整合MyBatis

MegaDataFlowers2026-03-27 9:22

参考视频：【狂神说Java】Spring5最新完整教程IDEA版通俗易懂 点击观看

文章目录

导入相关jar包（junit、mybatis、mysql、spring、aop、mybatis-spring）

xml 复制代码 
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>com.findx</groupId>
        <artifactId>spring-study</artifactId>
        <version>1.0-SNAPSHOT</version>
    </parent>

    <artifactId>spring-10-mybatis</artifactId>
    <packaging>jar</packaging>

    <name>spring-10-mybatis</name>
    <url>http://maven.apache.org</url>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    </properties>

    <dependencies>
         <!--1 junit-->
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
        </dependency>
        <!--2 mysql-->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>8.0.32</version>
        </dependency>
        <!--3 mybatis-->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.5.19</version>
        </dependency>
        <!--4 spring-webmvc-->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>5.3.39</version>
        </dependency>
        <!--5 spring操作数据库要使用spring-jdbc-->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <version>5.3.39</version>
        </dependency>
        <!--6 aop织入包-->
        <dependency>
            <groupId>org.aspectj</groupId>
            <artifactId>aspectjweaver</artifactId>
            <version>1.9.7</version>
        </dependency>
        <!--7 mybatis-spring-->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis-spring</artifactId>
            <version>2.0.6</version>
        </dependency>
        <!--Lombok-->
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.18.34</version> <!-- 目前最新，兼容 JDK 8~23 -->
        </dependency>
    </dependencies>
    <!--在build中配置resources防止资源导出失败-->
    <build>
        <resources>
            <resource>
                <directory>src/main/java</directory>
                <includes>
                    <include>**/*.properties</include>
                    <include>**/*.xml</include>
                </includes>
                <filtering>false</filtering>
            </resource>
            <resource>
                <directory>src/main/resources</directory>
                <includes>
                    <include>**/*.properties</include>
                    <include>**/*.xml</include>
                </includes>
                <filtering>false</filtering>
            </resource>
        </resources>
    </build>
</project>

回忆mybatis

1、编写实体类

java 复制代码 
package com.findx.pojo;

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

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

2、编写核心配置文件

java 复制代码 
<?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核心配置文件-->
<configuration>

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

    <environments default="development">
        <environment id="development">
            <transactionManager type="JDBC"/>
            <dataSource type="POOLED">
                <property name="driver" value="com.mysql.cj.jdbc.Driver"/>
                <property name="url" value="jdbc:mysql://localhost:3306/mybatis?useSSL=true&amp;useUnicode=true&amp;characterEncoding=utf8&amp;serverTimezone=Asia/Shanghai"/>
                <property name="username" value="root"/>
                <property name="password" value="root"/>
            </dataSource>
        </environment>
    </environments>

    <mappers>
        <mapper class="com.findx.mapper.UserMapper"/>
    </mappers>
</configuration>

3、编写接口

java 复制代码 
package com.findx.mapper;

import com.findx.pojo.User;

import java.util.List;

public interface UserMapper {
    //查询所有用户返回List集合
    public List<User> getUserList();
}

4、编写Mapper.xml

java 复制代码 
<?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.findx.mapper.UserMapper">
    <select id="getUserList" resultType="User">
        select * from user
    </select>
</mapper>

5、编写工具类

java 复制代码 
package com.findx.utils;

import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;

import java.io.IOException;
import java.io.InputStream;

//sqlSessionFactory --> sqlSession
public class MybatisUtils {
    private static SqlSessionFactory sqlSessionFactory;
    static {
        try {
            //使用Mybatis第一步：获取sqlSessionFactory对象
            String resource = "mybatis-config.xml";
            InputStream inputStream = Resources.getResourceAsStream(resource);
            sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
    //既然有了 SqlSessionFactory，顾名思义，我们可以从中获得 SqlSession 的实例。
    //SqlSession 提供了在数据库执行 SQL 命令所需的所有方法。
    public static SqlSession getSqlSession(){
        return sqlSessionFactory.openSession(true);
    }
}

6、测试

java 复制代码 
package com.findx;

import com.findx.mapper.UserMapper;
import com.findx.pojo.User;
import com.findx.utils.MybatisUtils;
import org.apache.ibatis.session.SqlSession;
import org.junit.Test;

import java.util.List;

public class MyTest {
    @Test
    public void test() {
        SqlSession sqlSession = MybatisUtils.getSqlSession();
        UserMapper mapper = sqlSession.getMapper(UserMapper.class);
        List<User> userList = mapper.getUserList();
        for (User user : userList) {
            System.out.println(user);
        }
        sqlSession.close();
    }
}

7、可能遇到的问题

xml 复制代码 
<!--在build中配置resources防止资源导出失败-->
<build>
    <resources>
        <resource>
            <directory>src/main/java</directory>
            <includes>
                <include>**/*.properties</include>
                <include>**/*.xml</include>
            </includes>
            <filtering>false</filtering>
        </resource>
        <resource>
            <directory>src/main/resources</directory>
            <includes>
                <include>**/*.properties</include>
                <include>**/*.xml</include>
            </includes>
            <filtering>false</filtering>
        </resource>
    </resources>
</build>

mybatis-spring

帮助你将Mybatis代码无缝整合到Spring中。

1、编写数据源配置

xml 复制代码 
<!--DataSource：使用Spring的数据源来替换Mybatis的配置-->
<bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
   <property name="driverClassName" value="com.mysql.cj.jdbc.Driver"></property>
   <property name="url" value="jdbc:mysql://localhost:3306/mybatis?useSSL=true&amp;useUnicode=true&amp;characterEncoding=utf8&amp;serverTimezone=Asia/Shanghai"></property>
   <property name="username" value="root"></property>
   <property name="password" value="root"></property>
</bean>

2、sqlSessionFactory

xml 复制代码 
<!--sqlSessionFactory-->
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
   <!--绑定Mybatis配置文件-->
   <property name="configLocation" value="classpath:mybatis-config.xml"></property>
   <!--绑定数据源-->
   <property name="dataSource" ref="dataSource"></property>
   <!--绑定映射文件-->
   <property name="mapperLocations" value="classpath:com/findx/mapper/*.xml"></property>
</bean>

3、sqlSessionTemplate

xml 复制代码 
<!--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sqlSessionFactory-->
    <constructor-arg index="0" ref="sqlSessionFactory"></constructor-arg>
</bean>

4、需要给接口加实现类

java 复制代码 
package com.findx.mapper;

import com.findx.pojo.User;
import org.mybatis.spring.SqlSessionTemplate;

import java.util.List;

public class UserMapperImpl implements UserMapper{
    //SqlSessionTemplate
    private SqlSessionTemplate sqlSession;
    public void setSqlSession(SqlSessionTemplate sqlSession) {
        this.sqlSession = sqlSession;
    }
    @Override
    public List<User> getUserList() {
        return sqlSession.getMapper(UserMapper.class).getUserList();
    }
}

5、将自己写的实现类注入到Spring中

xml 复制代码 
<bean id="userMapper" class="com.findx.mapper.UserMapperImpl">
    <property name="sqlSession" ref="sqlSession"></property>
</bean>

6、测试使用即可

java 复制代码 
package com.findx;

import com.findx.mapper.UserMapper;
import com.findx.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 test() {
        ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
        UserMapper userMapper = context.getBean("userMapper", UserMapper.class);
        List<User> userList = userMapper.getUserList();
        for (User user : userList) {
            System.out.println(user);
        }
    }
}

spring-dao.xml

xml 复制代码 
<?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:aop="http://www.springframework.org/schema/aop"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/aop
        http://www.springframework.org/schema/aop/spring-aop.xsd">

        <!--DataSource：使用Spring的数据源来替换Mybatis的配置-->
    <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
        <property name="driverClassName" value="com.mysql.cj.jdbc.Driver"></property>
        <property name="url" value="jdbc:mysql://localhost:3306/mybatis?useSSL=true&amp;useUnicode=true&amp;characterEncoding=utf8&amp;serverTimezone=Asia/Shanghai"></property>
        <property name="username" value="root"></property>
        <property name="password" value="root"></property>
    </bean>
        <!--sqlSessionFactory-->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <!--绑定Mybatis配置文件-->
        <property name="configLocation" value="classpath:mybatis-config.xml"></property>
        <!--绑定数据源-->
        <property name="dataSource" ref="dataSource"></property>
        <!--绑定映射文件-->
        <property name="mapperLocations" value="classpath:com/findx/mapper/*.xml"></property>
    </bean>
        <!--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sqlSessionFactory-->
        <constructor-arg index="0" ref="sqlSessionFactory"></constructor-arg>
    </bean>

</beans>

applicationContext.xml

xml 复制代码 
<?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:aop="http://www.springframework.org/schema/aop"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/aop
        http://www.springframework.org/schema/aop/spring-aop.xsd">
    <import resource="spring-dao.xml"></import>
    <bean id="userMapper" class="com.findx.mapper.UserMapperImpl">
        <property name="sqlSession" ref="sqlSession"></property>
    </bean>
</beans>

UserMapperImpl.java

java 复制代码 
package com.findx.mapper;

import com.findx.pojo.User;
import org.mybatis.spring.SqlSessionTemplate;

import java.util.List;

public class UserMapperImpl implements UserMapper{
    //SqlSessionTemplate
    private SqlSessionTemplate sqlSession;
    public void setSqlSession(SqlSessionTemplate sqlSession) {
        this.sqlSession = sqlSession;
    }
    @Override
    public List<User> getUserList() {
        return sqlSession.getMapper(UserMapper.class).getUserList();
    }
}
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