mybatis插入的同时获取主键id

<insert id="insertAndReturnId" parameterType="com.qianlong.cms.entity.AppCmsRole"
        useGeneratedKeys="true" keyProperty="id">
        insert into app_cms_role
        <trim prefix="(" suffix=")" suffixOverrides=",">
            <if test="name != null">
                name,
            </if>
            <if test="createTime != null">
                create_time,
            </if>
            <if test="updateTime != null">
                update_time,
            </if>
            <if test="appId != null">
                app_id,
            </if>
            <if test="roleName != null">
                role_name,
            </if>
            <if test="rolePrivilege != null">
                role_privilege,
            </if>
        </trim>
        <trim prefix="values (" suffix=")" suffixOverrides=",">
            <if test="name != null">
                #{name,jdbcType=VARCHAR},
            </if>
            <if test="createTime != null">
                #{createTime,jdbcType=TIMESTAMP},
            </if>
            <if test="updateTime != null">
                #{updateTime,jdbcType=TIMESTAMP},
            </if>
            <if test="appId != null">
                #{appId,jdbcType=INTEGER},
            </if>
            <if test="roleName != null">
                #{roleName,jdbcType=VARCHAR},
            </if>
            <if test="rolePrivilege != null">
                #{rolePrivilege,jdbcType=VARCHAR},
            </if>
        </trim>
    </insert>

需求：使用MyBatis往MySQL数据库中插入一条记录后，需要返回该条记录的自增主键值。

方法：在mapper中指定keyProperty属性，示例如上：

AppCmsRole role=new AppCmsRole();
appCmsRoleExMapper.insertAndReturnId(role);
role.getId();//就能获取到id了,很神奇吧