Mybatis插入数据并返回主键值：

<insert id="insert" parameterType="com.pojo.TSubject" useGeneratedKeys="true" keyProperty="oid" >

insert into t_subject ( parentid, subjectname, subjecttype, subjectitem, subjectanser, displaytype) values ( #{parentid,jdbcType=INTEGER}, #{subjectname,jdbcType=VARCHAR}, #{subjecttype,jdbcType=VARCHAR}, #{subjectitem,jdbcType=VARCHAR}, #{subjectanser,jdbcType=VARCHAR}, #{displaytype,jdbcType=VARCHAR})

</insert>

添加以下两句话：

useGeneratedKeys="true" keyProperty="oid"

“oid”表主键

subjectService.insert(tSubject);

插入成功后：tSubject..getSubjectid() 就可以得到刚刚插入记录主键id