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