Spring——spring整合JDBC，spring中aop事务

spring整合JDBC

spring提供了很多模板整合Dao技术

其中JdbcTemplate封装了JDBC技术，其与DBUtils中的QueryRunner非常相似.

与Web结合步骤：

1、导包

4+2
spring-test
spring-aop
junit4类库
c3p0连接池
JDBC驱动
spring-jdbc
spring-tx事务

2、书写Dao

获取JdbcTemplate对象的方法

方式一：

继承JdbcDaoSupport类，使用super.getJdbcTemplate()获取

方式二：

定义private JdbcTemplate jt;字段，然后提供set方法，由Spring帮忙注入

public class UserDaoImpl extends JdbcDaoSupport implements UserDao{

//    private JdbcTemplate jt;

//    public void setJt(JdbcTemplate jt) {
//        this.jt = jt;
//    }

    @Override
    public void save(User u) {

        String sql = "insert into user values (null,?) ";
        super.getJdbcTemplate().update(sql,u.getName());

    }

    @Override
    public void delete(Integer id) {
        String sql = "delete from user where id=?";
        super.getJdbcTemplate().update(sql,id);

    }

    @Override
    public void update(User u) {
        String sql = "update user set name=? where id=?";
        super.getJdbcTemplate().update(sql,u.getName(),u.getId());

    }

    @Override
    public User getById(Integer id) {
        String sql = "select * from user where id=?";
        User u = super.getJdbcTemplate().queryForObject(sql, new RowMapper<User>() {
            @Override
            public User mapRow(ResultSet resultSet, int i) throws SQLException {
                User u = new User();
                u.setId(resultSet.getInt("id"));
                u.setName(resultSet.getString("name"));
                return u;
            }
        }, id);

        return u;
    }


    @Override
    public int getTotalCount() {
        String sql = "select count(*) from user";
        Integer count = super.getJdbcTemplate().queryForObject(sql, Integer.class);

        return count;
    }

    @Override
    public List<User> getAll() {
        String sql = "select * from user";
        List<User> list = super.getJdbcTemplate().query(sql, new RowMapper<User>() {

            @Override
            public User mapRow(ResultSet resultSet, int i) throws SQLException {
                User u = new User();
                u.setId(resultSet.getInt("id"));
                u.setName(resultSet.getString("name"));
                return u;
            }
        });

        return list;
    }
}

3、书写配置文件

方式一：

<!--1.创建连接池对象-->
<bean name="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
    <property name="DriverClass" value="com.mysql.jdbc.Driver"></property>
    <property name="JdbcUrl" value="jdbc:mysql:///xingedb"></property>
    <property name="User" value="root"></property>
    <property name="Password" value="710130520a"></property>
</bean>
<!--2.将UserDaoImpl放入Spring容器中，由于继承了JdbcDaoSupport类，所以要注入连接池对象-->
<bean name="dao" class="cn.x5456.JDBC.impl.UserDaoImpl">
    <property name="dataSource" ref="dataSource"></property>
</bean>

方式二：

<!--1.创建连接池对象-->
<bean name="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
    <property name="DriverClass" value="com.mysql.jdbc.Driver"></property>
    <property name="JdbcUrl" value="jdbc:mysql:///xingedb"></property>
    <property name="User" value="root"></property>
    <property name="Password" value="710130520a"></property>
</bean>
<!--2.创建JDBC模板对象,并加入连接池对象-->
<bean name="jt" class="org.springframework.jdbc.core.JdbcTemplate">
    <property name="dataSource" ref="dataSource"></property>
</bean>
<!--3.创建UserDaoImpl对象，将JDBC模板对象加入其中-->
<bean name="dao" class="cn.x5456.JDBC.impl.UserDaoImpl">
    <property name="jt" ref="jt"></property>
</bean>

Spring中Xml配置文件读取外部Properties配置

db.properties

#加一个（任意）前缀，防止与关键字冲突
jdbc.jdbcUrl=jdbc:mysql:///xingedb
jdbc.driverClass=com.mysql.jdbc.Driver
jdbc.user=root
jdbc.password=710130520a

.xml

<!-- 指定spring读取db.properties配置 -->
<context:property-placeholder location="classpath:db.properties"  />

<!-- 1.将连接池放入spring容器 -->
<!-- 使用${}读取配置文件中的信息-->
<bean name="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource" >
	<property name="jdbcUrl" value="${jdbc.jdbcUrl}" ></property>
	<property name="driverClass" value="${jdbc.driverClass}" ></property>
	<property name="user" value="${jdbc.user}" ></property>
	<property name="password" value="${jdbc.password}" ></property>
</bean>

spring中aop事务

事务操作实际上就是：打开事务，提交事务，回滚事务三种

因为在不同平台,操作事务的代码各不相同，spring提供了一个接口：

PlatformTransactionManager接口

　　|-DataSourceTransactionManager　　操作JDBC

　　|-HibernateTransitionmanager　　操作Hibernate

注意：在spring中玩事务管理，最为核心的对象就是TransactionManager对象

spring管理事务的属性介绍

1）事务的隔离级别：

• 1 读未提交
• 2 读已提交
• 4 可重复读
• 8 串行化

2）是否只读：

• true 只读
• false 可操作

3）事务的传播行为：

AOP管理事务——XML配置文件

1、导包

4+2

aop
aspect

aop联盟
weaving织入包

2、导入新的约束(tx)

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
　　xmlns="http://www.springframework.org/schema/beans" 　　<!--beans：最基本-->
　　xmlns:context="http://www.springframework.org/schema/context" 　　<!--context：读取properties配置+扫描注解-->
　　xmlns:aop="http://www.springframework.org/schema/aop" 　　<!--aop：配置AOP-->
　　xmlns:tx="http://www.springframework.org/schema/tx" 　　<!--tx：配置事务-->
　　xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.2.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.2.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.2.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.2.xsd ">

3、配置文件

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns="http://www.springframework.org/schema/beans"
       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-4.2.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.2.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.2.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.2.xsd ">


    <!--1.配置读取properties文件-->
    <context:property-placeholder location="db.properties"></context:property-placeholder>

    <!--2.配置连接池-->
    <bean name="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
        <property name="DriverClass" value="${jdbc.driverClass}"></property>
        <property name="JdbcUrl" value="${jdbc.jdbcUrl}"></property>
        <property name="User" value="${jdbc.user}"></property>
        <property name="Password" value="${jdbc.password}"></property>
    </bean>

    <!--3.配置目标对象accountService-->
        <!--1 配置Dao-->
    <bean name="accountDao" class="cn.x5456.dao.AccountDaoImpl" >
        <property name="dataSource" ref="dataSource" ></property>
    </bean>
        <!-- 2 配置Service，将Dao注入-->
    <bean name="accountService" class="cn.x5456.service.AccountServiceImpl" >
        <property name="ad" ref="accountDao" ></property>
    </bean>

    <!-- 4.配置事务核心管理器,封装了所有事务操作. 依赖于连接池 -->
    <bean name="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager" >
        <property name="dataSource" ref="dataSource" ></property>
    </bean>

    <!--5.配置（官方给好的）事务通知-->
    <tx:advice id="txAdvice" transaction-manager="transactionManager" >
        <tx:attributes>
            <tx:method name="transfer" isolation="REPEATABLE_READ" propagation="REQUIRED" read-only="false" />
        </tx:attributes>
    </tx:advice>

    <!--6.织入-->
    <aop:config>
        <!--1 配置织入点-->
        <aop:pointcut id="txPc" expression="execution(* cn.x5456.service.*ServiceImpl.*(..))"></aop:pointcut>
        <!--2 直接用别人写好的通知，可以直接使用aop:advisor进行配置-->
        <aop:advisor advice-ref="txAdvice" pointcut-ref="txPc"></aop:advisor>
    </aop:config>

//@Transactional(isolation=Isolation.REPEATABLE_READ,propagation=Propagation.REQUIRED,readOnly=true)
public class AccountServiceImpl implements AccountService {

    private AccountDao ad ;

    //@Transactional(isolation=Isolation.REPEATABLE_READ,propagation=Propagation.REQUIRED,readOnly=false)
    public void transfer(final Integer from,final Integer to,final Double money) {
        //减钱
        ad.decreaseMoney(from, money);
//        int i = 1/0;
        //加钱
        ad.increaseMoney(to, money);
    }


    public void setAd(AccountDao ad) {
        this.ad = ad;
    }

}

public class AccountDaoImpl extends JdbcDaoSupport implements AccountDao  {

    @Override
    public void increaseMoney(Integer id, Double money) {
        
        getJdbcTemplate().update("update t_account set money = money+? where id = ? ", money,id);
        
    }

    @Override
    public void decreaseMoney(Integer id, Double money) {

        getJdbcTemplate().update("update t_account set money = money-? where id = ? ", money,id);
    }

}

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration("classpath:spring-config.xml")
public class demo {

    @Resource(name = "accountService")
    private AccountService service;

    @Test
    public void func(){
        service.transfer(1,2,100d);
    }
}

AOP管理事务——注解配置

注解配置文件

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns="http://www.springframework.org/schema/beans"
       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-4.2.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.2.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.2.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.2.xsd ">


    <!--1.配置读取properties文件-->
    <context:property-placeholder location="db.properties"></context:property-placeholder>

    <!--2.配置连接池-->
    <bean name="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
        <property name="DriverClass" value="${jdbc.driverClass}"></property>
        <property name="JdbcUrl" value="${jdbc.jdbcUrl}"></property>
        <property name="User" value="${jdbc.user}"></property>
        <property name="Password" value="${jdbc.password}"></property>
    </bean>

    <!--3.配置目标对象accountService-->
        <!--1 配置Dao-->
    <bean name="accountDao" class="cn.x5456.dao.AccountDaoImpl" >
        <property name="dataSource" ref="dataSource" ></property>
    </bean>
        <!-- 2 配置Service，将Dao注入-->
    <bean name="accountService" class="cn.x5456.service.AccountServiceImpl" >
        <property name="ad" ref="accountDao" ></property>
    </bean>

    <!-- 4.配置事务核心管理器,封装了所有事务操作. 依赖于连接池 -->
    <bean name="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager" >
        <property name="dataSource" ref="dataSource" ></property>
    </bean>

    <!-- 5.开启使用注解管理aop事务 -->
    <tx:annotation-driven/>