1.pom
<dependencies>
<!-- springboot-->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.13</version>
<scope>test</scope>
</dependency>
<!-- mybatis-plus-->
<dependency>
<groupId>com.baomidou</groupId>
<artifactId>mybatis-plus-boot-starter</artifactId>
<version>3.1.2</version>
</dependency>
<!-- lombok-->
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
</dependency>
<!--Mysql数据库驱动-->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>8.0.15</version>
</dependency>
</dependencies>
2.实体
@Data
public class User {
private Long id;
private String name;
private Integer age;
private String email;
}
3.mapper
public interface UserMapper extends BaseMapper<User> {
}
4.启动类
@SpringBootApplication
@MapperScan("com.example.demo.mapper")
public class DemoApplication {
public static void main(String[] args) {
SpringApplication.run(DemoApplication.class, args);
}
}
使用细节:
userMapper.selectBatchIds(Arrays.asList(1,2,3));
Map map = new HashMap<String,Object>();
map.put("name","Tom");
map.put("age",28);
userMapper.selectByMap(map);
SELECT id,name,age,email FROM user WHERE name = ? AND age = ?
QueryWrapper 里的方法可以写复杂的sql 具体参看mybatis-plus 条件构造器
QueryWrapper<User> wrapper = new QueryWrapper();
wrapper.eq("name","Tom").eq("age",28);
userMapper.selectOne(wrapper);
dev 表示开发环境
自动生成代码
package com.example.demo;
import com.baomidou.mybatisplus.annotation.DbType;
import com.baomidou.mybatisplus.annotation.FieldFill;
import com.baomidou.mybatisplus.annotation.IdType;
import com.baomidou.mybatisplus.generator.AutoGenerator;
import com.baomidou.mybatisplus.generator.config.DataSourceConfig;
import com.baomidou.mybatisplus.generator.config.GlobalConfig;
import com.baomidou.mybatisplus.generator.config.PackageConfig;
import com.baomidou.mybatisplus.generator.config.StrategyConfig;
import com.baomidou.mybatisplus.generator.config.po.TableFill;
import com.baomidou.mybatisplus.generator.config.rules.DateType;
import com.baomidou.mybatisplus.generator.config.rules.NamingStrategy;
import java.util.ArrayList;
public class kuangCode {
public static void main(String[] args) {
// 需要构建一个 代码自动生成器 对象
AutoGenerator mpg = new AutoGenerator();
// 配置策略
// 1、全局配置
GlobalConfig gc = new GlobalConfig();
String projectPath = System.getProperty("user.dir");
gc.setOutputDir(projectPath + "/src/main/java");
gc.setAuthor("zyf");
gc.setOpen(false);
gc.setFileOverride(false); // 是否覆盖
gc.setServiceName("%sService"); // 去Service的I前缀
gc.setIdType(IdType.ID_WORKER);
gc.setDateType(DateType.ONLY_DATE);
gc.setSwagger2(true);
mpg.setGlobalConfig(gc);
//2、设置数据源
DataSourceConfig dsc = new DataSourceConfig();
dsc.setUrl("jdbc:mysql://localhost:3306/mall?useUnicode=true&characterEncoding=utf-8&serverTimezone=Asia/Shanghai");
dsc.setDriverName("com.mysql.cj.jdbc.Driver");
dsc.setUsername("root");
dsc.setPassword("1234");
dsc.setDbType(DbType.MYSQL);
mpg.setDataSource(dsc);
//3、包的配置
PackageConfig pc = new PackageConfig();
pc.setModuleName("blog");
pc.setParent("com.zyf");
pc.setEntity("entity");
pc.setMapper("mapper");
pc.setService("service");
pc.setController("controller");
mpg.setPackageInfo(pc);
//4、策略配置
StrategyConfig strategy = new StrategyConfig();
strategy.setInclude("user"); // 设置要映射的表名
strategy.setNaming(NamingStrategy.underline_to_camel);
strategy.setColumnNaming(NamingStrategy.underline_to_camel);
strategy.setEntityLombokModel(true); // 自动lombok;
strategy.setLogicDeleteFieldName("deleted");
// 自动填充配置
TableFill gmtCreate = new TableFill("gmt_create", FieldFill.INSERT);
TableFill gmtModified = new TableFill("gmt_modified", FieldFill.INSERT_UPDATE);
ArrayList<TableFill> tableFills = new ArrayList<>();
tableFills.add(gmtCreate);
tableFills.add(gmtModified);
strategy.setTableFillList(tableFills);
// 乐观锁
// strategy.setVersionFieldName("version");
// strategy.setRestControllerStyle(true);
// strategy.setControllerMappingHyphenStyle(true); //
// localhost:
// 8080 / hello_id_2
mpg.setStrategy(strategy);
mpg.execute(); //执行
}
}
<dependency>
<groupId>com.baomidou</groupId>
<artifactId>mybatis-plus-generator</artifactId>
<version>3.0.7.1</version>
</dependency>
<dependency>
<groupId>org.apache.velocity</groupId>
<artifactId>velocity-engine-core</artifactId>
<version>2.2</version>
</dependency>