User.java

/*实现getter和setter方法注解*/
@Data
public class User {private Integer id;private String name;
}

UserMapper.java

@Mapper
public interface CommonUserMapper {/**查询所有*/List<CommonUser> selectAllCommonUser();
}

UserMapper.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapperPUBLIC "-//mybatis.org//DTD Mapper 3.0//EN""https://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.demo.mapper.CommonUserMapper"><select id="selectAllCommonUser" resultType="com.demo.domain.CommonUser">SELECT * FROM common_user</select></mapper>

UserService.java

public interface CommonUserService {/**查询所有*/List<CommonUser> selectAllCommonUser();
}

UserServiceImpl.java

@Service
public class CommonUserServiceImpl implements CommonUserService {@AutowiredCommonUserMapper commonUserMapper;/**查询所有*/@Overridepublic List<CommonUser> selectAllCommonUser() {return commonUserMapper.selectAllCommonUser();}
}

UserController.java

@RestController
public class CommonUserController {@AutowiredCommonUserService commonUserService;@GetMapping("/selectAllCommonUser")public Result selectAllCommonUser(){List<CommonUser> commonUsers = commonUserService.selectAllCommonUser();return Result.success(commonUsers);}
}

<template><div><el-dialog title="更新" :visible.sync="dialogFormVisible" width="40%"><el-form :model="form"><el-form-item label="姓名" label-width="15%"><el-select v-model="form.name" placeholder="请选择姓名" style="width:90%"><el-option v-for="item in names" :key="item.id" :label="item.name" :value="item.name"></el-option></el-select></el-form-item></el-form></el-dialog></div>
</template><script>
import request from '@/utils/request'
export default {data() {return {dialogFormVisible:false,form:{},names:[],}},// 页面加载时调用created(){this.getName()},methods:{getName(){request.get('/selectAllCommonUser').then(res=>{if(res.code === '200'){this.names = res.data}else{this.$message.error('查询失败')}})}}
}
</script>

JSON数据

{"code": "200","message": "请求成功","data": [{"id": 1,"name": "张三"},{"id": 2,"name": "李四"},{"id": 3,"name": "王五"},{"id": 4,"name": "赵六"}]
}

效果