步骤:
- 编写数据源
- sqlSessionFactory
- sqlSessionTemplate
- 给接口添加实现类
- 将实现类,注册到spring容器中
- 测试
Maven 依赖
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.13.2</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.49</version>
</dependency>
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>3.5.7</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>5.3.7</version>
</dependency>
<!-- spring操作数据库的话,还需要一个spring-jdbc-->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jdbc</artifactId>
<version>5.3.7</version>
</dependency>
<dependency>
<groupId>org.aspectj</groupId>
<artifactId>aspectjweaver</artifactId>
<version>1.9.6</version>
</dependency>
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis-spring</artifactId>
<version>2.0.6</version>
</dependency>
</dependencies>
<!--maven 配置文件 资源过滤-->
<build>
<resources>
<resource>
<directory>src/main/java</directory>
<includes>
<include>**/*.properties</include>
<include>**/*.xml</include>
</includes>
<filtering>true</filtering>
</resource>
</resources>
</build>
数据库表
CREATE TABLE `user` (
`id` int(10) NOT NULL,
`name` varchar(30) DEFAULT NULL,
`pwd` varchar(30) DEFAULT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
User 实体类
package com.xg.pojo;
public class User {
private int id;
private String name;
private String pwd;
public User() {
}
public User(int id, String name, String pwd) {
this.id = id;
this.name = name;
this.pwd = pwd;
}
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;
}
public String getPwd() {
return pwd;
}
public void setPwd(String pwd) {
this.pwd = pwd;
}
@Override
public String toString() {
return "User{" +
"id=" + id +
", name='" + name + '\'' +
", pwd='" + pwd + '\'' +
'}';
}
}
UserMapper 接口
package com.xg.mapper;
import com.xg.pojo.User;
import java.util.List;
public interface UserMapper {
List<User> selectUsers();
}
UserMapper.xml
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.xg.mapper.UserMapper">
<select id="selectUsers" resultType="user">
select *
from user
</select>
</mapper>
mybatis-config.xml
<?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>
<package name="com.xg.pojo"/>
</typeAliases>
</configuration>
方式一 :SqlSessionTemplate
UserMapperImpl
package com.xg.mapper;
import com.xg.pojo.User;
import org.mybatis.spring.SqlSessionTemplate;
import java.util.List;
public class UserMapperImpl implements UserMapper {
// 在之前所有操作,都使用 sqlSession 来执行。
// 现在都 使用 SqlSessionTemplate 来执行。
private SqlSessionTemplate sqlSession;
public void setSqlSession(SqlSessionTemplate sqlSession) {
this.sqlSession = sqlSession;
}
@Override
public List<User> selectUsers() {
UserMapper mapper = sqlSession.getMapper(UserMapper.class);
return mapper.selectUsers();
}
}
spring-dao.xml
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd">
<!-- DataSource : 使用Spring的数据源替换Mybatis 的配置 数据源(c3p0 dbcp druid-->
<bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
<property name="driverClassName" value="com.mysql.jdbc.Driver"/>
<property name="url"
value="jdbc:mysql://localhost:3306/mybatis?useSSL=false&useUnicode=true&characterEncoding=UTF-8"/>
<property name="username" value="root"/>
<property name="password" value="123456"/>
</bean>
<!-- sqlSessionFactory-->
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<property name="dataSource" ref="dataSource"/>
<!-- 绑定 mybatis-config.xml-->
<property name="configLocation" value="classpath:mybatis-config.xml"/>
<!-- 绑定 mapper-->
<property name="mapperLocations" value="classpath:com/xg/mapper/*.xml"/>
</bean>
<!-- SqlSessionTemplate : 就是 SqlSession -->
<bean id="sqlSession" class="org.mybatis.spring.SqlSessionTemplate">
<!-- 只能使用 构造器注入 参数-->
<constructor-arg name="sqlSessionFactory" ref="sqlSessionFactory"/>
</bean>
<!-- -->
<bean id="userMapper" class="com.xg.mapper.UserMapperImpl">
<property name="sqlSession" ref="sqlSession"/>
</bean>
</beans>
测试类
import com.xg.mapper.UserMapperImpl;
import com.xg.pojo.User;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import java.util.List;
public class MyTest {
@Test
public void springMybatis() {
ApplicationContext context = new ClassPathXmlApplicationContext("spring-dao.xml");
UserMapperImpl userMapper = context.getBean("userMapper", UserMapperImpl.class);
List<User> users = userMapper.selectUsers();
for (User user : users) {
System.out.println(user.toString());
}
}
}
方式二:SqlSessionDaoSupport
UserMapper2Impl
package com.xg.mapper;
import com.xg.pojo.User;
import org.mybatis.spring.support.SqlSessionDaoSupport;
import java.util.List;
public class UserMapper2Impl extends SqlSessionDaoSupport implements UserMapper {
@Override
public List<User> selectUsers() {
return getSqlSession().getMapper(UserMapper.class).selectUsers();
}
}
spring-dao.xml
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd">
<!-- DataSource : 使用Spring的数据源替换Mybatis 的配置 数据源(c3p0 dbcp druid-->
<bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
<property name="driverClassName" value="com.mysql.jdbc.Driver"/>
<property name="url"
value="jdbc:mysql://localhost:3306/mybatis?useSSL=false&useUnicode=true&characterEncoding=UTF-8"/>
<property name="username" value="root"/>
<property name="password" value="123456"/>
</bean>
<!-- sqlSessionFactory-->
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<property name="dataSource" ref="dataSource"/>
<!-- 绑定 mybatis-config.xml-->
<property name="configLocation" value="classpath:mybatis-config.xml"/>
<!-- 绑定 mapper-->
<property name="mapperLocations" value="classpath:com/xg/mapper/*.xml"/>
</bean>
<bean id="userMapper" class="com.xg.mapper.UserMapper2Impl">
<property name="sqlSessionFactory" ref="sqlSessionFactory"/>
</bean>
</beans>
测试类
import com.xg.mapper.UserMapper2Impl;
import com.xg.pojo.User;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import java.util.List;
public class MyTest {
@Test
public void sqlSessionDaoSupportTest(){
ApplicationContext context = new ClassPathXmlApplicationContext("spring-dao.xml");
UserMapper2Impl userMapper = context.getBean("userMapper", UserMapper2Impl.class);
List<User> users = userMapper.selectUsers();
for (User user : users) {
System.out.println(user.toString());
}
}
}