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oracle 指定類型和指定位數創建序列號的代碼詳解

瀏覽：160日期：2023-03-12 15:25:06

一、腳本部分

1. 表結構

有注釋

-- Create tablecreate table LDMAXNO(  NOTYPE  VARCHAR2(17) not null,  NOLIMIT VARCHAR2(12) not null,  MAXNO   INTEGER not null);-- Add comments to the table comment on table LDMAXNO  is "產生最大的流水號，所有的號碼從1開始";-- Add comments to the columns comment on column LDMAXNO.NOTYPE  is "含義描述:1、號碼類型";comment on column LDMAXNO.NOLIMIT  is "含義描述:1、號碼限制條件";comment on column LDMAXNO.MAXNO  is "含義描述:1、當前最大值";-- Create/Recreate primary, unique and foreign key constraints alter table LDMAXNO  add constraint PK_LDMAXNO primary key (NOTYPE, NOLIMIT);

2. 函數

  create or replace function CreateMaxNos(cNoType  in ldmaxno.notype%type,       cNoLimit in ldmaxno.nolimit%type)  return integer is  pragma autonomous_transaction;  tMaxNo integer := 0; --初始化賦值等于0，定義返回變量begin  --最大數加1  update LDMaxNo     set MaxNo = MaxNo + 1   where NoType = cNoType     and NoLimit = cNoLimit  Returning MaxNo Into tMaxNo; --取出最大數  If (Sql%Notfound) then    --第一次向數據庫中插入最大數為 1 的記錄    Insert Into LDMaxNo      (NOTYPE, NOLIMIT, MAXNO)    values      (cNoType, cNoLimit, 1);    tMaxNo := 1;  End If;  commit;  return(tMaxNo); --返回結果end CreateMaxNos;/

二、代碼部分

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：產生指定長度的流水號，一個號碼類型一個流水     * @param cNoType 流水號的類型     * @param cNoLength 流水號的長度     * @return 返回產生的流水號碼     */    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：產生指定長度的流水號，一個號碼類型一個流水     *     * @param cNoType   流水號的類型     * @param cNoLength 流水號的長度     * @return 返回產生的流水號碼     */    String createMaxNo(String cNoType, int cNoLength);}

2.4. api實例

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;@Servicepublic class SysMaxNoServiceImpl implements SysMaxNoService {    private final static Logger logger = LoggerFactory.getLogger(SysMaxNoServiceImpl.class);    @Resource    private DullMapper dullMapper;    /**     * 功能：產生指定長度的流水號，一個號碼類型一個流水     *     * @param cNoType   流水號的類型     * @param cNoLength 流水號的長度     * @return 返回產生的流水號碼     */    @Override    public String createMaxNo(String cNoType, int cNoLength) {if ((cNoType == null) || (cNoType.trim().length() <= 0) ||(cNoLength <= 0)) {    logger.info("NoType長度錯誤 {} NoLength錯誤", 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("生成流水號出現異常，請核實！");}String tStr = tMaxNo.toString();//將生成的流水號進行加工處理tStr = LCh(tStr, "0", cNoLength);tReturn = tStr.trim();return tReturn;    }    /**     * 將生成的流水號進行加工處理     * <p>     * 1.判斷是否滿足指定長度，如果不滿足前面用0來補位     * 2.將生成的流水號進行去空格處理     * 3.將最終的流水號進行字符串拼接     * </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.判斷是否滿足指定長度，如果不滿足前面用0來補位iMax = cLen - tLen;for (i = 0; i < iMax; i++) {    tReturn += cChar;}//2.將生成的流水號進行去空格處理//3.將最終的流水號進行字符串拼接tReturn = tReturn.trim() + sourString.trim();return tReturn;    }}

2.5. 控制層

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;/** * 生成指定類型+位數的流水號 * * @Author gblfy * @Date 2022-05-16 20:13 **/@RestControllerpublic class SysMaxNoController {    @Autowired    private SysMaxNoService maxNoService;    /**     * 生成指定類型+位數的流水號     *     * @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);    }}