springboot集成mybatis（含xml）
1.新建一个springboot项目，项目结构如下
2.pom.xml,自己看
<?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.java</groupId> <artifactId>springbootmybatis02</artifactId> <version>0.0.1-SNAPSHOT</version> <packaging>jar</packaging> <name>springbootmybatis02</name> <description>Demo project for Spring Boot</description> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>2.0.3.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>1.3.2</version> </dependency> <!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-starter-web --> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> <version>2.0.3.RELEASE</version> </dependency> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <scope>runtime</scope> </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>
3.配置application.yml
spring:
datasource:
driver-class-name: com.mysql.jdbc.Driver
url: jdbc:mysql://localhost:3306/db_mybatis
username: root
password: root
mybatis:
config-location: classpath:mybatis/mybatis-config.xml
mapper-locations: classpath:mybatis/mapper/*.xml
4.新建模型类User.java
/** * Copyright (C), 2015-2018, XXX有限公司 * FileName: User * Author: adm * Date: 2018/7/6 14:05 * Description: * History: * <author> <time> <version> <desc> * 作者姓名 修改时间 版本号 描述 */ package com.java.model; /** * 〈一句话功能简述〉<br> * 〈〉 * * @author adm * @create 2018/7/6 * @since 1.0.0 */ public class User { private int id; private String name; public User(int id, String name) { this.id = id; this.name = name; } public User() { super(); } 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; } @Override public String toString() { return "User{" + "id=" + id + ", name='" + name + '\'' + '}'; } }
5.编写映射类UserMapper.java
package com.java.mapper; import com.java.model.User; import org.apache.ibatis.annotations.Mapper; import org.springframework.core.annotation.Order; import java.util.List; @Mapper public interface UserMapper { void addUser(User user); void updateUser(User user); void deleteUser(int id); User queryUserById(Integer id); List<User> queryUsers(); }
6.mybatis主配置文件，这里typeAlias只是为了后面使用某个类路径更简洁，可有可无
<?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> <typeAliases> <typeAlias alias="Integer" type="java.lang.Integer" /> <typeAlias alias="Long" type="java.lang.Long" /> <typeAlias alias="HashMap" type="java.util.HashMap" /> <typeAlias alias="LinkedHashMap" type="java.util.LinkedHashMap" /> <typeAlias alias="ArrayList" type="java.util.ArrayList" /> <typeAlias alias="LinkedList" type="java.util.LinkedList" /> <package name="com.java.model"/> </typeAliases> </configuration>
7.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.java.mapper.UserMapper" > <insert id="addUser" parameterType="com.java.model.User" > INSERT INTO t_user (id,name) VALUES (#{id}, #{name}) </insert> <update id="updateUser" parameterType="com.java.model.User" > UPDATE t_user SET name=#{name} WHERE id=#{id} </update> <delete id="deleteUser" parameterType="Integer" > DELETE FROM t_user WHERE id =#{id} </delete> <select id="queryUserById" parameterType="Integer" resultType="user" > SELECT * FROM t_user WHERE id = #{id} </select> <select id="queryUsers" resultType="user" > SELECT * FROM t_user </select> </mapper>
重点提一下，select中的resultType，查询结果是一个键值形式，表列属性为键，内容为值，resultType中value为类路径，返回结果集中的键值与该类属性一一映射，所以要保持数据库表的列名与模型中的属性名一致，当然还可以用resultMap，resultMap就是保证数据库表列名和模型属性名保持一致，下面是网上内容，应该能看懂
好了，又写完了，接下来写测试
8.测试
package com.java; import com.java.mapper.UserMapper; import com.java.model.User; import org.junit.Test; import org.junit.runner.RunWith; import org.springframework.boot.test.context.SpringBootTest; import org.springframework.test.context.junit4.SpringRunner; import javax.annotation.Resource; import java.util.List; @RunWith(SpringRunner.class) @SpringBootTest public class Springbootmybatis02ApplicationTests { @Resource private UserMapper userMapper; @Test public void test01_addUser() { User user=new User(11,"guocheng1"); userMapper.addUser(user); } @Test public void test02_updateUser(){ User user=new User(11,"guocheng2"); userMapper.updateUser(user); } @Test public void test03_deleteUser(){ userMapper.deleteUser(1); } @Test public void test04_queryUserById(){ User user = userMapper.queryUserById(3); System.out.println(user); } @Test public void test05_queryUsers(){ List<User> users = userMapper.queryUsers(); for (User resultUser:users ) { System.out.println(resultUser); } } }
数据库表
执行test04，结果如下
好了剩下的自己测试吧，
