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- 导入mybatis所需要的依赖
<!-- 引入 myBatis,这是 MyBatis官方提供的适配 Spring Boot 的,而不是Spring Boot自己的-->
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>2.1.0</version>
</dependency>
2.配置数据库连接信息
spring.datasource.username=root
spring.datasource.password=123456
spring.datasource.url=jdbc:mysql://localhost:3306/mybatis?serverTimezone=UTC&useUnicode=true&characterEncoding=utf-8
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
这里使用默认的数据源,先去测试一下连接是否成功
@RunWith(SpringRunner.class)
@SpringBootTest
public class SpringbootDemoMybatisApplicationTests {
@Autowired
DataSource dataSource;
@Test
public void contextLoads() throws SQLException {
System.out.println("数据源>>>>>>" + dataSource.getClass());
Connection connection = dataSource.getConnection();
System.out.println("连接>>>>>>>>>" + connection);
System.out.println("连接地址>>>>>" + connection.getMetaData().getURL());
connection.close();
}
}
查看输出结果,数据库配置OK!
3,创建实体类
package com.chao.mybatis.pojo;
public class User {
private int id;
private String name;
private String pwd;
public User() {
}
public User(int id, String name, String pwd) {
this.id = id;
this.name = name;
this.pwd = pwd;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getPwd() {
return pwd;
}
public void setPwd(String pwd) {
this.pwd = pwd;
}
@Override
public String toString() {
return "User{" +
"id=" + id +
", name='" + name + '\'' +
", pwd='" + pwd + '\'' +
'}';
}
}
4.配置Mapper接口类
package com.chao.mybatis.pojo.mapper;
import com.chao.mybatis.pojo.User;
import org.apache.ibatis.annotations.Mapper;
import org.springframework.stereotype.Repository;
import java.util.List;
//@Mapper : 表示本类是一个 MyBatis 的 Mapper,等价于以前 Spring 整合 MyBatis 时的 Mapper 接口
@Mapper
@Repository
public interface UserMapper {
//选择全部用户
List<User> selectUser();
//根据id选择用户
User selectUserById(int id);
//添加一个用户
int addUser(User user);
//修改一个用户
int updateUser(User user);
//根据id删除用户
int deleteUser(int id);
}
5.Mapper映射文件
<?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.kuang.mybatis.pojo.mapper.UserMapper">
<select id="selectUser" resultType="User">
select * from user
</select>
<select id="selectUserById" resultType="User">
select * from user where id = #{id}
</select>
<insert id="addUser" parameterType="User">
insert into user (id,name,pwd) values (#{id},#{name},#{pwd})
</insert>
<update id="updateUser" parameterType="User">
update user set name=#{name},pwd=#{pwd} where id = #{id}
</update>
<delete id="deleteUser" parameterType="int">
delete from user where id = #{id}
</delete>
</mapper>
6.SpringBoot 整合!
以前 MyBatis 未与 spring 整合时,配置数据源、事务、连接数据库的账号、密码等都是在 myBatis 核心配置文件中进行的
myBatis 与 spring 整合后,配置数据源、事务、连接数据库的账号、密码等就交由 spring 管理。因此,在这里我们即使不使用mybatis配置文件也完全ok!
既然已经提供了 myBatis 的映射配置文件,自然要告诉 spring boot 这些文件的位置
#指定myBatis的核心配置文件与Mapper映射文件
mybatis.mapper-locations=classpath:mybatis/mapper/*.xml
# 注意:对应实体类的路径
mybatis.type-aliases-package=com.kuang.mybatis.pojo
已经说过 spring boot 官方并没有提供 myBaits 的启动器,是 myBatis 官方提供的开发包来适配的 spring boot,从 pom.xml 文件中的依赖包名也能看出来,并非是以 spring-boot 开头的;
同理上面全局配置文件中的这两行配置也是以 mybatis 开头 而非 spring 开头也充分说明这些都是 myBatis 官方提供的
可以从 org.mybatis.spring.boot.autoconfigure.MybatisProperties 中查看所有配置项
@ConfigurationProperties(
prefix = "mybatis"
)
public class MybatisProperties {
public static final String MYBATIS_PREFIX = "mybatis";
private static final ResourcePatternResolver resourceResolver = new PathMatchingResourcePatternResolver();
private String configLocation;
private String[] mapperLocations;
private String typeAliasesPackage;
private Class<?> typeAliasesSuperType;
private String typeHandlersPackage;
private boolean checkConfigLocation = false;
private ExecutorType executorType;
private Class<? extends LanguageDriver> defaultScriptingLanguageDriver;
private Properties configurationProperties;
@NestedConfigurationProperty
private Configuration configuration;
也可以直接去查看官方文档
http://www.mybatis.org/spring-boot-starter/mybatis-spring-boot-autoconfigure/
7.编写controller
package com.chao.mybatis.controller;
import com.chao.mybatis.pojo.User;
import com.kuang.mybatis.pojo.mapper.UserMapper;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;
import java.util.List;
@RestController
public class UserController {
@Autowired
private UserMapper userMapper;
//选择全部用户
@GetMapping("/selectUser")
public String selectUser(){
List<User> users = userMapper.selectUser();
for (User user : users) {
System.out.println(user);
}
return "ok";
}
//根据id选择用户
@GetMapping("/selectUserById")
public String selectUserById(){
User user = userMapper.selectUserById(1);
System.out.println(user);
return "ok";
}
//添加一个用户
@GetMapping("/addUser")
public String addUser(){
userMapper.addUser(new User(5,"阿毛","456789"));
return "ok";
}
//修改一个用户
@GetMapping("/updateUser")
public String updateUser(){
userMapper.updateUser(new User(5,"阿毛","421319"));
return "ok";
}
//根据id删除用户
@GetMapping("/deleteUser")
public String deleteUser(){
userMapper.deleteUser(5);
return "ok";
}
}
运行测试OK