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关于各种数据库 Insert时同时取到Id的操作_MySQL

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Release: 2016-06-01 13:12:01
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对数据库的操作,在Insert的同时获取到Id,保证原子性操作。而不是,先取Id,然后再插入到数据库等操作。

Oracle:

使用Oracle自带的 Returning into 语句,具体代码示例如下:

 1 sql = @"INSERT INTO KEYWORD(KEYWORD_ID,SITE_ID,KEYWORD_NAME,STATUS,SOURCE,CREATE_TIME,LAST_CHANGED) 2             VALUES 3             ( 4                 KEYWORD_SEQ.nextVal, 5                 :SITE_ID, 6                 :NAME, 7                 1, 8                 :Source, 9                 SYSDATE,10                 SYSDATE+0.000711             ) RETURNING KEYWORD_ID into :Key_ID";12 13 com.CommandText = sql;14 //com.Parameters.Add(new OracleParameter(":ID", OracleDbType.Int64, allKeyWords.Select(n => n.Keyword_Id).ToArray(), ParameterDirection.Input));15 com.Parameters.Add(new OracleParameter(":SITE_ID", OracleDbType.Int64, allKeyWords.Select(n => n.Site_Id).ToArray(), ParameterDirection.Input));16 com.Parameters.Add(new OracleParameter(":NAME", OracleDbType.NVarchar2, allKeyWords.Select(n => n.Keyword_Name).ToArray(), ParameterDirection.Input));17 com.Parameters.Add(new OracleParameter(":Source", OracleDbType.NVarchar2, allKeyWords.Select(n => n.Source).ToArray(), ParameterDirection.Input));18 var outputIdParm = new OracleParameter(":Key_ID", OracleDbType.Int32, ParameterDirection.Output);19 com.Parameters.Add(outputIdParm);20 21 com.ExecuteNonQuery();22 23 var allKeyWordIds = outputIdParm.Value as OracleDecimal[];
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 请注意上面代码中的 Returning 语句,以及最后参数的outPut。

 

SqlServer:使用SqlServer自带的  @@IDENTITY 关键字,具体代码示例如下:

1 var cmd = dbMenloFramework.CreateCommand("insert into syslog (Thread) values('test') SELECT @@IDENTITY AS Id");2             using(var read  = dbMenloFramework.ExecuteDataReader(cmd)){3                 read.Read();4                 Console.WriteLine(read[0].ToString());5             }
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MySql:   

暂时缺少,如有网友有可靠的方法,请在评论中联系我。

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