DbHelper数据库通用类使用方法

代码



    //执行SQL语句

    public static void ExecSqlCommand()

    {

        DbHelper db = new DbHelper();

        DbCommand command = db.GetSqlStringCommond("select * from t1_insert");

        db.ExecuteNonQuery(command);

    }



    //执行存储过程

    public static void ExecStoredProcedure()

    {

        DbHelper db = new DbHelper();

        DbCommand command = db.GetStoredProcCommond("t1_insert");

        db.AddInParameter(command, "@id", DbType.String, "heihei");

        db.AddInParameter(command, "@id", DbType.String, "heihei");

        db.ExecuteNonQuery(command);

    }



    //返回DataTable

    public static void GetDataTable()

    {

        DbHelper db = new DbHelper();

        DbCommand command = db.GetSqlStringCommond("t1_findall");

        DataTable dt = db.ExecuteDataTable(command);

    }



    //获取各种返回值

    public static void GetAllParameter()

    {

        DbHelper db = new DbHelper();

        DbCommand command = db.GetStoredProcCommond("t2_insert");



        db.AddInParameter(command, "@timeticks", DbType.Int64, DateTime.Now.Ticks);

        db.AddOutParameter(command, "@outString", DbType.String, 20);

        db.AddReturnParameter(command, "@returnValue", DbType.Int32);

        db.ExecuteNonQuery(command);



        string s = db.GetParameter(command, "@outString").Value as string;//out parameter

        int r = Convert.ToInt32(db.GetParameter(command, "@returnValue").Value);//return value

    }



    //DateReader操作

    public static void GetDataReader()

    {

        DbHelper db = new DbHelper();

        DbCommand command = db.GetStoredProcCommond("t2_insert");



        db.AddInParameter(command, "@timeticks", DbType.Int64, DateTime.Now.Ticks);

        db.AddOutParameter(command, "@outString", DbType.String, 20);

        db.AddReturnParameter(command, "@returnValue", DbType.Int32);



        using (DbDataReader reader = db.ExecuteReader(command))

        {

            //dt.Load(reader);

        }

        string s = db.GetParameter(command, "@outString").Value as string;//out parameter

        int r = Convert.ToInt32(db.GetParameter(command, "@returnValue").Value);//return value

    }

    

    //获取DataSet

    public static void GetDataSet()

    {

        DbHelper db = new DbHelper();

        DbCommand command = db.GetSqlStringCommond("select * from t1");

        DataSet ds = db.ExecuteDataSet(command);

    }



    //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)

    public 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, "@outString", DbType.String, 20);

        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);

    }

其中 DbCommand 位于 using System.Data.Common 命名空间