# 《Spring Boot集成 MyBatis和 SQL Server实践》
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## 概 述
Spring Boot工程集成 MyBatis来实现 MySQL访问的示例我们见过很多,而最近用到了微软的 SQL Server数据库,于是本文则给出一个完整的 **Spring Boot + MyBatis + SQL Server** 的工程示例。
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## 工程搭建
- 新建 Spring Boot工程
- `pom.xml` 中添加 MyBatis和 SQL Server相关的依赖
```
org.mybatis.spring.boot
mybatis-spring-boot-starter
1.3.2
com.microsoft.sqlserver
sqljdbc4
4.0
```
- 配置 `application.properties`
这里同样主要是对于 MyBatis 和 SQL Server连接相关的配置
```
server.port=89
# mybatis 配置
mybatis.type-aliases-package=cn.codesheep.springbt_mybatis_sqlserver.entity
mybatis.mapper-locations=classpath:mapper/*.xml
mybatis.configuration.map-underscore-to-camel-case=true
## -------------------------------------------------
## SqlServer 配置
spring.datasource.url=jdbc:sqlserver://xxxx:1433;databasename=MingLi
spring.datasource.driver-class-name=com.microsoft.sqlserver.jdbc.SQLServerDriver
spring.datasource.username=xxxx
spring.datasource.password=xxxx
```
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## 建立 SQL Server数据表和实体类
- 首先在 SQL Server数据库中新建数据表 `user_test`作为测试用表
```
DROP TABLE [demo].[user_test]
GO
CREATE TABLE [dbo].[user_test] (
[user_id] int NOT NULL ,
[user_name] varchar(50) NOT NULL ,
[sex] tinyint NOT NULL ,
[created_time] varchar(50) NOT NULL
)
GO
```
- 然后在我们的工程中对应建立的 `User`实体类
其字段和实际数据表的字段一一对应
```
public class User {
private Long userId;
private String userName;
private Boolean sex;
private String createdTime;
public Long getUserId() {
return userId;
}
public void setUserId(Long userId) {
this.userId = userId;
}
public String getUserName() {
return userName;
}
public void setUserName(String userName) {
this.userName = userName;
}
public Boolean getSex() {
return sex;
}
public void setSex(Boolean sex) {
this.sex = sex;
}
public String getCreatedTime() {
return createdTime;
}
public void setCreatedTime(String createdTime) {
this.createdTime = createdTime;
}
}
```
---
## Mybatis Mapper映射配置
- MyBatis映射配置的 XML文件如下:
```
insert into user_test ( user_id, user_name, sex, created_time ) values ( #{userId}, #{userName}, #{sex}, #{createdTime} )
delete from user_test where user_name = #{userName}
```
- 与此同时,这里也给出对应 XML的 DAO接口
```
public interface UserMapper {
List getAllUsers();
int addUser( User user );
int deleteUser( User user );
}
```
为了试验起见,这里给出了 **增 / 删 / 查** 三个数据库操作动作。
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## 编写 Service 和测试Controller
- 上面这些准备工作完成之后,接下来编写数据库 CRUD的 Service类
```
@Service
@Primary
public class UserServiceImpl implements IUserService {
@Autowired
private UserMapper userMapper;
@Override
public List getAllUsers() {
return userMapper.getAllUsers();
}
@Override
public int addUser(User user) {
SimpleDateFormat form = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
user.setCreatedTime( form.format(new Date()) );
return userMapper.addUser( user );
}
@Override
public int deleteUser(User user) {
return userMapper.deleteUser( user );
}
}
```
这里的 Service功能同样主要关于数据表的 **增 / 删 / 查** 三个数据库操作动作。
- 对照着上面的Service,我们编写一个对应接口测试的Controller
```
@RestController
public class UserController {
@Autowired
private IUserService userService;
@RequestMapping(value = "/getAllUser", method = RequestMethod.GET)
public List getAllUser() {
return userService.getAllUsers();
}
@RequestMapping(value = "/addUser", method = RequestMethod.POST)
public int addUser( @RequestBody User user ) {
return userService.addUser( user );
}
@RequestMapping(value = "/deleteUser", method = RequestMethod.POST)
public int deleteUser( @RequestBody User user ) {
return userService.deleteUser( user );
}
}
```
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## 实验测试
- 插入数据
依次用 POSTMAN通过 `Post /addUser`接口插入三条数据:
```
{"userId":1,"userName":"刘能","sex":true}
{"userId":2,"userName":"赵四","sex":false}
{"userId":3,"userName":"王大拿","sex":true}
```
插入完成后去 SQL Server数据库里看一下数据插入情况如下:
![去SQL Server数据库里看一下数据插入情况](https://upload-images.jianshu.io/upload_images/9824247-f8f062d6050a0d5b.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240)
- 查询数据
调用 `Get /getAllUser`接口,获取刚插入的几条数据
![查询数据](https://upload-images.jianshu.io/upload_images/9824247-9220a0bc2146a30e.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240)
- 删除数据
调用 `Post /deleteUser `接口,可以通过用户名来删除对应的用户
![image.png](https://upload-images.jianshu.io/upload_images/9824247-3afb1fbd47878acd.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240)
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## 后 记
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