一、脚本部分

1. 表结构

有注释

CREATE TABLE `ldmaxno` (`notype` varchar(60) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL COMMENT '号码类型',`nolimit` varchar(60) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL COMMENT '号码限制条件',`maxno` int NOT NULL COMMENT '当前最大值',PRIMARY KEY (`notype`,`nolimit`) USING BTREE
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb3 ROW_FORMAT=COMPACT COMMENT='流水号编码表';

无注释

CREATE TABLE `ldmaxno` (`notype` varchar(60) NOT NULL,`nolimit` varchar(60) NOT NULL,`maxno` int(11) NOT NULL,PRIMARY KEY (`notype`,`nolimit`) USING BTREE
) ENGINE=InnoDB DEFAULT CHARSET=utf8 ROW_FORMAT=COMPACT;

2. 函数

CREATE DEFINER=`root`@`localhost` FUNCTION `CreateMaxNo`(cNoType VARCHAR ( 60 ),cNoLimit VARCHAR ( 60 )) RETURNS int(11)
BEGINDECLAREtMaxNo INTEGER DEFAULT 0; -- 初始化赋值等于0，SET tMaxNo = ( SELECT MaxNo FROM LDMaxNo WHERE NoType = cNoType AND NoLimit = cNoLimit FOR UPDATE );IFisnull( tMaxNo ) = 1 THENINSERT INTO LDMaxNo ( NOTYPE, NOLIMIT, MAXNO )VALUES( cNoType, cNoLimit, 1 );SET tMaxNo = 1;ELSE SET tMaxNo = tMaxNo + 1;UPDATE LDMaxNo SET MaxNo = tMaxNo WHERENoType = cNoType AND NoLimit = cNoLimit;END IF;RETURN tMaxNo;END

二、代码部分

2.1. xml

DullMapper.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.gblfy.business.mapper.DullMapper"><select id="getMaxNo" resultType="java.lang.String">select createmaxno(#{cNoType},#{cNoLength}) from dual</select>
</mapper>

2.2. 接口

DullMapper.java

package com.gblfy.business.mapper;import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import org.apache.ibatis.annotations.Param;public interface DullMapper extends BaseMapper {/*** 功能：产生指定长度的流水号，一个号码类型一个流水* @param cNoType 流水号的类型* @param cNoLength 流水号的长度* @return 返回产生的流水号码*/String getMaxNo(@Param("cNoType") String cNoType, @Param("cNoLength") int cNoLength);
}

2.3. api接口

package com.gblfy.business.service;public interface SysMaxNoService {/*** 功能：产生指定长度的流水号，一个号码类型一个流水** @param cNoType   流水号的类型* @param cNoLength 流水号的长度* @return 返回产生的流水号码*/String createMaxNo(String cNoType, int cNoLength);
}

2.4. api实例

package com.gblfy.business.service.impl;import com.gblfy.business.mapper.DullMapper;
import com.gblfy.business.service.SysMaxNoService;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Service;import javax.annotation.Resource;
import java.math.BigInteger;@Service
public class SysMaxNoServiceImpl implements SysMaxNoService {private final static Logger logger = LoggerFactory.getLogger(SysMaxNoServiceImpl.class);@Resourceprivate DullMapper dullMapper;/*** 功能：产生指定长度的流水号，一个号码类型一个流水** @param cNoType   流水号的类型* @param cNoLength 流水号的长度* @return 返回产生的流水号码*/@Overridepublic String createMaxNo(String cNoType, int cNoLength) {if ((cNoType == null) || (cNoType.trim().length() <= 0) ||(cNoLength <= 0)) {logger.info("NoType长度错误 {} NoLength错误", cNoType, cNoLength);return null;}cNoType = cNoType.toUpperCase();String tReturn = "";String cNoLimit = "SN";BigInteger tMaxNo = new BigInteger("0");tReturn = cNoLimit;try {String result = dullMapper.getMaxNo(cNoType, cNoLength);tMaxNo = new BigInteger(result);} catch (Exception e) {e.printStackTrace();logger.info("生成流水号出现异常，请核实！");}String tStr = tMaxNo.toString();//将生成的流水号进行加工处理tStr = LCh(tStr, "0", cNoLength);tReturn = tStr.trim();return tReturn;}/*** 将生成的流水号进行加工处理* <p>* 1.判断是否满足指定长度，如果不满足前面用0来补位* 2.将生成的流水号进行去空格处理* 3.将最终的流水号进行字符串拼接* </P>** @param sourString* @param cChar* @param cLen* @return*/private String LCh(String sourString, String cChar, int cLen) {int tLen = sourString.length();int i, iMax;String tReturn = "";if (tLen >= cLen) {return sourString;}//1.判断是否满足指定长度，如果不满足前面用0来补位iMax = cLen - tLen;for (i = 0; i < iMax; i++) {tReturn += cChar;}//2.将生成的流水号进行去空格处理//3.将最终的流水号进行字符串拼接tReturn = tReturn.trim() + sourString.trim();return tReturn;}
}

2.5. 控制层

package com.gblfy.business.controller;import com.gblfy.business.service.SysMaxNoService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;/*** 生成指定类型+位数的流水号** @Author gblfy* @Date 2022-05-16 20:13**/
@RestController
public class SysMaxNoController {@Autowiredprivate SysMaxNoService maxNoService;/*** 生成指定类型+位数的流水号** @param cNoType* @param cNoLength* @return*/@GetMapping("/generate/serial/number")public String generateSerialNumber(@RequestParam(name = "cNoType", required = false, defaultValue = "cNoType") String cNoType,@RequestParam int cNoLength) {return maxNoService.createMaxNo(cNoType, cNoLength);}
}

三、测试

3.1. 效果图