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B… wei_shuo的个人主页 wei_shuo的学习社区 Hello World Java后端接口编写流程 Java后端接口编写流程更具业务逻辑编写Java后端接口提供给前端访问 实现逻辑流程 POJO实体类编写 Data
Builder
NoArgsConstructor
AllArgsConstructor
TableName(merchant_mcc)
public class MerchantMcc {/*** null | merchant_mcc.id | mbg.generated*/ApiModelProperty(null)TableIdprivate Long id;/*** MCC字段Code | merchant_mcc.code | mbg.generated*/ApiModelProperty(MCC字段Code)private String code;/*** MCC字段Description | merchant_mcc.description | mbg.generated*/ApiModelProperty(MCC字段Description)private String description;
}实体类字段的工具类编写字段常量编写 package com.wei.gen.po;public class MerchantMccCol {public static final String ID id;public static final String CODE code;public static final String DESCRIPTION description;}DAO数据库访问层编写 public interface MerchantMccRepo extends IServiceMerchantMcc {/*** MCC 根据Code查询Description** param queryWrapper* return*/MerchantMcc selectOne(QueryWrapperMerchantMcc queryWrapper);}实现类Impl编写 Slf4j
Repository
public class MerchantMccRepoImpl extends ServiceImplMerchantMccMapper, MerchantMcc implements MerchantMccRepo {private final MerchantMccMapper merchantMccMapper;public MerchantMccRepoImpl(MerchantMccMapper merchantMccMapper) {this.merchantMccMapper merchantMccMapper;}Overridepublic MerchantMcc selectOne(QueryWrapperMerchantMcc queryWrapper) {return merchantMccMapper.selectOne(queryWrapper);}
}Mapper编写实现对数据库的操作 Mapper
public interface MerchantMccMapper extends BaseMapperMerchantMcc {/*** This method was generated by MyBatis Generator.* This method corresponds to the database table merchant_mcc** mbg.generated*/MerchantMcc selectByPrimaryKey(Long id);
}Mapper.xml编写自定义编写SQL语句业务逻辑 id属性指定Mapper.xml文件中的SQL语句对应的Java接口方法名称这个方法将会执行相应的SQL语句并返回执行结果 type属性指定Mapper.xml文件中的Java类对应的实体类名称这个实体类包含了与SQL语句相对应的属性和方法用于将执行结果转换为Java对象 ?xml version1.0 encodingUTF-8?
!DOCTYPE mapper PUBLIC -//mybatis.org//DTD Mapper 3.0//EN http://mybatis.org/dtd/mybatis-3-mapper.dtd
mapper namespacecom.wei.gen.dao.MerchantMccMapper/mapperService层业务逻辑编写 /*** MCC 根据Code查询Description*/public String getDescriptionByCode(String code) {if (code null || code.isEmpty()){throw new ManageException(Code不能为空);}MerchantMcc merchantMcc merchantMccRepo.selectOne(new QueryWrapperMerchantMcc().eq(code, code));if (merchantMcc null) {throw new ManageException(Code不存在);}return merchantMcc.getDescription();}Controller层接口编写 RestController
Slf4j
RequestMapping(common)
public class SystemCommonEndpoint {Resourceprivate CommonService commonService;/*** MCC 根据Code查询Description*/GetMapping(/search)ApiOperation(MCC根据Code查询Description)public ResultString searchDescription(RequestParam(code) String code) {String description commonService.getDescriptionByCode(code);return Result.succ(description);}
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