mybatis.net insert 返回主键

mybatis insert语句

<insert id="Add" parameterClass="UserInfo" resultClass="int">
  INSERT INTO UserInfo(UserName,Password,NickName) VALUES (#UserName#,#Password#,#NickName#)
</insert>

这样无法获取到插入记录的ID，如果想要获取的ID，需要用到selectKey，同时需要注意到，有些数据库支持自动增长如 （mssql和mysql）,但是有些数据库(如oracle)不支持自动增长

MSSQL

<insert id="Add" parameterClass="UserInfo" resultClass="int">
  INSERT INTO UserInfo(UserName,Password,NickName) VALUES (#UserName#,#Password#,#NickName#)
  <selectKey  type="post" property="Id" resultClass="int">
    SELECT @@Identity as value
  </selectKey>
</insert>

MYSQL

<insert id="Add" parameterClass="UserInfo" resultClass="int">
  INSERT INTO UserInfo(UserName,Password,NickName) VALUES (#UserName#,#Password#,#NickName#)
  <selectKey  type="post" property="Id" resultClass="int">
    SELECT LAST_INSERT_ID()  as value
  </selectKey>
</insert>

ORACLE

<insert id="Add" parameterClass="UserInfo">
  <selectKey resultClass="int" type="pre" property="Id" >
    SELECT STOCKIDSEQUENCE.NEXTVAL AS VALUE FROM DUAL
  </selectKey>
  INSERT INTO UserInfo(id,UserName,Password,NickName) VALUES (#id#,#UserName#,#Password#,#NickName#)
</insert>