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Spring和Mybatis整合详解

2019-02-15  本文已影响10人  逍遥天扬

Spring和Mybatis整合详解

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Spring

Mybatis

概述

MyBatis-Spring 会帮助你将 MyBatis 代码无缝地整合到 Spring 中。 使用这个类库中的类, Spring 将会加载必要的MyBatis工厂类和 session 类。 这个类库也提供一个简单的方式来注入MyBatis数据映射器和SqlSession到业务层的bean中。 而且它也会处理事务, 翻译MyBatis的异常到Spring的 DataAccessException异常(数据访问异常,译者注)中。最终它并不会依赖于MyBatis,Spring或MyBatis-Spring来构建应用程序代码。

Hibernate是一个开源的对象关系映射框架。Mybatis是一款优秀的持久层框架。支持定制化SQL、存储过程以及高级映射。Mybatis避免了几乎所有的JDBC代码和手动设置参数以及获取结果集。

下面复制粘贴了一些Hibernate与MyBatis的异同:

Hibernate与MyBatis都可以是通过SessionFactoryBuider由XML配置文件生成SessionFactory,然后由SessionFactory 生成Session,最后由Session来开启执行事务和SQL语句。其中SessionFactoryBuider,SessionFactory,Session的生命周期都是差不多的。

Hibernate和MyBatis都支持JDBC和JTA事务处理。

Mybatis优势:

MyBatis可以进行更为细致的SQL优化,可以减少查询字段。
MyBatis容易掌握,而Hibernate门槛较高。

Hibernate优势:

Hibernate的DAO层开发比MyBatis简单,Mybatis需要维护SQL和结果映射。
Hibernate对对象的维护和缓存要比MyBatis好,对增删改查的对象的维护要方便。
Hibernate数据库移植性很好,MyBatis的数据库移植性不好,不同的数据库需要写不同SQL。
Hibernate有更好的二级缓存机制,可以使用第三方缓存。MyBatis本身提供的缓存机制不佳。

Git地址:
Gitee

项目地址:
品茗IT-Spring之路专题

品茗IT:提供在线快速构建Spring项目工具。

开始搭建

依赖Jar包

<dependency>
    <groupId>org.mybatis</groupId>
    <artifactId>mybatis</artifactId>
    <version>3.2.5</version>
</dependency>
<dependency>
    <groupId>org.mybatis</groupId>
    <artifactId>mybatis-spring</artifactId>
    <version>1.3.0</version>
</dependency>
<!-- druid -->
<dependency>
    <groupId>com.alibaba</groupId>
    <artifactId>druid</artifactId>
    <version>1.1.9</version>
</dependency>

MyBatis要依赖一个数据源。

spring-mybatis.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"
    xmlns:tx="http://www.springframework.org/schema/tx" xmlns:context="http://www.springframework.org/schema/context"
    xsi:schemaLocation="
                    http://www.springframework.org/schema/beans
                    http://www.springframework.org/schema/beans/spring-beans-4.0.xsd
                    http://www.springframework.org/schema/tx 
                    http://www.springframework.org/schema/tx/spring-tx-4.0.xsd
                    http://www.springframework.org/schema/aop 
                    http://www.springframework.org/schema/aop/spring-aop-4.0.xsd
                    http://www.springframework.org/schema/context      
                    http://www.springframework.org/schema/context/spring-context-4.0.xsd">

    <bean id="annotationPropertyConfigurerMybatis"
        class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
        <property name="order" value="1" />
        <property name="ignoreUnresolvablePlaceholders" value="true" />
        <property name="locations">
            <list>
                <value>classpath:properties/db-config-test.properties</value>
            </list>
        </property>
    </bean>
    
    <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource"
        init-method="init" destroy-method="close">
        <property name="driverClassName" value="${db.dirverClass}"></property>
        <property name="url" value="${db.url}" />
        <property name="username" value="${db.username}" />
        <property name="password" value="${db.password}" />

        <property name="initialSize" value="1" />
        <property name="minIdle" value="1" />
        <property name="maxActive" value="20" />

        <property name="maxWait" value="60000" />

        <property name="timeBetweenEvictionRunsMillis" value="60000" />

        <property name="minEvictableIdleTimeMillis" value="300000" />

        <property name="validationQuery" value="SELECT 1" />
        <property name="testWhileIdle" value="true" />
        <property name="testOnBorrow" value="false" />
        <property name="testOnReturn" value="false" />

        <property name="poolPreparedStatements" value="true" />
        <property name="maxPoolPreparedStatementPerConnectionSize"
            value="20" />

        <property name="filters" value="stat" />
    </bean>

    <bean id="transactionManager"
        class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" ref="dataSource"></property>
    </bean>

    <tx:annotation-driven transaction-manager="transactionManager" />

    <!-- jdbcTemplate -->
    <bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
        <property name="dataSource" ref="dataSource"></property>
    </bean>

    <!-- mybatis -->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource" />
        <property name="configLocation" value="classpath:mybatis/mybatis-config.xml" />
        <property name="mapperLocations" value="classpath:mybatis/mapper/*.xml" />
    </bean>
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="basePackage" value="com.cff.springwork.mybatis.mapper" />
    </bean>
</beans>

spring-mybatis.xml配置了数据源及mybatis的配置和映射文件。spring-mybatis.xml配置完成后,只需要在spring的配置文件中
<import resource="classpath*:spring-mybatis.xml"/>
即可

DB配置文件:

db.url=jdbc:mysql://127.0.0.1:3306/cff?useUnicode=true&characterEncoding=utf8&serverTimezone=UTC
db.username=cff
db.password=123456
db.dirverClass=com.mysql.cj.jdbc.Driver

Mybatis的配置

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> 
<settings>    
        <setting name="logImpl" value="LOG4J" />      
    </settings> 
</configuration>  

这里配置了Mybatis的日志打印方式。

Mybatis的映射文件

映射文件xml需要和配套的Mapper接口一起定义。

mybatis-appuser.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.cff.springwork.mybatis.mapper.AppUserMapper">
    <resultMap id="BaseResultMap" type="com.cff.springwork.model.security.AppUser">
        <result column="uuid" property="uuid" />
        <result column="user_name" property="userName" />
        <result column="passwd" property="password" />
        <result column="user_type" property="userType" />
        <result column="user_no" property="userNo" />
    </resultMap>
    <sql id="Base_Column_List">
        uuid, user_name, passwd, user_type,user_no
    </sql>
    <select id="getAppUser" resultMap="BaseResultMap" parameterType="java.lang.String">
        select
        <include refid="Base_Column_List" />
        from se_app_user
        where user_no = #{userNo}
    </select>
    
    <select id="getAppUserByType" resultMap="BaseResultMap" parameterType="java.lang.String">
        select
        <include refid="Base_Column_List" />
        from se_app_user
        where user_type = #{userType}
    </select>
    
    <select id="getAppUserByUserName" resultMap="BaseResultMap" parameterType="java.lang.String">
        select
        <include refid="Base_Column_List" />
        from se_app_user
        where user_name = #{userName}
    </select>
    
    <insert id="save" parameterType="com.cff.springwork.model.security.AppUser">
        insert into se_app_user(uuid, user_name, passwd, user_type,user_no) 
            value(
            #{uuid},
            #{userName},
            #{password},
            #{userType},
            #{userNo}
            )
    </insert>
    
    <update id="modify" parameterType="com.cff.springwork.model.security.AppUser">
        update se_app_user
        <set>
            <if test="password != null">passd=#{password}</if>
        </set>
        where user_name=#{userName}
    </update>

</mapper>  

Mapper接口:

package com.cff.springwork.mybatis.mapper;

import java.util.List;

import com.cff.springwork.model.security.AppUser;

public interface AppUserMapper {
    public List<AppUser> getAppUser(String userNo);
    
    public List<AppUser> getAppUserByType(String userType);
    
    public List<AppUser> getAppUserByUserName(String userName);
    
    public void save(AppUser appUser);
    
    public void modify(AppUser appUser);
    
}

Service调用

以上配置完成后,就可以直接调用Mapper了,当然,只能是Spring的bean调用,毕竟Mapper只是个接口,它是由Spring生成代理来调用的。

AppUserService:

package com.cff.springwork.mybatis.service;

import java.util.List;
import java.util.UUID;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.LinkedBlockingQueue;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import com.cff.springwork.common.constant.Constant;
import com.cff.springwork.model.security.AppUser;
import com.cff.springwork.mybatis.mapper.AppUserMapper;

@Service
@Transactional
public class AppUserService {
    @Autowired
    AppUserMapper appUserMapper;

    @Autowired
    AppSeqService appSeqService;

    public void save(AppUser appUser) {
        String uuid = UUID.randomUUID().toString().replace("-", "");
        appUser.setUuid(uuid);
        appUser.setUserNo(appSeqService.nextSeq(Constant.USERSEQ));
        appUser.setUserType(Constant.USERTYPE);
        appUserMapper.save(appUser);
    }

    public AppUser findByName(String userName) {
        List<AppUser> appusers = appUserMapper.getAppUserByUserName(userName);
        if (appusers == null || appusers.size() < 1) {
            return null;
        }
        return appusers.get(0);
    }
    
    public List<AppUser> findByType(String userType) {
        List<AppUser> appusers = appUserMapper.getAppUserByType(userType);
        if (appusers == null || appusers.size() < 1) {
            return null;
        }
        return appusers;
    }

    public boolean modify(AppUser user) {
        try {
            appUserMapper.modify(user);
        } catch (Exception e) {
            e.printStackTrace();
            return false;
        }
        return true;
    }
}

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