summary>
      /// 执行Sql Server存储过程
      /// 注意：不能执行有out 参数的存储过程
      /// </summary>
      /// <param name="connectionString">连接字符串</param>
      /// <param name="spName">存储过程名</param>
      /// <param name="parameterValues">对象参数</param>
      /// <returns>DataSet对象</returns>
      public static DataSet ExecuteDataset(string connectionString, string spName, params object[] parameterValues)
      {
          using (SqlConnection conn = new SqlConnection(connectionString))
          {
              SqlCommand cmd = new SqlCommand();

              PrepareCommand(cmd, conn, spName, parameterValues);

              using (SqlDataAdapter da = new SqlDataAdapter(cmd))
              {
                  DataSet ds = new DataSet();

                  da.Fill(ds);

                  return ds;
              }
          }
      }


      /// <summary>
      /// 执行Sql 命令
      /// </summary>
      /// <param name="connectionString">连接字符串</param>
      /// <param name="commandType">命令类型</param>
      /// <param name="commandText">sql语句/参数化sql语句/存储过程名</param>
      /// <param name="commandParameters">参数</param>
      /// <returns>DataSet 对象</returns>
      public static DataSet ExecuteDataset(string connectionString, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
      {
          using (SqlConnection conn = new SqlConnection(connectionString))
          {

              SqlCommand cmd = new SqlCommand();

              PrepareCommand(cmd, commandType, conn, commandText, commandParameters);
              using (SqlDataAdapter da = new SqlDataAdapter(cmd))
              {
                  DataSet ds = new DataSet();

                  da.Fill(ds);

                  return ds;
              }
          }
      }

      #endregion

      #region ExecuteScalar (如果你只查询一个值)
      /// <summary>
      /// 执行Sql 命令
      /// </summary>
      /// <param name="connectionString">连接字符串</param>
      /// <param name="commandType">命令类型</param>
      /// <param name="commandText">sql语句/参数化sql语句/存储过程名</param>
      /// <param name="commandParameters">参数</param>
      /// <returns>执行结果对象</returns>
      public static object ExecuteScalar(string connectionString, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
      {
          SqlCommand cmd = new SqlCommand();

          using (SqlConnection conn = new SqlConnection(connectionString))
          {
              PrepareCommand(cmd, commandType, conn, commandText, commandParameters);
              object val = cmd.ExecuteScalar();

              return val;
          }
      }

      /// <summary>
      /// 执行Sql Server存储过程
      /// 注意：不能执行有out 参数的存储过程
      /// </summary>
      /// <param name="connectionString">连接字符串</param>
      /// <param name="spName">存储过程名</param>
      /// <param name="parameterValues">对象参数</param>
      /// <returns>执行结果对象</returns>
      public static object ExecuteScalar(string connectionString, string spName, params object[] parameterValues)
      {
          SqlCommand cmd = new SqlCommand();

          using (SqlConnection conn = new SqlConnection(connectionString))
          {
              PrepareCommand(cmd, conn, spName, parameterValues);
              object val = cmd.ExecuteScalar();

              return val;
          }
      }


      #endregion

      #region Private Method
      /// <summary>
      /// 设置一个等待执行的SqlCommand对象
      /// </summary>
      /// <param name="cmd">SqlCommand 对象，不允许空对象</param>
      /// <param name="conn">SqlConnection 对象，不允许空对象</param>
      /// <param name="commandText">Sql 语句</param>
      /// <param name="cmdParms">SqlParameters  对象,允许为空对象</param>
      private static void PrepareCommand(SqlCommand cmd, CommandType commandType, SqlConnection conn, string commandText, SqlParameter[] cmdParms)
      {
          //打开连接
          if (conn.State != ConnectionState.Open)
              conn.Open();

          //设置SqlCommand对象
          cmd.Connection = conn;
          cmd.CommandText = commandText;
          cmd.CommandType = commandType;

          if (cmdParms != null)
          {
              foreach (SqlParameter parm in cmdParms)
                  cmd.Parameters.Add(parm);
          }
      }

      /// <summary>
      /// 设置一个等待执行存储过程的SqlCommand对象
      /// </summary>
      /// <param name="cmd">SqlCommand 对象，不允许空对象</param>
      /// <param name="conn">SqlConnection 对象，不允许空对象</param>
      /// <param name="spName">Sql 语句</param>
      /// <param name="parameterValues">不定个数的存储过程参数，允许为空</param>
      private static void PrepareCommand(SqlCommand cmd, SqlConnection conn, string spName, params object[] parameterValues)
      {
          //打开连接
          if (conn.State != ConnectionState.Open)
              conn.Open();

          //设置SqlCommand对象
          cmd.Connection = conn;
          cmd.CommandText = spName;
          cmd.CommandType = CommandType.StoredProcedure;

          //获取存储过程的参数
          SqlCommandBuilder.DeriveParameters(cmd);

          //移除Return_Value 参数
          cmd.Parameters.RemoveAt(0);

          //设置参数值
          if (parameterValues != null)
          {
              for (int i = 0; i < cmd.Parameters.Count; i++)
              {
                  cmd.Parameters[i].Value = parameterValues[i];

              }
          }
      }
      #endregion

#region ExecuteNonQuery（如果是增，删，修）      /// <summary>      /// 执行sql命令      /// </summary>      /// <param name="connectionString">连接字符串</param>      /// <param name="commandType">命令类型</param>      /// <param name="commandText">sql语句/参数化sql语句/存储过程名</param>      /// <param name="commandParameters">参数</param>      /// <returns>受影响的行数</returns>      public static int ExecuteNonQuery(string connectionString, CommandType commandType, string commandText, params SqlParameter[] commandParameters)      {
          SqlCommand cmd = new SqlCommand();
          using (SqlConnection conn = new SqlConnection(connectionString))          {              PrepareCommand(cmd, commandType, conn, commandText, commandParameters);              int val = cmd.ExecuteNonQuery();
              return val;          }      }
      /// <summary>      /// 执行Sql Server存储过程      /// 注意：不能执行有out 参数的存储过程      /// </summary>      /// <param name="connectionString">连接字符串</param>      /// <param name="spName">存储过程名</param>      /// <param name="parameterValues">对象参数</param>      /// <returns>受影响的行数</returns>      public static int ExecuteNonQuery(string connectionString, string spName, params object[] parameterValues)      {
          using (SqlConnection conn = new SqlConnection(connectionString))          {              SqlCommand cmd = new SqlCommand();
              PrepareCommand(cmd, conn, spName, parameterValues);              int val = cmd.ExecuteNonQuery();
              return val;          }      }      #endregion
      #region ExecuteReader（如果只是读数据）      /// <summary>      ///  执行sql命令      /// </summary>      /// <param name="connectionString">连接字符串</param>      /// <param name="commandType">命令类型</param>      /// <param name="commandText">sql语句/参数化sql语句/存储过程名</param>      /// <param name="commandParameters">参数</param>      /// <returns>SqlDataReader 对象</returns>      public static SqlDataReader ExecuteReader(string connectionString, CommandType commandType, string commandText, params SqlParameter[] commandParameters)      {
          SqlConnection conn = new SqlConnection(connectionString);          try          {              SqlCommand cmd = new SqlCommand();              PrepareCommand(cmd, commandType, conn, commandText, commandParameters);              SqlDataReader rdr = cmd.ExecuteReader(CommandBehavior.CloseConnection);
              return rdr;          }          catch          {              conn.Close();              throw;          }      }
      /// <summary>      /// 执行Sql Server存储过程      /// 注意：不能执行有out 参数的存储过程      /// </summary>      /// <param name="connectionString">连接字符串</param>      /// <param name="spName">存储过程名</param>      /// <param name="parameterValues">对象参数</param>      /// <returns>受影响的行数</returns>      public static SqlDataReader ExecuteReader(string connectionString, string spName, params object[] parameterValues)      {          SqlConnection conn = new SqlConnection(connectionString);          try          {              SqlCommand cmd = new SqlCommand();
              PrepareCommand(cmd, conn, spName, parameterValues);              SqlDataReader rdr = cmd.ExecuteReader(CommandBehavior.CloseConnection);
              return rdr;          }          catch          {              conn.Close();              throw;          }
      }      #endregion
      #region ExecuteDataset（如果查询一个数据集）
      /// <summary>      /// 执行Sql Server存储过程      /// 注意：不能执行有out 参数的存储过程      /// </summary>      /// <param name="connectionString">连接字符串</param>      /// <param name="spName">存储过程名</param>      /// <param name="parameterValues">对象参数</param>      /// <returns>DataSet对象</returns>      public static DataSet ExecuteDataset(string connectionString, string spName, params object[] parameterValues)      {          using (SqlConnection conn = new SqlConnection(connectionString))          {              SqlCommand cmd = new SqlCommand();
              PrepareCommand(cmd, conn, spName, parameterValues);
              using (SqlDataAdapter da = new SqlDataAdapter(cmd))              {                  DataSet ds = new DataSet();
                  da.Fill(ds);
                  return ds;              }          }      }

      /// <summary>      /// 执行Sql 命令      /// </summary>      /// <param name="connectionString">连接字符串</param>      /// <param name="commandType">命令类型</param>      /// <param name="commandText">sql语句/参数化sql语句/存储过程名</param>      /// <param name="commandParameters">参数</param>      /// <returns>DataSet 对象</returns>      public static DataSet ExecuteDataset(string connectionString, CommandType commandType, string commandText, params SqlParameter[] commandParameters)      {          using (SqlConnection conn = new SqlConnection(connectionString))          {
              SqlCommand cmd = new SqlCommand();
              PrepareCommand(cmd, commandType, conn, commandText, commandParameters);              using (SqlDataAdapter da = new SqlDataAdapter(cmd))              {                  DataSet ds = new DataSet();
                  da.Fill(ds);
                  return ds;              }          }      }
      #endregion
      #region ExecuteScalar (如果你只查询一个值)      /// <summary>      /// 执行Sql 命令      /// </summary>      /// <param name="connectionString">连接字符串</param>      /// <param name="commandType">命令类型</param>      /// <param name="commandText">sql语句/参数化sql语句/存储过程名</param>      /// <param name="commandParameters">参数</param>      /// <returns>执行结果对象</returns>      public static object ExecuteScalar(string connectionString, CommandType commandType, string commandText, params SqlParameter[] commandParameters)      {          SqlCommand cmd = new SqlCommand();
          using (SqlConnection conn = new SqlConnection(connectionString))          {              PrepareCommand(cmd, commandType, conn, commandText, commandParameters);              object val = cmd.ExecuteScalar();
              return val;          }      }
      /// <summary>      /// 执行Sql Server存储过程      /// 注意：不能执行有out 参数的存储过程      /// </summary>      /// <param name="connectionString">连接字符串</param>      /// <param name="spName">存储过程名</param>      /// <param name="parameterValues">对象参数</param>      /// <returns>执行结果对象</returns>      public static object ExecuteScalar(string connectionString, string spName, params object[] parameterValues)      {          SqlCommand cmd = new SqlCommand();
          using (SqlConnection conn = new SqlConnection(connectionString))          {              PrepareCommand(cmd, conn, spName, parameterValues);              object val = cmd.ExecuteScalar();
              return val;          }      }

      #endregion
      #region Private Method      /// <summary>      /// 设置一个等待执行的SqlCommand对象      /// </summary>      /// <param name="cmd">SqlCommand 对象，不允许空对象</param>      /// <param name="conn">SqlConnection 对象，不允许空对象</param>      /// <param name="commandText">Sql 语句</param>      /// <param name="cmdParms">SqlParameters  对象,允许为空对象</param>      private static void PrepareCommand(SqlCommand cmd, CommandType commandType, SqlConnection conn, string commandText, SqlParameter[] cmdParms)      {          //打开连接          if (conn.State != ConnectionState.Open)              conn.Open();
          //设置SqlCommand对象          cmd.Connection = conn;          cmd.CommandText = commandText;          cmd.CommandType = commandType;
          if (cmdParms != null)          {              foreach (SqlParameter parm in cmdParms)                  cmd.Parameters.Add(parm);          }      }
      /// <summary>      /// 设置一个等待执行存储过程的SqlCommand对象      /// </summary>      /// <param name="cmd">SqlCommand 对象，不允许空对象</param>      /// <param name="conn">SqlConnection 对象，不允许空对象</param>      /// <param name="spName">Sql 语句</param>      /// <param name="parameterValues">不定个数的存储过程参数，允许为空</param>      private static void PrepareCommand(SqlCommand cmd, SqlConnection conn, string spName, params object[] parameterValues)      {          //打开连接          if (conn.State != ConnectionState.Open)              conn.Open();
          //设置SqlCommand对象          cmd.Connection = conn;          cmd.CommandText = spName;          cmd.CommandType = CommandType.StoredProcedure;
          //获取存储过程的参数          SqlCommandBuilder.DeriveParameters(cmd);
          //移除Return_Value 参数          cmd.Parameters.RemoveAt(0);
          //设置参数值          if (parameterValues != null)          {              for (int i = 0; i < cmd.Parameters.Count; i++)              {                  cmd.Parameters[i].Value = parameterValues[i];
              }          }      }      #endregion