init springdata-jpa

Author: Tellsea

springboot-jpa/.gitignore

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+HELP.md
+/target/
+!.mvn/wrapper/maven-wrapper.jar
+
+### STS ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+
+### IntelliJ IDEA ###
+.idea
+*.iws
+*.iml
+*.ipr
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+/build/
+
+### VS Code ###
+.vscode/

springboot-jpa/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>
+    <parent>
+        <groupId>org.springframework.boot</groupId>
+        <artifactId>spring-boot-starter-parent</artifactId>
+        <version>2.1.3.RELEASE</version>
+        <relativePath/> <!-- lookup parent from repository -->
+    </parent>
+    <groupId>cn.tellsea</groupId>
+    <artifactId>springboot-jpa</artifactId>
+    <version>0.0.1-SNAPSHOT</version>
+    <name>springboot-jpa</name>
+    <description>Demo project for Spring Boot</description>
+
+    <properties>
+        <java.version>1.8</java.version>
+    </properties>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-data-jpa</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-web</artifactId>
+        </dependency>
+
+        <dependency>
+            <groupId>mysql</groupId>
+            <artifactId>mysql-connector-java</artifactId>
+            <scope>runtime</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.projectlombok</groupId>
+            <artifactId>lombok</artifactId>
+            <optional>true</optional>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-test</artifactId>
+            <scope>test</scope>
+        </dependency>
+
+        <dependency>
+            <groupId>com.alibaba</groupId>
+            <artifactId>druid-spring-boot-starter</artifactId>
+            <version>1.1.14</version>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.springframework.boot</groupId>
+                <artifactId>spring-boot-maven-plugin</artifactId>
+            </plugin>
+        </plugins>
+    </build>
+
+</project>

springboot-jpa/sql/springboot-jpa.sql

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+/*
+ Navicat Premium Data Transfer
+
+ Source Server         : localhost
+ Source Server Type    : MySQL
+ Source Server Version : 50713
+ Source Host           : localhost:3306
+ Source Schema         : springboot-jpa
+
+ Target Server Type    : MySQL
+ Target Server Version : 50713
+ File Encoding         : 65001
+
+ Date: 17/04/2019 13:48:19
+*/
+
+SET NAMES utf8mb4;
+SET FOREIGN_KEY_CHECKS = 0;
+
+-- ----------------------------
+-- Table structure for tb_user
+-- ----------------------------
+DROP TABLE IF EXISTS `tb_user`;
+CREATE TABLE `tb_user`  (
+  `id` int(11) NOT NULL AUTO_INCREMENT,
+  `user_name` varchar(255) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL,
+  `user_password` varchar(255) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL,
+  PRIMARY KEY (`id`) USING BTREE
+) ENGINE = MyISAM AUTO_INCREMENT = 5 CHARACTER SET = utf8 COLLATE = utf8_general_ci ROW_FORMAT = Dynamic;
+
+-- ----------------------------
+-- Records of tb_user
+-- ----------------------------
+INSERT INTO `tb_user` VALUES (1, '小海绵', '654321');
+INSERT INTO `tb_user` VALUES (2, 'Susan', '123456');
+INSERT INTO `tb_user` VALUES (3, 'Bob', '123456');
+INSERT INTO `tb_user` VALUES (4, 'Lingda', '123456');
+
+SET FOREIGN_KEY_CHECKS = 1;

springboot-jpa/src/main/java/cn/tellsea/SpringbootJpaApplication.java

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

springboot-jpa/src/main/java/cn/tellsea/bean/User.java

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+package cn.tellsea.bean;
+
+import lombok.Data;
+
+import javax.persistence.*;
+
+@Data
+@Entity
+@Table(name = "tb_user")
+public class User {
+
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    private Integer id;
+    private String userName;
+    private String userPassword;
+}

springboot-jpa/src/main/java/cn/tellsea/repository/UserRepository.java

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+package cn.tellsea.repository;
+
+import cn.tellsea.bean.User;
+import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.data.jpa.repository.Query;
+
+public interface UserRepository extends JpaRepository<User, Integer> {
+
+    User findByUserName(String username);
+
+    // 方式一：hql语句
+    @Query(value = "select u from User u where u.userName = ?1")
+    // 方式二：原生的sql
+    // @Query(value = "select * from tb_user where user_name = ?1", nativeQuery = true)
+    User finByName(String userName);
+}

springboot-jpa/src/main/java/cn/tellsea/service/UserService.java

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+package cn.tellsea.service;
+
+import cn.tellsea.bean.User;
+import org.springframework.data.domain.Page;
+
+import java.util.List;
+
+public interface UserService {
+
+    void save(User user);
+
+    void update(User user);
+
+    void delete(Integer id);
+
+    User findById(Integer id);
+
+    List<User> findAll();
+
+    Page<User> listByPage(int pageCode, int pageSize);
+
+    User findByUserName(String userName);
+
+    User findByName(String userName);
+}

springboot-jpa/src/main/java/cn/tellsea/service/impl/UserServiceImpl.java

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+package cn.tellsea.service.impl;
+
+import cn.tellsea.bean.User;
+import cn.tellsea.repository.UserRepository;
+import cn.tellsea.service.UserService;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.data.domain.Page;
+import org.springframework.data.domain.PageRequest;
+import org.springframework.data.domain.Pageable;
+import org.springframework.stereotype.Service;
+
+import java.util.List;
+
+@Service
+public class UserServiceImpl implements UserService {
+
+    @Autowired
+    private UserRepository userRepository;
+
+    @Override
+    public void save(User user) {
+        userRepository.save(user);
+    }
+
+    @Override
+    public void update(User user) {
+        // 新增和更新调用的接口一样，区别就是更新的参数中有id
+        userRepository.save(user);
+    }
+
+    @Override
+    public void delete(Integer id) {
+        // 新增和更新调用的接口一样，区别就是更新的参数中有id
+        userRepository.deleteById(id);
+    }
+
+    @Override
+    public User findById(Integer id) {
+        // 新增和更新调用的接口一样，区别就是更新的参数中有id
+        return userRepository.findById(id).get();
+    }
+
+    @Override
+    public List<User> findAll() {
+        // 新增和更新调用的接口一样，区别就是更新的参数中有id
+        return userRepository.findAll();
+    }
+
+    @Override
+    public Page<User> listByPage(int pageCode, int pageSize) {
+
+//        Sort sort = new Sort(Sort.Direction.ASC, "id"); 排序
+//        Pageable pageable = new PageRequest(pageCode, pageSize, sort);
+        Pageable pageable = PageRequest.of(pageCode, pageSize);
+        return userRepository.findAll(pageable);
+    }
+
+    @Override
+    public User findByUserName(String userName) {
+        return userRepository.findByUserName(userName);
+    }
+
+    @Override
+    public User findByName(String userName) {
+        return userRepository.finByName(userName);
+    }
+}

springboot-jpa/src/main/java/cn/tellsea/web/UserController.java

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+package cn.tellsea.web;
+
+import org.springframework.stereotype.Controller;
+
+@Controller
+public class UserController {
+}

springboot-jpa/src/main/resources/application.yml

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+spring:
+  datasource:
+    type: com.alibaba.druid.pool.DruidDataSource
+    druid:
+      driver-class-name: com.mysql.jdbc.Driver
+      url: jdbc:mysql://127.0.0.1:3306/springboot-jpa?useUnicode=true&characterEncoding=UTF-8
+      username: root
+      password: 123456
+  jpa:
+    show-sql: true
+    hibernate:
+      dialect: org.hibernate.dialect.MySQL5Dialect
+      ddl-auto: update

springboot-jpa/src/test/java/cn/tellsea/SpringbootJpaApplicationTests.java

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+package cn.tellsea;
+
+import cn.tellsea.bean.User;
+import cn.tellsea.service.UserService;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.data.domain.Page;
+import org.springframework.test.context.junit4.SpringRunner;
+
+import java.util.List;
+
+@RunWith(SpringRunner.class)
+@SpringBootTest
+public class SpringbootJpaApplicationTests {
+
+    @Autowired
+    private UserService userService;
+
+    // 新增
+    @Test
+    public void save() {
+        User user = new User();
+        user.setUserName("Lingda");
+        user.setUserPassword("123456");
+        userService.save(user);
+    }
+
+    // 更新
+    @Test
+    public void update() {
+        User user = new User();
+        user.setId(1);
+        user.setUserName("小海绵");
+        user.setUserPassword("654321");
+        userService.update(user);
+    }
+
+    // 删除
+    @Test
+    public void delete() {
+        userService.delete(5);
+    }
+
+    // 根据id查
+    @Test
+    public void get() {
+        User user = userService.findById(1);
+        System.out.println(user);
+    }
+
+    // 查询所有
+    @Test
+    public void list() {
+        List<User> list = userService.findAll();
+        list.forEach(user -> System.out.println(user));
+    }
+
+    // 分页查询
+    @Test
+    public void listByPage() {
+        int pageCode = 0; // 当前页，注意这里默认第一页是0，坑爹
+        int pageSize = 3; // 每页显示3条记录
+        Page<User> page = userService.listByPage(pageCode, pageSize);
+        System.out.println("总记录数=" + page.getTotalElements());
+        System.out.println("总页数=" + page.getTotalPages());
+        page.getContent().forEach(user -> System.out.println(user));
+    }
+
+    // 自定义查询 -- 方法
+    @Test
+    public void findByUserName() {
+        User user = userService.findByUserName("小海绵");
+        System.out.println(user);
+    }
+
+    // 自定义查询 -- 注解
+    @Test
+    public void findByName() {
+        User user = userService.findByName("小海绵");
+        System.out.println(user);
+    }
+}