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