spring03：spring整合JDBC和aop事务

落日映苍穹つ 2022-02-12 14:55 331阅读 0赞

一、spring整合JDBC  
1.spring提供了很多模板整合Dao技术  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MDgwNzI0Nw_size_16_color_FFFFFF_t_70]2.spring中提供了一个可以操作数据库的对象.对象封装了jdbc技术.  
　　 JDBCTemplate => JDBC模板对象

与DBUtils中的QueryRunner非常相似.

package com.kankan.jdbctemplate;
    
    import com.mchange.v2.c3p0.ComboPooledDataSource;
    import org.junit.Test;
    import org.springframework.jdbc.core.JdbcTemplate;
    
    import java.beans.PropertyVetoException;
    
    /**
     * @author kankan
     * @creater 2019-04-29 8:02
     */
    public class Demo {
        @Test
        public void fun() throws Exception {
            //0 准备连接池
            ComboPooledDataSource dataSource = new ComboPooledDataSource();
            dataSource.setDriverClass("com.mysql.jdbc.Driver");
            dataSource.setJdbcUrl("jdbc:mysql://localhost:3306/web09");
            dataSource.setUser("root");
            dataSource.setPassword("123");
    
            //1.创建JDBC模板对象
            JdbcTemplate jt = new JdbcTemplate();
    
            jt.setDataSource(dataSource);
    
            //2.书写sql，并执行
            String sql = "insert into category values('c005','看看')";
    
            jt.update(sql);
        }
    }

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3.1 导包  
　　 4+2：4代表：![在这里插入图片描述][20190429102718382.png]

2代表：com.springsource.org.apache.commons.logging-1.1.1.jar、com.springsource.org.apache.log4j-1.2.15.jar（老版本要导入的，导入可以保证一定能运行）

spring-test、spring-aop、junit4类库

c3p0连接池、JDBC驱动

spring-jdbc、spring-tx事务

3.2 准备数据库（两个字段id（自增长）和name即可）  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MDgwNzI0Nw_size_16_color_FFFFFF_t_70 3]  
　　 3.3 书写Dao

package com.kankan.jdbctemplate;
    
    import com.kankan.bean.User;
    import org.springframework.jdbc.core.JdbcTemplate;
    import org.springframework.jdbc.core.RowMapper;
    
    import java.sql.ResultSet;
    import java.sql.SQLException;
    import java.util.List;
    //使用JDBC模板实现增删改查
    public class UserDaoImpl implements UserDao{
    
        private JdbcTemplate jt;
    
        public JdbcTemplate getJt() {
            return jt;
        }
    
        public void setJt(JdbcTemplate jt) {
            this.jt = jt;
        }
    
        @Override
        public void save(User u) {
            String sql = "insert into user values(?,?)";
            jt.update(sql,u.getId(),u.getName());
        }
    
        @Override
        public void delete(Integer id) {
            String sql = "delete from user where id = ?";
            jt.update(sql,id);
        }
    
        @Override
        public void update(User u) {
            String sql = "update user set name=? where id=?";
            jt.update(sql,u.getName(),u.getId());
        }
    
        @Override
        public User getById(Integer id) {
            String sql = "select * from user where id=?";
            return jt.queryForObject(sql, new RowMapper<User>() {
    
                @Override
                public User mapRow(ResultSet resultSet, int arg1) throws SQLException{
                    User u = new User();
                    u.setId(resultSet.getInt("id"));
                    u.setName(resultSet.getString("name"));
                    return u;
                }
            },id);
        }
    
        @Override
        public int getTotalCount() {
            String sql = "select count(*) from user";
            Integer count = jt.queryForObject(sql,Integer.class);
            return count;
        }
    
        @Override
        public List<User> getAll() {
            String sql = "select * from user";
            List<User> list = jt.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;
        }
    }

3.4 spring配置  
　　 依赖关系

<?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">
    
        
        <bean name="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource" >
            <property name="jdbcUrl" value="jdbc:mysql://localhost:3306/user" ></property>
            <property name="driverClass" value="com.mysql.jdbc.Driver" ></property>
            <property name="user" value="root" ></property>
            <property name="password" value="123" ></property>
        </bean>
    
    
        
        <bean name="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate" >
            <property name="dataSource" ref="dataSource"></property>
        </bean>
    
        
        <bean name="userDao" class="com.kankan.jdbctemplate.UserDaoImpl" >
             <property name="jt" ref="jdbcTemplate" ></property>
            
        </bean>
    
    </beans>

3.5 测试

package com.kankan.jdbctemplate;
    
    import com.kankan.bean.User;
    import com.mchange.v2.c3p0.ComboPooledDataSource;
    import org.junit.Test;
    import org.junit.runner.RunWith;
    import org.springframework.jdbc.core.JdbcTemplate;
    import org.springframework.test.context.ContextConfiguration;
    import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
    
    import javax.annotation.Resource;
    import java.beans.PropertyVetoException;
    
    /**
     * @author kankan
     * @creater 2019-04-29 8:02
     */
    @RunWith(SpringJUnit4ClassRunner.class)
    @ContextConfiguration("classpath:spring-config.xml")
    public class Demo {
    
        @Resource(name="userDao")
        private UserDao ud;
    
        /*@Test
        public void fun() throws Exception {
            //0 准备连接池
            ComboPooledDataSource dataSource = new ComboPooledDataSource();
            dataSource.setDriverClass("com.mysql.jdbc.Driver");
            dataSource.setJdbcUrl("jdbc:mysql://localhost:3306/user");
            dataSource.setUser("root");
            dataSource.setPassword("123");
    
            //1.创建JDBC模板对象
            JdbcTemplate jt = new JdbcTemplate();
    
            jt.setDataSource(dataSource);
    
            //2.书写sql，并执行
            String sql = "insert into user values(2,'看看')";
    
            jt.update(sql);
        }*/
    
        @Test
        public void fun1() throws Exception {
            User u = new User();
            u.setId(3);
            u.setName("tom");
            ud.save(u);
        }
    
        @Test
        public void fun2() throws Exception {
            User u = new User();
            u.setId(3);
            u.setName("miss");
            ud.update(u);
        }
    
        @Test
        public void fun3() throws Exception {
           ud.delete(3);
        }
    
        @Test
        public void fun4() throws Exception {
            System.out.println(ud.getById(2));
        }
    
        @Test
        public void fun5() throws Exception {
            System.out.println(ud.getTotalCount());
        }
    
        @Test
        public void fun6() throws Exception {
            System.out.println(ud.getAll());
        }
    }

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![在这里插入图片描述][20190429103249820.png]  
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4.进阶内容  
　　 4.1 JDBCDaoSupport

public class UserDaoImpl extends JdbcDaoSupport

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package com.kankan.jdbctemplate;
    
    import com.kankan.bean.User;
    import org.springframework.jdbc.core.JdbcTemplate;
    import org.springframework.jdbc.core.RowMapper;
    import org.springframework.jdbc.core.support.JdbcDaoSupport;
    
    import java.sql.ResultSet;
    import java.sql.SQLException;
    import java.util.List;
    //使用JDBC模板实现增删改查
    public class UserDaoImpl extends JdbcDaoSupport implements UserDao{
    
        //private JdbcTemplate jt;
    
        /*public JdbcTemplate getJt() {
            return super.getJdbcTemplate();
        }
    
        public void setJt(JdbcTemplate jt) {
            this.jt = jt;
        }*/
    
        @Override
        public void save(User u) {
            String sql = "insert into user values(?,?)";
            super.getJdbcTemplate().update(sql,u.getId(),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=?";
            return super.getJdbcTemplate().queryForObject(sql, new RowMapper<User>() {
    
                @Override
                public User mapRow(ResultSet resultSet, int arg1) throws SQLException{
                    User u = new User();
                    u.setId(resultSet.getInt("id"));
                    u.setName(resultSet.getString("name"));
                    return u;
                }
            },id);
        }
    
        @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;
        }
    }

<?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">
    
        
        <bean name="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource" >
            <property name="jdbcUrl" value="jdbc:mysql://localhost:3306/user" ></property>
            <property name="driverClass" value="com.mysql.jdbc.Driver" ></property>
            <property name="user" value="root" ></property>
            <property name="password" value="123" ></property>
        </bean>
    
    
        
    
    
        
        <bean name="userDao" class="com.kankan.jdbctemplate.UserDaoImpl" >
             
            <property name="dataSource" ref="dataSource" ></property>
        </bean>
    
    </beans>

4.1 读取外部的Properties配置  
　　 db.properties 注意加前缀（更好区分，防止重名）

<context:property-placeholder location="classpath:db.properties"/>
    
        
        <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>

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二、使用注解配置spring  
　　1.事务回顾  
　　 事务特性:acid

事务并发问题：脏读、不可重复读、幻读

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.spring封装了事务管理代码  
　　 事务操作：打开事务、提交事务、回滚事务

事务操作对象  
　　 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

2.1 PlatformTransactionManager 接口  
　　 DataSourceTransactionManager

HibernateTransitionmanager

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

2.2 spring管理事务的属性介绍  
　　 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

是否只读：true 只读、false 可操作

事务的传播行为：  
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<?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"
           xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">
    
        
        <context:property-placeholder location="classpath:db.properties"/>
    
        
        <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>
    
        
        <bean name="accountDao" class="com.kankan.dao.AccountDaoImpl" >
             
            <property name="dataSource" ref="dataSource" ></property>
        </bean>
    
        
        <bean name="accountService" class="com.kankan.service.AccountServiceImpl" >
            
            <property name="ad" ref="accountDao" ></property>
        </bean>
    
    
    </beans>

package com.kankan.dao;
    
    /**
     * @author kankan
     * @creater 2019-04-30 15:00
     */
    public interface AccountDao {
    
        //加钱
        void addMoney(Integer id,Double money);
    
        //减钱
        void delMoney(Integer id,Double money);
    }

package com.kankan.dao;
    
    import org.springframework.jdbc.core.support.JdbcDaoSupport;
    
    /**
     * @author kankan
     * @creater 2019-04-30 15:07
     */
    public class AccountDaoImpl extends JdbcDaoSupport implements AccountDao {
    
        @Override
        public void addMoney(Integer id, Double money) {
            getJdbcTemplate().update("UPDATE t_account SET money = money+? WHERE id=?",money,id);
    
        }
    
        @Override
        public void delMoney(Integer id, Double money) {
            getJdbcTemplate().update("UPDATE t_account SET money = money-? WHERE id=?",money,id);
        }
    }

package com.kankan.service;
    
    /**
     * @author kankan
     * @creater 2019-04-30 15:32
     */
    public interface AccountService {
    
        //转账方法
        void transfer(Integer from,Integer to,Double money);
    
    }

package com.kankan.service;
    
    import com.kankan.dao.AccountDao;
    
    /**
     * @author kankan
     * @creater 2019-04-30 15:33
     */
    public class AccountServiceImpl implements AccountService {
    
        private AccountDao ad;
    
        public AccountDao getAd() {
            return ad;
        }
    
        public void setAd(AccountDao ad) {
            this.ad = ad;
        }
    
        @Override
        public void transfer(Integer from, Integer to, Double money) {
    
            //加钱
            ad.addMoney(from,money);
    
            //减钱
            ad.delMoney(to,money);
    
        }
    }

jdbc.jdbcUrl=jdbc:mysql://localhost:3306/user
    jdbc.driverClass=com.mysql.jdbc.Driver
    jdbc.user=root
    jdbc.password=123

package com.kankan.tx;
    
    import com.kankan.service.AccountService;
    import org.junit.Test;
    import org.junit.runner.RunWith;
    import org.springframework.test.context.ContextConfiguration;
    import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
    
    import javax.annotation.Resource;
    
    /**
     * @author kankan
     * @creater 2019-04-30 15:52
     */
    @RunWith(SpringJUnit4ClassRunner.class)
    @ContextConfiguration("classpath:spring-config.xml")
    public class Demo {
        @Resource(name = "accountService")
        private AccountService as;
    
        @Test
        public void fun1(){
            as.transfer(1,2,100d);
        }
    }

![在这里插入图片描述][20190430162305795.png]  
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3.spring管理事务方式  
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3.1 编码式（了解）  
　　 3.1.1 将核心事务管理器配置到spring容器

<bean name="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
            
            
            <property name="dataSource" ref="dataSource"></property>
        </bean>

3.1.2 配置TransactionTemplate模板

<bean name="transactionTemplate" class="org.springframework.transaction.support.TransactionTemplate">
            
            <property name="transactionManager" ref="transactionManager"></property>
        </bean>

3.1.3 将事务模板注入Service

<bean name="accountService" class="com.kankan.service.AccountServiceImpl" >
            
            
            
            <property name="ad" ref="accountDao" ></property>
    
            
            <property name="tt" ref="transactionTemplate"></property>
        </bean>

3.1.4 在Service中调用模板

package com.kankan.service;
    
    import com.kankan.dao.AccountDao;
    import org.springframework.transaction.TransactionStatus;
    import org.springframework.transaction.support.TransactionCallbackWithoutResult;
    import org.springframework.transaction.support.TransactionTemplate;
    
    /**
     * @author kankan
     * @creater 2019-04-30 15:33
     */
    public class AccountServiceImpl implements AccountService {
    
        private AccountDao ad;
    
        private TransactionTemplate tt;
    
        public TransactionTemplate getTt() {
            return tt;
        }
    
        public void setTt(TransactionTemplate tt) {
            this.tt = tt;
        }
    
        public AccountDao getAd() {
            return ad;
        }
    
        public void setAd(AccountDao ad) {
            this.ad = ad;
        }
    
        //匿名内部类访问外部要加final
        @Override
        public void transfer(final Integer from, final Integer to, final Double money) {
    
            //封装好事务函数
            //打开事务
            //调用doInTransactionWithoutResult -- 出异常会回滚事务
            //提交事务
            tt.execute(new TransactionCallbackWithoutResult() {
                @Override
                protected void doInTransactionWithoutResult(TransactionStatus transactionStatus) {
                    //加钱
                    ad.addMoney(from,money);
    
                    int i = 1/0;//触发错误，验证代码是否正确
    
                    //减钱
                    ad.delMoney(to,money);
                }
            });
        }
    }

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事务中有异常发生时候：  
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3.2 xml配置(aop)  
　　 3.2.1 导包  
　　 aop、aspect、aop联盟和weaving织入包

3.2.2 导入新的约束(tx)  
![在这里插入图片描述][20190430170517947.png]  
beans: 最基本  
　　 context:读取properties配置  
　　 aop:配置aop  
　　 tx:配置事务通知  
3.2.3 配置通知

<tx:advice id="txAdvice" transaction-manager="transactionManager" >
            <tx:attributes>
                
                <tx:method name="save*" isolation="REPEATABLE_READ" propagation="REQUIRED" read-only="false" />
                <tx:method name="persist*" isolation="REPEATABLE_READ" propagation="REQUIRED" read-only="false" />
                <tx:method name="update*" isolation="REPEATABLE_READ" propagation="REQUIRED" read-only="false" />
                <tx:method name="modify*" isolation="REPEATABLE_READ" propagation="REQUIRED" read-only="false" />
                <tx:method name="delete*" isolation="REPEATABLE_READ" propagation="REQUIRED" read-only="false" />
                <tx:method name="remove*" isolation="REPEATABLE_READ" propagation="REQUIRED" read-only="false" />
                <tx:method name="get*" isolation="REPEATABLE_READ" propagation="REQUIRED" read-only="true" />
                <tx:method name="find*" isolation="REPEATABLE_READ" propagation="REQUIRED" read-only="true" />
                <tx:method name="transfer" isolation="REPEATABLE_READ" propagation="REQUIRED" read-only="false" />
            </tx:attributes>
        </tx:advice>

3.2.4 配置将通知织入目标

<aop:config  >
            
            <aop:pointcut expression="execution(* com.kankan.service.*ServiceImpl.*(..))" id="txPc"/>
            
            <aop:advisor advice-ref="txAdvice" pointcut-ref="txPc" />
        </aop:config>

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![在这里插入图片描述][20190430221844143.png]  
3.3 注解配置(aop)  
　　 导包、tx约束和xml配置(aop)相同  
　　 3.3.1 开启注解管理事务

<tx:annotation-driven/>

3.3.2 使用注解

package com.kankan.tx;
    
    import com.kankan.service.AccountService;
    import org.junit.Test;
    import org.junit.runner.RunWith;
    import org.springframework.test.context.ContextConfiguration;
    import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
    
    import javax.annotation.Resource;
    
    /**
     * @author kankan
     * @creater 2019-04-30 15:52
     */
    @RunWith(SpringJUnit4ClassRunner.class)
    @ContextConfiguration("classpath:applicationContext2.xml")
    public class Demo1 {
        @Resource(name = "accountService")
        private AccountService as;
    
        @Test
        public void fun1(){
            as.transfer(1,2,100d);
        }
    }

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