Spring(10)整合Mybatis

10.整合Mybatis

　　步骤：

　　1. 导入相关jar包

- - Junit
  - Mybatis
  - MySql数据库
  - Spring相关的
  - AOP植入
  - Mybatis-Spring[new]

　　以下是所以的包，我用的是maven在pom.xml中导入

<dependencies>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.11</version>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.47</version>
        </dependency>
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.4.6</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>5.1.9.RELEASE</version>
        </dependency>
        <!--Spring操作数据库的系统，还需要一个spring-jdnc -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <version>5.1.9.RELEASE</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>2.0.2</version>
        </dependency>
    </dependencies>

　　2.编写配置文件

　3.测试

12.1 回忆mybatis

　　1.编写实体类

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;
    }
}

　　2.编写核心配置文件

<?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">

<!--核心配置文件 -->
<configuration>

    <!-- 起别名-->
    <typeAliases>
        <typeAlias type="com.luo.pojo.User" alias="user"></typeAlias>
    </typeAliases>

    <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?serverTimeZone=GMT/mybatis?useSSL=true&amp;useUnicode=true&amp;characterEncoding=UTF8"/>
                <property name="username" value="root"/>
                <property name="password" value="123456"/>
            </dataSource>
        </environment>
    </environments>

    <!--绑定 -->
    <mappers>
       <mapper class="com.luo.mapper.UserMapper"></mapper>
    </mappers>
</configuration>

　　3.编写接口

package com.luo.mapper;

import com.luo.pojo.User;

import java.util.List;

public interface UserMapper {

    public List<User> queryUser();
}

　　4.编写Mapper.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">
<!-- 绑定对应的Dao接口-->
<mapper namespace="com.luo.mapper.UserMapper">

    <!-- select查询语句-->
    <select id="queryUser" resultType="user">
        select *from mybatis.user
    </select>
</mapper>

　　5.测试

import java.io.IOException;
import java.io.InputStream;
import java.util.List;

public class Test {

    public static void main(String[] args) throws IOException {

        String resources="mybatis-config.xml";
        InputStream in = Resources.getResourceAsStream(resources);

        SqlSessionFactory sessionFactory = new SqlSessionFactoryBuilder().build(in);
        SqlSession sqlSession = sessionFactory.openSession(true);

        UserMapper mapper = sqlSession.getMapper(UserMapper.class);
        List<User> userList = mapper.queryUser();
        for (User user:userList) {
            System.out.println(user.getId()+"\t"+user.getName()+"\t"+user.getPwd());
        }

    }
}

12.2 Mybatis-Spring（整合Mybatis）

　　如果要整合Mybatis的话，首先我们要编写配置数据源在Resources下创建一个spring文件创建位（spring-dao.xml）

　　　1.编写数据源配置文件　　2.sqlSessionFactory　　3.sqlSessionTemplate　

<?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
        http://www.springframework.org/schema/context
        https://www.springframework.org/schema/context/spring-context.xsd">

    <!-- 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-->
    <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?serverTimeZone=GMT/mybatis?useSSL=true&amp;useUnicode=true&amp;characterEncoding=UTF8"/>
        <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配置文件-->
        <property name="configLocation" value="classpath:mybatis-config.xml"></property>
        <property name="mapperLocations" value="classpath:com/luo/mapper/*.xml"></property>
    </bean>

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

    <bean id="userMapper" class="com.luo.mapper.UserMapperImp">
        <property name="sqlSession" ref="sqlSession"></property>
    </bean>
</beans>

　4.需要给接口加实现类　　5.将自己写的实现类，注入到Spring中。

package com.luo.mapper;

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

import java.util.List;

public class UserMapperImp implements UserMapper {

    //我们的所有操作，都使用sqlSession来操作，在原来，现在都使用SqlSessionTemplate
    private SqlSessionTemplate sqlSession;

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

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

6.测试

import com.luo.mapper.UserMapper;
import com.luo.pojo.User;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import java.io.IOException;
import java.util.List;

public class Test {

    public static void main(String[] args) throws IOException {

        ApplicationContext context = new ClassPathXmlApplicationContext("spring-dao.xml");

        UserMapper userMapper = context.getBean("userMapper", UserMapper.class);
        List<User> userList = userMapper.queryUser();

        for (User user:userList) {
            System.out.println(user.getId()+"\t"+user.getName()+"\t"+user.getPwd());
        }
    }
}

12.3 Mybatis-Spring（整合Mybatis方式二）

package com.luo.mapper;

import com.luo.pojo.User;
import org.mybatis.spring.support.SqlSessionDaoSupport;

import java.util.List;

public class UserMapperImp2 extends SqlSessionDaoSupport implements UserMapper {

    public List<User> queryUser() {
        return getSqlSession().getMapper(UserMapper.class).queryUser();
    }
}

  <bean id="userMapper2" class="com.luo.mapper.UserMapperImp2">
      <property name="sqlSessionFactory" ref="sqlSessionFactory"></property>
  </bean>

posted @ 2022-05-22 17:05 十三加油哦阅读(38) 评论(0) 收藏举报

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十三加油哦

Spring(10)整合Mybatis

10.整合Mybatis

12.1 回忆mybatis

12.2 Mybatis-Spring（整合Mybatis）

12.3 Mybatis-Spring（整合Mybatis方式二）

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