Skip simple protocol when using prepare stmt, close go-gorm/gorm#5380

Author: jinzhu

migrator.go

@@ -477,7 +477,9 @@ func (m Migrator) GetRows(currentSchema interface{}, table interface{}) (*sql.Ro
 
 	return m.DB.Session(&gorm.Session{}).Table(name).Limit(1).Scopes(func(d *gorm.DB) *gorm.DB {
 		// use simple protocol
-		d.Statement.Vars = append(d.Statement.Vars, pgx.QuerySimpleProtocol(true))
+		if !m.DB.PrepareStmt {
+			d.Statement.Vars = append(d.Statement.Vars, pgx.QuerySimpleProtocol(true))
+		}
 		return d
 	}).Rows()
 }