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addition.go
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addition.go
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package sqlbuilder
import (
"sort"
)
type Additions []Addition
type Addition interface {
SqlExpr
AdditionType() AdditionType
}
type AdditionType int
const (
AdditionJoin AdditionType = iota
AdditionWhere
AdditionGroupBy
AdditionCombination
AdditionOrderBy
AdditionLimit
AdditionOnConflict
AdditionOther
AdditionComment
)
func WriteAdditions(e *Ex, additions ...Addition) {
finalAdditions := make(Additions, 0, len(additions))
for i := range additions {
if IsNilExpr(additions[i]) {
continue
}
finalAdditions = append(finalAdditions, additions[i])
}
if len(finalAdditions) == 0 {
return
}
sort.Sort(finalAdditions)
for i := range finalAdditions {
e.WriteQueryByte('\n')
e.WriteExpr(finalAdditions[i])
}
}
func (additions Additions) Len() int {
return len(additions)
}
func (additions Additions) Less(i, j int) bool {
return additions[i].AdditionType() < additions[j].AdditionType()
}
func (additions Additions) Swap(i, j int) {
additions[i], additions[j] = additions[j], additions[i]
}
func AsAddition(expr SqlExpr) *OtherAddition {
return &OtherAddition{
SqlExpr: expr,
}
}
type OtherAddition struct {
SqlExpr
}
func (OtherAddition) AdditionType() AdditionType {
return AdditionOther
}
func (a *OtherAddition) IsNil() bool {
return a == nil || IsNilExpr(a.SqlExpr)
}