1 准备

1.1 引入依赖

<dependency>
	<groupId>org.mybatis.spring.boot</groupId>
	<artifactId>mybatis-spring-boot-starter</artifactId>
	<version>1.3.1</version>
</dependency>

<dependency>
	<groupId>mysql</groupId>
	<artifactId>mysql-connector-java</artifactId>
	<scope>runtime</scope>
</dependency>

<!--引入druid数据源-->
<dependency>
	<groupId>com.alibaba</groupId>
	<artifactId>druid</artifactId>
	<version>1.1.8</version>
</dependency>

1.2 用到的sql

/*
Navicat MySQL Data Transfer

Source Server         : Localhost:3306
Source Server Version : 50622
Source Host           : localhost:3306
Source Database       : mall

Target Server Type    : MYSQL
Target Server Version : 50622
File Encoding         : 65001

Date: 2018-12-10 15:29:06
*/

SET FOREIGN_KEY_CHECKS=0;

-- ----------------------------
-- Table structure for `m_cart`
-- ----------------------------
DROP TABLE IF EXISTS `m_cart`;
CREATE TABLE `m_cart` (
  `id` bigint(20) NOT NULL AUTO_INCREMENT COMMENT '自增ID',
  `user_id` bigint(20) DEFAULT NULL COMMENT '用户ID',
  `item_id` bigint(20) DEFAULT NULL COMMENT '商品ID',
  `item_title` varchar(100) DEFAULT NULL COMMENT '商品标题',
  `item_image` varchar(500) DEFAULT NULL COMMENT '商品主图',
  `item_price` bigint(20) DEFAULT NULL COMMENT '商品价格，单位为：分',
  `num` int(10) DEFAULT NULL COMMENT '购买数量',
  `create_time` bigint(14) DEFAULT NULL,
  `update_time` bigint(14) DEFAULT NULL,
  PRIMARY KEY (`id`),
  KEY `userId_itemId` (`user_id`,`item_id`) USING BTREE
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COMMENT='购物车模块';

-- ----------------------------
-- Records of m_cart
-- ----------------------------


/*
Navicat MySQL Data Transfer

Source Server         : Localhost:3306
Source Server Version : 50622
Source Host           : localhost:3306
Source Database       : mall

Target Server Type    : MYSQL
Target Server Version : 50622
File Encoding         : 65001

Date: 2018-12-11 10:37:58
*/

SET FOREIGN_KEY_CHECKS=0;

-- ----------------------------
-- Table structure for `m_item_param_template`
-- ----------------------------
DROP TABLE IF EXISTS `m_item_param_template`;
CREATE TABLE `m_item_param_template` (
  `id` bigint(20) NOT NULL AUTO_INCREMENT,
  `cat_id` bigint(20) NOT NULL COMMENT '商品类目ID',
  `param_data` text NOT NULL COMMENT '参数数据，格式为json格式',
  `create_time` bigint(14) NOT NULL COMMENT '创建时间',
  `update_time` bigint(14) NOT NULL COMMENT '修改时间',
  PRIMARY KEY (`id`),
  KEY `item_cat_id` (`cat_id`)
) ENGINE=InnoDB AUTO_INCREMENT=2 DEFAULT CHARSET=utf8 COMMENT='商品规则参数模板';

-- ----------------------------
-- Records of m_item_param_template
-- ----------------------------
INSERT INTO `m_item_param_template` VALUES ('1', '3', '[\n        {\n            \"group\": \"主体修改\",\n            \"params\": [\n                \"品牌\",\n                \"型号修改\",\n                \"入网型号修改\",\n                \"上市年份修改\"\n            ]\n        },\n        {\n            \"group\": \"基本信息\",\n            \"params\": [\n                \"机身颜色\",\n                \"机身长度（mm)\",\n                \"机身宽度（mm）\"\n            ]\n        }\n    ]', '20180927173853', '20180927173853');

2 注解版使用Mybatis

2.1 简单测试

• CartMapper

package com.gp6.springboot25.mapper;

import com.gp6.springboot25.bean.Cart;
import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Select;

@Mapper
public interface CartMapper {
    @Select("select * from m_cart where id = #{id}")
    public Cart selectCartById(int id);
}

• CartController

package com.gp6.springboot25.controller;

import com.gp6.springboot25.bean.Cart;
import com.gp6.springboot25.mapper.CartMapper;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class CartController {
    @Autowired
    CartMapper cartMapper;

    @GetMapping("/cart/{id}")
    public Cart selectCartById(@PathVariable("id") Integer id) {
        return cartMapper.selectCartById(id);
    }
}

2.2 http://localhost:8080/cart/1

• 未开启驼峰映射,userId与数据库中user_id不能对应

2.3 开启驼峰映射规则

package com.gp6.springboot25.config;


import org.apache.ibatis.session.Configuration;
import org.mybatis.spring.boot.autoconfigure.ConfigurationCustomizer;
import org.springframework.context.annotation.Bean;

@org.springframework.context.annotation.Configuration
public class MybatisConfig {

    @Bean
    public ConfigurationCustomizer configurationCustomizer() {
        return new ConfigurationCustomizer() {

            @Override
            public void customize(Configuration configuration) {
                // 开启驼峰命名法映射规则
                configuration.setMapUnderscoreToCamelCase(true);
            }
        };
    }
}

• 详见org.mybatis.spring.boot.autoconfigure.MybatisAutoConfiguration

3 配置版使用Mybatis

3.1 添加配置文件

<?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>

    <settings>
        <setting name="mapUnderscoreToCamelCase" value="true"/>
    </settings>
</configuration>

3.2 ItemParamTemplateMapper

package com.gp6.springboot25.mapper;

import com.gp6.springboot25.bean.ItemParamTemplate;

public interface ItemParamTemplateMapper {
    ItemParamTemplate selectItemParamTemplateById(int id);
}

3.3 ItemParamTemplateController

package com.gp6.springboot25.controller;

import com.gp6.springboot25.bean.ItemParamTemplate;
import com.gp6.springboot25.mapper.ItemParamTemplateMapper;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class ItemParamTemplateController {

    @Autowired
    ItemParamTemplateMapper itemParamTemplateMapper;

    @GetMapping("/itemParamTemplate/{id}")
    public ItemParamTemplate selectCartById(@PathVariable("id") Integer id) {
        return itemParamTemplateMapper.selectItemParamTemplateById(id);
    }
}

3.4 ItemParamTemplateMapper.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd" >
<mapper namespace="com.gp6.springboot25.mapper.ItemParamTemplateMapper">

    <resultMap id="BaseResultMap" type="com.gp6.springboot25.bean.ItemParamTemplate">
        <id column="id" property="id" jdbcType="BIGINT"/>
        <result column="cat_id" property="catId" jdbcType="BIGINT"/>
    </resultMap>

    <resultMap id="ResultMapWithBLOBs" type="com.gp6.springboot25.bean.ItemParamTemplate" extends="BaseResultMap">
        <result column="param_data" property="paramData" jdbcType="LONGVARCHAR"/>
    </resultMap>


    <select id="selectItemParamTemplateById" resultType="com.gp6.springboot25.bean.ItemParamTemplate">
        SELECT * FROM m_item_param_template WHERE id=#{id}
    </select>
</mapper>

3.5 application

mybatis.config-location=classpath:mybatis-config.xml
mybatis.mapper-locations=classpath:mapper/*.xml