SpringBoot数据访问之Mybatis的示例分析
这篇文章主要介绍Spring Boot数据访问之Mybatis的示例分析,文中介绍的非常详细,具有一定的参考价值,感兴趣的小伙伴们一定要看完!
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一、什么是MyBatis
支持定制化SQL、存储过程以及高级映射的优秀的持久层框架 避免了几乎所有的 JDBC 代码和手动设置参数以及获取结果集 可以对配置和原生Map使用简单的 XML 或注解 将接口和 Java 的 POJOs(Plain Old Java Objects,普通的 Java对象)映射成数据库中的记录 数据库、数据源、数据库连接池、JDBC、JDBC实现是什么关系?
JDBC:Java和关系型数据库的桥梁,是一个规范,不是实现。不同类型的数据库需要有自己的JDBC实现
数据源:包含数据库连接池,连接池管理。常见的有C3P0、HikariDataSoiurce、Druid等
连接池:预先创建一些数据库连接,放到连接池里面,用的时候从连接池里面取,用完后放回连接池
连接池管理:创建数据库连接,管理数据库连接
JDBC实现:MySQL JDBC实现、Oracle JDBC实现等其他实现
MyBatis对JDBC进行了封装
二、整合MyBatis
我们基于之前创建的项目spring-boot-06-data-druid 来创建spring-boot-07-data-mybatis项目
1)引入MyBatis依赖
org.mybatis.spring.boot
mybatis-spring-boot-starter
2.1.1
2)引入其他依赖
org.springframework.boot
spring-boot-starter-web
mysql
mysql-connector-java
runtime
io.springfox
springfox-swagger2
2.9.2
io.springfox
springfox-swagger-ui
2.9.2
com.alibaba
druid
1.1.21
3)依赖图
三、用注解方式使用 MyBatis
1.准备创建department表的脚本
DROP TABLE IF EXISTS `department`;
CREATE TABLE `department` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`department_name` varchar(255) DEFAULT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8;
2.application.yml 自动执行脚本
initialization-mode: always
schema:
- classpath:department.sql
执行一次后,注释 initialization-mode
# initialization-mode: always
3.创建department 实体类
package com.jackson0714.springboot.entity;
public class Department {
private Long id;
private String departmentName;
public void setId(Long id) {
this.id = id;
}
public Long getId() {
return id;
}
public void setDepartmentName(String departmentName) {
this.departmentName = departmentName;
}
public String getDepartmentName() {
return departmentName;
}
}
4.创建Mapper映射类,并将SQL注解到方法上
增删改查,你要的都在这里:
@Mapper
public interface DepartmentMapper {
@Select("select * from department")
List
@Select("select * from department where id=#{id}")
Department getDepartmentById(Long id);
@Delete("delete from department where id=#{id}")
int deleteDepartment(Long id);
@Insert("insert into department(department_name) values(#{departmentName})")
int createDepartment(String departmentName);
@Update("update department set department_name=#{departmentName} where id=#{id}")
int updateDepartmentById(Long id, String departmentName);
}
5.创建MyBatis 配置类
增加自定义配置:如果表的字段名有下划线格式的,转为驼峰命名格式
@org.springframework.context.annotation.Configurationpublic class MyBatisConfig { @Bean public ConfigurationCustomizer configurationCustomizer() { return new ConfigurationCustomizer() { @Override public void customize(Configuration configuration) { // 如果表的字段名有下划线格式的,转为驼峰命名格式 configuration.setMapUnderscoreToCamelCase(true); } }; }}
6.创建DepartmentController
@Api(value = "DepartmentController", description = "部门controller")
@RequestMapping("/v1/client")
@RestController
public class DepartmentController {
@Autowired
DepartmentMapper departmentMapper;
@ApiOperation(value = "1.查询所有部门")
@GetMapping("/dept/getAllDepartment")
public List
return departmentMapper.getAllDepartment();
}
@ApiOperation(value = "2.根据id查询某个部门")
@ApiImplicitParams({
@ApiImplicitParam(name = "id", value = "需要查询的部门id")
})
@GetMapping("/dept/{id}")
public Department getDepartmentById(@PathVariable Long id) {
return departmentMapper.getDepartmentById(id);
}
@ApiOperation(value = "3.新增部门")
@ApiImplicitParams({
@ApiImplicitParam(name = "name", value = "部门名称")
})
@PostMapping("/dept/create")
public int createDepartment(@RequestParam String name) {
return departmentMapper.createDepartment(name);
}
@ApiOperation(value = "4.根据id删除部门")
@ApiImplicitParams({
@ApiImplicitParam(name = "id", value = "需要删除的部门id")
})
@PostMapping("/dept/delete")
public int deleteDepartment(@RequestParam Long id) {
return departmentMapper.deleteDepartment(id);
}
@ApiOperation(value = "5.根据id更新部门名称")
@ApiImplicitParams({
@ApiImplicitParam(name = "id", value = "需要更新的部门id"),
@ApiImplicitParam(name = "name", value = "需要更新的部门名称")
})
@PostMapping("/dept/update")
public int updateDepartmentById(@RequestParam Long id, @RequestParam String name) {
return departmentMapper.updateDepartmentById(id, name);
}
}
使用Swagger来测试
四、用配置方式使用 MyBatis
1. 文件结构
2. 创建user表的脚本
SET FOREIGN_KEY_CHECKS=0;
-- ----------------------------
-- Table structure for user
-- ----------------------------
DROP TABLE IF EXISTS `user`;
CREATE TABLE `user` (
`user_id` int(11) NOT NULL AUTO_INCREMENT COMMENT '主键ID',
`user_name` varchar(255) COLLATE utf8mb4_bin NOT NULL COMMENT '用户名',
`password` varchar(255) COLLATE utf8mb4_bin NOT NULL,
`salt` varchar(255) COLLATE utf8mb4_bin DEFAULT NULL COMMENT '随机盐',
`nickName` varchar(255) COLLATE utf8mb4_bin NOT NULL COMMENT '用户名',
`phone` varchar(20) COLLATE utf8mb4_bin DEFAULT NULL COMMENT '手机号',
`avatar` varchar(255) COLLATE utf8mb4_bin DEFAULT NULL COMMENT '头像',
`mini_openId` varchar(32) COLLATE utf8mb4_bin DEFAULT NULL COMMENT '小程序OpenId',
`lock_flag` char(1) COLLATE utf8mb4_bin DEFAULT '0' COMMENT '0-正常,9-锁定',
`del_flag` char(1) COLLATE utf8mb4_bin DEFAULT '0' COMMENT '0-正常,1-删除',
`create_time` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP COMMENT '创建时间',
`update_time` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP COMMENT '更新时间',
PRIMARY KEY (`user_id`),
KEY `user_wx_openid` (`mini_openId`),
KEY `user_idx1_username` (`user_name`)
) ENGINE=InnoDB AUTO_INCREMENT=4 DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci ROW_FORMAT=DYNAMIC COMMENT='用户表';
3. 插入一条User数据
INSERT INTO user(user_name, password, nick_name, phone) values ("jackson0714", "123", "悟空聊架构", "123456")
4. 创建User实体类
package com.jackson0714.springboot.entity;
import lombok.Data;
import java.sql.Timestamp;
@Data
public class User {
private Long userId;
private String userName;
private String password;
private String salt;
private String nickName;
private String phone;
private String avatar;
private String miniOpenId;
private String openId;
private Boolean lockFlag;
private Boolean delFlag;
private Timestamp createTime;
private Timestamp updateTime;
}
需要安装Lombok插件
需要引入Lombok依赖
org.projectlombok
lombok
1.18.12
provided
5. 创建调用User方法的 UserMapper 接口
// @Mapper 或MapperScan 将接口扫描装配到装配容器中
public interface UserMapper {
User getUserById(Long userId);
}
6. 创建接口方法与SQL脚本的映射文件
PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-mapper.dtd">
7. 创建UserController文件
@Api(value = "UserController", description = "用户controller")
@RequestMapping("/v1/client")
@RestController
public class UserController {
@Autowired
UserMapper userMapper;
@ApiOperation(value = "1.根据id查询某个用户")
@ApiImplicitParams({
@ApiImplicitParam(name = "需要查询的用户userId", value = "需要查询的用户userId")
})
@GetMapping("/emp/{userId}")
public User getUser(@PathVariable("userId") Long userId) {
return userMapper.getUserById(userId);
}
}
8. 添加MapperScan注解
@MapperScan(value = "com.jackson0714.springboot.mapper")@SpringBootApplicationpublic class Springboot07DataMybatisApplication { public static void main(String[] args) { SpringApplication.run(Springboot07DataMybatisApplication.class, args); }}
9.在Swagger上测试
10. 查看Druid监控
代码下载:
https://github.com/Jackson0714/study-spring-boot.git
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