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perf(storage): pair all SELECT true
with LIMIT 1
Apparently, postgresql isn't smart enough to realize that once a true value value is found as part of a `SELECT true`, there is no need to scan the rest of the table, so we have to make this explicit. We could also have used the `SELECT EXISTS(…)` construct, but it's more verbose and I don't like it.
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6 changed files with 14 additions and 14 deletions
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@ -31,7 +31,7 @@ func (s *Storage) CategoryTitleExists(userID int64, title string) bool {
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// CategoryIDExists checks if the given category exists into the database.
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func (s *Storage) CategoryIDExists(userID, categoryID int64) bool {
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var result bool
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query := `SELECT true FROM categories WHERE user_id=$1 AND id=$2`
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query := `SELECT true FROM categories WHERE user_id=$1 AND id=$2 LIMIT 1`
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s.db.QueryRow(query, userID, categoryID).Scan(&result)
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return result
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}
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