30 lines
785 B
PL/PgSQL
30 lines
785 B
PL/PgSQL
/*
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CREATE TABLE dbreplicasyncverifier (lastupdate date)
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;
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INSERT INTO dbreplicasyncverifier values (to_date('1900-01-01 00:00:00', 'yyyy-mm-dd HH24:MI:SS'))
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;
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*/
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CREATE OR REPLACE FUNCTION forbid_multiple_rows_in_dbreplicasyncverifier()
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RETURNS TRIGGER AS $$
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BEGIN
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-- Check if the table already contains a row
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IF (SELECT COUNT(*) FROM dbreplicasyncverifier) > 0 THEN
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RAISE EXCEPTION 'Table can only contain one row.';
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END IF;
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RETURN NEW;
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END;
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$$ LANGUAGE plpgsql
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;
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CREATE TRIGGER single_row_only_trigger_dbreplicasyncverifier
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BEFORE INSERT ON dbreplicasyncverifier
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FOR EACH ROW
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EXECUTE FUNCTION forbid_multiple_rows_in_dbreplicasyncverifier()
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;
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CREATE OR REPLACE RULE delete_dbreplicasyncverifier AS ON DELETE TO dbreplicasyncverifier DO INSTEAD NOTHING
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;
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