今天我们在springboot上集成mybatis。首先创建一个maven项目。
添加依赖
<!--springboot依赖-->
<dependency>
<groupId>org.springframework.boot<groupI>
<artifactId>springbootstarter<artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<!--测试-->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<!--集成Mybatis-->
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter<artifactId>
<version>1.3.0</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.35</version>
</dependency>在src/main/resources/目录下新建一个application.properties配置文件，里面写数据源的配置
spring.datasource.name=test
spring.datasource.url=jdbc:mysql://127.0.0.1:3306/test
spring.datasource.username=root
spring.datasource.password=root配置文件有两种写法，我们还可以写成yml文件形式，在src/main/resources/目录下新建一个application.yml文件（两种方式选其中一种就可以了）
spring:
datasource:
url: jdbc:mysql://127.0.0.1:3306/test
username: root
password: root
driver-class-name: com.mysql.cj.jdbc.Driver
在本地数据库中创建test数据库，并新建一个表t_user
CREATE DATABASE test;
CREATE TABLE `t_user` (
`user_id` int(11) NOT NULL AUTO_INCREMENT,
`user_name` varchar(225) NOT NULL,
`password` varchar(225) NOT NULL,
`phone` varchar(225) NOT NULL,
PRIMARY KEY (`user_id`)
) ENGINE=InnoDB AUTO_INCREMENT=1000 DEFAULT CHARSET=utf8
这里我们使用mybatis-generator插件，自动生成实体类，mapper，以及mapper.xml文件
在pom中添加build依赖（放在层次外面）
<build>
<resources>
<resource>
<directory>src/main/resources</directory>
<filtering>true</filtering>
<excludes>
<exclude>generator/**</exclude>
</excludes>
</resource>
</resources>
<plugins>
<plugin>
<groupId>org.mybatis.generator</groupId>
<artifactId>mybatis-generator-maven-plugin</artifactId>
<version>1.3.4-SNAPSHOT</version>
<dependencies>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.39</version>
</dependency>
<dependency>
<groupId>org.mybatis.generator</groupId>
<artifactId>mybatis-generator-core</artifactId>
<version>1.3.4-SNAPSHOT</version>
</dependency>
</dependencies>
<configuration>
<overwrite>true</overwrite>
<configurationFile>src/main/resources/generator/generatorConfig.xml</configurationFile>
</configuration>
</plugin>
</plugins>
</build>
在src/main/resources/下面新建一个目录generator，在此目录下新建一个generatorConfig.xml文件(注意根据自己的目录，调整路径）
<?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>
<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://127.0.0.1:3306/test"
userId="root"
password="root">
</jdbcConnection>
<javaTypeResolver>
<property name="forceBigDecimals" value="false"/>
</javaTypeResolver>
<!--生成Model类存放位置-->
<javaModelGenerator targetPackage="com.lw.study.dao.domain" targetProject="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="sqlmap" targetProject="src/main/resources/">
<property name="enableSubPackages" value="true"/>
</sqlMapGenerator>
<!--生成Dao类存放位置-->
<!-- 客户端代码，生成易于使用的针对Model对象和XML配置文件 的代码
type="ANNOTATEDMAPPER",生成Java Model 和基于注解的Mapper对象
type="MIXEDMAPPER",生成基于注解的Java Model 和相应的Mapper对象
type="XMLMAPPER",生成SQLMap XML文件和独立的Mapper接口
-->
<javaClientGenerator type="XMLMAPPER" targetPackage="com.lw.study.dao.mapper" targetProject="src/main/java">
<property name="enableSubPackages" value="true"/>
</javaClientGenerator>
<!--生成对应表及类名-->
<!--<table schema="loandb" tableName="T_AUDIT_JOB" domainObjectName="AuditJob">-->
<!--<property name="useActualColumnNames" value="true"/>-->
<!--<generatedKey column="Id" sqlStatement="MySql" identity="true"/>-->
<!--</table>-->
<table tableName="t_user" domainObjectName="User" enableCountByExample="false" enableUpdateByExample="false" enableDeleteByExample="false" enableSelectByExample="false" selectByExampleQueryId="false"></table>
</context>
</generatorConfiguration>
然后运行generator配置文件。
在点击左上角的➕，选择maven
Working derectory选择自己的项目路径。然后apply，在右上角运行就可以了，就会在指定的目录下生成三个文件（实体类，mapper类，和mapper.xml文件）
最后在src/main/java/com/lw/study/目录下新建一个mybatisConfig目录，里面新建两个配置类。
MybatisConfig.java
@Configuration
@EnableTransactionManagement
public class MyBatisConfig {
@Bean
@ConfigurationProperties(prefix = "spring.datasource")
public DataSource dataSource(){
return new org.apache.tomcat.jdbc.pool.DataSource();
}
@Bean(name = "sqlSessionFactory")
public SqlSessionFactory sqlSessionFactoryBean() throws Exception {
SqlSessionFactoryBean sqlSessionFactoryBean = new SqlSessionFactoryBean();
sqlSessionFactoryBean.setDataSource(dataSource());
PathMatchingResourcePatternResolver resolver = new PathMatchingResourcePatternResolver();
sqlSessionFactoryBean.setMapperLocations(resolver.getResources("classpath:/sqlmap/*.xml"));
return sqlSessionFactoryBean.getObject();
}
}
MyBatisMapperScannerConfig.java
@Configuration
@AutoConfigureAfter(MyBatisConfig.class)
public class MyBatisMapperScannerConfig {
@Bean
public MapperScannerConfigurer mapperScannerConfigurer() {
MapperScannerConfigurer mapperScannerConfigurer = new MapperScannerConfigurer();
mapperScannerConfigurer.setSqlSessionFactoryBeanName("sqlSessionFactory");
mapperScannerConfigurer.setBasePackage("com.study.dao.mapper");
return mapperScannerConfigurer;
}
}
创建一个springboot的启动类，Application.java
@SpringBootApplication(scanBasePackages = {"com.lw.study.*"})
@MapperScan("com.lw.study.mapper")
public class Application {
public static void main(String[] args) {
SpringApplication.run(Application.class,args);
}
}好了，到这里我们在springboot中通过generator插件的方式集成mybatis就完成了。大家可以自己写一个测试类，使用mapper中的方法看能否在数据库中查到数据。