Spring 整合MyBatis
Spring 整合MyBatis
1.在pom.xml中导入依赖包
导入依赖包后，会自动下载，如果代码一直是红的 刷新Maven就行了
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.12</version>
</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>3.5.2</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>5.2.13.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jdbc</artifactId>
<version>5.2.13.RELEASE</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>
<!--配置Maven静态资源过滤问题！-->
<build>
<resources>
<resource>
<directory>src/main/java</directory>
<includes>
<include>**/*.properties</include>
<include>**/*.xml</include>
</includes>
<filtering>true</filtering>
</resource>
<resource>
<directory>src/main/resources</directory>
<includes>
<include>**/*.properties</include>
<include>**/*.xml</include>
</includes>
<filtering>false</filtering><!--防止application.xml被过滤-->
</resource>
</resources>
</build>
先给出完成后的Maven目录，以下建文件的步骤可以参照这个
2.类及接口，Mapper映射文件
编写pojo实体类 User.java
package com.kuang.pojo;
public class User {
//这里属性对应自己数据库user表里的字段，id，name姓名，pwd密码
private int id;
private String name;
private String pwd;
public User() {
}
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接口编写
package com.kuang.mapper;
import com.kuang.pojo.User;
import java.util.List;
public interface UserMapper {
public List<User> selectUser();
}
先创建mybatis的创建文件，里面可以配置别名等功能
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>
<!--设置别名，UserMapper.xml的返回值resultType="User"就行了
不用写全路径-->
<typeAliases>
<package name="com.kuang.pojo"/>
</typeAliases>
<!--这里省略，数据源会在Spring的配置文件中配置
<environments default="development">
<environment id="development">
<transactionManager type="JDBC"/>
<dataSource type="POOLED">
<property name="driver" value="com.mysql.jdbc.Driver"/>
<property name="url" value="jdbc:mysql://localhost:3306/mybatis?useSSL=true&useUnicode=true&characterEncoding=utf8"/>
<property name="username" value="root"/>
<property name="password" value="123456"/>
</dataSource>
</environment>
</environments>
-->
</configuration>
接口对应的Mapper映射文件
UserMapper.xml
<?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.kuang.mapper.UserMapper">
<select id="selectUser" resultType="User">
select * from user
</select>
</mapper>
3.引入Spring配置文件spring-config.xml
重点来了，Spring配置文件：spring-config.xml
里面<bean id=“sqlSessionFactory” 里可以引用mybatis-config.xml跟Mapper.xml文件
spring-config.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"
xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/beans
https://www.springframework.org/schema/beans/spring-beans.xsd">
<!--DataSource: 使用Spring的数据源替换Mybatis的配置，这里使用Spring提供的JDBC
注意：数据源导入自己数据库信息-->
<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&useEncode=true&characterEncode=UTF-8"/>
<property name="username" value="root"/>
<property name="password" value="123"/>
</bean>
<!--配置sqlSessionFactory，关联MyBatis-->
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<property name="dataSource" ref="dataSource"/>
<property name="configLocation" value="classpath:mybatis-config.xml"/>
<property name="mapperLocations" value="classpath:com/kuang/mapper/*.xml"/>
</bean>
<!--就是我们使用的sqlSession，注册sqlSessionTemplate，关联sqlSessionFactory-->
<bean id="sqlSession" class="org.mybatis.spring.SqlSessionTemplate">
<!--只能用构造器注入sqlSessionFactory，因为它没有set方法-->
<constructor-arg index="0" ref="sqlSessionFactory"/>
</bean>
</beans>
4.增加接口的实现类
增加UserMapper接口的实现类，私有化sqlSessionTemplate
UserMapperImpl.java
package com.kuang.mapper;
import com.kuang.pojo.User;
import org.mybatis.spring.SqlSessionTemplate;
import java.util.List;
public class UserMapperImpl implements UserMapper {
//sqlSession不用我们自己创建了，Spring来管理
private SqlSessionTemplate sqlSession;
public void setSqlSession(SqlSessionTemplate sqlSession) {
this.sqlSession = sqlSession;
}
public List<User> selectUser() {
UserMapper mapper = sqlSession.getMapper(UserMapper.class);
return mapper.selectUser();
}
}
5.注册bean实现
创建一个新的applicationContext.xml，import标签导入spring-config.xml，再编写bean的实现
applicationContext.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
https://www.springframework.org/schema/beans/spring-beans.xsd">
<import resource="spring-config.xml"/>
<!--把实现类UserMapperImpl 注入到容器bean中，sqlSession是参数-->
<bean id="userMapper" class="com.kuang.mapper.UserMapperImpl">
<property name="sqlSession" ref="sqlSession"/>
</bean>
</beans>
6.测试
MyTest.java
import com.kuang.mapper.UserMapper;
import com.kuang.pojo.User;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
public class MyTest {
@Test
public void test(){
ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
UserMapper userMapper = context.getBean("userMapper",UserMapper.class);
for (User user : userMapper.selectUser()) {
System.out.println(user);
}
}
}
连接数据库，打开数据库中的表
运行结果就是打印数据库user表中的数据
上述步骤亲测可运行，以上案例参考了狂神老师微信公众号 狂神说 上面的文章笔记来源：https://www.icode9.com/content-4-893251.html
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