fix: modify InsertOrUpdate method (#5269)

* fix: modify InsertOrUpdate method, Remove the isMulti variable and its associated code

* fix: Delete unnecessary judgment branches

* fix: add modify record into CHANGELOG

CHANGELOG.md

@@ -8,6 +8,7 @@
 - [fix: use of ioutil package](https://github.com/beego/beego/pull/5261)
 - [cache/redis: support skipEmptyPrefix option ](https://github.com/beego/beego/pull/5264)
 - [fix: refactor InsertValue method](https://github.com/beego/beego/pull/5267)
+- [fix: modify InsertOrUpdate method, Remove the isMulti variable and its associated code](https://github.com/beego/beego/pull/5269)
 
 ## ORM refactoring
 - [introducing internal/models pkg](https://github.com/beego/beego/pull/5238)

client/orm/db.go

@@ -552,7 +552,6 @@ func (d *dbBase) InsertOrUpdate(ctx context.Context, q dbQuerier, mi *models.Mod
 		}
 	}
 
-	isMulti := false
 	names := make([]string, 0, len(mi.Fields.DBcols)-1)
 	Q := d.ins.TableQuote()
 	values, _, err := d.collectValues(mi, ind, mi.Fields.DBcols, true, true, &names, a.TZ)
@@ -598,23 +597,14 @@ func (d *dbBase) InsertOrUpdate(ctx context.Context, q dbQuerier, mi *models.Mod
 	qupdates := strings.Join(updates, ", ")
 	columns := strings.Join(names, sep)
 
-	multi := len(values) / len(names)
-
-	if isMulti {
-		qmarks = strings.Repeat(qmarks+"), (", multi-1) + qmarks
-	}
 	// conflitValue maybe is a int,can`t use fmt.Sprintf
 	query := fmt.Sprintf("INSERT INTO %s%s%s (%s%s%s) VALUES (%s) %s "+qupdates, Q, mi.Table, Q, Q, columns, Q, qmarks, iouStr)
 
 	d.ins.ReplaceMarks(&query)
 
-	if isMulti || !d.ins.HasReturningID(mi, &query) {
+	if !d.ins.HasReturningID(mi, &query) {
 		res, err := q.ExecContext(ctx, query, values...)
 		if err == nil {
-			if isMulti {
-				return res.RowsAffected()
-			}
-
 			lastInsertId, err := res.LastInsertId()
 			if err != nil {
 				logs.DebugLog.Println(ErrLastInsertIdUnavailable, ':', err)