Mybatis-Plus的配置和基本使用
基本配置
首先新建一个springboot项目,然后导入数据库驱动,lombok和mybatis-plus依赖:
<!-- 数据库驱动 -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
</dependency>
<!-- lombok -->
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
</dependency>
<!-- mybatis-plus -->
<!-- mybatis-plus 是自己开发,并非官方的! -->
<dependency>
<groupId>com.baomidou</groupId>
<artifactId>mybatis-plus-boot-starter</artifactId>
<version>3.2.0</version>
</dependency>
然后再编写配置文件application.yml:
server:
port: 8081
spring:
datasource:
username: ******
password: ******
url: jdbc:mysql://localhost:3306/mybatis_plus?useSSL=false&useUnicode=true&characterEncoding=utf-8&serverTimezone=GMT%2B8
driver-class-name: com.mysql.cj.jdbc.Driver
# 配置日志
mybatis-plus:
configuration:
log-impl: org.apache.ibatis.logging.stdout.StdOutImpl
即配置数据源连接数据库的参数(用户名密码url等)
这里使用的是一个新建的数据库,通过Mybatis-Plus文档的操作新建user表:
最后在启动类或者是配置类中加入@MapperScan
注解:
@MapperScan("com.example.mapper") <---
@SpringBootApplication
public class DemoApplication {
public static void main(String[] args) {
SpringApplication.run(DemoApplication.class, args);
}
}
简单使用
我们先编写user表对应的实体类:
@Data
@AllArgsConstructor
@NoArgsConstructor
public class User {
private Long id;
private String name;
private Integer age;
private String email;
}
然后编写对应的Mapper接口:
public interface UserMapper extends BaseMapper<User> {
}
然后即可在测试类中进行测试:
@SpringBootTest
public class UserTest {
@Autowired
private UserMapper userMapper;
@Test
public void testSelect() {
System.out.println(("----- selectAll method test ------"));
List<User> userList = userMapper.selectList(null);
userList.forEach(System.out::println);
}
}
运行结果:
User(id=1, name=Jone, age=18, email=test1@baomidou.com)
User(id=2, name=Jack, age=20, email=test2@baomidou.com)
User(id=3, name=Tom, age=28, email=test3@baomidou.com)
User(id=4, name=Sandy, age=21, email=test4@baomidou.com)
User(id=5, name=Billie, age=24, email=test5@baomidou.com)
代码生成器
导入依赖
<dependency>
<groupId>com.baomidou</groupId>
<artifactId>mybatis-plus-generator</artifactId>
<version>3.2.0</version>
</dependency>
<dependency>
<groupId>org.apache.velocity</groupId>
<artifactId>velocity-engine-core</artifactId>
<version>2.0</version>
</dependency>
生成器代码:
@SpringBootTest
public class CodeGenerator {
@Test
public void generate() {
// 1、创建代码生成器
AutoGenerator mpg = new AutoGenerator();
// 2、全局配置
GlobalConfig gc = new GlobalConfig();
String projectPath = System.getProperty("user.dir");
//System.out.println(projectPath);
gc.setOutputDir(projectPath + "/src/main/java");
gc.setAuthor("Zeng");
gc.setOpen(false); //生成后是否打开资源管理器
gc.setFileOverride(false); //重新生成时文件是否覆盖
/*
* mp生成service层代码,默认接口名称第一个字母有 I
* UcenterService
* */
gc.setServiceName("%sService"); //去掉Service接口的首字母I
gc.setIdType(IdType.ID_WORKER_STR); //主键策略
gc.setDateType(DateType.ONLY_DATE);//定义生成的实体类中日期类型
gc.setSwagger2(true);//开启Swagger2模式,如果开启则也代表着需要导入swagger的配置
mpg.setGlobalConfig(gc);
// 3、数据源配置
DataSourceConfig dsc = new DataSourceConfig();
dsc.setUrl("jdbc:mysql://localhost:3306/mybatis_plus?serverTimeZone=GMT%2B8");
dsc.setDriverName("com.mysql.cj.jdbc.Driver");
dsc.setUsername("root");
dsc.setPassword("root");
dsc.setDbType(DbType.MYSQL);
mpg.setDataSource(dsc);
// 4、包配置
PackageConfig pc = new PackageConfig();
pc.setModuleName("example"); //模块名
pc.setParent("com");
pc.setController("controller");
pc.setEntity("entity");
pc.setService("service");
pc.setMapper("mapper");
mpg.setPackageInfo(pc);
// 5、策略配置
StrategyConfig strategy = new StrategyConfig();
// 设置要映射的表名
strategy.setInclude("user");
strategy.setNaming(NamingStrategy.underline_to_camel);//数据库表映射到实体的命名策略
strategy.setTablePrefix(pc.getModuleName() + "_"); //生成实体时去掉表前缀
strategy.setColumnNaming(NamingStrategy.underline_to_camel);//数据库表字段映射到实体的命名策略
strategy.setEntityLombokModel(true); // lombok 模型 @Accessors(chain = true) setter链式操作
strategy.setRestControllerStyle(true); //restful api风格控制器
strategy.setControllerMappingHyphenStyle(true); //url中驼峰转连字符
mpg.setStrategy(strategy);
// 6、执行
mpg.execute();
}
}
运行结果:
另外swagger2的配置:
<dependency>
<groupId>io.springfox</groupId>
<artifactId>springfox-swagger-ui</artifactId>
<version>3.0.0</version>
</dependency>
<dependency>
<groupId>io.springfox</groupId>
<artifactId>springfox-swagger2</artifactId>
<version>3.0.0</version>
</dependency>
查看生成的User实体类:
@Data
@EqualsAndHashCode(callSuper = false)
@Accessors(chain = true)
@ApiModel(value="User对象", description="")
public class User implements Serializable {
private static final long serialVersionUID=1L;
@ApiModelProperty(value = "主键ID")
@TableId(value = "id", type = IdType.ID_WORKER_STR)
private Long id;
@ApiModelProperty(value = "姓名")
private String name;
@ApiModelProperty(value = "年龄")
private Integer age;
@ApiModelProperty(value = "邮箱")
private String email;
}
进行相应的查询测试:
// 测试代码
@RestController
@RequestMapping("/example/user")
public class UserController {
@Autowired
private UserService userService;
@RequestMapping("/{id}")
public User getUserById(@PathVariable int id) {
User user = userService.getById(id);
return user;
}
}
测试结果: