Mybatis 返回主键

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<insert id="insert" parameterType="com.patest.entiy.UserInfo"        useGeneratedKeys="true" keyProperty="userId">        insert into user_info (user_id,        usrpf_id, username,        password, classroom, is_teacher,        is_admin,        is_active, last_login,        add_time)        values (#{userId,jdbcType=INTEGER},        #{usrpfId,jdbcType=INTEGER},        #{username,jdbcType=VARCHAR},        #{password,jdbcType=VARCHAR}, #{classroom,jdbcType=VARCHAR},        #{isTeacher,jdbcType=INTEGER},        #{isAdmin,jdbcType=INTEGER},        #{isActive,jdbcType=INTEGER},        #{lastLogin,jdbcType=TIMESTAMP},        #{addTime,jdbcType=TIMESTAMP})</insert>

@Test    public void test_insertUserInfo() throws Exception {//      List<UserInfo> data=new ArrayList<UserInfo>();//      data.add(new UserInfo(1, "hsah", "sajdhk", "das", 1, 1, 1,//              Calendar.getInstance().getTime(), Calendar.getInstance().getTime()));        System.out.println(testObj.insert(new UserInfo(1, "hds1231assah", "sajdhk", "das", 1, 1, 1,                Calendar.getInstance().getTime(), Calendar.getInstance().getTime())));    }

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