1.Spring整合JDBC
(1)spring提供了很多模板整合Dao技術
(2)spring中提供了一個可以操作數據庫的對象.對象封裝了jdbc技術.
JDBCTemplate => JDBC模板對象
與DBUtils中的QueryRunner非常相似.
@Test
public void fun1() throws Exception{
//0.準備連接池
ComboPooledDataSource dataSource = new ComboPooledDataSource();
dataSource.setDriverClass("com.mysql.jdbc.Driver");
dataSource.setJdbcUrl("jdbc:mysql:///test?useUnicode=true&characterEncoding=UTF-8");
dataSource.setUser("root");
dataSource.setPassword("root");
//1.創建jdbc模板對象
JdbcTemplate jt = new JdbcTemplate(dataSource);
//2.寫sql
String sql = "insert into t_user values(null,'王小二')";
jt.update(sql);
}
(3)步驟
1.導包
2.準備數據庫
3.書寫DAO
package cn.itcast.a_jdbctemplete;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.List;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.jdbc.core.RowMapper;
import org.springframework.jdbc.core.support.JdbcDaoSupport;
import cn.itcast.bean.User;
//使用Jdbc模板實現增刪改查
public class UserDaoImpl extends JdbcDaoSupport implements UserDao{
//增加
public void save(User user) {
String sql = "insert into t_user values(null,?)";
super.getJdbcTemplate().update(sql, user.getName());
}
//刪除
public void delete(Integer id) {
String sql = "delete from t_user where id=?";
super.getJdbcTemplate().update(sql, id);
}
//修改
public void update(User user) {
String sql = "update t_user set name=? where id=?";
super.getJdbcTemplate().update(sql,user.getName(),user.getId());
}
//根據用戶Id進行查詢
public User getById(Integer id) {
String sql = "select * from t_user where id=?";
return super.getJdbcTemplate().queryForObject(sql, new RowMapper<User>(){
public User mapRow(ResultSet rs, int arg1) throws SQLException {
User u = new User();
u.setId(rs.getInt("id"));
u.setName(rs.getString("name"));
return u;
}
}, id);
}
//查詢用戶總數量
public int getTotal() {
String sql = "select count(*) from t_user";
Integer count = super.getJdbcTemplate().queryForObject(sql, Integer.class);
return count;
}
//查詢用戶集合
public List<User> getAll() {
String sql = "select * from t_user";
List<User> list = super.getJdbcTemplate().query(sql, new RowMapper<User>(){
public User mapRow(ResultSet rs, int arg1) throws SQLException {
User u = new User();
u.setId(rs.getInt("id"));
u.setName(rs.getString("name"));
return u;
}
});
return list;
}
}
4.spring配置
依賴關係
<?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" 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 ">
<!-- 指定spring讀取db.properties配置 -->
<context:property-placeholder location="classpath:db.properties" />
<!-- 1.將連接池放入spring容器 -->
<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>
<!-- 2.將JDBCTemplate放入spring容器 -->
<bean name="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate" >
<property name="dataSource" ref="dataSource" ></property>
</bean>
<!-- 3.將UserDao放入spring容器 -->
<bean name="userDao" class="cn.itcast.a_jdbctemplate.UserDaoImpl" >
<!-- <property name="jt" ref="jdbcTemplate" ></property> -->
<property name="dataSource" ref="dataSource" ></property>
</bean>
</beans>
5.測試
package cn.itcast.a_jdbctemplete;
import java.util.List;
import javax.annotation.Resource;
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 cn.itcast.bean.User;
import com.mchange.v2.c3p0.ComboPooledDataSource;
//演示jdbc模板
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration("classpath:applicationContext.xml")
public class Demo {
@Resource(name="userDao")
private UserDao ud;
@Test
public void fun2(){
User user = new User(null, "李斯");
ud.save(user);
}
@Test
public void fun3(){
User user = new User();
user.setId(12);
user.setName("黃老九");
ud.update(user);
}
@Test
public void fun4(){
ud.delete(10);
}
@Test
public void fun5(){
User user = ud.getById(6);
System.out.println(user);
}
@Test
public void fun6(){
int count = ud.getTotal();
System.out.println(count);
}
@Test
public void fun7(){
List<User> list = ud.getAll();
for (User user : list) {
System.out.println(user);
}
}
}
(4)進階內容
1.JDBCDaoSupport
public class UserDaoImpl extends JdbcDaoSupport implements UserDao{}
<!-- 3.將userDao放入spring容器管理 -->
<bean name="userDao" class="cn.itcast.a_jdbctemplete.UserDaoImpl">
<!-- <property name="jt" ref="jdbcTemplete"></property> -->
<property name="dataSource" ref="dataSource"></property>
</bean>
2.讀取外部的Properties配置
#注意加前綴db.properties
jdbc.jdbcUrl=jdbc:mysql://localhost:3306/test?useUnicode=true&&characterEncoding=utf8
jdbc.driverClass=com.mysql.jdbc.Driver
jdbc.user=root
jdbc.password=root
<!-- 指定spring讀取db.properties配置 -->
<context:property-placeholder location="classpath:db.properties" />
<!-- 1.將連接池放入spring容器 -->
<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>
2.Spring中AOP事務
(1)事務
1.事務特性:acid
2.事務併發問題
髒讀
不可重複讀
幻讀
3.事務的隔離級別
1:讀未提交
2:讀已提交
4:可重複讀
8:串行化
(2)spring封裝了事務管理代碼
1.事務操作
打開事務
提交事務
回滾事務
2.事務操作對象
a>因爲在不同平臺,操作事務的代碼各不相同.spring提供了一個接口
b>PlatformTransactionManager 接口
DataSourceTransactionManager
HibernateTransitionmanager
注意:在spring中玩事務管理.最爲核心的對象就是TransactionManager對象
c>spring管理事務的屬性介紹
事務的隔離級別
1:讀未提交
2:讀已提交
4:可重複讀
8:串行化
是否只讀
true 只讀
false 可操作
事務的傳播行爲
(3)spring管理事務方式
1.編碼式
a.將核心事務管理器配置到spring容器
<!-- 事務核心管理器,封裝了所有事務操作,依賴於連接池 -->
<bean name="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<property name="dataSource" ref="dataSource"></property>
</bean>
b.配置TransactionTemplate模板
<!-- 事務模板對象 -->
<bean name="transactionTemplate" class="org.springframework.transaction.support.TransactionTemplate">
<property name="transactionManager" ref="transactionManager"></property>
</bean>
c.將事務模板注入Service
<!-- 3.service -->
<!-- 將事務模板對象注入到service中 -->
<bean name="accountService" class="cn.itcast.dao.AccountServiceImpl">
<property name="accountDao" ref="accountDao"></property>
<property name="transactionTemplate" ref="transactionTemplate"></property>
</bean>
d.在Service中調用模板
public void transfer(Integer from,Integer to,Double money) {
//減錢
accountDao.descreaseMoney(from, money);
//int a = 1/0;
//加錢
accountDao.increaseMoney(to, money);
}
2.xml配置(aop)
a.導包
b.導入新的約束(tx)
beans: 最基本
context:讀取properties配置
aop:配置aop
tx:配置事務通知
c.配置通知
<!-- 配置事務通知 -->
<tx:advice id="txAdvice" transaction-manager="transactionManager">
<tx:attributes>
<!--以方法爲 單位,指定方法應用什麼事務屬性
isolation:隔離級別
propagation:傳播行爲
read-only:是否只讀
-->
<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>
d.配置將通知織入目標
<!-- 配置織入 -->
<aop:config>
<!-- 配置切點表達式 -->
<aop:pointcut expression="execution(* cn.itcast.dao.*ServiceImpl.*(..))" id="txpc"/>
<!-- 配置切面
通知advice-ref + 切點pointcut-ref -->
<aop:advisor advice-ref="txAdvice" pointcut-ref="txpc"/>
</aop:config>
3.註解配置(aop)
a.導包
b.導入新的約束(tx)
c.開啓註解管理事務
<!-- 開啓使用註解管理事務 -->
<tx:annotation-driven/>
d.使用註解
@Transactional(isolation=Isolation.REPEATABLE_READ,propagation=Propagation.REQUIRED,readOnly=false)
public class AccountServiceImpl implements AccountService{
@Transactional(isolation=Isolation.REPEATABLE_READ,propagation=Propagation.REQUIRED,readOnly=true)
public void transfer(Integer from,Integer to,Double money) {