你所不知的spring与mybatis整合方法

时间 2019-12-06

原文原文链接

内容目录

一、采用MapperScannerConfigurer 二、采用接口org.apache.ibatis.session.SqlSession的实现类org.mybatis.spring.SqlSessionTemplate 三、采用抽象类org.mybatis.spring.support.SqlSessionDaoSupport提供SqlSessionjava

1、采用MapperScannerConfigurer

它将会查找类路径下的映射器并自动将它们建立成MapperFactoryBean。spring

spring-mybatis.xml:sql

<?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:p="http://www.springframework.org/schema/p"
    xmlns:context="http://www.springframework.org/schema/context"
    xmlns:mvc="http://www.springframework.org/schema/mvc"
    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.1.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.1.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd">
    <!-- 自动扫描 -->
    <context:component-scan base-package="com.hua.saf" />
    <!-- 引入配置文件 -->
    <bean id="propertyConfigurer" class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
        <property name="location" value="classpath:jdbc.properties" />
    </bean>

    <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">
        <property name="driverClassName" value="${driver}" />
        <property name="url" value="${url}" />
        <property name="username" value="${username}" />
        <property name="password" value="${password}" />
        <!-- 初始化链接大小 -->
        <property name="initialSize" value="${initialSize}" />
        <!-- 链接池最大数量 -->
        <property name="maxActive" value="${maxActive}" />
        <!-- 链接池最大空闲 -->
        <property name="maxIdle" value="${maxIdle}" />
        <!-- 链接池最小空闲 -->
        <property name="minIdle" value="${minIdle}" />
        <!-- 获取链接最大等待时间 -->
        <property name="maxWait" value="${maxWait}" />
    </bean>

    <!-- spring和MyBatis完美整合，不须要mybatis的配置映射文件 -->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource" />
        <!-- 自动扫描mapping.xml文件，**表示迭代查找 -->
        <property name="mapperLocations" value="classpath:com/hua/saf/**/*.xml" />
    </bean>

    <!-- DAO接口所在包名，Spring会自动查找其下的类 ,包下的类须要使用@MapperScan注解,不然容器注入会失败 -->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="basePackage" value="com.hua.saf.*" />
        <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory" />
    </bean>

    <!-- (事务管理)transaction manager, use JtaTransactionManager for global tx -->
    <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" ref="dataSource" />
    </bean>    
</beans>
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UserMapper.xml:apache

<?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">
<!-- 为这个mapper指定一个惟一的namespace，namespace的值习惯上设置成包名+sql映射文件名，这样就可以保证namespace的值是惟一的
例如namespace="me.gacl.mapping.userMapper"就是me.gacl.mapping(包名)+userMapper(userMapper.xml文件去除后缀)
-->
<mapper namespace="com.hua.saf.dao.UserDao">
&emsp;&emsp;<!-- 
&emsp;&emsp;在select标签中编写查询的SQL语句， 设置select标签的id属性为getUser，id属性值必须是惟一的，不可以重复,
&emsp;&emsp;使用parameterType属性指明查询时使用的参数类型，resultType属性指明查询返回的结果集类型
&emsp;&emsp;resultType="com.hua.saf.User"就表示将查询结果封装成一个User类的对象返回,User类就是t_user表所对应的实体类
&emsp;&emsp;-->
&emsp;&emsp;<!-- 根据id查询获得一个user对象-->
&emsp;&emsp;<select id="getUser" parameterType="int" resultType="com.hua.saf.pojo.User">
&emsp;&emsp;&emsp;&emsp;select * from t_user where id=#{id}
&emsp;&emsp;</select>
</mapper>
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dao类：spring-mvc

/** 
* 这里的@MapperScan就是上面所讲的Mapper扫描器中所须要的配置，会自动生成代理对象。 
* 注意，接口中的方法名称要和对应的MyBatis映射文件中的语句的id值同样，由于生成的 
* 动态代理，会根据这个匹配相应的Sql语句执行。另外就是方法的参数和返回值也须要注 
* 意。接口中的方法如何定义，对应的MyBatis映射文件就应该进行相应的定义。 
* 最后，标注中的userDao是用来做为Spring的Bean的id(或name)进行使用的，方便我 
* 们在Service层进行注入使用。 
*/ 

@MapperScan
public interface UserDao {
&emsp;&emsp;//此处的方法名必须和mapper中的映射文件中的id同名
&emsp;&emsp;//回去映射文件中经过com.hua.saf.dao.UserDao.getUser,即this.getClass().getName()+".getUser"
&emsp;&emsp;public User getUser(int id);
}
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service类：bash

@Service("userService")
public class UserServiceImpl implements IUserService {

@Resource
private UserDao userDao;

&emsp;&emsp;public User getUser(int id) {
&emsp;&emsp;&emsp;&emsp;return userDao.getUser(id);
&emsp;&emsp;}
}
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2、采用接口org.apache.ibatis.session.SqlSession的实现类org.mybatis.spring.SqlSessionTemplate

mybatis中, sessionFactory可由SqlSessionFactoryBuilder.来建立。MyBatis-Spring 中，使用了SqlSessionFactoryBean来替代。SqlSessionFactoryBean有一个必须属性dataSource，另外其还有一个通用属性configLocation（用来指定mybatis的xml配置文件路径）。session

spring-mybatis.xmlmybatis

<?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:p="http://www.springframework.org/schema/p"
    xmlns:context="http://www.springframework.org/schema/context"
    xmlns:mvc="http://www.springframework.org/schema/mvc"
    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.1.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.1.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd">
    <!-- 自动扫描 -->
    <context:component-scan base-package="com.hua.saf" />
    <!-- 引入配置文件 -->
    <bean id="propertyConfigurer" class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
        <property name="location" value="classpath:jdbc.properties" />
    </bean>

    <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">
        <property name="driverClassName" value="${driver}" />
        <property name="url" value="${url}" />
        <property name="username" value="${username}" />
        <property name="password" value="${password}" />
        <!-- 初始化链接大小 -->
        <property name="initialSize" value="${initialSize}" />
        <!-- 链接池最大数量 -->
        <property name="maxActive" value="${maxActive}" />
        <!-- 链接池最大空闲 -->
        <property name="maxIdle" value="${maxIdle}" />
        <!-- 链接池最小空闲 -->
        <property name="minIdle" value="${minIdle}" />
        <!-- 获取链接最大等待时间 -->
        <property name="maxWait" value="${maxWait}" />
    </bean>

    <!-- spring和MyBatis完美整合，不须要mybatis的配置映射文件 -->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource" />
        <property name="configLocation"  value="classpath:sqlMapConfig.xml"/>
        <!-- 自动扫描mapping.xml文件，**表示迭代查找,也可在sqlMapConfig.xml中单独指定xml文件-->
        <property name="mapperLocations" value="classpath:com/hua/saf/**/*.xml" />
    </bean>

    <!-- mybatis spring sqlSessionTemplate,使用时直接让spring注入便可 -->
    <bean id="sqlSessionTemplate" class="org.mybatis.spring.SqlSessionTemplate">
        <constructor-arg index="0" ref="sqlSessionFactory"></constructor-arg>
    </bean>

    <!-- (事务管理)transaction manager, use JtaTransactionManager for global tx -->
    <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" ref="dataSource" />
    </bean>
</beans>
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sqlMapConfig.xmlmvc

<?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>  
    <typeAliases>
        <typeAlias type="com.hua.saf.pojo.User" alias="User" />
    </typeAliases>
</configuration>
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User.javaapp

public class User {

    private int id;
    private String username;
    private String password;
    private int age;

    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 getPassword() {
        return password;
    }
    public void setPassword(String password) {
        this.password = password;
    }
    public int getAge() {
        return age;
    }
    public void setAge(int age) {
        this.age = age;
    }
}
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UserDao.java

@Repository
public class UserDao{

    @Resource
    private SqlSessionTemplate sqlSessionTemplate;

    public User getUser(int id) {
        return sqlSessionTemplate.selectOne(this.getClass().getName() + ".getUser", 1);
    }   
}
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UserService.java

@Service
public class UserService{

    @Resource
    private UserDao userDao;

    public User getUser(int id) {
        return userDao.getUser(id);
    }
}
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3、采用抽象类org.mybatis.spring.support.SqlSessionDaoSupport提供SqlSession

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:p="http://www.springframework.org/schema/p"
    xmlns:context="http://www.springframework.org/schema/context"
    xmlns:mvc="http://www.springframework.org/schema/mvc"
    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.1.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.1.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd">
    <!-- 自动扫描 -->
    <context:component-scan base-package="com.hua.saf" />
    <!-- 引入配置文件 -->
    <bean id="propertyConfigurer" class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
        <property name="location" value="classpath:jdbc.properties" />
    </bean>

    <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">
        <property name="driverClassName" value="${driver}" />
        <property name="url" value="${url}" />
        <property name="username" value="${username}" />
        <property name="password" value="${password}" />
        <!-- 初始化链接大小 -->
        <property name="initialSize" value="${initialSize}" />
        <!-- 链接池最大数量 -->
        <property name="maxActive" value="${maxActive}" />
        <!-- 链接池最大空闲 -->
        <property name="maxIdle" value="${maxIdle}" />
        <!-- 链接池最小空闲 -->
        <property name="minIdle" value="${minIdle}" />
        <!-- 获取链接最大等待时间 -->
        <property name="maxWait" value="${maxWait}" />
    </bean>

    <!-- spring和MyBatis完美整合，不须要mybatis的配置映射文件 -->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource" />
        <property name="configLocation"  value="classpath:sqlMapConfig.xml"/>
        <!-- 自动扫描mapping.xml文件，**表示迭代查找,也可在sqlMapConfig.xml中单独指定xml文件-->
        <property name="mapperLocations" value="classpath:com/hua/saf/**/*.xml" />
    </bean>

    <!-- (事务管理)transaction manager, use JtaTransactionManager for global tx -->
    <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" ref="dataSource" />
    </bean>
</beans>
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sqlMapConfig.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>  
    <typeAliases>
        <typeAlias type="com.hua.saf.pojo.User" alias="User" />
    </typeAliases>
</configuration>
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User.java

public class User {

    private int id;
    private String username;
    private String password;
    private int age;


    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 getPassword() {
        return password;
    }
    public void setPassword(String password) {
        this.password = password;
    }
    public int getAge() {
        return age;
    }
    public void setAge(int age) {
        this.age = age;
    }
}
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UserDao.java

@Repository
public class UserDao extends SqlSessionDaoSupport{

    public User getUser(int id) {
        return this.getSqlSession().selectOne(this.getClass().getName() + ".getUser", 1);
    }
&emsp;&emsp;//使用SqlSessionDaoSupport必须注意，此处源码1.1.1中有自动注入，1.2中取消了自动注入，须要手工注入，侵入性强
&emsp;&emsp;//也可在spring-mybatis.xml中以下配置，可是这种有多少个dao就要配置到少个，多个dao就很麻烦。
&emsp;&emsp;//<bean id="userDao" class="com.hua.saf.dao.UserDao">
&emsp;&emsp;//    <property name="sqlSessionFactory" ref="sqlSessionFactory"/>
&emsp;&emsp;//</bean>
    @Resource
    public void setSqlSessionFactory(SqlSessionFactory sqlSessionFactory) {
        // TODO Auto-generated method stub
        super.setSqlSessionFactory(sqlSessionFactory);
    }
}
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UserService.java

@Service
public class UserService{

    @Resource
    private UserDao userDao;

    public User getUserss(int id) {
        return userDao.getUser(1);
    }
}
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