dbhelp.cs

 using System;
 using System.Data;
 using System.Data.Common;
 using System.Configuration;

    public class DbHelper
    {
        private static string dbProviderName = ConfigurationManager.AppSettings["DbHelperProvider"];
        private static string dbConnectionString = ConfigurationManager.AppSettings["DbHelperConnectionString"];

        private DbConnection connection;
        public DbHelper()
        {
            this.connection = CreateConnection(DbHelper.dbConnectionString);
        }
        public DbHelper(string connectionString)
        {
            this.connection = CreateConnection(connectionString);
        }
        public static DbConnection CreateConnection()
        {
            DbProviderFactory dbfactory = DbProviderFactories.GetFactory(DbHelper.dbProviderName);
            DbConnection dbconn = dbfactory.CreateConnection();
            dbconn.ConnectionString = DbHelper.dbConnectionString;
            return dbconn;
        }
        public static DbConnection CreateConnection(string connectionString)
        {
            DbProviderFactory dbfactory = DbProviderFactories.GetFactory(DbHelper.dbProviderName);
            DbConnection dbconn = dbfactory.CreateConnection();
            dbconn.ConnectionString = connectionString;
            return dbconn;
        }

        public DbCommand GetStoredProcCommond(string storedProcedure)
        {
            DbCommand dbCommand = connection.CreateCommand();
            dbCommand.CommandText = storedProcedure;
            dbCommand.CommandType = CommandType.StoredProcedure;
            return dbCommand;
        }
        public DbCommand GetSqlStringCommond(string sqlQuery)
        {
            DbCommand dbCommand = connection.CreateCommand();
            dbCommand.CommandText = sqlQuery;
            dbCommand.CommandType = CommandType.Text;
            return dbCommand;
        }

        #region 增加参数
        public void AddParameterCollection(DbCommand cmd, DbParameterCollection dbParameterCollection)
        {
            foreach (DbParameter dbParameter in dbParameterCollection)
            {
                cmd.Parameters.Add(dbParameter);
            }
        }
        public void AddOutParameter(DbCommand cmd, string parameterName, DbType dbType, int size)
        {
            DbParameter dbParameter = cmd.CreateParameter();
            dbParameter.DbType = dbType;
            dbParameter.ParameterName = parameterName;
            dbParameter.Size = size;
            dbParameter.Direction = ParameterDirection.Output;
            cmd.Parameters.Add(dbParameter);
        }
        public void AddInParameter(DbCommand cmd, string parameterName, DbType dbType, object value)
        {
            DbParameter dbParameter = cmd.CreateParameter();
            dbParameter.DbType = dbType;
            dbParameter.ParameterName = parameterName;
            dbParameter.Value = value;
            dbParameter.Direction = ParameterDirection.Input;
            cmd.Parameters.Add(dbParameter);
        }
        public void AddReturnParameter(DbCommand cmd, string parameterName, DbType dbType)
        {
            DbParameter dbParameter = cmd.CreateParameter();
            dbParameter.DbType = dbType;
            dbParameter.ParameterName = parameterName;
            dbParameter.Direction = ParameterDirection.ReturnValue;
            cmd.Parameters.Add(dbParameter);
        }
        public DbParameter GetParameter(DbCommand cmd, string parameterName)
        {
            return cmd.Parameters[parameterName];
        }

        #endregion

        #region 执行
        public DataSet ExecuteDataSet(DbCommand cmd)
        {
            DbProviderFactory dbfactory = DbProviderFactories.GetFactory(DbHelper.dbProviderName);
            DbDataAdapter dbDataAdapter = dbfactory.CreateDataAdapter();
            dbDataAdapter.SelectCommand = cmd;
            DataSet ds = new DataSet();
            dbDataAdapter.Fill(ds);
            return ds;
        }

        public DataTable ExecuteDataTable(DbCommand cmd)
        {
            DbProviderFactory dbfactory = DbProviderFactories.GetFactory(DbHelper.dbProviderName);
            DbDataAdapter dbDataAdapter = dbfactory.CreateDataAdapter();
            dbDataAdapter.SelectCommand = cmd;
            DataTable dataTable = new DataTable();
            dbDataAdapter.Fill(dataTable);
            return dataTable;
        }

        public DbDataReader ExecuteReader(DbCommand cmd)
        {
            cmd.Connection.Open();
            DbDataReader reader = cmd.ExecuteReader(CommandBehavior.CloseConnection);
            return reader;
        }
        public int ExecuteNonQuery(DbCommand cmd)
        {
            cmd.Connection.Open();
            int ret = cmd.ExecuteNonQuery();
            cmd.Connection.Close();
            return ret;
        }

        public int ExecuteNonQuery(string sql)
        {
            DbCommand cmd = GetSqlStringCommond(sql);
            cmd.Connection.Open();
            int ret = cmd.ExecuteNonQuery();
            cmd.Connection.Close();
            return ret;
        }

        public object ExecuteScalar(DbCommand cmd)
        {
            cmd.Connection.Open();
            object ret = cmd.ExecuteScalar();
            cmd.Connection.Close();
            return ret;
        }
        #endregion        

        #region 执行事务
        public DataSet ExecuteDataSet(DbCommand cmd,Trans t)
        {
            cmd.Connection = t.DbConnection;
            cmd.Transaction = t.DbTrans;
            DbProviderFactory dbfactory = DbProviderFactories.GetFactory(DbHelper.dbProviderName);
            DbDataAdapter dbDataAdapter = dbfactory.CreateDataAdapter();
            dbDataAdapter.SelectCommand = cmd;
            DataSet ds = new DataSet();
            dbDataAdapter.Fill(ds);
            return ds;
        }

        public  DataSet ExecuteDataSet(string sql)
        {
            DbCommand cmd = GetSqlStringCommond(sql);
            DataSet ds = ExecuteDataSet(cmd);
            return ds;
        }

        public DataTable ExecuteDataTable(DbCommand cmd, Trans t)
        {
            cmd.Connection = t.DbConnection;
            cmd.Transaction = t.DbTrans;
            DbProviderFactory dbfactory = DbProviderFactories.GetFactory(DbHelper.dbProviderName);
            DbDataAdapter dbDataAdapter = dbfactory.CreateDataAdapter();
            dbDataAdapter.SelectCommand = cmd;
            DataTable dataTable = new DataTable();
            dbDataAdapter.Fill(dataTable);
            return dataTable;
        }

        public  DataTable ExecuteDataTable(string sql)
        {
            DbCommand cmd = GetSqlStringCommond(sql);
            DataTable dt = ExecuteDataTable(cmd);
            return dt;
        }

        public DbDataReader ExecuteReader(DbCommand cmd, Trans t)
        {
            cmd.Connection.Close();
            cmd.Connection = t.DbConnection;
            cmd.Transaction = t.DbTrans;
            DbDataReader reader = cmd.ExecuteReader();
            DataTable dt = new DataTable();
            return reader;
        }
        public int ExecuteNonQuery(DbCommand cmd, Trans t)
        {
            cmd.Connection.Close();
            cmd.Connection = t.DbConnection;
            cmd.Transaction = t.DbTrans;
            int ret = cmd.ExecuteNonQuery();
            return ret;
        }

        public object ExecuteScalar(DbCommand cmd, Trans t)
        {
            cmd.Connection.Close();
            cmd.Connection = t.DbConnection;
            cmd.Transaction = t.DbTrans;
            object ret = cmd.ExecuteScalar();
            return ret;
        }
        #endregion
    }

    public class Trans : IDisposable
    {
        private DbConnection conn;
        private DbTransaction dbTrans;
        public DbConnection DbConnection
        {
            get { return this.conn; }
        }
        public DbTransaction DbTrans
        {
            get { return this.dbTrans; }
        }

        public Trans()
        {
            conn = DbHelper.CreateConnection();
            conn.Open();
            dbTrans = conn.BeginTransaction();
        }
        public Trans(string connectionString)
        {
            conn = DbHelper.CreateConnection(connectionString);
            conn.Open();
            dbTrans = conn.BeginTransaction();
        }
        public void Commit()
        {
            dbTrans.Commit();
            this.Colse();
        }

        public void RollBack()
        {
            dbTrans.Rollback();
            this.Colse();
        }

        public void Dispose()
        {
            this.Colse();
        }

        public void Colse()
        {
            if (conn.State == System.Data.ConnectionState.Open)
            {
                conn.Close();
            }
        }
    }

基本的使用

 private DbHelper db = new DbHelper(System.Configuration.ConfigurationManager.AppSettings["connstr"]);

  <appSettings>
    <add key="DbHelperProvider" value="System.Data.SqlClient"/>
   <add key="connstr" value="Data Source=(local);Initial Catalog=Demo;User ID=sa;Password=202063sb"/>
  </appSettings>

那么如何使用它呢?下面我给出一些基本的使用示例,基本能满足你大部分的数据库操作需要了.
)直接执行sql语句

        DbHelper db = new DbHelper();
        DbCommand cmd = db.GetSqlStringCommond("insert t1 (id)values(‘haha‘)");
        db.ExecuteNonQuery(cmd);

或者
         db.ExecuteNonQuery("insert t1 (id)values(‘haha‘)");

)执行存储过程

        DbHelper db = new DbHelper();
        DbCommand cmd = db.GetStoredProcCommond("t1_insert");
        db.AddInParameter(cmd, "@id", DbType.String, "heihei");
        db.ExecuteNonQuery(cmd);

)返回DataSet

        DbHelper db = new DbHelper();
        DbCommand cmd = db.GetSqlStringCommond("select * from t1");
        DataSet ds = db.ExecuteDataSet(cmd);

或者
         db.ExecuteNonQuery(sql);

)返回DataTable

        DbHelper db = new DbHelper();
        DbCommand cmd = db.GetSqlStringCommond("t1_findall");
        DataTable dt = db.ExecuteDataTable(cmd);

或者
          DataTable dt = db.ExecuteDataTable(sql);

)输入参数/输出参数/返回值的使用(比较重要哦)

        DbHelper db = new DbHelper();
        DbCommand cmd = db.GetStoredProcCommond("t2_insert");
        db.AddInParameter(cmd, "@timeticks", DbType.Int64, DateTime.Now.Ticks);
        db.AddOutParameter(cmd, );
        db.AddReturnParameter(cmd, "@returnValue", DbType.Int32);

        db.ExecuteNonQuery(cmd);

        string s = db.GetParameter(cmd, "@outString").Value as string;//out parameter
        int r = Convert.ToInt32(db.GetParameter(cmd, "@returnValue").Value);//return value

)DataReader使用

      DbHelper db = new DbHelper();
        DbCommand cmd = db.GetStoredProcCommond("t2_insert");
        db.AddInParameter(cmd, "@timeticks", DbType.Int64, DateTime.Now.Ticks);
        db.AddOutParameter(cmd, );
        db.AddReturnParameter(cmd, "@returnValue", DbType.Int32);

        using (DbDataReader reader = db.ExecuteReader(cmd))
        {
            dt.Load(reader);
        }
        string s = db.GetParameter(cmd, "@outString").Value as string;//out parameter
        int r = Convert.ToInt32(db.GetParameter(cmd, "@returnValue").Value);//return value

)事务的使用.(项目中需要将基本的数据库操作组合成一个完整的业务流时,代码级的事务是必不可少的哦)

以上我们好像没有指定数据库连接字符串,大家如果看下DbHelper的代码,就知道要使用它必须在config中配置两个参数,如下:

    pubic void DoBusiness()
    {
        using (Trans t = new Trans())
        {
            try
            {
                D1(t);
                throw new Exception();//如果有异常,会回滚滴
                D2(t);
                t.Commit();
            }
            catch
            {
                t.RollBack();
            }
        }
    }
    public void D1(Trans t)
    {
        DbHelper db = new DbHelper();
        DbCommand cmd = db.GetStoredProcCommond("t2_insert");
        db.AddInParameter(cmd, "@timeticks", DbType.Int64, DateTime.Now.Ticks);
        db.AddOutParameter(cmd, );
        db.AddReturnParameter(cmd, "@returnValue", DbType.Int32);

        if (t == null) db.ExecuteNonQuery(cmd);
        else db.ExecuteNonQuery(cmd,t);

        string s = db.GetParameter(cmd, "@outString").Value as string;//out parameter
        int r = Convert.ToInt32(db.GetParameter(cmd, "@returnValue").Value);//return value
    }
    public void D2(Trans t)
    {
        DbHelper db = new DbHelper();
        DbCommand cmd = db.GetSqlStringCommond("insert t1 (id)values(‘..‘)");
        if (t == null) db.ExecuteNonQuery(cmd);
        else db.ExecuteNonQuery(cmd, t);
    }

C# - Dbhelp的更多相关文章

  1. 带事物处理的DBHelp和sql语句

    DBHelp语句 using System; using System.Collections.Generic; using System.Linq; using System.Text; using ...

  2. C# Access DBHelp

    /* * By :落落 * URL: Www.MyLuoLuo.Com */ using System; using System.Collections.Generic; using System. ...

  3. DBHelp数据处理类

    using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.T ...

  4. 笔记8:winfrom连接数据库DBHelp

    using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.D ...

  5. SQLite DBHelp

    c#连接SQLite SQLite这个精巧的小数据库,无需安装软件,只需要一个System.Data.SQLite.DLL文件即可操作SQLite数据库.SQLite是一个开源数据库,现在已变得越来越 ...

  6. .Net下SQLite的DBHelp

    怎样获取SqLite请参考初识SqlLite ---.net连接数据库,怎样在SQLite使用Linq请参考在C#中利用Nuget包使用SQLite数据库和Linq to SQLite using S ...

  7. C#winfrom最简DBHelp(数据库连接操作)

    代码如下: //需引用命名空间 using System.Data; using System.Data.SqlClient; class DBHelper { //定义数据库连接语句,连接语句书写方 ...

  8. 平凡的KTV后台,不平凡的KTV数据

    之前就是说过“一个项目有很多重要的步骤以及功能”,那我们现在就来看看对于KTV项目来说:后台是处于什么样的重要作用! 首先就得了解KTV后台的一些功能了: 1.歌曲管理 .歌手管理 .设置资源路径 2 ...

  9. 欢迎进入MyKTV前后台点歌系统展示

    一个项目,一分收获:一个项目,一些资源.Ktv项目也是一样的,所以我想分享我的收获,让你们获得你需要的资源. 一. 那MyKTV点歌系统具体的功能有哪些呢?我们就来看看吧! 1.MyKTV前台功能: ...

随机推荐

  1. Delphi经验总结(2)

    Q: 怎么来改变ListBox的字体呢?就修改其中的一行. A: 先把ListBox1.Style 设成lbOwnerDrawFixed 然后在 OnDrawItem 事件下写下如下代码 proced ...

  2. Java for LeetCode 198 House Robber

    You are a professional robber planning to rob houses along a street. Each house has a certain amount ...

  3. [Android Pro] Android签名与认证详细分析之一(CERT.RSA剖析)

    转载自:http://www.thinksaas.cn/group/topic/335450/ 一.Android签名概述 我们已经知道的是:Android对每一个Apk文件都会进行签名,在Apk文件 ...

  4. css3学习总结8--CSS3 3D转换

    3D 转换 1. rotateX() 2. rotateY() otateX() 方法 通过 rotateX() 方法,元素围绕其 X 轴以给定的度数进行旋转. 示例: div { transform ...

  5. Java内部类的访问规则

    1.内部类可以直接访问外部类中的成员,包括私有      原因:因为在内部类中持有一个外部类的应用,格式:外部类.this class Outer {     private int x = 1; c ...

  6. javascript二叉树基本功能实现

    都是常用的功能. 删除是最复杂的.. <!DOCTYPE html> <html lang="en"> <head> <meta char ...

  7. Java Hour 17 来个CURD吧(二)

    有句名言,叫做10000小时成为某一个领域的专家.姑且不辩论这句话是否正确,让我们到达10000小时的时候再回头来看吧. 突然想到我最近一直在追的小说,作者每天都会更新两章,而且质量挺高.所以从这篇开 ...

  8. php 解决和避免form表单重复提交的方法

    在提交表单的时候,可能遇到网速等导致页面突然加载变慢,用户重复地点击提交按钮,将在数据库产生多条数据,导致不可控情况. 比如下面的情况就会导致表单重复提交: 点击提交按钮两次. 点击刷新按钮. 使用浏 ...

  9. Oracle 连接 Visual Studio 的工具

    Oracle 连接 Visual Studio 的工具 ① ② ③

  10. spark streaming中使用flume数据源

    有两种方式,一种是sparkstreaming中的driver起监听,flume来推数据:另一种是sparkstreaming按照时间策略轮训的向flume拉数据. 最开始我以为只有第一种方法,但是尼 ...