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package cokr.xit.ens.modules.common.ctgy.sys.mng.service;
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import java.util.HashMap;
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import java.util.Map;
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import javax.transaction.Transactional;
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import org.springframework.stereotype.Service;
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import cokr.xit.ens.modules.common.ctgy.sys.mng.mapper.IKeySequenceMapper;
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import lombok.RequiredArgsConstructor;
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@Service
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@RequiredArgsConstructor
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public class KeySequenceService {
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private final IKeySequenceMapper mapper;
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/**
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* 키 시퀀스 조회
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* @param seqName 키 시퀀스 이름
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* @return Long
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*/
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@Transactional
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public Long getKeySequence(String seqName) {
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Long nextSeq = mapper.selectKeySequence(seqName);
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if(nextSeq == null) {
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nextSeq = 1L;
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}
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Map<String, Object> map = new HashMap<>();
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map.put("seqName", seqName);
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map.put("nextVal", nextSeq);
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mapper.saveKeySequence(map);
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return nextSeq;
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}
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}
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<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
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"http://mybatis.org/dtd/mybatis-3-mapper.dtd">
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<mapper namespace="cokr.xit.ens.modules.common.ctgy.sys.mng.mapper.IKeySequenceMapper">
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<select id="selectKeySequence" parameterType="string" resultType="long">
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/** iup-keyseq-mapper|selectKeySequence-key sequence 조회|julim */
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SELECT next_val + 1
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FROM ens_seq_generator
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WHERE seq_name = #{seqName}
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FOR UPDATE
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</select>
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<insert id="saveKeySequence" parameterType="map">
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/** iup-keyseq-mapper|saveKeySequence-key sequence 저장|julim */
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MERGE
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INTO ens_seq_generator tgt
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USING (SELECT #{seqName} AS seq_name, #{nextVal} AS next_val FROM dual) src
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ON (tgt.seq_name = src.seq_name)
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WHEN MATCHED THEN
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UPDATE SET tgt.next_val = src.next_val
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WHEN NOT MATCHED THEN
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INSERT (seq_name, next_val)
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VALUES (src.seq_name, src.next_val)
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</insert>
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</mapper>
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