接着上篇
一、准备工作
修改pom.xml文件
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>com.github.carter659</groupId> <artifactId>spring06</artifactId> <version>0.0.1-SNAPSHOT</version> <packaging>jar</packaging> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>1.4.2.RELEASE</version> </parent> <name>spring06</name> <url>http://maven.apache.org</url> <properties> <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> <java.version>1.8</java.version> </properties> <dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-devtools</artifactId> <optional>true</optional> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-thymeleaf</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-data-jpa</artifactId> </dependency> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> </dependency> <dependency> <groupId>commons-dbcp</groupId> <artifactId>commons-dbcp</artifactId> </dependency> </dependencies> <build> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> </plugin> </plugins> </build> </project>
添加src/resources/application.properties文件
spring.datasource.initialize=false spring.datasource.url=jdbc:mysql://localhost:3306/demo spring.datasource.username=root spring.datasource.password= spring.datasource.driver-class-name=com.mysql.jdbc.Driver
添加src/resources/templates/index.html文件
<!DOCTYPE html> <html xmlns:th="http://www.thymeleaf.org"> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /> <title>玩转spring boot——结合JPA</title> <script src="//cdn.bootcss.com/angular.js/1.5.6/angular.min.js"></script> <script type="text/javascript"> /*<![CDATA[*/ var app = angular.module('app', []); app.controller('MainController', function($rootScope, $scope, $http) { $scope.data = {}; $scope.rows = []; //添加 $scope.add = function() { $scope.data = { no : 'No.1234567890', quantity : 100, 'date' : '2017-01-01' }; } //保存 $scope.save = function() { $http({ url : '/save', method : 'POST', data : $scope.data }).success(function(r) { //保存成功后刷新 window.location.reload(); }); } //初始化载入数据 $http({ url : '/findAll', method : 'POST' }).success(function(rows) { for ( var i in rows) { var row = rows[i]; $scope.rows.push(row); } }); }); /*]]>*/ </script> </head> <body ng-app="app" ng-controller="MainController"> <h1>玩转spring boot——JPA事务</h1> <h4> <a href="http://www.cnblogs.com/GoodHelper/">from 刘冬的博客</a> </h4> <input type="button" value="添加" ng-click="add()" /> <input type="button" value="保存" ng-click="save()" /> <br /> <br /> <h3>订单信息：</h3> <input type="hidden" ng-model="data.id" /> <table cellspacing="1" style="background-color: #a0c6e5"> <tr> <td>编号：</td> <td><input ng-model="data.no" /></td> <td>日期：</td> <td><input ng-model="data.date" /></td> <td>数量：</td> <td><input ng-model="data.quantity" /></td> </tr> </table> <br /> <h3>订单列表：</h3> <table cellspacing="1" style="background-color: #a0c6e5"> <tr ng-repeat="row in rows" bgcolor='#F4FAFF'> <td>{{row.no}}</td> <td>{{row.date}}</td> <td>{{row.quantity}}</td> </tr> </table> <br /> <a href="http://www.cnblogs.com/GoodHelper/">点击访问原版博客</a> </body> </html>
同上篇的Order类
package com.github.carter659.spring06; import java.util.Date; import javax.persistence.Column; import javax.persistence.Entity; import javax.persistence.GeneratedValue; import javax.persistence.Id; import javax.persistence.Table; import javax.persistence.Temporal; import javax.persistence.TemporalType; import org.hibernate.annotations.GenericGenerator; /** * 博客出处：http://www.cnblogs.com/GoodHelper/ * * @author 刘冬 * */ @Entity @Table(name = "t_order") public class Order { @Id @GeneratedValue(generator = "uuid") @GenericGenerator(name = "uuid", strategy = "uuid2") @Column(name = "order_id", length = 36) public String id; @Column(name = "order_no", length = 50) public String no; @Temporal(TemporalType.DATE) @Column(name = "order_date") public Date date; @Column(name = "quantity") public int quantity; /** * 省略 get set */ }
新建实现JpaRepository的OrderRepository接口
package com.github.carter659.spring06; import org.springframework.data.jpa.repository.JpaRepository; /** * 博客出处：http://www.cnblogs.com/GoodHelper/ * * @author 刘冬 * */ public interface OrderRepository extends JpaRepository<Order, String> { }
新建OrderDao类
package com.github.carter659.spring06; import java.util.List; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Repository; import com.mysql.jdbc.StringUtils; @Repository public class OrderDao { @Autowired private OrderRepository orderRepository; /** * 获取全部 * * @return */ public List<Order> findAll() { return orderRepository.findAll(); } /** * 持久化 * * @param entity * @return */ public void save(Order entity) throws Exception { // 持久化 orderRepository.save(entity); // 如果持久化成功，就抛出异常。如果开启事务，那么刚才持久化的数据应回滚 if (!StringUtils.isNullOrEmpty(entity.id)) throw new Exception("测试无法持久化第一条数据的异常"); } }
假设：当成功insert一条数据后，抛出异常。如果事务生效，则数据会回滚。反之，则不回滚。
控制器：MainController
package com.github.carter659.spring06; import java.text.SimpleDateFormat; import java.util.Date; import java.util.HashMap; import java.util.Map; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.beans.propertyeditors.CustomDateEditor; import org.springframework.stereotype.Controller; import org.springframework.web.bind.WebDataBinder; import org.springframework.web.bind.annotation.GetMapping; import org.springframework.web.bind.annotation.InitBinder; import org.springframework.web.bind.annotation.PostMapping; import org.springframework.web.bind.annotation.RequestBody; import org.springframework.web.bind.annotation.ResponseBody; /** * 博客出处：http://www.cnblogs.com/GoodHelper/ * * @author 刘冬 * */ @Controller public class MainController { @Autowired private OrderDao orderDao; /** * 处理日期类型 * * @param binder */ @InitBinder public void initBinder(WebDataBinder binder) { SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd"); dateFormat.setLenient(false); binder.registerCustomEditor(Date.class, new CustomDateEditor(dateFormat, true)); } @GetMapping("/") public String index() { return "index"; } /** * 持久化 * * @param entity * @return */ @PostMapping("/save") public @ResponseBody Map<String, Object> save(@RequestBody Order entity) { Map<String, Object> result = new HashMap<>(); try { orderDao.save(entity); result.put("success", true); } catch (Exception e) { result.put("success", false); } return result; } /** * 获取全部 * * @return */ @PostMapping("/findAll") public @ResponseBody Object findAll() { return orderDao.findAll(); } }
程序入口：App.java
package com.github.carter659.spring06; import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; /** * 博客出处：http://www.cnblogs.com/GoodHelper/ * * @author 刘冬 * */ @SpringBootApplication public class App { public static void main(String[] args) { SpringApplication.run(App.class, args); } }
运行效果：
添加数据
点击保存按钮，并观察数据是否回滚：
虽然抛出异常，但数据并未回滚。
二、实现事务
这时，我修改OrderDao类，增加@Transactional(readOnly = false, rollbackFor = Throwable.class)注解：
package com.github.carter659.spring06; import java.util.List; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Repository; import org.springframework.transaction.annotation.Transactional; import com.mysql.jdbc.StringUtils; @Repository @Transactional(readOnly = false, rollbackFor = Throwable.class) public class OrderDao { @Autowired private OrderRepository orderRepository; /** * 获取全部 * * @return */ public List<Order> findAll() { return orderRepository.findAll(); } /** * 持久化 * * @param entity * @return */ public void save(Order entity) throws Exception { // 持久化 orderRepository.save(entity); // 如果持久化成功，就抛出异常。如果开启事务，那么刚才持久化的数据应回滚 if (!StringUtils.isNullOrEmpty(entity.id)) throw new Exception("测试无法持久化第一条数据的异常"); } }
继续添加数据：
按钮保存按钮，发现：数据回滚
代码下载：https://github.com/carter659/spring-boot-06.git
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