项目架构
在SpringBoot项目的.pom文件引入MyBatis及数据库相关
<!-- Springboot-mybatis -->
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>1.3.0</version>
</dependency>
<!--数据库驱动-->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<scope>runtime</scope>
</dependency>
源码
CityController.java
package com.back.mybatis.controller;
import java.util.List;
import javax.annotation.Resource;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import com.back.mybatis.model.City;
import com.back.mybatis.service.CityService;
@RequestMapping("/city")
@RestController
public class CityController {
@Resource
private CityService cityService;
@GetMapping("list")
public List<City> listCity() {
return cityService.listCity();
}
}
CityService.java
package com.back.mybatis.service;
import java.util.List;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import com.back.mybatis.mapper.CityMapper;
import com.back.mybatis.model.City;
@Service
public class CityService {
@Autowired
private CityMapper cityMapper;
public List<City> listCity() {
return (List<City>) cityMapper.selelctList();
}
}
CityMapper.java
package com.back.mybatis.mapper;
import java.util.List;
import com.back.mybatis.model.City;
public interface CityMapper {
List<City> selelctList();
}
City.java
package com.back.mybatis.model;
public class City {
private Integer id;
private String cityName;
private String cityCode;
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getCityName() {
return cityName;
}
public void setCityName(String cityName) {
this.cityName = cityName == null ? null : cityName.trim();
}
public String getCityCode() {
return cityCode;
}
public void setCityCode(String cityCode) {
this.cityCode = cityCode == null ? null : cityCode.trim();
}
}
MyBatisApplication.java
package com.back.mybatis;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
@MapperScan("com.back.mybatis.mapper")//开启Mybatis扫描Dao
public class MyBatisApplication {
public static void main(String[] args) {
SpringApplication.run(MyBatisApplication.class, args);
}
}
CityMapper.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.back.mybatis.mapper.CityMapper"> <!-- 命名空间映射至相应的Dao -->
<resultMap id="BaseResultMap" type="com.back.mybatis.model.City"><!-- 表字段与模型字段映射 -->
<id column="Id" jdbcType="INTEGER" property="id" />
<result column="city_name" jdbcType="VARCHAR" property="cityName" />
<result column="city_code" jdbcType="VARCHAR" property="cityCode" />
</resultMap>
<select id="selelctList" resultMap="BaseResultMap">
select * from city
</select>
</mapper>
application.properties
#模板页面资源
spring.thymeleaf.prefix=classpath:/templates/
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
spring.datasource.url=jdbc:mysql://localhost:3306/network?characterEncoding=utf8&zeroDateTimeBehavior=convertToNull&serverTimezone=UTC
spring.datasource.username=root
spring.datasource.password=root
#mapping文件位置。注意classpath:后面不要带空格!!!
mybatis.mapper-locations= classpath:mapping/*.xml
#模型类包
mybatis.type-aliases-package= com.back.mybatis.model
注意事项
1、mapping文件夹建在src/main/resources下。这样就不用再插件里配置mapping。
2、建议用MyBatis生成器,生成表对应的model、mapping、Dao。减少手工配置的失误。
附:生成器配置
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE generatorConfiguration
PUBLIC "-//mybatis.org//DTD MyBatis Generator Configuration 1.0//EN"
"http://mybatis.org/dtd/mybatis-generator-config_1_0.dtd">
<generatorConfiguration>
<!-- 数据库驱动:选择你的本地硬盘上面的数据库驱动包-->
<classPathEntry location="C:\Users\Back\.m2\repository\mysql\mysql-connector-java\5.1.46\mysql-connector-java-5.1.46.jar"/>
<context id="DB2Tables" targetRuntime="MyBatis3">
<commentGenerator>
<property name="suppressDate" value="true"/>
<!-- 是否去除自动生成的注释 true:是 : false:否 -->
<property name="suppressAllComments" value="true"/>
</commentGenerator>
<jdbcConnection driverClass="com.mysql.cj.jdbc.Driver" connectionURL="jdbc:mysql://localhost:3306/network?serverTimezone=UTC" userId="root" password="root">
</jdbcConnection>
<javaTypeResolver>
<property name="forceBigDecimals" value="false"/>
</javaTypeResolver>
<!-- 生成模型的包名和位置-->
<javaModelGenerator targetPackage="com.back.mybatis.model" targetProject="MyBatis/src/main/java">
<property name="enableSubPackages" value="true"/>
<property name="trimStrings" value="true"/>
</javaModelGenerator>
<!-- 生成映射文件的包名和位置-->
<sqlMapGenerator targetPackage="mapping" targetProject="MyBatis/src/main/resources">
<property name="enableSubPackages" value="true"/>
</sqlMapGenerator>
<!-- 生成DAO的包名和位置-->
<javaClientGenerator type="XMLMAPPER" targetPackage="com.back.mybatis.mapper" targetProject="MyBatis/src/main/java">
<property name="enableSubPackages" value="true"/>
</javaClientGenerator>
<!-- 要生成的表 tableName是数据库中的表名或视图名 domainObjectName是实体类名-->
<table tableName="city" domainObjectName="City" enableCountByExample="false" enableUpdateByExample="false" enableDeleteByExample="false" enableSelectByExample="false" selectByExampleQueryId="false"></table>
</context>
</generatorConfiguration>
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