分享 .NET(C#,VB.NET,ADO.NET)中取自增字段值的方法 SCOPE_IDENTITY()

本文链接：https://blog.youkuaiyun.com/liuruxin/article/details/4639723

本文详细解析了一个构造函数的实现细节，该构造函数用于初始化一个记录集，并根据不同的操作类型（如插入）动态调整SQL语句。文章还介绍了如何在插入操作中使用输出参数获取新插入记录的ID。

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        /// <summary>
        /// 構造函數
        /// </summary>
        /// <param name="LRServerData">ServerData 對象</param>
        /// <param name="SQL">SQL語句</param>
        /// <param name="OptionType">如何操作</param>
        /// <param name="TableName">Table 別名</param>
        internal APRecordSet(ServerData LRServerData, string SQL, tagUpdateMode OptionType, string TableName)
        {
            string mySQL = SQL;
            if (SQL.IndexOf(' ') < 0)
            {
                if (OptionType == tagUpdateMode.RT_Insert)
                    mySQL = "select * from " + mySQL + " where 1=0 ";
                else
                    mySQL = "select * from " + mySQL;
            }
            Lrs = LRServerData;
            _ICursor = Lrs._DBConnection.OpenDataTableForUpdate(mySQL, out myDataAdapter, TableName);
            myDataAdapter.RowUpdated += new SqlRowUpdatedEventHandler(myDataAdapter_RowUpdated);
            myDataAdapter.RowUpdating += new SqlRowUpdatingEventHandler(myDataAdapter_RowUpdating);
            _UserName = Lrs.UserName;
            mEditMode = tagUpdateMode.RT_Browse;
        }

        private void myDataAdapter_RowUpdating(object sender, SqlRowUpdatingEventArgs e)
        {
            if (e.StatementType == StatementType.Insert)
            {
                SqlParameter myParamenter = new SqlParameter("@getuid", SqlDbType.Int);
                myParamenter.Direction = ParameterDirection.Output;
                e.Command.Parameters.Add(myParamenter);
                e.Command.CommandText += ";select @getuid = SCOPE_IDENTITY()";
            }
        }

        private void myDataAdapter_RowUpdated(object sender, SqlRowUpdatedEventArgs e)
        {
            if (e.StatementType == StatementType.Insert)
            {
                e.Row["uid"] = e.Command.Parameters["@getuid"].Value;
            }
        }

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