mirror of https://github.com/go-gitea/gitea.git
85 lines
1.9 KiB
Go
85 lines
1.9 KiB
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 core
|
|
|
|
import (
|
|
"fmt"
|
|
"strings"
|
|
)
|
|
|
|
// Filter is an interface to filter SQL
|
|
type Filter interface {
|
|
Do(sql string, dialect Dialect, table *Table) string
|
|
}
|
|
|
|
// QuoteFilter filter SQL replace ` to database's own quote character
|
|
type QuoteFilter struct {
|
|
}
|
|
|
|
func (s *QuoteFilter) Do(sql string, dialect Dialect, table *Table) string {
|
|
dummy := dialect.Quote("")
|
|
if len(dummy) != 2 {
|
|
return sql
|
|
}
|
|
prefix, suffix := dummy[0], dummy[1]
|
|
raw := []byte(sql)
|
|
for i, cnt := 0, 0; i < len(raw); i = i + 1 {
|
|
if raw[i] == '`' {
|
|
if cnt%2 == 0 {
|
|
raw[i] = prefix
|
|
} else {
|
|
raw[i] = suffix
|
|
}
|
|
cnt++
|
|
}
|
|
}
|
|
return string(raw)
|
|
}
|
|
|
|
// IdFilter filter SQL replace (id) to primary key column name
|
|
type IdFilter struct {
|
|
}
|
|
|
|
type Quoter struct {
|
|
dialect Dialect
|
|
}
|
|
|
|
func NewQuoter(dialect Dialect) *Quoter {
|
|
return &Quoter{dialect}
|
|
}
|
|
|
|
func (q *Quoter) Quote(content string) string {
|
|
return q.dialect.Quote(content)
|
|
}
|
|
|
|
func (i *IdFilter) Do(sql string, dialect Dialect, table *Table) string {
|
|
quoter := NewQuoter(dialect)
|
|
if table != nil && len(table.PrimaryKeys) == 1 {
|
|
sql = strings.Replace(sql, " `(id)` ", " "+quoter.Quote(table.PrimaryKeys[0])+" ", -1)
|
|
sql = strings.Replace(sql, " "+quoter.Quote("(id)")+" ", " "+quoter.Quote(table.PrimaryKeys[0])+" ", -1)
|
|
return strings.Replace(sql, " (id) ", " "+quoter.Quote(table.PrimaryKeys[0])+" ", -1)
|
|
}
|
|
return sql
|
|
}
|
|
|
|
// SeqFilter filter SQL replace ?, ? ... to $1, $2 ...
|
|
type SeqFilter struct {
|
|
Prefix string
|
|
Start int
|
|
}
|
|
|
|
func (s *SeqFilter) Do(sql string, dialect Dialect, table *Table) string {
|
|
segs := strings.Split(sql, "?")
|
|
size := len(segs)
|
|
res := ""
|
|
for i, c := range segs {
|
|
if i < size-1 {
|
|
res += c + fmt.Sprintf("%s%v", s.Prefix, i+s.Start)
|
|
}
|
|
}
|
|
res += segs[size-1]
|
|
return res
|
|
}
|