达梦判断哪列是自增列|查询自增信息|重构自增列|自增改为sequence

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### Code Reference

• URL:p115 DM8系统管理员手册
• DESC:达梦判断哪列是自增列|查询自增信息|重构自增列|自增改为sequence
• Last Update:2020-7-1 10:58
  • 判断自增列

    left JOIN (SELECT *
    FROM syscolumns t
    WHERE id =
    (SELECT object_id
    FROM dba_objects t
    WHERE 1=1
    AND t.owner = ‘TEST’
    AND t.object_name = ‘WhichCanEncrypt’
    AND object_type = ‘TABLE’)
    ) t7 on (t7.NAME = t4.COLUMN_NAME)

  • 自增列的属性

    CREATE TABLE test.“aIDENT_TABLE” (
    C1 INT IDENTITY(1, 11),
    C2 INT
    );
    SELECT IDENT_CURRENT(‘TEST.aIDENT_TABLE’);
    SELECT IDENT_SEED(‘TEST.aIDENT_TABLE’);
    SELECT IDENT_INCR(‘TEST.aIDENT_TABLE’);

  • 重构自增信息

    SELECT NAME AS c_columnname,
    (decode(info2, 1, ident_incr(‘TEST.WhichCanEncrypt’), NULL, -1, -2) +
    decode(info2, 1, ident_current(‘TEST.WhichCanEncrypt’), NULL, -1, -2)) AS c_identitycurrent,
    decode(info2, 1, ident_seed(‘TEST.WhichCanEncrypt’), NULL, -1, -2) AS c_identitystartvalue,
    decode(info2, 1, ident_incr(‘TEST.WhichCanEncrypt’), NULL, -1, -2) AS c_identitystep
    FROM sys.syscolumns t
    WHERE id =(SELECT object_id
    FROM dba_objects t
    WHERE t.owner = ‘TEST’
    AND t.object_name = ‘WhichCanEncrypt’
    AND object_type = ‘TABLE’)
    AND info2 = 1;

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