• 通用数据库帮助类DBHelper(含log日志信息实时记录)


    项目需要,需要一个通用的数据库操作类,增删改查、事务、存储过程、日志记录都要有,于是在已有的帮助类上做了一些改进,并将log4j的.NET版--log4net嵌入其中记录sql的执行环境和状态。

    用起来还是比较顺手的,因此分享一下供参考。其中log4net需要通过VS的NuGet程序包管理器引入然后引用。

      日志记录功能只是个辅助,先说一下数据库帮助类的主体思路:

      成员变量:

    1. 数据库连接字符串
    2. 数据库连接(根据字符串实例化得到的SqlConnection对象)
    3. 事务
    4. 参数键值对
    5. 用于记录日志的实例

      构造方法:(供外部初始化调用)

    1. 无参(默认的连接字符串)
    2. 有参(指定连接字符串)

      辅助功能方法:(主要供内部调用)

    1. 打开、关闭、释放数据库连接(使用比较频繁)
    2. 参数初始化、清空(多个地方用到)
    3. Command生成与设置(每次sql执行必不可少的操作)
    4. GetDataAdapter等中间结果函数(若是返回DataSet,DataTable结果集都会用到)

      供外部调用方法:

    1. 添加参数
    2. 返回执行成败的结果
    3. 返回数据集(DataSet,DataTable,DataReader)
    4. 执行存储过程、事务

    1. LogHelper:

    复制代码
     1 using log4net;
     2 using log4net.Layout;
     3 using System.Collections.Generic;
     4 
     5 namespace CH_Common
     6 {
     7     public class LogHelper
     8     {
     9         private static ILog log;
    10         private static LogHelper logHelper;
    11         public static ILog GetInstance()
    12         {
    13             logHelper = new LogHelper();
    14             return log;
    15         }
    16         public static ILog GetInstance(string configPath)
    17         {
    18             logHelper = new LogHelper(configPath);
    19             return log;
    20         }
    21         private LogHelper()
    22         {
    23             log = LogManager.GetLogger(System.Reflection.MethodBase.GetCurrentMethod().DeclaringType);
    24         }
    25 
    26         private LogHelper(string configPath)
    27         {
    28             log4net.Config.XmlConfigurator.Configure(new System.IO.FileInfo(configPath));
    29             log = LogManager.GetLogger(System.Reflection.MethodBase.GetCurrentMethod().DeclaringType);
    30         }
    31 
    32     }
    33 }
    复制代码

    2. DBHelper:

    复制代码
    using System;
    using System.Collections;
    using System.Collections.Generic;
    using System.Data;
    using System.Data.SqlClient;
    using System.Linq;
    using System.Text;
    using System.Threading.Tasks;
    using log4net;
    using System.Configuration;
    
    namespace CH_Common
    {
        public class DBHelper
        {
            #region 成员变量
            string connectionString;
            SqlConnection connection;
            SqlTransaction transaction;
            Hashtable listParameters;
            private ILog log = LogManager.GetLogger(System.Reflection.MethodBase.GetCurrentMethod().DeclaringType);
            #endregion
    
            #region 构造方法
            /// <summary>
            /// 默认构造方法
            /// </summary>
            public DBHelper()
            {
                this.connectionString = ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString;
                connection = new SqlConnection(connectionString);
            }
    
            /// <summary>
            /// 含参的构造方法
            /// </summary>
            /// <param name="connectionString">连接字符串</param>
            public DBHelper(string connectionString)
            {
                this.connectionString = connectionString;
                connection = new SqlConnection(connectionString);
            }
            #endregion
    
            #region 数据库连接的打开、关闭、释放
            /// <summary>
            /// 打开数据库连接
            /// </summary>
            public void Open()
            {
                if (connection.State == ConnectionState.Closed)
                {
                    connection.Open();
                }
            }
            /// <summary>
            /// 关闭数据库连接
            /// </summary>
            public void Close()
            {
                if (connection.State.ToString() == "Open")
                {
                    connection.Close();
                    InitMember();
                }
            }
            /// <summary>
            /// 参数初始化
            /// </summary>
            void InitMember()
            {
                listParameters = null;
                //cmd = null;
            }
    
            /// <summary>
            /// 释放连接
            /// </summary>
            public void Dispose()
            {
                if (connection != null)
                {
                    connection.Close();
                    connection.Dispose();
                }
                GC.Collect();
            }
            #endregion
    
            #region 设置连接字符串
            /// <summary>
            /// 设置连接字符串
            /// </summary>
            /// <param name="strConnectionString">连接字符串</param>
            public void SetConnection(string strConnectionString)
            {
                connectionString = strConnectionString;
                connection = new SqlConnection(connectionString);
            }
            #endregion
    
            #region Command的生成与设置
            /// <summary>
            /// 设置Command
            /// </summary>
            /// <param name="SQL">SQL文</param>
            /// <param name="cmdType">CommandType</param>
            private SqlCommand SetCmd(string SQL, CommandType cmdType)
            {
                Open();
                SqlCommand cmd = new SqlCommand(SQL, connection);
                if (null != transaction)
                {
                    cmd.Transaction = transaction;
                }
                cmd.CommandType = cmdType;
                cmd.CommandText = SQL;
                cmd.Parameters.Clear();
                string strSQLLog = "";
                if (listParameters != null)
                {
                    foreach (DictionaryEntry parameter in listParameters)
                    {
                        cmd.Parameters.Add(new SqlParameter(parameter.Key.ToString(), parameter.Value));
                        strSQLLog = strSQLLog + "[" + parameter.Key.ToString() + "]=[" + parameter.Value.ToString() + "]";
                    }
                    log.Info(strSQLLog);
                    ClearParameter();
                }
                return cmd;
            }
            /// <summary> 
            /// 生成Commond
            /// </summary> 
            /// <param name="SQL"></param>  
            /// <returns></returns> 
            private SqlCommand CreateCmd(string SQL)
            {
                return SetCmd(SQL, CommandType.Text);
            }
    
            private SqlCommand CreateProc(string procName)
            {
                return SetCmd(procName, CommandType.StoredProcedure);
            }
    
            #endregion
    
            #region SqlDataReader返回
            /// <summary> 
            /// SqlDataReader返回
            /// </summary> 
            /// <param name="SQL">SQL文</param> 
            /// <returns>SqlDataReader</returns> 
            private SqlDataReader ReturnDataReader(string SQL)
            {
                return CreateCmd(SQL).ExecuteReader();
            }
            #endregion
    
            #region SqlParameter参数追加
            /// <summary>
            /// SqlParameter参数追加
            /// </summary>
            /// <param name="ParamName">参数名</param>
            /// <param name="Value">参数值</param>
            public void AddParameter(string ParamName, object Value)
            {
                try
                {
                    if (listParameters == null)
                    {
                        listParameters = new Hashtable();
                    }
                    listParameters.Add(ParamName, Value);
                }
                catch (Exception ex)
                {
                    log.Error("Add SqlParameter Error:  " + ex.Message);
                    log.Error(ex);
                    throw ex;
                }
            }
            #endregion
    
            #region SqlParameter清空
            /// <summary>
            /// SqlParameter清空
            /// </summary>
            public void ClearParameter() { listParameters = null; }
            #endregion
    
            #region SqlDataAdapter适配器返回
            /// <summary>
            /// SqlDataAdapter适配器返回
            /// </summary>
            /// <param name="SQL">SQL语句</param>
            /// <returns>SqlDataAdapter对象</returns>
            private SqlDataAdapter GetDataAdapter(string SQL)
            {
                SqlDataAdapter Da = new SqlDataAdapter();
    
                Da.SelectCommand = SetCmd(SQL, CommandType.Text);
                SqlCommandBuilder custCB = new SqlCommandBuilder(Da);
                return Da;
            }
            #endregion
    
            #region SQL执行
    
            /// <summary>
            /// SQL执行
            /// </summary>
            /// <param name="SQL">SQL语句</param>
            /// <returns>-1:失败 其他:成功</returns>
            public int ExeCmd(string SQL)
            {
                int ret = -1;
    
                string strSQLLog = string.Empty;
                string sqlLog = "";
                if (listParameters != null)
                {
                    strSQLLog = SQL;
                    foreach (DictionaryEntry parameter in listParameters)
                    {
                        strSQLLog = strSQLLog.Replace("@" + parameter.Key.ToString(), "'" + parameter.Value.ToString() + "'");
                        sqlLog = sqlLog + "[" + parameter.Key.ToString() + "]=[" + parameter.Value.ToString() + "]";
                    }
                }
    
                try
                {
                    log.Info("SQL Execute Start:" + SQL + " " + sqlLog);
                    ret = CreateCmd(SQL).ExecuteNonQuery();
                    log.Info("SQL Execute End");
                }
                catch (Exception ex)
                {
                    log.Error("SQL Execute Error Occured:" + SQL + " " + sqlLog);
                    log.Error("SQL Execute ErrorMessage:" + ex.Message);
                    log.Error(ex);
                    RollbackTransaction();
                    throw ex;
                }
                finally
                {
                    if (null == transaction)
                    {
                        Close();
                    }
    
                    ClearParameter();
                }
                return ret;
            }
            #endregion
    
            #region DataSet返回
    
            /// <summary>
            /// SQL执行
            /// </summary>
            /// <param name="SQL">SQL文</param>
            /// <returns>DataSet</returns> 
            public DataSet ReturnDataSet(string SQL)
            {
                DataSet Ds = new DataSet();
                try
                {
                    log.Info("SQL Execute Start:" + SQL);
                    SqlDataAdapter Da = GetDataAdapter(SQL);
                    Da.Fill(Ds);
                    log.Info("SQL Execute End");
                }
                catch (Exception ex)
                {
                    log.Error("SQL Execute Error Occured:" + SQL);
                    log.Error("SQL Execute ErrorMessage:" + ex.Message);
                    log.Error(ex);
                    throw ex;
                }
                finally
                {
                    if (null == transaction)
                    {
                        Close();
                    }
                }
                return Ds;
            }
            #endregion
    
            #region DataTable返回
            /// <summary>
            /// DataTable返回
            /// </summary>
            /// <param name="SQL">SQL文</param>
            /// <returns>DataTable</returns>
            public DataTable ReturnDataTable(string SQL)
            {
                DataTable dt = new DataTable("tempDt");//跨进程序列化,需要为datatable命名
                try
                {
                    log.Info("SQL Execute Start:" + SQL);
                    SqlDataAdapter Da = GetDataAdapter(SQL);
                    Da.Fill(dt);
                    log.Info("SQL Execute End");
                }
                catch (Exception ex)
                {
                    log.Error("SQL Execute Error Occured:" + SQL);
                    log.Error("SQL Execute ErrorMessage:" + ex.Message);
                    log.Error(ex);
                    throw ex;
                }
                finally
                {
                    if (null == transaction)
                    {
                        Close();
                    }
                }
                return dt;
            }
            #endregion
    
            #region 事务
            /// <summary>
            /// 开始事务
            /// </summary>
            public void BeginTransaction()
            {
                Open();
                //cmd = connection.CreateCommand();
                transaction = connection.BeginTransaction();
    
                //cmd.Transaction = transaction;
            }
            /// <summary>
            /// 提交事务
            /// </summary>
            public void CommitTransaction()
            {
                try
                {
                    if (null != transaction)
                    {
                        transaction.Commit();
                    }
                }
                catch (System.Exception ex)
                {
                    log.Error("transaction error:" + ex.Message);
                    log.Error(ex);
                    transaction.Rollback();
                    throw ex;
                }
                finally
                {
                    transaction = null;
                    Close();
                }
            }
            /// <summary>
            /// 回滚事务
            /// </summary>
            public void RollbackTransaction()
            {
                if (null != transaction)
                {
                    transaction.Rollback();
                    transaction = null;
                }
            }
            #endregion
    
            #region 存储过程
            /// <summary>
            /// 执行存储过程
            /// </summary>
            /// <param name="proc_name"></param>
            /// <returns></returns>
            public int ExecProcedure(string proc_name)
            {
                int ret = -1;
    
                string strSQLLog = string.Empty;
                string sqlLog = "";
                if (listParameters != null)
                {
    
                    foreach (DictionaryEntry parameter in listParameters)
                    {
                        strSQLLog = strSQLLog.Replace("@" + parameter.Key.ToString(), "'" + parameter.Value.ToString() + "'");
                        sqlLog = sqlLog + "[" + parameter.Key.ToString() + "]=[" + parameter.Value.ToString() + "]";
                    }
                }
    
                try
                {
                    log.Info("Procedure Execute Start:" + proc_name + " " + sqlLog);
                    ret = CreateProc(proc_name).ExecuteNonQuery();
                    log.Info("Procedure Execute End");
                }
                catch (Exception ex)
                {
                    log.Error("Procedure Execute Error Occured:" + proc_name + " " + sqlLog);
                    log.Error("Procedure Execute ErrorMessage:" + ex.Message);
                    log.Error(ex);
                    RollbackTransaction();
                    throw ex;
                }
                finally
                {
                    if (null == transaction)
                    {
                        Close();
                    }
    
                    ClearParameter();
                }
                return ret;
            }
            #endregion
        }
    }
    复制代码

    3. log4net配置文件:

    复制代码
    <configuration>
      <configSections>
        <section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler,log4net"/>
      </configSections>
      <log4net>
        <!-- 日志输出定义 -->
        <appender name="ReceiveLogFileAppender" type="log4net.Appender.RollingFileAppender">
          <param name="file" type="log4net.Util.PatternString" value="Logs" />
          <param name="LockingModel" type="log4net.Appender.FileAppender+MinimalLock" />
          <param name="StaticLogFileName" value="false" />
          <!--混合(大小与日期)-->
          <param name="rollingStyle" value="Composite" />
          <param name="DatePattern" value="/yyyyMMdd/'info.'yyyyMMdd'.log'" />
          <!--单个日志文件大小上限5M-->
          <param name="maximumFileSize" value="5MB" />
          <!--1.2.3计数类型-->
          <param name="CountDirection" value="1"/>
          <!--最多产生的日志文件数,超过则只保留最新的(n+1)个。设定值value="-1"为不限文件数-->
          <param name="MaxSizeRollBackups" value="-1" />
          <!--追加-->
          <param name="AppendToFile" value="true" />
          <!-- 日志格式 -->
          <layout type="log4net.Layout.PatternLayout">
            <param name="ConversionPattern" value="%d{yyyy/MM/dd_HH:mm:ss.fff} %t %-8p %C %M %m %exception%n" />
          </layout>
          <!-- 应用此配置的过滤器 -->
          <filter type="log4net.Filter.LevelRangeFilter">
            <levelMin value="DEBUG" />
            <levelMax value="INFO" />
          </filter>
        </appender>
        <appender name="ErrorLogFileAppender" type="log4net.Appender.RollingFileAppender">
          <param name="file" type="log4net.Util.PatternString" value="Logs" />
          <param name="LockingModel" type="log4net.Appender.FileAppender+MinimalLock" />
          <param name="StaticLogFileName" value="false" />
          <!--混合(大小与日期)-->
          <param name="rollingStyle" value="Composite" />
          <param name="DatePattern" value="/yyyyMMdd/'error.'yyyyMMdd'.log'" />
          <!--单个日志文件大小上限5M-->
          <param name="maximumFileSize" value="5MB" />
          <!--1.2.3计数类型-->
          <param name="CountDirection" value="1"/>
          <!--最多产生的日志文件数,超过则只保留最新的n个。设定值value="-1"为不限文件数-->
          <param name="MaxSizeRollBackups" value="-1" />
          <!--追加-->
          <param name="AppendToFile" value="true" />
          <!-- 日志格式 -->
          <layout type="log4net.Layout.PatternLayout">
            <param name="ConversionPattern" value="%d{yyyy/MM/dd_HH:mm:ss.fff} %t %-8p %C %M %m %exception%n" />
          </layout>
          <!-- 应用此配置的过滤器---->
          <filter type="log4net.Filter.LevelRangeFilter">
            <levelMin value="ERROR" />
            <levelMax value="FATAL" />
          </filter>
        </appender>
        <root>
          <level value="INFO" />
          <appender-ref ref="ReceiveLogFileAppender" />
          <appender-ref ref="ErrorLogFileAppender" />
        </root>
      </log4net>
    </configuration>
    复制代码

      log4net使用相关参考

      帮助类的用法非常简便:

        1.new 一个DBHelper对象dbhelper出来;

        2.sql文中需要传入参数时:dbhelper.AddParameter(“@para”,“para”);

        3.执行sql返回结果:dbhelper.ReturnDataTable(sql);

      一次搞定,以后的项目基本都可以复用,还是值得花些时间来整理理解的,每次都重新编码或是搜集别人的代码怎么说效率都比较低下,没必要!

                  

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  • 原文地址:https://www.cnblogs.com/zzp0320/p/8177223.html
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