Springboot整合Mybatis完整案例
1.新建springboot项目，添加mybatis的依赖。
pom.xml文件如下：
<?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.example</groupId>
<artifactId>Springboot-mybatis</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging><name>Springboot-mybatis</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.springframework.boot</groupId>
<artifactId>spring-boot-starter-thymeleaf</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>1.3.2</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>
项目结构如下：
其中dao包下的XXXMapper.java和XXXMapper.xml文件和domain包下的实体类通过Mybatis Generator插件自动生成（需要添加quotatarget_generator (1).xml文件）。
quotatarget_generator (1).xml文件如下：
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE generatorConfiguration
PUBLIC "-//mybatis.org//DTD MyBatis Generator Configuration 1.0//EN"
"http://mybatis.org/dtd/mybatis-generator-config_1_0.dtd">
<generatorConfiguration>
<!--数据库驱动-->
<!-- <classPathEntry location="mysql-connector-java-5.1.31.jar"/> -->
<context id="DB2Tables" targetRuntime="MyBatis3">
<commentGenerator>
<property name="suppressDate" value="true"/>
<property name="suppressAllComments" value="true"/>
</commentGenerator>
<!--数据库链接地址账号密码-->
<jdbcConnection driverClass="com.mysql.jdbc.Driver" connectionURL="jdbc:mysql://localhost:3306/bsol" userId="root" password="Root">
</jdbcConnection>
<javaTypeResolver>
<property name="forceBigDecimals" value="false"/>
</javaTypeResolver>
<!--生成Model类存放位置-->
<javaModelGenerator targetPackage="com.example.domain" targetProject="Springboot-mybatis/src/main/java">
<property name="enableSubPackages" value="true"/>
<property name="trimStrings" value="true"/>
</javaModelGenerator>
<!--生成映射文件存放位置-->
<sqlMapGenerator targetPackage="com.example.dao" targetProject="Springboot-mybatis/src/main/java">
<property name="enableSubPackages" value="true"/>
</sqlMapGenerator>
<!--生成Dao类存放位置-->
<javaClientGenerator type="XMLMAPPER" targetPackage="com.example.dao" targetProject="Springboot-mybatis/src/main/java">
<property name="enableSubPackages" value="true"/>
</javaClientGenerator>
<!--生成对应表及类名-->
<table tableName="user" domainObjectName="User" enableCountByExample="true" enableUpdateByExample="true" enableDeleteByExample="true" enableSelectByExample="true" selectByExampleQueryId="true"></table>
<table tableName="book" domainObjectName="Book" enableCountByExample="true" enableUpdateByExample="true" enableDeleteByExample="true" enableSelectByExample="true" selectByExampleQueryId="true"></table>
<table tableName="order" domainObjectName="Order" enableCountByExample="true" enableUpdateByExample="true" enableDeleteByExample="true" enableSelectByExample="true" selectByExampleQueryId="true"></table>
</context>
</generatorConfiguration>
2.配置application.properties文件。
mybatis.config-locations=classpath:mybatis/mybatis-config.xml #mybatis的配置文件
mybatis.mapper-locations=classpath:dao/*.xml #classpath 路径下 dao包下，* 代表会扫描所有 xml 文件
mybatis.type-aliases-package=com.example.domain #指向实体类包路径spring.datasource.driverClassName = com.mysql.jdbc.Driver
spring.datasource.url = jdbc:mysql://localhost:3306/bsol?useUnicode=true&characterEncoding=utf-8
spring.datasource.username = root
spring.datasource.password = Root
3.在src/test/java目录下编写测试代码。
package com.example.demo;
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 com.example.dao.BookMapper;
import com.example.dao.UserMapper;
import com.example.domain.Book;
import com.example.domain.User;@RunWith(SpringRunner.class)
@SpringBootTest
public class SpringbootMybatisApplicationTests {@Autowired
private BookMapper bookMapper;
@Autowired
private UserMapper userMapper;
@Test
public void contextLoads() {
Book book=bookMapper.selectByPrimaryKey(1);
User user=userMapper.selectByPrimaryKey(1);
System.out.println(user.getUsername()+" "+user.getPassword());
System.out.println(book.getBookname()+" "+book.getInformation());
}}
4.运行测试。