mybatis快速入门(七)-spring-mybatis整合

2021-09-26 10:20:10

今天写写spring-mybatis整合吧，先写个原始dao类的整合，下一节在写个动态代理的整合，我就不写太详细了，因为前面的章节基本上都有了，我直接就一口气都写出来需要那些文件然后在直接贴代码，首先创建一个java项目,。

目录结构

1.db.properties数据连接池

jdbc.driver=com.mysql.jdbc.Driver

jdbc.url=jdbc:mysql://localhost:3306/mybatis

jdbc.username=root

jdbc.password=root

2.applicationContext.xml，spring的xml映射文件

<?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:mvc="http://www.springframework.org/schema/mvc"

    xmlns:context="http://www.springframework.org/schema/context"

    xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx"

    xsi:schemaLocation="http://www.springframework.org/schema/beans

        http://www.springframework.org/schema/beans/spring-beans-3.2.xsd

        http://www.springframework.org/schema/mvc

        http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd

        http://www.springframework.org/schema/context

        http://www.springframework.org/schema/context/spring-context-3.2.xsd

        http://www.springframework.org/schema/aop

        http://www.springframework.org/schema/aop/spring-aop-3.2.xsd

        http://www.springframework.org/schema/tx

        http://www.springframework.org/schema/tx/spring-tx-3.2.xsd ">

        <!-- 数据源配置 dbcp -->

        <context:property-placeholder location="classpath:db.properties"/>

        <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">

            <property name="driverClassName" value="${jdbc.driver}"></property>

            <property name="url" value="${jdbc.url}"></property>

            <property name="username" value="${jdbc.username}"></property>

            <property name="password" value="${jdbc.password}"></property>

            <property name="maxActive" value="10"></property>

            <property name="maxIdle" value="5"></property>

        </bean>

        <!-- 创建sqlsessionfactory -->

        <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">

            <property name="configLocation" value="mybatis/SqlMapConfig.xml"></property>

            <property name="dataSource" ref="dataSource"></property>

        </bean>

        <bean id="userDao" class="cn.my.sm.dao.UserDao" >

            <property name="sqlSessionFactory" ref="sqlSessionFactory"></property>

        </bean>

</beans>

3.SqlMapConfig.xml:mybatis的映射文件

<?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">

<configuration>

    <mappers>

        <mapper resource="sqlmap/User.xml"/>

    </mappers>

</configuration>

4.User.xml：实体类的映射文件,为了简便我就只写一个findById方法的映射了

<?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="cn.my.sm.mapper.UserDaoMapper">

    <select id="findById" parameterType="int" resultType="cn.my.sm.po.User">

        select * from user where id=#{id}

    </select>

</mapper>

5.创建User.java实体类

package cn.my.sm.po;

import java.util.Date;

public class User {

    private int id;

    private String username;// 用户姓名

    private String sex;// 性别

    private Date birthday;// 生日

    private String address;// 地址

    public int getId() {

        return id;

    }

    public void setId(int id) {

        this.id = id;

    }

    public String getUsername() {

        return username;

    }

    public void setUsername(String username) {

        this.username = username;

    }

    public String getSex() {

        return sex;

    }

    public void setSex(String sex) {

        this.sex = sex;

    }

    public Date getBirthday() {

        return birthday;

    }

    public void setBirthday(Date birthday) {

        this.birthday = birthday;

    }

    public String getAddress() {

        return address;

    }

    public void setAddress(String address) {

        this.address = address;

    }

    @Override

    public String toString() {

        return "User [id=" + id + ", username=" + username + ", sex=" + sex + ", birthday=" + birthday + ", address="

                + address + "]";

    }

}

6.创建UserDao.java数据访问类

package cn.my.sm.dao;

import org.apache.ibatis.session.SqlSession;

import org.mybatis.spring.support.SqlSessionDaoSupport;

import cn.my.sm.po.User;

//原始dao层需要继承SqlSessionDaoSupport类,或者自己声明一个sqlsessionfactory对象，添加setget方法，然后自己根据sqlsessionfactory工厂获取sqlsession

public class UserDao extends SqlSessionDaoSupport {

    public User findById(int id){

        SqlSession session = this.getSqlSession();

        User user = session.selectOne("cn.my.sm.mapper.UserDaoMapper.findById", id);

        return user;

    }

}

7.创建测试类

package cn.my.sm.test;

import org.junit.Before;

import org.junit.Test;

import org.springframework.context.ApplicationContext;

import org.springframework.context.support.ClassPathXmlApplicationContext;

import cn.my.sm.dao.UserDao;

import cn.my.sm.po.User;

@SuppressWarnings("resource")

public class TestUser {

    ApplicationContext context;

    @Before

    public void setUp(){

        context = new ClassPathXmlApplicationContext("classpath:spring/applicationContext.xml");

    }

    @Test

    public void testFindById(){

        UserDao userdao = (UserDao) context.getBean("userDao");

        User user = userdao.findById(1);

        System.out.println(user);

    }

}

允许结果：

User [id=1, username=王五, sex=2, birthday=null, address=null]

这样就原始整合完了，今天写得比较草率，如果大家有疑问的可以加群号581591235或者留言。也可以加微信群

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