44 lines
897 B
Go
44 lines
897 B
Go
|
// Copyright 2019 The Xorm Authors. All rights reserved.
|
||
|
// Use of this source code is governed by a BSD-style
|
||
|
// license that can be found in the LICENSE file.
|
||
|
|
||
|
package dialects
|
||
|
|
||
|
import (
|
||
|
"fmt"
|
||
|
"strings"
|
||
|
)
|
||
|
|
||
|
// Filter is an interface to filter SQL
|
||
|
type Filter interface {
|
||
|
Do(sql string) string
|
||
|
}
|
||
|
|
||
|
// SeqFilter filter SQL replace ?, ? ... to $1, $2 ...
|
||
|
type SeqFilter struct {
|
||
|
Prefix string
|
||
|
Start int
|
||
|
}
|
||
|
|
||
|
func convertQuestionMark(sql, prefix string, start int) string {
|
||
|
var buf strings.Builder
|
||
|
var beginSingleQuote bool
|
||
|
var index = start
|
||
|
for _, c := range sql {
|
||
|
if !beginSingleQuote && c == '?' {
|
||
|
buf.WriteString(fmt.Sprintf("%s%v", prefix, index))
|
||
|
index++
|
||
|
} else {
|
||
|
if c == '\'' {
|
||
|
beginSingleQuote = !beginSingleQuote
|
||
|
}
|
||
|
buf.WriteRune(c)
|
||
|
}
|
||
|
}
|
||
|
return buf.String()
|
||
|
}
|
||
|
|
||
|
func (s *SeqFilter) Do(sql string) string {
|
||
|
return convertQuestionMark(sql, s.Prefix, s.Start)
|
||
|
}
|