使用事务控制业务逻辑的完整性

Chapter3-3-1/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);
+	}
+
+}

Chapter3-3-1/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, length = 5)
+    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;
+    }
+
+}

Chapter3-3-1/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);
+
+
+}

Chapter3-3-1/src/main/java/com/didispace/service/UserService.java

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+package com.didispace.service;
+
+import com.didispace.domain.User;
+
+import javax.transaction.Transactional;
+
+/**
+ * Created by Administrator on 2016/5/27.
+ */
+public interface UserService {
+
+    @Transactional
+    User login(String name, String password);
+
+}