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- 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 {
- return strings.Replace(sql, "`", dialect.QuoteStr(), -1)
- }
- // 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.QuoteStr() + content + q.dialect.QuoteStr()
- }
- 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
- }
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