SELECT LAST_INSERT_ID()              
                     insert into user(username,birthday,sex,address) value(#{username},#{birthday},#{sex},#{address})          
            
            
               
                    
                     
       
                          SELECT uuid()              
                     insert into user(id,username,birthday,sex,address) value(#{id}.#{username},#{birthday},#{sex},#{address})          
            
        oracle主键返回

     	
      
       		SELECT 序列名.nextval() FROM DUAL;	
      	insert into user(id,username,birthday,sex,address) value(#{id},#{username},#{birthday},#{sex},#{address})  
     

mysql 主键返回值

 

（1）主键返回之自增主键

 

 

（2）主键返回值UUID

UUID函数是mysql的函数

 

 

Oracle主键返回值

（1）序列也就是sequence，它是Oracle的主键生成策略

 

 （2）

<insert id="insert" parameterType="com.xxx.SystemDepartment">

    <selectKey keyProperty="id" resultType="String" order="BEFORE">

        select sys_guid() from dual

    </selectKey>

    insert into SYSTEM_DEPARTMENT (ID,DEPNAME, SUPERID, SORT, STATE)

    values ( #{id,jdbcType=VARCHAR},#{depname,jdbcType=VARCHAR},

    #{superid,jdbcType=DECIMAL}, #{sort,jdbcType=DECIMAL},

    #{state,jdbcType=DECIMAL})

</insert>