标签:技术 查询语句 oid rem ace github release rman temp
导入相关包:Spring包:Spring架包 MyBatis包:MyBatis架包 整合包:Mybatis-Spring整合包
编写实体类User,实体类的sql映射文件,映射内容如下:
<?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">
<typeAliases>
<package name="com.lxy.entity"/>
</typeAliases>
<mapper namespace="com.lxy.entity.UserMapper">
<select id="selectUsers" resultType="com.lxy.entity.User">
select * from users
</select>
</mapper>
创建实体类的dao接口UserDao和接口的实现类UserDaoImp,在实现类里创建一个sqlSessionTemplate类变量sqlSession,设置sqlSession的set方法。在实现接口的方法中调用sqlSession的selectList方法并返回代码如下:
public class UserDaoImp implements UserDao {
private SqlSessionTemplate sqlSession;
@Override
public List<User> selectUser() {
//参数为映射文件的namespace+查询语句的id
return sqlSession.selectList("com.lxy.entity.UserMapper.selectUsers");
}
public void setSqlSession(SqlSessionTemplate sqlSession) {
this.sqlSession = sqlSession;
}
}
Mybatis工具类要交由spring容器来处理和实例化,不再需要另外编写。此时的项目结构如图:
在Spring的xml配置下编写数据库连接配置,例如:
<?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"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop.xsd">
<!--配置数据源-->
<bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
<property name="driverClassName" value="com.mysql.jdbc.Driver"/>
<property name="url" value="jdbc:mysql://localhost:3306/springExercise"/>
<property name="username" value="root"/>
<property name="password" value="myPassword"/>
</bean>
<!--配置sqlSessionFactory-->
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<property name="dataSource" ref="dataSource" />
<property name="configLocation" value="classpath:mybatis-config.xml" />
</bean>
<!--sqlSessionFactory利用构造器引用了Factory-->
<bean id="sqlSessionTemplate" class="org.mybatis.spring.SqlSessionTemplate">
<constructor-arg index="0" ref="sqlSessionFactory" />
</bean>
<bean id="userDao" class="com.lxy.dao.imp.UserDaoImp">
<property name="sqlSession" ref="sqlSessionTemplate" />
</bean>
编写测试主方法,如:
public class test {
public static void main(String[] args) throws IOException {
ApplicationContext context=new ClassPathXmlApplicationContext("Beans.xml");
UserDao userDao= (UserDao) context.getBean("userDao");
System.out.println(userDao.selectUser().size());
}
}
配置声明式事务,为了使用事务,先修改mapper文件的映射,添加不同的操作:
<mapper namespace="com.lxy.entity.UserMapper">
<select id="selectUsers" resultType="com.lxy.entity.User">
select * from users
</select>
<insert id="add" parameterType="User" useGeneratedKeys="true">
insert into users(name,pwd) values(#{name},#{pwd})
</insert>
<delete id="remove">
deletes from users where id=#{id}
</delete>
</mapper>
需要修改Beans.xml的头部beans配置:
<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"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx.xsd">
再添加事务的和aop的配置:
<!--声明式事务-->
<!--配置事务管理器-->
<bean id="txManger" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<property name="dataSource" ref="dataSource"/>
</bean>
<!--配置事务的通知-->
<tx:advice id="txAdvice" transaction-manager="txManger">
<tx:attributes>
<!--配置哪些方法使用什么样的事务,配置事务的传播特性-->
<!--REQUIRED表示如果没有当前事务就开启一个事务-->
<tx:method name="add" propagation="REQUIRED"/>
<!--带*号匹配所有以remove为开头的方法名字-->
<tx:method name="remove*" propagation="REQUIRED"/>
<!--使用read-only为true,只读就不会提交事务-->
<tx:method name="selectUsers" read-only="true"/>
<tx:method name="*" propagation="REQUIRED"/>
</tx:attributes>
</tx:advice>
<aop:config>
<!--这里的表达式中实际运用时应该配置在service层,这里是因为没有写出service所以就使用dao层-->
<aop:pointcut id="pointCut" expression="execution(* com.lxy.dao.imp.*.*(..))"/>
<aop:advisor pointcut-ref="pointCut" advice-ref="txAdvice"/>
</aop:config>
标签:技术 查询语句 oid rem ace github release rman temp
原文地址:https://www.cnblogs.com/inkqx/p/12316280.html