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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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10
database/upgrades/2019-05-16-message-delete-cascade.go
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@ -10,9 +10,14 @@ func init() {
// SQLite doesn't support constraint updates, but it isn't that careful with constraints anyway.
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
WHERE table_name='message' AND constraint_name='message_chat_jid_fkey');`)
var exists bool
_ = res.Scan(&exists)
if exists {
_, err := tx.Exec("ALTER TABLE message DROP CONSTRAINT IF EXISTS message_chat_jid_fkey")
if err != nil {
return 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)
@ -20,6 +25,7 @@ func init() {
if err != nil {
return err
}
}
return nil
}}
}