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union.go
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/
union.go
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package dbr
type union struct {
builder []Builder
all bool
}
// Union builds `... UNION ...`.
func Union(builder ...Builder) interface {
Builder
As(string) Builder
} {
return &union{
builder: builder,
}
}
// UnionAll builds `... UNION ALL ...`.
func UnionAll(builder ...Builder) interface {
Builder
As(string) Builder
} {
return &union{
builder: builder,
all: true,
}
}
func (u *union) Build(d Dialect, buf Buffer) error {
for i, b := range u.builder {
if i > 0 {
buf.WriteString(" UNION ")
if u.all {
buf.WriteString("ALL ")
}
}
err := b.Build(d, buf)
if err != nil {
return err
}
}
return nil
}
func (u *union) As(alias string) Builder {
return as(u, alias)
}