使用spring-data-jpa案例

Chapter3-2-2/pom.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<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.didispace</groupId>
+	<artifactId>demo</artifactId>
+	<version>1.0.0</version>
+	<packaging>jar</packaging>
+
+	<name>demo</name>
+	<description>Spring Boot project</description>
+
+	<parent>
+		<groupId>org.springframework.boot</groupId>
+		<artifactId>spring-boot-starter-parent</artifactId>
+		<version>1.3.2.RELEASE</version>
+		<relativePath/> <!-- lookup parent from repository -->
+	</parent>
+
+	<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</artifactId>
+		</dependency>
+
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-starter-test</artifactId>
+			<scope>test</scope>
+		</dependency>
+
+		<dependency>
+			<groupId>mysql</groupId>
+			<artifactId>mysql-connector-java</artifactId>
+			<version>5.1.21</version>
+		</dependency>
+
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-starter-data-jpa</artifactId>
+		</dependency>
+
+	</dependencies>
+	
+	<build>
+		<plugins>
+			<plugin>
+				<groupId>org.springframework.boot</groupId>
+				<artifactId>spring-boot-maven-plugin</artifactId>
+			</plugin>
+		</plugins>
+	</build>
+
+
+</project>

Chapter3-2-2/src/main/java/com/didispace/Application.java

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+package com.didispace;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class Application {
+
+	public static void main(String[] args) {
+		SpringApplication.run(Application.class, args);
+	}
+
+}

Chapter3-2-2/src/main/java/com/didispace/domain/User.java

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+package com.didispace.domain;
+
+import javax.persistence.Column;
+import javax.persistence.Entity;
+import javax.persistence.GeneratedValue;
+import javax.persistence.Id;
+
+/**
+ * @author 程序猿DD
+ * @version 1.0.0
+ * @date 16/3/21 下午3:35.
+ * @blog http://blog.didispace.com
+ */
+@Entity
+public class User {
+
+    @Id
+    @GeneratedValue
+    private Long id;
+
+    @Column(nullable = false)
+    private String name;
+
+    @Column(nullable = false)
+    private Integer age;
+
+    public User(){}
+
+    public User(String name, Integer age) {
+        this.name = name;
+        this.age = age;
+    }
+
+    public Long getId() {
+        return id;
+    }
+
+    public void setId(Long id) {
+        this.id = id;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public Integer getAge() {
+        return age;
+    }
+
+    public void setAge(Integer age) {
+        this.age = age;
+    }
+
+}

Chapter3-2-2/src/main/java/com/didispace/domain/UserRepository.java

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+package com.didispace.domain;
+
+import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.data.jpa.repository.Query;
+import org.springframework.data.repository.query.Param;
+
+
+/**
+ * @author 程序猿DD
+ * @version 1.0.0
+ * @date 16/3/23 下午2:34.
+ * @blog http://blog.didispace.com
+ */
+public interface UserRepository extends JpaRepository<User, Long> {
+
+    User findByName(String name);
+
+    User findByNameAndAge(String name, Integer age);
+
+    @Query("from User u where u.name=:name")
+    User findUser(@Param("name") String name);
+
+
+}

Chapter3-2-2/src/main/resources/application.properties

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+spring.datasource.url=jdbc:mysql://localhost:3306/test
+spring.datasource.username=root
+spring.datasource.password=root
+spring.datasource.driver-class-name=com.mysql.jdbc.Driver
+
+spring.jpa.properties.hibernate.hbm2ddl.auto=create-drop

Chapter3-2-2/src/test/java/com/didispace/ApplicationTests.java

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+package com.didispace;
+
+import com.didispace.domain.User;
+import com.didispace.domain.UserRepository;
+import org.junit.Assert;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.SpringApplicationConfiguration;
+import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
+
+
+@RunWith(SpringJUnit4ClassRunner.class)
+@SpringApplicationConfiguration(Application.class)
+public class ApplicationTests {
+
+	@Autowired
+	private UserRepository userRepository;
+
+	@Test
+	public void test() throws Exception {
+
+		// 创建10条记录
+		userRepository.save(new User("AAA", 10));
+		userRepository.save(new User("BBB", 20));
+		userRepository.save(new User("CCC", 30));
+		userRepository.save(new User("DDD", 40));
+		userRepository.save(new User("EEE", 50));
+		userRepository.save(new User("FFF", 60));
+		userRepository.save(new User("GGG", 70));
+		userRepository.save(new User("HHH", 80));
+		userRepository.save(new User("III", 90));
+		userRepository.save(new User("JJJ", 100));
+
+		// 测试findAll, 查询所有记录
+		Assert.assertEquals(10, userRepository.findAll().size());
+
+		// 测试findByName, 查询姓名为FFF的User
+		Assert.assertEquals(60, userRepository.findByName("FFF").getAge().longValue());
+
+		// 测试findUser, 查询姓名为FFF的User
+		Assert.assertEquals(60, userRepository.findUser("FFF").getAge().longValue());
+
+		// 测试findByNameAndAge, 查询姓名为FFF并且年龄为60的User
+		Assert.assertEquals("FFF", userRepository.findByNameAndAge("FFF", 60).getName());
+
+		// 测试删除姓名为AAA的User
+		userRepository.delete(userRepository.findByName("AAA"));
+
+		// 测试findAll, 查询所有记录, 验证上面的删除是否成功
+		Assert.assertEquals(9, userRepository.findAll().size());
+
+
+
+
+	}
+
+
+}