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/*
GoToSocial
Copyright (C) 2021-2022 GoToSocial Authors admin@gotosocial.org
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package bundb
import (
"github.com/superseriousbusiness/gotosocial/internal/db"
"github.com/uptrace/bun"
)
// whereEmptyOrNull is a convenience function to return a bun WhereGroup that specifies
// that the given column should be EITHER an empty string OR null.
//
// Use it as follows:
//
// q = q.WhereGroup(" AND ", whereEmptyOrNull("whatever_column"))
func whereEmptyOrNull(column string) func(*bun.SelectQuery) *bun.SelectQuery {
return func(q *bun.SelectQuery) *bun.SelectQuery {
return q.
WhereOr("? IS NULL", bun.Ident(column)).
WhereOr("? = ''", bun.Ident(column))
}
}
// updateWhere parses []db.Where and adds it to the given update query.
func updateWhere(q *bun.UpdateQuery, where []db.Where) {
for _, w := range where {
query, args := parseWhere(w)
q = q.Where(query, args...)
}
}
// selectWhere parses []db.Where and adds it to the given select query.
func selectWhere(q *bun.SelectQuery, where []db.Where) {
for _, w := range where {
query, args := parseWhere(w)
q = q.Where(query, args...)
}
}
// deleteWhere parses []db.Where and adds it to the given where query.
func deleteWhere(q *bun.DeleteQuery, where []db.Where) {
for _, w := range where {
query, args := parseWhere(w)
q = q.Where(query, args...)
}
}
// parseWhere looks through the options on a single db.Where entry, and
// returns the appropriate query string and arguments.
func parseWhere(w db.Where) (query string, args []interface{}) {
if w.Not {
if w.Value == nil {
query = "? IS NOT NULL"
args = []interface{}{bun.Ident(w.Key)}
return
}
if w.CaseInsensitive {
query = "LOWER(?) != LOWER(?)"
args = []interface{}{bun.Safe(w.Key), w.Value}
return
}
query = "? != ?"
args = []interface{}{bun.Safe(w.Key), w.Value}
return
}
if w.Value == nil {
query = "? IS NULL"
args = []interface{}{bun.Ident(w.Key)}
return
}
if w.CaseInsensitive {
query = "LOWER(?) = LOWER(?)"
args = []interface{}{bun.Safe(w.Key), w.Value}
return
}
query = "? = ?"
args = []interface{}{bun.Safe(w.Key), w.Value}
return
}
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