Spring 에서 sequence 사용 소결

sequence        ，            ，               。
  1、 create sequence
       create sequence  create any sequence  
  create sequence emp_sequence
  INCREMENT BY 1 --      
  START WITH 1 --  1    
  NOMAXVALUE --       
  NOCYCLE --     ，   
  CACHE 10;
       emp_sequence，     CURRVAL，NEXTVAL
  CURRVAL=  sequence    
  NEXTVAL=  sequence  ，    sequence 
    ：
  emp_sequence.CURRVAL
  emp_sequence.NEXTVAL
      sequence   ：
  -       、snapshot、VIEW  SELECT   
  - INSERT       
  - NSERT   VALUES 
  - UPDATE   SET 
         ：
  INSERT INTO emp VALUES
  (empseq.nextval, 'LEWIS', 'CLERK',7902, SYSDATE, 1200, NULL, 20);
  SELECT empseq.currval FROM DUAL;

         ：
  -    NEXTVAL       ；   NEXTVAL         INCREMENT BY ，         。CURRVAL       sequence  ，      NEXTVAL         CURRVAL，     。  NEXTVAL     sequence  ，                 NEXTVAL，        。
  -     CACHE ，oracle              sequence，       。
  cache      ，oracle       cache。   cache     ，           down （shutdown abort),cache  sequence    .      create sequence    nocache      。
  2、 Alter sequence
       sequence owner，   ALTER ANY sequence      sequence。   alter start      sequence  。      start ，  drop sequence re-create。  ：
  ALTER sequence emp_sequence
  INCREMENT BY 10
  MAXVALUE 10000
  CYCLE --  10000     
  NOCACHE;
    sequence      ：
  sequence_CACHE_ENTRIES =
        cache sequence  。
        Drop sequence
  DROP sequence order_seq;

 
 
 
 
2). Spring applicationContext   sequence
       dataSource，   sequence。  ，  “SQ_AUTHFLOW”      sequence   
  
	<!--   Orcale/sequence -->
	<bean id="sequence"
		class="org.springframework.jdbc.support.incrementer.OracleSequenceMaxValueIncrementer">
		<property name="incrementerName" value="SQ_AUTHFLOW" />
		<property name="dataSource" ref="dataSource" />
	</bean>
  
3）.        
  
public class TAuthFlowDAOImp implements TAuthFlowDAO {	
	private OracleSequenceMaxValueIncrementer sequence;
	public OracleSequenceMaxValueIncrementer getSequence() {
		return sequence;
	}
	public void setSequence(OracleSequenceMaxValueIncrementer sequence) {
		this.sequence = sequence;
	}	
	public String save(final TAuthFlow tAuthFlow) {		
		..
		..
		OracleSequenceMaxValueIncrementer sequence = (OracleSequenceMaxValueIncrementer) AppContext.appContext.getBean("sequence");
		String irc = String.valueOf(sequence.nextIntValue());
		irc = StringUtils.leftPad(irc, 12, "0");  // irc   0  12    
		SimpleDateFormat sdf11 = new SimpleDateFormat("yyyyMMdd");
		String NowDate = sdf11.format(new Date());
		String SeqNo = NowDate + irc;
		final String IfSvrFlow = SeqNo;
		..
		..
		return SeqNo;		
	}
}
  
  AppContext.appContext.getBean("sequence")                。