人事系统开发
48092cab42
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42 lines
1.5 KiB
SQL
42 lines
1.5 KiB
SQL
# Make mrbs_entry.repeat_id a foreign key
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# Previously repeat_id was set to zero if there was no repeat.
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# However this breaks our foreign key constraint so we have to modify
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# the repeat_id column before we can create the foreign key.
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/* Temporary copy of timestamp column */
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ALTER TABLE %DB_TBL_PREFIX%entry
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ADD COLUMN saved_ts DATETIME;
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UPDATE %DB_TBL_PREFIX%entry SET saved_ts=timestamp;
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ALTER TABLE %DB_TBL_PREFIX%entry
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MODIFY COLUMN repeat_id int DEFAULT NULL;
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UPDATE %DB_TBL_PREFIX%entry
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SET repeat_id=NULL WHERE repeat_id=0;
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# Tidy up the database getting rid of any zombie rows which would prevent
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# the foreign key being created. Note that these rows will not be visible to users
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# and admins through MRBS. They have most likely been created when a row has been
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# deleted from a table using a database admin tool, rather than through MRBS. Of course,
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# foreign keys will stop this happening in the future.
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DELETE FROM %DB_TBL_PREFIX%entry
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WHERE repeat_id IS NOT NULL
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AND repeat_id NOT IN (SELECT id FROM %DB_TBL_PREFIX%repeat);
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DELETE FROM %DB_TBL_PREFIX%repeat
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WHERE id NOT IN (SELECT repeat_id FROM %DB_TBL_PREFIX%entry WHERE repeat_id IS NOT NULL);
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ALTER TABLE %DB_TBL_PREFIX%entry
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ADD FOREIGN KEY (repeat_id)
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REFERENCES %DB_TBL_PREFIX%repeat(id)
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ON UPDATE CASCADE
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ON DELETE CASCADE;
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/* Put the table back to how it was */
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UPDATE %DB_TBL_PREFIX%entry SET timestamp=saved_ts;
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ALTER TABLE %DB_TBL_PREFIX%entry
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DROP COLUMN saved_ts;
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