Spring集成myBatis操作数据库
Posted zhengmengen
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学习来源: http://www.cnblogs.com/lhw1994/p/6759815.html
1. mybatis介绍
这是一个半自动化的框架,何谓半自动,因为它需要手工编写POJO、SQL和映射关系。虽然要多花点时间编写SQL语句,但至少在优化方面可以省心不少。
2. Spring与myBatis的结合
2.1 基础配置文件 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> <properties> <!-- 配置数据库方言 目前只有mysql和oracle两种--> <property name="dialect" value="mysql" /> </properties> <settings> <!-- 使用jdbc的getGeneratedKeys获取数据库自增主键值 --> <setting name="useGeneratedKeys" value="true" /> <!-- 使用列别名替换列名 默认:true --> <setting name="useColumnLabel" value="true" /> <!-- 开启驼峰命名转换:Table{create_time} -> Entity{createTime} --> <setting name="mapUnderscoreToCamelCase" value="true"/> <!-- 启用或禁用 缓存 --> <setting name="cacheEnabled" value="true" /> <!-- 启用或禁用延迟加载。当禁用时, 所有关联对象都会即时加载 --> <!-- <setting name="lazyLoadingEnabled" value="true" /> --> </settings> <!-- 设置别名 通过一个简单的别名来表示一个冗长的类型,这样可以降低复杂度。类型别名标签typeAliases中可以包含多个typeAlias --> <typeAliases> <typeAlias alias="user" type="com.lhw.test.user.entity.User" /> </typeAliases> <!-- 引入映射文件 --> <mappers> <!-- start base config --> <mapper resource="user/user.mapper.xml" /> </mappers> </configuration>
2.2 Spring的配置文件 applicationContext-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: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-3.1.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.1.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.1.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.1.xsd"> <!-- 开启注解扫描 --> <context:annotation-config /> <context:component-scan base-package="com.lhw.*" /> <!-- jdbc.properties文件路径 --> <context:property-placeholder location="classpath:jdbc.properties" ignore-unresolvable="true" /> <!-- 系统日志初始化配置类 --> <bean id="log4jInitialization" class="org.springframework.beans.factory.config.MethodInvokingFactoryBean"> <property name="targetClass" value="org.springframework.util.Log4jConfigurer" /> <property name="targetMethod" value="initLogging" /> <property name="arguments"> <list> <value>classpath:log4j.xml</value> </list> </property> </bean> <!-- 数据库日志初始化配置类 --> <bean id="log4jdbcInterceptor" class="net.sf.log4jdbc.DataSourceSpyInterceptor" /> <bean id="dataSourceLog4jdbcAutoProxyCreator" class="org.springframework.aop.framework.autoproxy.BeanNameAutoProxyCreator"> <property name="interceptorNames"> <list> <value>log4jdbcInterceptor</value> </list> </property> <property name="beanNames"> <list> <value>dataSource</value> </list> </property> </bean> <!-- 数据源的配置 --> <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close"> <property name="driverClassName" value="${jdbc.driverClassName}" /> <property name="url" value="${jdbc.url}" /> <property name="username" value="${jdbc.username}" /> <property name="password" value="${jdbc.password}" /> <!-- 设置连接池初始值 --> <property name="initialSize" value="1" /> <!-- 设置连接池最大值 --> <property name="maxActive" value="2" /> <!-- 设置连接池最大空闲值 --> <property name="maxIdle" value="2" /> <!-- 设置连接池最小空闲值 --> <property name="minIdle" value="1" /> <!--removeAbandoned: 是否自动回收超时连接--> <property name="removeAbandoned" value="true"/> <!--removeAbandonedTimeout: 超时时间(以秒数为单位)--> <property name="removeAbandonedTimeout" value="180"/> <!--maxWait: 超时等待时间以毫秒为单位 6000毫秒/1000等于60秒--> <property name="maxWait" value="3000"/> <!-- SQL查询,用来验证从连接池取出的连接 --> <property name="validationQuery" value="SELECT 1" /> <property name="testOnBorrow" value="true" /> <!-- 指明连接是否被空闲连接回收器(如果有)进行检验,如果检测失败,则连接将被从池中去除 --> <property name="testWhileIdle" value="true" /> <!-- 在每次空闲连接回收器线程(如果有)运行时检查的连接数量,最好和maxActive一致 --> <property name="numTestsPerEvictionRun" value="2"/> <!-- 在空闲连接回收器线程运行期间休眠的时间值,以毫秒为单位,一般比minEvictableIdleTimeMillis小 --> <property name="timeBetweenEvictionRunsMillis" value="60000" /> <!-- 连接池中连接,在时间段内一直空闲,被逐出连接池的时间(1000*60*60),以毫秒为单位 --> <property name="minEvictableIdleTimeMillis" value="300000" /> </bean> <!-- MyBatis sqlSessionFactory 配置 mybatis --> <bean name="sqlSessionFactory" id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean"> <property name="configLocation" value="classpath:config/mybatis_config.xml" /> <property name="dataSource" ref="dataSource" /> </bean> <bean id="sqlSession" class="org.mybatis.spring.SqlSessionTemplate"> <constructor-arg index="0" ref="sqlSessionFactory" /> </bean> <bean id="sqlSessionTemplate" class="org.mybatis.spring.SqlSessionTemplate"> <constructor-arg ref="sqlSessionFactory"/> </bean> <!-- 基于接口方式 --> <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer"> <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory" /> <property name="basePackage" value="com.lhw.test.service"></property> <property name="annotationClass" value="org.springframework.stereotype.Repository"></property> </bean> <!-- 事务控制 --> <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager"> <property name="globalRollbackOnParticipationFailure" value="false"></property> <property name="dataSource" ref="dataSource" /> </bean> <tx:annotation-driven transaction-manager="transactionManager"/> <aop:aspectj-autoproxy proxy-target-class="true" /> <tx:advice id="txAdvice" transaction-manager="transactionManager"> <tx:attributes> <tx:method name="get*" read-only="true" /> <tx:method name="query*" read-only="true" /> <tx:method name="save*" read-only="true" /> <tx:method name="update*" read-only="true" /> <tx:method name="del*" read-only="false" rollback-for="Exception" propagation="REQUIRED" /> <tx:method name="remove*" read-only="false" rollback-for="Exception" propagation="REQUIRED" /> <tx:method name="update*" read-only="false" rollback-for="Exception" propagation="REQUIRED" /> <tx:method name="modfiy*" read-only="false" rollback-for="Exception" propagation="REQUIRED" /> <tx:method name="add*" read-only="false" rollback-for="Exception" propagation="REQUIRED" /> <tx:method name="create*" read-only="false" rollback-for="Exception" propagation="REQUIRED" /> <tx:method name="insert*" read-only="false" rollback-for="Exception" propagation="REQUIRED" /> <tx:method name="*" read-only="false" rollback-for="Exception" propagation="REQUIRED" /> </tx:attributes> </tx:advice> <aop:config> <aop:pointcut id="serviceOperation" expression="execution(* com.lhw.test..service..*(..))" /> <aop:advisor advice-ref="txAdvice" pointcut-ref="serviceOperation" /> </aop:config> </beans>
2.3 JDBC的配置文件 jdbc.properties
#jdbc settings jdbc.driverClassName=com.mysql.jdbc.Driver jdbc.url=jdbc:mysql://localhost:3306/test?autoReconnect=true&useUnicode=true&characterEncoding=utf8&zeroDateTimeBehavior=convertToNull&noAccessToProcedureBodies=true jdbc.username=root jdbc.password=root
2.4 映射文件 user.mapper.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="userMapper" > <!-- 如果POJO的属性名与数据库中表中列名映射一致,也可不写,或是通过在POJO中通过@Column(name = "")将数据库字段注解到POJO属性或方法上保持一致性也可 --> <resultMap id="userMap" type="user" > <id column="id" property="id" jdbcType="BIGINT" /> <result column="username" property="username" jdbcType="VARCHAR" /> <result column="password" property="password" jdbcType="VARCHAR" /> <result column="name" property="name" jdbcType="VARCHAR" /> <result column="sex" property="sex" jdbcType="INTEGER" /> <result column="email" property="email" jdbcType="VARCHAR" /> <result column="tel" property="tel" jdbcType="VARCHAR" /> </resultMap> <sql id="Base_Column_List" > id,username,password,name,sex,email.tel </sql> <!-- 根据id查询 --> <select id="queryById" resultMap="userMap" parameterType="java.lang.Long" > select <include refid="Base_Column_List" /> from b_user where id = #{id,jdbcType=BIGINT} </select> <!-- 查询所有 --> <select id="queryAll" resultMap="userMap"> select <include refid="Base_Column_List" /> from tb_user where 1 = 1 </select> </mapper>
2.5 DAO,BaseMybatisDao.java
/** * * @description:获取sqlSessionTemplate * * @author: liuhongwei */ public class BaseMybatisDao { @Resource public SqlSession sqlSessionTemplate; }
sqlSessionTemplate是Spring提供的操作模板。
2.6 CRUD测试,继承DAO,userDAO.java
/** * * @description: 用户类数据库操作 * * @author: liuhongwei */ @Repository("userDao") public class UserDao extends BaseMybatisDao { /** * 根据id查询用户信息 * @param id * @return */ @Override public Email queryById(Integer id) { return sqlSessionTemplate.selectOne("userMapper.queryById",id); } /** * 查询所有 * @return */ @Override public List<User> queryAll() { return sqlSessionTemplate.selectList("userMapper.queryAll"); }
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