Spring-通过mybatis操作数据库

1，编写数据源

2，sqlSessionFactory

3，sqlSessionTemplate

4，添加接口实现类

5，单元测试

 

 

User.java

package com.miao.pojo;

import lombok.Data;

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

UserMapper

package com.miao.mapper;

import com.miao.pojo.User;

import java.util.List;

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

UserMapperImpl.java

package com.miao.mapper;

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

import java.util.List;

public class UserMapperImpl implements UserMapper{

    //之前操作mybatis都使用sqlSession，现在都使用sqlSessiontemplate

    private SqlSessionTemplate sqlSessionTemplate;
    public void setSqlSessionTemplate(SqlSessionTemplate sqlSessionTemplate)
    {
        this.sqlSessionTemplate=sqlSessionTemplate;
    }

    public List<User> selectUser() {
        List<User> userList = sqlSessionTemplate.getMapper(UserMapper.class).selectUser();
        return userList;
    }
}

UserMapper.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
        PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">


<mapper namespace="com.miao.mapper.UserMapper">
    <select id="selectUser" resultType="User">
        select * from mybatis.user;
    </select>


</mapper>

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>
    <!--这些标签的引入还需要注意顺序-->

    <!--引入外部配置文件-->
    <properties resource="db.properties"/>


    <!--引入log4j文件-->
    <settings>
        <!--<setting name="logImpl" value="LOG4J"/>--><!--开启日志-->
        <setting name="mapUnderscoreToCamelCase" value="true"/><!--开启驼峰转换设置-->
        <setting name="cacheEnabled" value="true"/><!--开启缓存-->
    </settings>

    <!--别名   简化代码-->
    <typeAliases>
        <package name="com.miao.pojo"/>
    </typeAliases>




    <!--此处的绑定接口会与spring中的   <property name="mapperLocations" value="classpath:com/miao/mapper/*.xml"/>    冲突-->
    <!--绑定接口-->
    <!--<mappers>
        <package name="com/miao/mapper"/>
    </mappers>-->

</configuration>

spring-dao.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:aop="http://www.springframework.org/schema/aop"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
        https://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/aop
        https://www.springframework.org/schema/aop/spring-aop.xsd
">



    <!--DataSources:使用Spring的数据源替换mybatis的配置-->

    <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
        <property name="driverClassName" value="com.mysql.cj.jdbc.Driver"/>
        <property name="url" value="jdbc:mysql://localhost:3306/mybatis?useUnicode=true&amp;characterEncoding=utf-8&amp;zeroDateTimeBehavior=convertToNull&amp;serverTimezone=UTC"/>
        <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-->
        <property name="configLocation" value="classpath:mybatis-config.xml"/>
        <property name="mapperLocations" value="classpath:com/miao/mapper/*.xml"/>
    </bean>

    <!--SqlSessionTemplate是我们使用的sqlSession-->
    <bean id="sqlSessionTemplate" class="org.mybatis.spring.SqlSessionTemplate">
        <!--只能用构造器注入sqlSession,因为他没有sqlSession-->
        <constructor-arg index="0" ref="sqlSessionFactory"/>
    </bean>





</beans>

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"
       xmlns:aop="http://www.springframework.org/schema/aop"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
        https://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/aop
        https://www.springframework.org/schema/aop/spring-aop.xsd
">
    <import resource="spring-dao.xml"/>


    <bean id="userMapper" class="com.miao.mapper.UserMapperImpl">
        <property name="sqlSessionTemplate" ref="sqlSessionTemplate"/>
    </bean>


</beans>

test.java

import com.miao.mapper.UserMapper;
import com.miao.pojo.User;
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 org.junit.Test;
import org.springframework.context.support.ClassPathXmlApplicationContext;

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

public class test {
    @Test
    public void test1() throws IOException {
        ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
        UserMapper userMapper = context.getBean("userMapper", UserMapper.class);

        for (User user : userMapper.selectUser())
        {
            System.out.println(user);
        }
    }

}