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... 2
TKMyBatis快速开始
Maven依赖
在启动类中配置 MapperScan 扫描
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);
}
}
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。
import tk.mybatis.mapper.common.IdsMapper;
import tk.mybatis.mapper.common.Mapper;
import tk.mybatis.mapper.common.MySqlMapper;
public interface MySqlExtensionMapper
}
创建业务 Mapper 接口
创建 HogwartsTestUserMapper.java 接口
import com.hogwartsmini.demo.common.MySqlExtensionMapper;
import com.hogwartsmini.demo.entity.HogwartsTestUser;
import org.springframework.stereotype.Repository;
@Repository
public interface HogwartsTestUserMapper extends MySqlExtensionMapper
}
Service 层中使用
新增操作
删除
修改
查询
Spring Boot 配置文件
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
示例表结构
CREATE TABLE hogwarts_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';
Controller 代码
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
@RequestParam("userName") String userName){
HogwartsTestUser hogwartsTestUser = new HogwartsTestUser();
hogwartsTestUser.setUserName(userName);
return hogwartsTestUserService.getByName(hogwartsTestUser);
}
HogwartsTestUserService 代码
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
/**
- 根据用户id删除用户信息
- @param userId
- @return
*/
Integer delete(Integer userId);
}
HogwartsTestUserServiceImpl 代码
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 ListgetByName(HogwartsTestUser hogwartsTestUser) {
ListhogwartsTestUserList = 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;
}
}
使用 Postman 测试增删改查
新增
POST http://127.0.0.1:8081/hogwart...
请求参数
{
"userName": "霍格沃兹test123",
"password": "test123"
}
响应参数
{
"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"
}
查询
GET http://127.0.0.1:8081/hogwart...霍格沃兹test123
请求参数
见请求地址中 userName =霍格沃兹test123
响应参数
[
{
"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"
}
]
修改
PUT http://127.0.0.1:8081/hogwart...
请求参数
{
"id": 15,
"userName": "霍格沃兹test12345",
"password": "test123"
}
响应参数
{
"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"
}
删除
DELETE http://127.0.0.1:8081/hogwart...
请求参数
见请求地址中15
响应参数
15
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。