增加 jpa 示例

lab-13/lab-13-jpa/pom.xml

@@ -0,0 +1,41 @@
+<?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">
+    <parent>
+        <groupId>org.springframework.boot</groupId>
+        <artifactId>spring-boot-starter-parent</artifactId>
+        <version>2.1.3.RELEASE</version>
+        <relativePath/> <!-- lookup parent from repository -->
+    </parent>
+    <modelVersion>4.0.0</modelVersion>
+
+    <artifactId>lab-13-jpa</artifactId>
+
+    <dependencies>
+        <!-- 实现对数据库连接池的自动化配置 -->
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-jdbc</artifactId>
+        </dependency>
+        <dependency> <!-- 本示例，我们使用 MySQL -->
+            <groupId>mysql</groupId>
+            <artifactId>mysql-connector-java</artifactId>
+            <version>5.1.48</version>
+        </dependency>
+
+        <!-- 实现对 Spring Data JPA 的自动化配置 -->
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-data-jpa</artifactId>
+        </dependency>
+
+        <!-- 方便等会写单元测试 -->
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-test</artifactId>
+            <scope>test</scope>
+        </dependency>
+    </dependencies>
+
+</project>

lab-13/lab-13-jpa/src/main/java/cn/iocoder/springboot/lab13/jpa/Application.java

@@ -0,0 +1,7 @@
+package cn.iocoder.springboot.lab13.jpa;
+
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class Application {
+}

lab-13/lab-13-jpa/src/main/java/cn/iocoder/springboot/lab13/jpa/dataobject/UserDO.java

@@ -0,0 +1,73 @@
+package cn.iocoder.springboot.lab13.jpa.dataobject;
+
+import javax.persistence.*;
+import java.util.Date;
+
+/**
+ * 用户 DO
+ */
+@Entity(name = "users")
+public class UserDO {
+
+    /**
+     * 用户编号
+     */
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY,  // strategy 设置使用数据库主键自增策略；
+            generator = "JDBC") // generator 设置插入完成后，查询最后生成的 ID 填充到该属性中。
+    private Integer id;
+    /**
+     * 账号
+     */
+    @Column(nullable = false)
+    private String username;
+    /**
+     * 密码（明文）
+     *
+     * ps：生产环境下，千万不要明文噢
+     */
+    @Column(nullable = false)
+    private String password;
+    /**
+     * 创建时间
+     */
+    @Column(name = "create_time", nullable = false)
+    private Date createTime;
+
+    public Integer getId() {
+        return id;
+    }
+
+    public UserDO setId(Integer id) {
+        this.id = id;
+        return this;
+    }
+
+    public String getUsername() {
+        return username;
+    }
+
+    public UserDO setUsername(String username) {
+        this.username = username;
+        return this;
+    }
+
+    public String getPassword() {
+        return password;
+    }
+
+    public UserDO setPassword(String password) {
+        this.password = password;
+        return this;
+    }
+
+    public Date getCreateTime() {
+        return createTime;
+    }
+
+    public UserDO setCreateTime(Date createTime) {
+        this.createTime = createTime;
+        return this;
+    }
+
+}

lab-13/lab-13-jpa/src/main/java/cn/iocoder/springboot/lab13/jpa/repository/UserRepository01.java

@@ -0,0 +1,12 @@
+package cn.iocoder.springboot.lab13.jpa.repository;
+
+import cn.iocoder.springboot.lab13.jpa.dataobject.UserDO;
+import org.springframework.data.repository.CrudRepository;
+import org.springframework.stereotype.Repository;
+
+@Repository
+public interface UserRepository01 extends CrudRepository<UserDO, Integer> {
+
+
+
+}

lab-13/lab-13-jpa/src/main/resources/application.yaml

@@ -0,0 +1,10 @@
+spring:
+  # datasource 数据源配置内容
+  datasource:
+    url: jdbc:mysql://47.112.193.81:3306/testb5f4?useSSL=false&useUnicode=true&characterEncoding=UTF-8
+    driver-class-name: com.mysql.jdbc.Driver
+    username: testb5f4
+    password: F4df4db0ed86@11
+  # JPA 配置内容
+  jpa:
+    show-sql: true # 打印 SQL 。生产环境，建议关闭

lab-13/lab-13-jpa/src/test/java/cn/iocoder/springboot/lab13/jpa/repository/UserRepository01Test.java

@@ -0,0 +1,58 @@
+package cn.iocoder.springboot.lab13.jpa.repository;
+
+import cn.iocoder.springboot.lab13.jpa.dataobject.UserDO;
+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.test.context.junit4.SpringRunner;
+import org.springframework.util.Assert;
+
+import java.util.Arrays;
+import java.util.Date;
+import java.util.Optional;
+import java.util.UUID;
+
+@RunWith(SpringRunner.class)
+@SpringBootTest
+public class UserRepository01Test {
+
+    @Autowired
+    private UserRepository01 userRepository;
+
+    @Test // 插入一条记录
+    public void testSave() {
+        UserDO user = new UserDO().setUsername(UUID.randomUUID().toString())
+                .setPassword("nicai").setCreateTime(new Date());
+        userRepository.save(user);
+    }
+
+    @Test // 更新一条记录
+    public void testUpdate() {
+        // 先查询一条记录
+        Optional<UserDO> userDO = userRepository.findById(1);
+        Assert.isTrue(userDO.isPresent(), "记录不能为空");
+        // 更新一条记录
+        UserDO updateUser = userDO.get();
+        updateUser.setPassword("yudaoyuanma");
+        userRepository.save(updateUser);
+    }
+
+    @Test // 根据 ID 编号，删除一条记录
+    public void testDelete() {
+        userRepository.deleteById(2);
+    }
+
+    @Test // 根据 ID 编号，查询一条记录
+    public void testSelectById() {
+        Optional<UserDO> userDO = userRepository.findById(1);
+        System.out.println(userDO.get());
+    }
+
+    @Test // 根据 ID 编号数组，查询多条记录
+    public void testSelectByIds() {
+        Iterable<UserDO> users = userRepository.findAllById(Arrays.asList(1, 4));
+        users.forEach(System.out::println);
+    }
+
+}

lab-13/pom.xml

@@ -0,0 +1,19 @@
+<?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">
+    <parent>
+        <artifactId>labs-parent</artifactId>
+        <groupId>cn.iocoder.springboot.labs</groupId>
+        <version>1.0-SNAPSHOT</version>
+    </parent>
+    <modelVersion>4.0.0</modelVersion>
+
+    <artifactId>lab-13</artifactId>
+    <packaging>pom</packaging>
+    <modules>
+        <module>lab-13-jpa</module>
+    </modules>
+
+
+</project>

pom.xml

@@ -21,6 +21,7 @@
         <module>lab-10</module>
         <module>lab-11</module>
         <module>lab-12</module>
+        <module>lab-13</module>
     </modules>