（四）mybatis学习之原始Dao开发方式及与spring整合

原始Dao开发方式

配置文件

使用之前的user.xml

sqlMapConfig.xml中也已经配置加载了user.xml

定义接口

public interface UserDao {//根据id查询用户信息public User findUserById(String id) throws Exception;//添加用户信息public void insertUser(User user) throws Exception;//根据Id删除用户信息public void deleteUserById(String id) throws Exception;}

定义实现类

public class UserDaoImpl implements UserDao {private SqlSessionFactory sqlSessionFactory;//使用构造函数注入SqlSessionFactorypublic UserDaoImpl(SqlSessionFactory sqlSessionFactory){this.sqlSessionFactory = sqlSessionFactory;}public User findUserById(String id) throws Exception {SqlSession sqlSession = sqlSessionFactory.openSession();User user = sqlSession.selectOne("xxxx.findUserById", id);//释放资源sqlSession.close();return user;}public void insertUser(User user) throws Exception {SqlSession sqlSession = sqlSessionFactory.openSession();sqlSession.insert("xxxx.addUser", user);sqlSession.commit();//释放资源sqlSession.close();}public void deleteUserById(String id) throws Exception {SqlSession sqlSession = sqlSessionFactory.openSession();sqlSession.insert("xxxx.deleteUserById", id);sqlSession.commit();//释放资源sqlSession.close();}}

代码测试

public class UserDaoImplTest {private SqlSessionFactory sqlSessionFactory;@Beforepublic void setUp() throws IOException{//创建SqlSessionFactoryString resource = "sqlMapConfig.xml";InputStream inputStream = Resources.getResourceAsStream(resource);//创建会话工厂sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);}@Testpublic void testFindUserById() throws Exception {//创建UserDao的对象UserDao userDao = new UserDaoImpl(sqlSessionFactory);//调用dao方法User user = userDao.findUserById("4028818f47e229d70147e2742f1b0005");System.out.println(user);}}

原始Dao开发方式及与spring的整合

mybatis配置文件

sqlMapConfig.xml

<?xml version="1.0" encoding="UTF-8" ?><!DOCTYPE configurationPUBLIC "-//mybatis.org//DTD Config 3.0//EN""http://mybatis.org/dtd/mybatis-3-config.dtd"><configuration><!-- 加载映射文件 --><mappers><mapper resource="sqlMap/user.xml"/></mappers></configuration>

映射文件

使用之前的user.xml

添加依赖包

在之前的项目基础上还需要加入spring的依赖包 、mybatis和spring的整合包

最终的pom.xml内容如下：

 <dependencies>    <!-- 添加servlet的依赖包 --><dependency><groupId>javax.servlet</groupId><artifactId>javax.servlet-api</artifactId><version>3.1.0</version></dependency>    <!-- 添加mybatis的依赖包 --><dependency><groupId>org.mybatis</groupId><artifactId>mybatis</artifactId><version>3.3.1</version></dependency><!-- 加入mysql数据库依赖包 --><dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId><version>5.1.38</version></dependency><!-- 添加log4j依赖包（slf4j和log4j） --><dependency><groupId>org.slf4j</groupId><artifactId>slf4j-log4j12</artifactId><version>1.7.20</version></dependency><dependency><groupId>log4j</groupId><artifactId>log4j</artifactId><version>1.2.17</version></dependency>    <!-- junit单元测试包 -->    <dependency>      <groupId>junit</groupId>      <artifactId>junit</artifactId>      <version>3.8.1</version>      <scope>test</scope>    </dependency>        <!-- 加入spring依赖包 -->    <dependency><groupId>org.springframework</groupId><artifactId>spring-core</artifactId><version>4.2.1.RELEASE</version></dependency><dependency><groupId>org.springframework</groupId><artifactId>spring-tx</artifactId><version>4.2.1.RELEASE</version></dependency><dependency><groupId>org.springframework</groupId><artifactId>spring-context</artifactId><version>4.2.1.RELEASE</version></dependency><dependency><groupId>org.springframework</groupId><artifactId>spring-beans</artifactId><version>4.2.1.RELEASE</version></dependency><dependency><groupId>org.springframework</groupId><artifactId>spring-jdbc</artifactId><version>4.2.1.RELEASE</version></dependency><!-- c3p0依赖包 --><dependency><groupId>com.mchange</groupId><artifactId>c3p0</artifactId><version>0.9.5.2</version></dependency><!-- mybatis和spring的整合包 --><dependency><groupId>org.mybatis</groupId><artifactId>mybatis-spring</artifactId><version>1.2.4</version></dependency>          </dependencies>

spring配置文件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"    xsi:schemaLocation="http://www.springframework.org/schema/beans        http://www.springframework.org/schema/beans/spring-beans.xsd"><!-- 配置数据源 -->   <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource" destroy-method="close">        <property name="driverClass" value="com.mysql.jdbc.Driver"/><property name="jdbcUrl" value="jdbc:mysql://localhost:3306/mybatisdb?characterEncoding=utf8&zeroDateTimeBehavior=convertToNull"/><property name="user" value="root"/><property name="password" value="888"/>        <property name="minPoolSize" value="5" />        <property name="initialPoolSize" value="5" />        <property name="maxPoolSize" value="50" />        <property name="maxIdleTime" value="30000" />        <property name="checkoutTimeout" value="6000"/>        <property name="acquireIncrement" value="5" />        <property name="acquireRetryAttempts" value="5" />        <property name="acquireRetryDelay" value="1000" />        <property name="idleConnectionTestPeriod" value="1800" />        <property name="breakAfterAcquireFailure" value="false" />        <property name="preferredTestQuery" value="select 1" />    </bean> <!-- SqlSessionFactory 原生态的mybatis里，sqlMapConfig.xml全局配置文件里配置了environments元素【配置数据源】和一些映射文件，我们是通过SqlSessionFactoryBuilder加载读取解析全局配置文件，然后生成SqlSessionFactory会话工厂。现在mybatis和spring进行整合，则sqlMapConfig.xml里不再需要environments，数据源的配置交给了spring来管理；SqlSessionFactoryBuilder解脱了，SqlSessionFactory会话工厂的创建交由spring来管理了--><bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean"><!-- 加载mybatis配置文件(此时配置文件里面主要是一些映射文件，一些全局的配置信息) --><property name="configLocation" value="sqlMapConfig.xml"/><!-- 数据源 --><property name="dataSource" ref="dataSource"/></bean><bean id="userDao" class="dao.impl.UserDaoImpl"><property name="sqlSessionFactory" ref="sqlSessionFactory"/></bean></beans>

dao接口

public interface UserDao {//根据id查询用户信息public User findUserById(String id) throws Exception;//添加用户信息public void insertUser(User user) throws Exception;//根据Id删除用户信息public void deleteUserById(String id) throws Exception;}

dao接口实现类

package dao.impl;import org.apache.ibatis.session.SqlSession;import org.mybatis.spring.support.SqlSessionDaoSupport;import dao.UserDao;import pojo.User;/** * * @ClassName: UserDaoImpl * @Description: 继承SqlSessionDaoSupport，使用该类，需要导入spring-tx.jar包* @author CARLO [e-mail]* @date 2016年4月3日 下午7:52:46 */public class UserDaoImpl extends SqlSessionDaoSupport implements UserDao {public User findUserById(String id) throws Exception {SqlSession sqlSession = this.getSqlSession();User user = sqlSession.selectOne("xxxx.findUserById", id);//释放资源.spring管理后，方法执行会自动释放资源//sqlSession.close();return user;}public void insertUser(User user) throws Exception {SqlSession sqlSession = this.getSqlSession();sqlSession.insert("xxxx.addUser", user);sqlSession.commit();//释放资源.spring管理后，方法执行会自动释放资源//sqlSession.close();}public void deleteUserById(String id) throws Exception {SqlSession sqlSession = this.getSqlSession();sqlSession.insert("xxxx.deleteUserById", id);sqlSession.commit();//释放资源.spring管理后，方法执行会自动释放资源//sqlSession.close();}}

测试

package mybatis;import org.junit.Before;import org.junit.Test;import org.springframework.context.ApplicationContext;import org.springframework.context.support.ClassPathXmlApplicationContext;import dao.UserDao;import pojo.User;public class UserDaoImplTest {private ApplicationContext context;@Beforepublic void setUp() throws Exception {context = new ClassPathXmlApplicationContext("classpath:ApplicationContext.xml");}@Testpublic void testFindUserById() throws Exception {UserDao userDao = context.getBean(UserDao.class);User user = userDao.findUserById("402881bc492d83bb01492d8630ad0000");System.out.println(user);}}