45 lines
734 B
Go
45 lines
734 B
Go
package core
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import (
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"sort"
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)
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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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// database index
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type Index struct {
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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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// add columns which will be composite index
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func (index *Index) AddColumn(cols ...string) {
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for _, col := range cols {
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index.Cols = append(index.Cols, col)
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}
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}
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func (index *Index) Equal(dst *Index) bool {
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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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sort.StringSlice(index.Cols).Sort()
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sort.StringSlice(dst.Cols).Sort()
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for i := 0; i < len(index.Cols); i++ {
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if index.Cols[i] != dst.Cols[i] {
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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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// new an index
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func NewIndex(name string, indexType int) *Index {
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return &Index{name, indexType, make([]string, 0)}
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}
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