Spring08：整合Mybatis

Spring08：整合Mybatis

Mybatis回顾

新建项目

依赖，资源过滤，跳过测试

<dependencies>
    <dependency>
        <groupId>junit</groupId>
        <artifactId>junit</artifactId>
        <version>4.13.1</version>
    </dependency>
    <dependency>
        <groupId>org.mybatis</groupId>
        <artifactId>mybatis</artifactId>
        <version>3.5.6</version>
    </dependency>
    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
        <version>8.0.22</version>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-webmvc</artifactId>
        <version>5.3.1</version>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-jdbc</artifactId>
        <version>5.3.1</version>
    </dependency>
    <dependency>
        <groupId>org.aspectj</groupId>
        <artifactId>aspectjweaver</artifactId>
        <version>1.9.4</version>
    </dependency>
    <dependency>
        <groupId>org.mybatis</groupId>
        <artifactId>mybatis-spring</artifactId>
        <version>2.0.6</version>
    </dependency>
</dependencies>

<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>true</filtering>
        </resource>
    </resources>

    <plugins>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-surefire-plugin</artifactId>
            <version>2.4.2</version>
            <configuration>
                <skipTests>true</skipTests>
            </configuration>
        </plugin>
    </plugins>

</build>

db.properties

username=root
password=123456
url=jdbc:mysql://localhost:3306/mybatis?useSSL=true&useUnicode=true&characterEncoding=utf8
driver=com.mysql.jdbc.Driver

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>

    <properties resource="db.properties"/>

    <typeAliases>
        <package name="com.wgg.pojo"/>
    </typeAliases>

    <environments default="development">
        <environment id="development">
            <transactionManager type="JDBC"/>
            <dataSource type="POOLED">
                <property name="driver" value="${driver}"/>
                <property name="url" value="${url}"/>
                <property name="username" value="${username}"/>
                <property name="password" value="${password}"/>
            </dataSource>
        </environment>
    </environments>

    <mappers>
        <package name="com.wgg.dao"/>
    </mappers>

</configuration>

MybatisUtil

public class MybatisUtil {

    private static SqlSessionFactory sqlSessionFactory;

    static {
        try {
            String resource = "mybatis-config.xml";
            InputStream inputStream = Resources.getResourceAsStream(resource);
            sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
        } catch (IOException e) {
            e.printStackTrace();
        }

    }

    //获取sqlSession连接
    public static SqlSession getSession() {
        return sqlSessionFactory.openSession();
    }

}

实体类

@Data
public class User {
    private int id;
    private String name;
    private String pwd;

}

UserMapper

public interface UserMapper {
    public List<User> selectUser();
}

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.wgg.dao.UserMapper">

    <select id="selectUser" resultType="User">
        select * from user
    </select>

</mapper>

测试

public class MyTest {
    @Test
    public void test(){
        SqlSession session = MybatisUtil.getSession();
        UserMapper mapper = session.getMapper(UserMapper.class);
        List<User> users = mapper.selectUser();

        for (User user : users) {
            System.out.println(user);
        }
        session.close();
    }
}

spring中整合mybatis

需要导入依赖

<dependency>
   <groupId>org.mybatis</groupId>
   <artifactId>mybatis-spring</artifactId>
   <version>2.0.2</version>
</dependency>

使用SqlSessionFactoryBean来创建SqlSessionFactory，属性dataSource

SqlSessionFactory来创建SqlSession

使用SqlSessionTemplate来替换SqlSession

整合实现一

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.wgg.pojo"/>
    </typeAliases>

</configuration>

beans.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">

    <!--数据源的bean-->
    <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
        <property name="username" value="root"/>
        <property name="password" value="164582"/>
        <property name="url" value="jdbc:mysql://localhost:3306/mybatis?useSSL=true&amp;useUnicode=true&amp;characterEncoding=utf8"/>
        <property name="driverClassName" value="com.mysql.jdbc.Driver"/>
    </bean>

    <!--sqlSessionFactory-->
    <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/wgg/dao/*.xml"/>
    </bean>

    <!--sqlSessionTemplate-->
    <bean id="sqlSession" class="org.mybatis.spring.SqlSessionTemplate">
        <constructor-arg index="0" ref="sqlSessionFactory"/>
    </bean>

    <bean id="userDao" class="com.wgg.dao.UserDaoImpl">
        <property name="sqlSession" ref="sqlSession"/>
    </bean>


</beans>

User

@Data
public class User {
    private int id;
    private String name;
    private String pwd;

}

UserMapper

public interface UserMapper {
    public List<User> selectUser();
}

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.wgg.dao.UserMapper">

    <select id="selectUser" resultType="User">
        select * from user
    </select>

</mapper>

UserDaoImpl

public class UserDaoImpl implements UserMapper {
    
    private SqlSessionTemplate sqlSession;

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

    public List<User> selectUser() {
        UserMapper mapper = sqlSession.getMapper(UserMapper.class);

        return mapper.selectUser();
    }
}

测试

@Test
public void test2(){
    ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext("beans.xml");
    UserDaoImpl userDao = (UserDaoImpl) context.getBean("userDao");

    List<User> users = userDao.selectUser();
    for (User user : users) {
        System.out.println(user);
    }
}

整合实现二

dao继承Support类，直接利用getSqlSession()获得

UserDaoImpl

public class UserDaoImpl extends SqlSessionDaoSupport implements UserMapper {
    
    public List<User> selectUser() {
        UserMapper mapper = getSqlSession().getMapper(UserMapper.class);

        return mapper.selectUser();
    }
}

beans.xml

<bean id="userDao" class="com.wgg.dao.UserDaoImpl">
    <property name="sqlSessionFactory" ref="sqlSessionFactory"/>
</bean>

本文地址：https://blog.csdn.net/qq_43349162/article/details/110239086