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Check if constraint exists before trying to delete

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This commit is contained in:
Tulir Asokan 2020-04-02 21:37:51 +03:00
parent 9b01166f0c
commit 6a42de73d1
1 changed files with 13 additions and 7 deletions
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20
database/upgrades/2019-05-16-message-delete-cascade.go
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@ -10,15 +10,21 @@ func init() {
// SQLite doesn't support constraint updates, but it isn't that careful with constraints anyway. // SQLite doesn't support constraint updates, but it isn't that careful with constraints anyway.
return nil return nil
} }
_, err := tx.Exec("ALTER TABLE message DROP CONSTRAINT message_chat_jid_fkey") res, _ := tx.Query(`SELECT EXISTS(SELECT constraint_name FROM information_schema.table_constraints
if err != nil { WHERE table_name='message' AND constraint_name='message_chat_jid_fkey');`)
return nil var exists bool
} _ = res.Scan(&exists)
_, err = tx.Exec(`ALTER TABLE message ADD CONSTRAINT message_chat_jid_fkey if exists {
_, err := tx.Exec("ALTER TABLE message DROP CONSTRAINT IF EXISTS message_chat_jid_fkey")
if err != nil {
return err
}
_, err = tx.Exec(`ALTER TABLE message ADD CONSTRAINT message_chat_jid_fkey
FOREIGN KEY (chat_jid, chat_receiver) REFERENCES portal(jid, receiver) FOREIGN KEY (chat_jid, chat_receiver) REFERENCES portal(jid, receiver)
ON DELETE CASCADE`) ON DELETE CASCADE`)
if err != nil { if err != nil {
return err return err
}
} }
return nil return nil
}} }}