Spring 整合Mybatis的配置文件

目录

• 编写配置文件
  • mybatis-config.xml
  • spring-dao.xml
• sqlSession 注入到实现类中的两种方式
  • 第一种 set方法注入类
  • 第二种 继承 SqlSessionDaoSupport
• 测试
• 依赖

编写配置文件

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.pro.pojo"/>
    </typeAliases>

</configuration>

spring-dao.xml

注意这里需要绑定上面的 mybatis-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"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
        https://www.springframework.org/schema/beans/spring-beans.xsd">

    <!--1. 配置数据源替换mybatis数据源
        dataSource: 使用Spring的数据源替换Mybatis的配置 c3p0 dbcp druid
        我们这里使用Spring提供的JDBC: org.springframework.jdbc.datasource.DriverManagerDataSource
    -->
    <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=true&amp;useUnicode=true&amp;characterEncoding=utf8"/>
        <property name="username" value="root"/>
        <property name="password" value="123456"/>
    </bean>

    <!--2. SqlSessionFactory 关联 Mybatis-->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource"/>
        <!--关联/绑定 mybatis 配置文件-->
        <property name="configLocation" value="classpath:mybatis-config.xml"/>
        <!--绑定 Mapper.xml, 也可以放到 mybatis-config.xml 中去做-->
        <property name="mapperLocations" value="classpath:com/pro/dao/*.xml"/>
    </bean>

    <!--3. 注册 SqlSessionTemplate 关联 SqlSessionFactory
        SqlSessionTemplate: 就是我们使用的 sqlSession
    -->
    <bean id="sqlSession" class="org.mybatis.spring.SqlSessionTemplate">
        <!--只能使用构造器注入, 因为它没有set方法-->
        <constructor-arg index="0" ref="sqlSessionFactory"/>
    </bean>

	<!--4. 绑定bean, 注入参数-->
    <!--set注入参数-->
    <bean id="userMapper" class="com.pro.dao.UserMapperImpl">
        <property name="sqlSession" ref="sqlSession"/>
    </bean>

    <!--继承 SqlSessionDaoSupport 类-->
    <bean id="userMapper2" class="com.pro.dao.UserMapperImpl2">
        <!--sqlSessionFactory 和 sqlSessionTemplate 两个参数选一个注入就行-->
        <!--<property name="sqlSessionTemplate" ref="sqlSession"/>-->
        <property name="sqlSessionFactory" ref="sqlSessionFactory"/>
    </bean>

</beans>

sqlSession 注入到实现类中的两种方式

第一种 set方法注入类

这个类需要在Spring容器中注入

public class UserMapperImpl implements UserMapper {
    // 在原来我们使用 sqlSession, 现在都使用 sqlSessionTemplate
    private SqlSessionTemplate sqlSession;

    public void setSqlSession(SqlSessionTemplate sqlSession) {
        this.sqlSession = sqlSession;
    }

    @Override
    public List<User> getUserList() {
        UserMapper mapper = sqlSession.getMapper(UserMapper.class);
        return mapper.getUserList();
    }
}

第二种 继承 SqlSessionDaoSupport

这个类需要在Spring容器中注入

public class UserMapperImpl2 extends SqlSessionDaoSupport implements UserMapper {

    @Override
    public List<User> getUserList() {
    	// 继承 SqlSessionDaoSupport 类之后, 可以直接拿到 getSqlSession()
        SqlSession sqlSession = getSqlSession();
        UserMapper mapper = sqlSession.getMapper(UserMapper.class);
        return mapper.getUserList();
    }
}

测试

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class MyTest {
    @Test
    public void getUserList() throws IOException {
        ApplicationContext context = new ClassPathXmlApplicationContext("spring-dao.xml");
        // 测试set注入
//        UserMapper userMapper = context.getBean("userMapper", UserMapper.class);
        // 测试继承 SqlSessionDaoSupport 类
        UserMapper userMapper = context.getBean("userMapper2", UserMapper.class);
        for (User user : userMapper.getUserList()) {
            System.out.println(user);
        }
    }
}

依赖

<dependencies>
    <!--        单元测试-->
    <dependency>
        <groupId>junit</groupId>
        <artifactId>junit</artifactId>
        <version>4.13</version>
    </dependency>
    <!--        mysql驱动-->
    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
        <version>5.1.47</version>
    </dependency>
    <!--        mybatis-->
    <dependency>
        <groupId>org.mybatis</groupId>
        <artifactId>mybatis</artifactId>
        <version>3.5.2</version>
    </dependency>
    <!--        spring相关依赖-->
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-webmvc</artifactId>
        <version>5.2.0.RELEASE</version>
    </dependency>
    <!--spring 操作数据库需要一个 spring-jdbc 的包-->
    <!-- https://mvnrepository.com/artifact/org.springframework/spring-jdbc -->
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-jdbc</artifactId>
        <version>5.2.0.RELEASE</version>
    </dependency>
    <!--        aspectJ AOP 织入器-->
    <dependency>
        <groupId>org.aspectj</groupId>
        <artifactId>aspectjweaver</artifactId>
        <version>1.9.4</version>
    </dependency>
    <!--        mybatis-spring整合包-->
    <dependency>
        <groupId>org.mybatis</groupId>
        <artifactId>mybatis-spring</artifactId>
        <version>2.0.2</version>
    </dependency>
    <dependency>
        <groupId>org.projectlombok</groupId>
        <artifactId>lombok</artifactId>
        <version>1.18.10</version>
    </dependency>
</dependencies>

<build>
    <resources>
        <resource>
            <directory>src/main/java</directory>
            <includes>
                <include>**/*.properties</include>
                <include>**/*.xml</include>
            </includes>
            <filtering>true</filtering>
        </resource>
    </resources>
</build>