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Oracle PL/SQL/Sequence/Sequence Properties - История изменений
2026-04-07T01:21:42Z
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в 13:45, 26 мая 2010
2010-05-26T13:45:19Z
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Admin: 1 версия
2010-05-26T09:55:15Z
<p>1 версия</p>
<p><b>Новая страница</b></p><div>==A CYCLE sequence==<br />
<br />
<br />
<br />
<br />
<!-- start source code --><br />
<br />
<source lang="sql"><br />
<br />
SQL><br />
SQL> -- A CYCLE sequence<br />
SQL><br />
SQL><br />
SQL> CREATE SEQUENCE StudentNumSeq<br />
2 INCREMENT BY 50000<br />
3 START WITH 50000<br />
4 MAXVALUE 99999<br />
5 NOCACHE<br />
6 CYCLE;<br />
Sequence created.<br />
SQL><br />
SQL><br />
SQL> select studentNumSeq.nextVal from dual;<br />
NEXTVAL<br />
----------<br />
50000<br />
SQL> select studentNumSeq.nextVal from dual;<br />
NEXTVAL<br />
----------<br />
1<br />
SQL> select studentNumSeq.nextVal from dual;<br />
NEXTVAL<br />
----------<br />
50001<br />
SQL><br />
SQL><br />
SQL> drop sequence studentNumSeq;<br />
Sequence dropped.<br />
SQL><br />
SQL><br />
<br />
</source><br />
<br />
<br />
<br />
<br />
==A NOCYCLE sequence==<br />
<br />
<br />
<br />
<br />
<!-- start source code --><br />
<br />
<source lang="sql"><br />
<br />
SQL> -- A NOCYCLE sequence<br />
SQL><br />
SQL><br />
SQL> CREATE SEQUENCE StudentNumSeq<br />
2 INCREMENT BY 50000<br />
3 START WITH 50000<br />
4 MAXVALUE 99999<br />
5 NOCACHE<br />
6 NOCYCLE;<br />
Sequence created.<br />
SQL><br />
SQL><br />
SQL> select studentNumSeq.nextVal from dual;<br />
NEXTVAL<br />
----------<br />
50000<br />
SQL> select studentNumSeq.nextVal from dual;<br />
select studentNumSeq.nextVal from dual<br />
*<br />
ERROR at line 1:<br />
ORA-08004: sequence STUDENTNUMSEQ.NEXTVAL exceeds MAXVALUE and cannot be instantiated<br />
<br />
SQL> select studentNumSeq.nextVal from dual;<br />
select studentNumSeq.nextVal from dual<br />
*<br />
ERROR at line 1:<br />
ORA-08004: sequence STUDENTNUMSEQ.NEXTVAL exceeds MAXVALUE and cannot be instantiated<br />
<br />
SQL><br />
SQL><br />
SQL> drop sequence studentNumSeq;<br />
Sequence dropped.<br />
SQL><br />
SQL><br />
<br />
</source><br />
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<br />
<br />
<br />
==Sequence cache option==<br />
<br />
<br />
<br />
<br />
<!-- start source code --><br />
<br />
<source lang="sql"><br />
<br />
SQL><br />
SQL> -- the cache option specifies how many sequence values will be stored in memory for <br />
faster access<br />
SQL><br />
SQL><br />
SQL> CREATE SEQUENCE mySequence<br />
2 MINVALUE 1<br />
3 MAXVALUE 999999999999999999999999999<br />
4 START WITH 1<br />
5 INCREMENT BY 1<br />
6 CACHE 20;<br />
Sequence created.<br />
SQL><br />
SQL> select mySequence.nextval from dual;<br />
NEXTVAL<br />
----------<br />
1<br />
SQL> select mySequence.nextval from dual;<br />
NEXTVAL<br />
----------<br />
2<br />
SQL> select mySequence.nextval from dual;<br />
NEXTVAL<br />
----------<br />
3<br />
SQL> select mySequence.nextval from dual;<br />
NEXTVAL<br />
----------<br />
4<br />
SQL><br />
SQL> drop sequence mySequence;<br />
Sequence dropped.<br />
SQL><br />
SQL><br />
<br />
</source></div>
Admin