Spring入門第二十七課
阿新 • • 發佈：2017-05-29
url cati urn ksh base stock XML repo study
聲明式事務
直接上代碼：
db.properties
jdbc.user=root
jdbc.password=logan123
jdbc.driverClass=com.mysql.jdbc.Driver
jdbc.jdbcUrl=jdbc:mysql://localhost:3306/spring
jdbc.initPoolSize=5
jdbc.maxPoolSize=10
applicationContext.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: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/context http://www.springframework.org/schema/context/spring-context-4.3.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.3.xsd"> <context:component-scan base-package="logan.study.spring.tx"></context:component-scan> <!-- 導入資源文件 --> <context:property-placeholder location="classpath:db.properties"/> <!-- 配置C3P0數據源 --> <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource"> <property name="user" value="${jdbc.user}"></property> <property name="password" value="${jdbc.password}"></property> <property name="jdbcUrl" value="${jdbc.jdbcUrl}"></property> <property name="driverClass" value="${jdbc.driverClass}"></property> <property name="initialPoolSize" value="${jdbc.initPoolSize}"></property> <property name="maxPoolSize" value="${jdbc.maxPoolSize}"></property> </bean> <!-- 配置Spring的JDBCTemplate --> <bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate"> <property name="dataSource" ref="dataSource"></property> </bean> <!-- 配置NamedParameterJdbcTemplate,該對象可以使用具名參數，其沒有無參的構造器，所以必須為其構造器指定參數 --> <bean id="namedParameterJdbcTemplate" class="org.springframework.jdbc.core.namedparam.NamedParameterJdbcTemplate"> <constructor-arg ref="dataSource"></constructor-arg> </bean> <!-- 配置事務管理器 --> <bean id="dataSourceTransactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager"> <property name="dataSource" ref="dataSource"></property> </bean> <!-- 啟用事務註解 --> <tx:annotation-driven transaction-manager="transactionManager"/> </beans>
package logan.study.spring.tx; public interface BookShopDao { //根據書號獲取書的單價 public int findBookPriceIsbn(String isbn); //更新書的庫存，使書號對應的庫存-1 public void updateBookStock(String isbn); public void updateUserAccount(String username,int price); }
package logan.study.spring.tx; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.jdbc.core.JdbcTemplate; import org.springframework.stereotype.Repository; @Repository("bookShopDao") public class BookShopDaoImpl implements BookShopDao { @Autowired private JdbcTemplate jdbcTemplate; @Override public int findBookPriceIsbn(String isbn) { // TODO Auto-generated method stub String sql = "SELECT price FROM book WHERE isbn=?"; return jdbcTemplate.queryForObject(sql, Integer.class, isbn); } @Override public void updateBookStock(String isbn) { // TODO Auto-generated method stub //檢查書的庫存是否足夠，若不夠，則拋出異常 String sql2 = "SELECT stock FROM book_stock WHERE isbn = ?"; int stock = jdbcTemplate.queryForObject(sql2, Integer.class, isbn); if(stock == 0){ throw new BookStockException("庫存不足！"); } String sql = "UPDATE book_stock SET stock = stock -1 WHERE isbn = ?"; jdbcTemplate.update(sql, isbn); } @Override public void updateUserAccount(String username, int price) { // TODO Auto-generated method stub //檢查書的庫存是否足夠，若不夠，則拋出異常 String sql2 = "SELECT balance FROM account WHERE username = ?"; int balance = jdbcTemplate.queryForObject(sql2, Integer.class, username); if(balance < price){ throw new UserAccountException("余額不足！"); } String sql = "UPDATE account SET balance = balance - ? WHERE username = ?"; jdbcTemplate.update(sql, price, username); } }
package logan.study.spring.tx; public class BookStockException extends RuntimeException{ public BookStockException() { super(); // TODO Auto-generated constructor stub } public BookStockException(String message, Throwable cause, boolean enableSuppression, boolean writableStackTrace) { super(message, cause, enableSuppression, writableStackTrace); // TODO Auto-generated constructor stub } public BookStockException(String message, Throwable cause) { super(message, cause); // TODO Auto-generated constructor stub } public BookStockException(String message) { super(message); // TODO Auto-generated constructor stub } public BookStockException(Throwable cause) { super(cause); // TODO Auto-generated constructor stub } }
package logan.study.spring.tx; public class UserAccountException extends RuntimeException{ public UserAccountException() { super(); // TODO Auto-generated constructor stub } public UserAccountException(String message, Throwable cause, boolean enableSuppression, boolean writableStackTrace) { super(message, cause, enableSuppression, writableStackTrace); // TODO Auto-generated constructor stub } public UserAccountException(String message, Throwable cause) { super(message, cause); // TODO Auto-generated constructor stub } public UserAccountException(String message) { super(message); // TODO Auto-generated constructor stub } public UserAccountException(Throwable cause) { super(cause); // TODO Auto-generated constructor stub } }
package logan.study.spring.tx; public interface BookShopService { public void purchase(String username, String isbn); }
package logan.study.spring.tx; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Service; import org.springframework.transaction.annotation.Transactional; @Service("bookShopService") public class BookShopServiceImpl implements BookShopService { @Autowired private BookShopDao bookShopDao; //添加事務註解 @Transactional @Override public void purchase(String username, String isbn) { // TODO Auto-generated method stub //1.獲取書的單價 int price = bookShopDao.findBookPriceIsbn(isbn); //2.更新書的庫存 bookShopDao.updateBookStock(isbn); //3.更新用戶余額 bookShopDao.updateUserAccount(username, price); } }
Spring入門第二十七課