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概述
現在互聯網應用中,大部分還是使用Mybatis來操作數據庫的,本文介紹一下Spring Boot中如何集成Mybatis。
上篇介紹了Spring Boot 直接用jar運行項目的方法，需要的朋友點擊查看。
創建Spring Boot工程
在 Spring Boot 開篇-創建和運行 一文中有一個小節介紹了如何使用Spring Boot的組件來創建工程。如果要集成Mybatis,只需要把Mysql和Mybatis這兩個組件勾選一下即可。
當然也可以不通過這種方式,直接在POM.xml文件中添加依賴也是可以的。我選擇的是直接在POM.xml文件中直接添加依賴這種方式。
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>
數據源使用阿里的druid。完整的POM.xml文件內容如下:
<?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>
創建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';
創建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 + '\'' +
'}';
}
}
創建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>
編寫application.properties
在Spring Boot為我們生成的application.properties文件中添加如下內容：
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
單元測試
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);
}
}
總結
以上所述是小編給大家介紹的Spring Boot集成Mybatis的實例代碼(簡潔版)，希望對大家有所幫助，如果大家有任何疑問請給我留言，小編會及時回復大家的。在此也非常感謝大家對億速云網站的支持！
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