概述
现在互联网应用中,大部分还是使用Mybatis来操作数据库的,本文介绍一下Spring Boot中如何集成Mybatis。
上篇介绍了Spring Boot 直接用jar运行项目的方法，需要的朋友点击查看。
创建Spring Boot工程
在 Spring Boot 开篇-创建和运行 一文中有一个小节介绍了如何使用Spring Boot的组件来创建工程。如果要集成Mybatis,只需要把Mysql和Mybatis这两个组件勾选一下即可。
当然也可以不通过这种方式,直接在POM.xml文件中添加依赖也是可以的。我选择的是直接在POM.xml文件中直接添加依赖这种方式。
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> <version>5.1.34</version> </dependency> <dependency> <groupId>com.alibaba</groupId> <artifactId>druid</artifactId> <version>1.1.7</version> </dependency>
数据源使用阿里的druid。完整的POM.xml文件内容如下:
<?xml version="1.0" encoding="UTF-8"?> <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>com.springboot</groupId> <artifactId>study</artifactId> <version>0.0.1-SNAPSHOT</version> <packaging>jar</packaging> <name>study</name> <description>Demo project for Spring Boot</description> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>1.5.10.RELEASE</version> <relativePath/> <!-- lookup parent from repository --> </parent> <properties> <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding> <java.version>1.8</java.version> </properties> <dependencies> <dependency> <groupId>org.mybatis.spring.boot</groupId> <artifactId>mybatis-spring-boot-starter</artifactId> <version>1.3.1</version> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>5.1.34</version> </dependency> <dependency> <groupId>com.alibaba</groupId> <artifactId>druid</artifactId> <version>1.1.7</version> </dependency> <dependency> <groupId>com.alibaba</groupId> <artifactId>fastjson</artifactId> <version>1.2.45</version> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> </dependency> </dependencies> <build> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> </plugin> </plugins> </build> </project>
创建table
CREATE TABLE `user` ( `id` bigint(20) NOT NULL AUTO_INCREMENT, `name` varchar(30) NOT NULL DEFAULT '', PRIMARY KEY (`id`) ) ENGINE=InnoDB AUTO_INCREMENT=8 DEFAULT CHARSET=utf8 COMMENT='user信息';
创建entity
package com.springboot.entity;
public class User {
private Long id;
private String name;
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
@Override
public String toString() {
return "User{" +
"id=" + id +
", name='" + name + '\'' +
'}';
}
}
创建Mybatis映射文件和repo
UserRepo.java
package com.springboot.repo;
import com.springboot.entity.User;
import org.apache.ibatis.annotations.Mapper;
import org.springframework.stereotype.Component;
import java.util.List;
@Component
@Mapper
public interface UserRepo {
int insert(User user);
User selectByPrimaryKey(Long id);
int updateByPrimaryKey(User user);
int deleteByPrimaryKey(Long id);
List<User> selectAll();
}
UserMapper.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.springboot.repo.UserRepo" >
<resultMap id="BaseResultMap" type="com.springboot.entity.User" >
<id column="id" property="id" jdbcType="BIGINT" />
<result column="name" property="name" jdbcType="VARCHAR" />
</resultMap>
<sql id="Base_Column_List" >
id,
name
</sql>
<select id="selectByPrimaryKey" resultMap="BaseResultMap" parameterType="java.lang.Long" >
select
<include refid="Base_Column_List" />
from user
where id = #{id,jdbcType=BIGINT}
</select>
<select id="selectAll" resultMap="BaseResultMap">
select
<include refid="Base_Column_List" />
from user
</select>
<update id="updateByPrimaryKey" parameterType="com.springboot.entity.User" >
update user
<set>
<if test="name != null" >
`name`= #{name,jdbcType=VARCHAR},
</if>
</set>
where id = #{id,jdbcType=BIGINT}
</update>
<delete id="deleteByPrimaryKey" parameterType="java.lang.Long" >
delete from user
where id = #{id,jdbcType=BIGINT}
</delete>
<insert id="insert" parameterType="com.springboot.entity.User" useGeneratedKeys="true" keyProperty="id">
insert into user
<trim prefix="(" suffix=")" suffixOverrides="," >
name
</trim>
<trim prefix="values (" suffix=")" suffixOverrides="," >
#{name,jdbcType=VARCHAR}
</trim>
</insert>
</mapper>
编写application.properties
在Spring Boot为我们生成的application.properties文件中添加如下内容：
spring.datasource.name=spring_boot_study spring.datasource.url=jdbc:mysql://localhost:3306/test spring.datasource.username=root spring.datasource.password=xxxxxx spring.datasource.driver-class-name=com.mysql.jdbc.Driver spring.datasource.type=com.alibaba.druid.pool.DruidDataSource mybatis.mapper-locations=classpath:mapper/*.xml mybatis.type-aliases-package=com.springboot.entity
单元测试
package com.springboot;
import com.springboot.entity.User;
import com.springboot.repo.UserRepo;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;
import java.util.List;
@RunWith(SpringRunner.class)
@SpringBootTest
public class UserTest {
@Autowired
private UserRepo userRepo;
@Test
public void testInsert() {
User user = new User();
user.setName("test2");
userRepo.insert(user);
}
@Test
public void testUpdate() {
User user = new User();
user.setId(6L);
user.setName("test3");
userRepo.updateByPrimaryKey(user);
}
@Test
public void testDelete() {
userRepo.deleteByPrimaryKey(6L);
}
@Test
public void testSelectByPrimaryKey() {
User user = userRepo.selectByPrimaryKey(7L);
System.out.println(user);
}
@Test
public void testSelectAll() {
List<User> userList = userRepo.selectAll();
System.out.println(userList);
}
}
总结
以上所述是小编给大家介绍的Spring Boot集成Mybatis的实例代码(简洁版)，希望对大家有所帮助，如果大家有任何疑问请给我留言，小编会及时回复大家的。在此也非常感谢大家对网站的支持！
