技术分享 | 数据持久化技术（Java）

本文节选自霍格沃兹测试学院内部教材

本章介绍 Web 后端开发中数据持久化技术 TKMyBatis。

TKMyBatis简介

TKMybatis 是基于 Mybatis 框架开发的一个工具，内部实现了对单表的基本数据操作，只需要简单继承 TKMybatis 提供的接口，就能够实现无需编写任何 sql 即能完成单表操作。

下面简单介绍下 MyBatis ， MyBatis 是一款优秀的持久层框架，它支持自定义 SQL、存储过程以及高级映射。MyBatis 免除了几乎所有的 JDBC 代码以及设置参数和获取结果集的工作。MyBatis 可以通过简单的 XML 或注解来配置和映射原始类型、接口和 Java POJO（Plain Old Java Objects，普通老式 Java 对象）为数据库中的记录。

详细内容请参考 https://mybatis.org/mybatis-3/zh/index.html

TKMyBatis快速开始

Maven依赖

<pre class="copy-codeblocks" style="font-family: Consolas, Menlo, Monaco, "Lucida Console", "Liberation Mono", "DejaVu Sans Mono", "Bitstream Vera Sans Mono", "Courier New", monospace; font-size: 15.008px; display: block; position: relative; overflow: visible; color: rgb(34, 34, 34); font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255); text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial;"> `<dependency>

        <groupId>org.mybatis.spring.boot</groupId>

        <artifactId>mybatis-spring-boot-starter</artifactId>

        <version>2.1.0</version>

    </dependency>

    <dependency>

        <groupId>tk.mybatis</groupId>

        <artifactId>mapper</artifactId>

        <version>4.0.3</version>

    </dependency>

    <dependency>

        <groupId>tk.mybatis</groupId>

        <artifactId>mapper-spring-boot-starter</artifactId>

        <version>2.0.3</version>

    </dependency>

    <dependency>

        <groupId>mysql</groupId>

        <artifactId>mysql-connector-java</artifactId>

        <scope>runtime</scope>

    </dependency>` </pre>

在启动类中配置 MapperScan 扫描

<pre class="copy-codeblocks" style="font-family: Consolas, Menlo, Monaco, "Lucida Console", "Liberation Mono", "DejaVu Sans Mono", "Bitstream Vera Sans Mono", "Courier New", monospace; font-size: 15.008px; display: block; position: relative; overflow: visible; color: rgb(34, 34, 34); font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255); text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial;">`import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import tk.mybatis.spring.annotation.MapperScan;

@SpringBootApplication

@MapperScan("com.hogwartsmini.demo.dao")

public class DemoApplication {

public static void main(String[] args) {

    SpringApplication.run(DemoApplication.class, args);

}

}` </pre>

实体类中使用

在实体类中，常用的注解和意义为：

Table：描述数据库表信息，主要属性有 name(表名)、schema、catalog、uniqueConstraints 等。

Id：指定表主键字段，没有属性值。

Column：描述数据库字段信息，主要属性有 name(字段名)、columnDefinition、insertable、length、nullable(是否可为空)、precision、scale、table、unique、updatable 等。

ColumnType：描述数据库字段类型，可对一些特殊类型作配置，进行特殊处理，主要属性有 jdbcType、column、typeHandler 等。

dao 中使用

  • 创建业务 Mapper 公共接口

首先创建一个公共接口，继承 Mapper, MySqlMapper, IdsMapper 三个类，用于后续业务 Mapper 接口直接实现。

<pre class="copy-codeblocks" style="font-family: Consolas, Menlo, Monaco, "Lucida Console", "Liberation Mono", "DejaVu Sans Mono", "Bitstream Vera Sans Mono", "Courier New", monospace; font-size: 15.008px; display: block; position: relative; overflow: visible; color: rgb(34, 34, 34); font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255); text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial;">`import tk.mybatis.mapper.common.IdsMapper;

import tk.mybatis.mapper.common.Mapper;

import tk.mybatis.mapper.common.MySqlMapper;

public interface MySqlExtensionMapper<T> extends Mapper<T>, MySqlMapper<T>, IdsMapper<T> {

}` </pre>

  • 创建业务 Mapper 接口

创建 HogwartsTestUserMapper.java 接口

<pre class="copy-codeblocks" style="font-family: Consolas, Menlo, Monaco, "Lucida Console", "Liberation Mono", "DejaVu Sans Mono", "Bitstream Vera Sans Mono", "Courier New", monospace; font-size: 15.008px; display: block; position: relative; overflow: visible; color: rgb(34, 34, 34); font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255); text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial;">`import com.hogwartsmini.demo.common.MySqlExtensionMapper;

import com.hogwartsmini.demo.entity.HogwartsTestUser;

import org.springframework.stereotype.Repository;

@Repository

public interface HogwartsTestUserMapper extends MySqlExtensionMapper<HogwartsTestUser> {

}` </pre>

Service 层中使用

  • 新增操作
类型 说明
Mapper.insert(record) 保存一个实体，null 的属性也会保存，不会使用数据库默认值
Mapper.insertSelective(record) 保存一个实体，忽略空值，即没提交的值会使用使用数据库默认值
Mapper.insertUseGeneratedKeys(record) 保存一个实体，会自动填入在数据库中生成的 id 值。注意使用此方法插入数据时，如果 id 字段不是 AUTO_INCREMENT ,则不会生成新的 id
  • 删除
类型 说明
Mapper.delete(record) 根据实体属性作为条件进行删除，查询条件使用等号
Mapper.deleteByExample(example) 根据 Example 条件删除数据
Mapper.deleteByPrimaryKey(key) 根据主键字段进行删除，方法参数必须包含完整的主键属性
  • 修改
类型 说明
Mapper.updateByExample(record,example) 根据 Example 条件更新实体record 包含的全部属性，null 值会被更新
Mapper.updateByExampleSelective(record, example) 根据 Example 条件更新实体record 包含的不是 null 的属性值
Mapper.updateByPrimaryKey(record) 根据主键更新实体全部字段，null 值会被更新
Mapper.updateByPrimaryKeySelective(record) 根据主键更新属性不为 null 的值
  • 查询
类型 说明
Mapper.select(record) 根据实体中的属性值进行查询，查询条件使用等号
Mapper.selectAll() 查询全部结果
Mapper.selectByExample(example) 根据 Example 条件进行查询
Mapper.selectByPrimaryKey(key) 根据主键字段进行查询，方法参数必须包含完整的主键属性，查询条件使用等号
Mapper.selectCount(record) 根据实体中的属性查询总数，查询条件使用等号
Mapper.selectCountByExample(example) 根据 Example 条件进行查询总数
Mapper.selectByExample(example) 根据 Example 条件进行查询
Mapper.selectOne(record) 根据实体中的属性进行查询，只能有一个返回值，有多个结果是抛出异常，查询条件使用等号。但是如果存在某个属性为 int，则会初始化为 0。可能影响到实际使用

Spring Boot 配置文件

<pre class="copy-codeblocks" style="font-family: Consolas, Menlo, Monaco, "Lucida Console", "Liberation Mono", "DejaVu Sans Mono", "Bitstream Vera Sans Mono", "Courier New", monospace; font-size: 15.008px; display: block; position: relative; overflow: visible; color: rgb(34, 34, 34); font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255); text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial;">`spring:

application:

name: aitest

数据库配置信息

datasource:

url: jdbc:mysql://localhost:3306/aitest_mini?allowMultiQueries=true&useUnicode=true&characterEncoding=UTF-8&serverTimezone=Asia/Shanghai

username: hogwarts

password: db@hogwarts

driver-class-name: com.mysql.cj.jdbc.Driver

mybatis:

mapper-locations: classpath:mapper/*.xml

type-aliases-package: com.hogwartstest.aitestmini.entity

configuration:

mapUnderscoreToCamelCase: true

logging:

level:

com.hogwartstest.aitestmini.dao: debug #打印sql` </pre>

示例表结构

<pre class="copy-codeblocks" style="font-family: Consolas, Menlo, Monaco, "Lucida Console", "Liberation Mono", "DejaVu Sans Mono", "Bitstream Vera Sans Mono", "Courier New", monospace; font-size: 15.008px; display: block; position: relative; overflow: visible; color: rgb(34, 34, 34); font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255); text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial;">CREATE TABLEhogwarts_test_user` (

id int NOT NULL AUTO_INCREMENT COMMENT '主键',

user_name varchar(50) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NOT NULL COMMENT '用户名',

password varchar(32) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NOT NULL COMMENT '密码',

email varchar(50) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci DEFAULT NULL COMMENT '邮箱',

auto_create_case_job_name varchar(50) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci DEFAULT NULL COMMENT '自动生成用例job名称 不为空时表示已经创建job',

start_test_job_name varchar(50) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci DEFAULT NULL COMMENT '执行测试job名称 不为空时表示已经创建job',

default_jenkins_id int DEFAULT NULL COMMENT '默认Jenkins服务器',

create_time datetime NOT NULL COMMENT '创建时间',

update_time datetime NOT NULL COMMENT '更新时间',

PRIMARY KEY (id) USING BTREE

) ENGINE=InnoDB AUTO_INCREMENT=12 DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_general_ci ROW_FORMAT=DYNAMIC COMMENT='用户表';` </pre>

Controller 代码

<pre class="copy-codeblocks" style="font-family: Consolas, Menlo, Monaco, "Lucida Console", "Liberation Mono", "DejaVu Sans Mono", "Bitstream Vera Sans Mono", "Courier New", monospace; font-size: 15.008px; display: block; position: relative; overflow: visible; color: rgb(34, 34, 34); font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255); text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial;">`import com.hogwartsmini.demo.entity.HogwartsTestUser;

import com.hogwartsmini.demo.service.HogwartsTestUserService;

import io.swagger.annotations.Api;

import io.swagger.annotations.ApiOperation;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.web.bind.annotation.*;

import java.util.List;

/**

  • @Author tlibn

  • @Date 2020/7/16 17:14

**/

@Api(tags = "霍格沃兹测试学院-用户管理模块")

@RestController

@RequestMapping("hogwartsUser")

public class HogwartsTestUserDbController {

@Autowired

private HogwartsTestUserService hogwartsTestUserService;

@ApiOperation("用户注册")

@PostMapping("register")

public HogwartsTestUser register(

        @RequestBody HogwartsTestUser hogwartsTestUser){

    return hogwartsTestUserService.save(hogwartsTestUser);

}

@ApiOperation("用户信息修改接口")

@PutMapping()

public HogwartsTestUser updateUserInfo(

        @RequestBody HogwartsTestUser hogwartsTestUser){

    return hogwartsTestUserService.update(hogwartsTestUser);

}

@ApiOperation("根据用户id删除用户信息")

@DeleteMapping("{userId}")

public Integer delete(@PathVariable("userId") Integer userId){

    return hogwartsTestUserService.delete(userId);

}

@ApiOperation("根据用户名查询")

@GetMapping("byName")

public List<HogwartsTestUser> getByName(

        @RequestParam("userName") String userName){

    HogwartsTestUser hogwartsTestUser = new HogwartsTestUser();

    hogwartsTestUser.setUserName(userName);

    return hogwartsTestUserService.getByName(hogwartsTestUser);

}` </pre>

HogwartsTestUserService 代码

<pre class="copy-codeblocks" style="font-family: Consolas, Menlo, Monaco, "Lucida Console", "Liberation Mono", "DejaVu Sans Mono", "Bitstream Vera Sans Mono", "Courier New", monospace; font-size: 15.008px; display: block; position: relative; overflow: visible; color: rgb(34, 34, 34); font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255); text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial;">`import com.hogwartsmini.demo.entity.HogwartsTestUser;

import java.util.List;

public interface HogwartsTestUserService {

/**

  • 保存

  • @param hogwartsTestUser

  • @return

/
HogwartsTestUser save(HogwartsTestUser hogwartsTestUser);
/*

  • 更新

  • @param hogwartsTestUser

  • @return

/
HogwartsTestUser update(HogwartsTestUser hogwartsTestUser);
/*

  • 根据用户名查询

  • @param hogwartsTestUser

  • @return

/
List<HogwartsTestUser> getByName(HogwartsTestUser hogwartsTestUser);
/*

  • 根据用户id删除用户信息

  • @param userId

  • @return

*/
Integer delete(Integer userId);
}` </pre>

HogwartsTestUserServiceImpl 代码

<pre class="copy-codeblocks" style="font-family: Consolas, Menlo, Monaco, "Lucida Console", "Liberation Mono", "DejaVu Sans Mono", "Bitstream Vera Sans Mono", "Courier New", monospace; font-size: 15.008px; display: block; position: relative; overflow: visible; color: rgb(34, 34, 34); font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255); text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial;">`import com.hogwartsmini.demo.dao.HogwartsTestUserMapper;
import com.hogwartsmini.demo.entity.HogwartsTestUser;
import com.hogwartsmini.demo.service.HogwartsTestUserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import java.util.Date;
import java.util.List;
/**

  • @Author tlibn
  • @Date 2020/7/17 11:03
    **/

@Service

public class HogwartsTestUserServiceImpl implements HogwartsTestUserService {

@Autowired
private HogwartsTestUserMapper hogwartsTestUserMapper;
/**
 * 保存
 *
 * @param hogwartsTestUser
 * @return
 */

@Override

public HogwartsTestUser save(HogwartsTestUser hogwartsTestUser) {

    hogwartsTestUser.setCreateTime(new Date());

    hogwartsTestUser.setUpdateTime(new Date());

    hogwartsTestUserMapper.insertUseGeneratedKeys(hogwartsTestUser);

    return hogwartsTestUser;

}

/**
 * 更新
 *
 * @param hogwartsTestUser
 * @return
 */
@Override
public HogwartsTestUser update(HogwartsTestUser hogwartsTestUser) {
    hogwartsTestUser.setCreateTime(new Date());
    hogwartsTestUser.setUpdateTime(new Date());
    hogwartsTestUserMapper.updateByPrimaryKeySelective(hogwartsTestUser);
    return hogwartsTestUser;
}
/**
 * 根据用户名查询
 *
 * @param hogwartsTestUser
 * @return
 */
@Override
public List<HogwartsTestUser> getByName(HogwartsTestUser hogwartsTestUser) {
    List<HogwartsTestUser> hogwartsTestUserList = hogwartsTestUserMapper.select(hogwartsTestUser);
    return hogwartsTestUserList;
}

/**
 * 根据用户id删除用户信息
 *
 * @param userId
 * @return
 */
@Override
public Integer delete(Integer userId) {
    HogwartsTestUser hogwartsTestUser = new HogwartsTestUser();
    hogwartsTestUser.setId(userId);
    hogwartsTestUserMapper.delete(hogwartsTestUser);
    return userId;
}

}` </pre>

使用 Postman 测试增删改查

  • 新增

POST http://127.0.0.1:8081/hogwartsUser/register

请求参数

<pre class="copy-codeblocks" style="font-family: Consolas, Menlo, Monaco, "Lucida Console", "Liberation Mono", "DejaVu Sans Mono", "Bitstream Vera Sans Mono", "Courier New", monospace; font-size: 15.008px; display: block; position: relative; overflow: visible; color: rgb(34, 34, 34); font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255); text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial;">{ "userName": "霍格沃兹test123", "password": "test123" } </pre>

响应参数

<pre class="copy-codeblocks" style="font-family: Consolas, Menlo, Monaco, "Lucida Console", "Liberation Mono", "DejaVu Sans Mono", "Bitstream Vera Sans Mono", "Courier New", monospace; font-size: 15.008px; display: block; position: relative; overflow: visible; color: rgb(34, 34, 34); font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255); text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial;">{ "id": 15, "userName": "霍格沃兹test123", "password": "test123", "email": null, "autoCreateCaseJobName": null, "startTestJobName": null, "defaultJenkinsId": null, "createTime": "2021-04-14T09:37:58.358+00:00", "updateTime": "2021-04-14T09:37:58.358+00:00" } </pre>

  • 查询

GET http://127.0.0.1:8081/hogwartsUser/byName?userName=霍格沃兹test123

请求参数

<pre class="copy-codeblocks" style="font-family: Consolas, Menlo, Monaco, "Lucida Console", "Liberation Mono", "DejaVu Sans Mono", "Bitstream Vera Sans Mono", "Courier New", monospace; font-size: 15.008px; display: block; position: relative; overflow: visible; color: rgb(34, 34, 34); font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255); text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial;">见请求地址中 userName =霍格沃兹test123 </pre>

响应参数

<pre class="copy-codeblocks" style="font-family: Consolas, Menlo, Monaco, "Lucida Console", "Liberation Mono", "DejaVu Sans Mono", "Bitstream Vera Sans Mono", "Courier New", monospace; font-size: 15.008px; display: block; position: relative; overflow: visible; color: rgb(34, 34, 34); font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255); text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial;">[ { "id": 15, "userName": "霍格沃兹test123", "password": "test123", "email": null, "autoCreateCaseJobName": null, "startTestJobName": null, "defaultJenkinsId": null, "createTime": "2021-04-14T09:37:58.000+00:00", "updateTime": "2021-04-14T09:37:58.000+00:00" } ] </pre>

  • 修改

PUT http://127.0.0.1:8081/hogwartsUser

请求参数

<pre class="copy-codeblocks" style="font-family: Consolas, Menlo, Monaco, "Lucida Console", "Liberation Mono", "DejaVu Sans Mono", "Bitstream Vera Sans Mono", "Courier New", monospace; font-size: 15.008px; display: block; position: relative; overflow: visible; color: rgb(34, 34, 34); font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255); text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial;">{ "id": 15, "userName": "霍格沃兹test12345", "password": "test123" } </pre>

响应参数

<pre class="copy-codeblocks" style="font-family: Consolas, Menlo, Monaco, "Lucida Console", "Liberation Mono", "DejaVu Sans Mono", "Bitstream Vera Sans Mono", "Courier New", monospace; font-size: 15.008px; display: block; position: relative; overflow: visible; color: rgb(34, 34, 34); font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255); text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial;">{ "id": 15, "userName": "霍格沃兹test12345", "password": "test123", "email": null, "autoCreateCaseJobName": null, "startTestJobName": null, "defaultJenkinsId": null, "createTime": "2021-04-14T09:43:45.018+00:00", "updateTime": "2021-04-14T09:43:45.018+00:00" } </pre>

  • 删除

DELETE http://127.0.0.1:8081/hogwartsUser/15

请求参数

<pre class="copy-codeblocks" style="font-family: Consolas, Menlo, Monaco, "Lucida Console", "Liberation Mono", "DejaVu Sans Mono", "Bitstream Vera Sans Mono", "Courier New", monospace; font-size: 15.008px; display: block; position: relative; overflow: visible; color: rgb(34, 34, 34); font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255); text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial;">见请求地址中15 </pre>

响应参数

<pre class="copy-codeblocks" style="font-family: Consolas, Menlo, Monaco, "Lucida Console", "Liberation Mono", "DejaVu Sans Mono", "Bitstream Vera Sans Mono", "Courier New", monospace; font-size: 15.008px; display: block; position: relative; overflow: visible; color: rgb(34, 34, 34); font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255); text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial;">15 </pre>

数据持久化技术就先讲到这里啦~大家要多练习哦，才能学的更扎实。
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