Mybatis设置主键自增

<insert id="insertArea" useGeneratedKeys="true" keyProperty="areaId"
        keyColumn="area_id">
        INSERT INTO
        tb_area(area_name,area_desc,priority,
        create_time,last_edit_time)
        VALUES
        (#{areaName},#{areaDesc},#{priority},
        #{createTime},#{lastEditTime})
    </insert>

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE configuration
  PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
  "http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
    <!-- 配置全局属性 -->
    <settings>
        <!-- 使用jdbc的getGeneratedKeys获取数据库自增主键值 -->
        <setting name="useGeneratedKeys" value="true" />

        <!-- 使用列标签替换列别名 默认:true -->
        <setting name="useColumnLabel" value="true" />

        <!-- 开启驼峰命名转换:Table{create_time} -> Entity{createTime} -->
        <setting name="mapUnderscoreToCamelCase" value="true" />
    </settings>
    <plugins>
        <plugin interceptor="com.imooc.o2o.dao.split.DynamicDataSourceInterceptor">
        </plugin>
    </plugins>
</configuration>

mybatis-config