Spring Boot MyBatis

MyBatis简介

MyBatis 本是apache的一个开源项目iBatis, 2010年这个项目由apache 迁移到了google code，并且改名为MyBatis 。

集成spring boot 的时候必须在mapper接口上面标注@Mapper注解

项目图片

在这里插入图片描述

pom.xml

只需要在pom.xml引入需要的数据库配置，就会自动访问此数据库，如果需要配置其他数据库，可以在application.properties进行添加

默认使用org.apache.tomcat.jdbc.pool.DataSource创建连接池

<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.jege.spring.boot</groupId><artifactId>spring-boot-mybatis</artifactId><version>0.0.1-SNAPSHOT</version><packaging>jar</packaging><name>spring-boot-mybatis</name><url>http://maven.apache.org</url><!-- 公共spring-boot配置，下面依赖jar文件不用在写版本号 --><parent><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-parent</artifactId><version>1.4.1.RELEASE</version><relativePath /></parent><properties><project.build.sourceEncoding>UTF-8</project.build.sourceEncoding><java.version>1.8</java.version></properties><dependencies><!-- 持久层 --><dependency><groupId>org.mybatis.spring.boot</groupId><artifactId>mybatis-spring-boot-starter</artifactId><version>1.1.1</version></dependency><!-- h2内存数据库 --><dependency><groupId>com.h2database</groupId><artifactId>h2</artifactId><scope>runtime</scope></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-test</artifactId><scope>test</scope></dependency></dependencies><build><finalName>spring-boot-mybatis</finalName><plugins><plugin><groupId>org.apache.maven.plugins</groupId><artifactId>maven-compiler-plugin</artifactId><configuration><source>${java.version}</source><target>${java.version}</target></configuration></plugin></plugins></build>
</project>

模型对象User

package com.jege.spring.boot.mybatis.entity;/*** 模型对象*/
public class User {private Long id;private String name;private Integer age;public User() {}public User(String name, Integer age) {this.name = name;this.age = age;}
}

持久层UserMapper

package com.jege.spring.boot.mybatis.mapper;import java.util.List;import org.apache.ibatis.annotations.Delete;
import org.apache.ibatis.annotations.Insert;
import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Select;import com.jege.spring.boot.mybatis.entity.User;/*** 持久层接口，由spring自动生成其实现*/
@Mapper
public interface UserMapper {@Delete("drop table t_user if exists")void dropTable();@Insert("create table t_user (id bigint generated by default as identity, age integer, name varchar(255), primary key (id))")void createTable();@Insert("insert into t_user(name,age) values(#{name},#{age})")void insert(User user);@Select("select id,name,age from t_user")List<User> findAll();@Select("select id,name,age from t_user where name like #{name}")List<User> findByNameLike(String name);@Delete("delete from t_user")void deleteAll();}

无需application.properties

测试类UserMapperTest

package com.jege.spring.boot.mybatis;import static org.assertj.core.api.Assertions.assertThat;import org.junit.After;
import org.junit.Before;
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.SpringJUnit4ClassRunner;import com.jege.spring.boot.mybatis.entity.User;
import com.jege.spring.boot.mybatis.mapper.UserMapper;@RunWith(SpringJUnit4ClassRunner.class)
@SpringBootTest()
public class UserMapperTest {@AutowiredUserMapper userMapper;// 每次执行Test之前先删除表，创建表@Beforepublic void before() throws Exception {userMapper.dropTable();userMapper.createTable();}// 打印出class com.sun.proxy.$Proxy66表示spring注入通过jdk动态代理获取接口的子类@Testpublic void proxy() throws Exception {System.out.println(userMapper.getClass());}@Testpublic void save() throws Exception {for (int i = 0; i < 10; i++) {User user = new User("jege" + i, 25 + i);userMapper.insert(user);}}@Testpublic void all() throws Exception {save();assertThat(userMapper.findAll()).hasSize(10);}@Testpublic void findByName() throws Exception {save();assertThat(userMapper.findByNameLike("jege%")).hasSize(10);}// 每次执行Test之后清空数据@Afterpublic void destroy() throws Exception {userMapper.deleteAll();}}