73 lines
1.6 KiB
Go
73 lines
1.6 KiB
Go
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// 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 schemas
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import (
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"fmt"
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"strings"
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)
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// enumerate all index types
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const (
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IndexType = iota + 1
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UniqueType
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)
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// Index represents a database index
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type Index struct {
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IsRegular bool
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Name string
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Type int
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Cols []string
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}
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// NewIndex new an index object
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func NewIndex(name string, indexType int) *Index {
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return &Index{true, name, indexType, make([]string, 0)}
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}
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// XName returns the special index name for the table
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func (index *Index) XName(tableName string) string {
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if !strings.HasPrefix(index.Name, "UQE_") &&
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!strings.HasPrefix(index.Name, "IDX_") {
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tableParts := strings.Split(strings.Replace(tableName, `"`, "", -1), ".")
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tableName = tableParts[len(tableParts)-1]
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if index.Type == UniqueType {
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return fmt.Sprintf("UQE_%v_%v", tableName, index.Name)
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}
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return fmt.Sprintf("IDX_%v_%v", tableName, index.Name)
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}
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return index.Name
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}
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// AddColumn add columns which will be composite index
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func (index *Index) AddColumn(cols ...string) {
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index.Cols = append(index.Cols, cols...)
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}
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// Equal return true if the two Index is equal
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func (index *Index) Equal(dst *Index) bool {
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if index.Type != dst.Type {
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return false
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}
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if len(index.Cols) != len(dst.Cols) {
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return false
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}
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for i := 0; i < len(index.Cols); i++ {
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var found bool
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for j := 0; j < len(dst.Cols); j++ {
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if index.Cols[i] == dst.Cols[j] {
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found = true
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break
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}
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}
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if !found {
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return false
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}
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}
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return true
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}
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