forked from xorm/builder
50 lines
1013 B
Go
50 lines
1013 B
Go
// Copyright 2022 The Xorm Authors. All rights reserved.
|
|
// Use of this source code is governed by a BSD-style
|
|
// license that can be found in the LICENSE file.
|
|
|
|
package builder
|
|
|
|
import (
|
|
"errors"
|
|
"io"
|
|
)
|
|
|
|
type condExists struct {
|
|
subQuery *Builder
|
|
}
|
|
|
|
var _ Cond = condExists{}
|
|
|
|
// Exists returns Cond via condition
|
|
func Exists(subQuery *Builder) Cond {
|
|
return &condExists{
|
|
subQuery: subQuery,
|
|
}
|
|
}
|
|
|
|
func (condExists condExists) WriteTo(w Writer) error {
|
|
if !condExists.IsValid() {
|
|
return errors.New("exists condition is nov valid")
|
|
}
|
|
if _, err := io.WriteString(w, "EXISTS ("); err != nil {
|
|
return err
|
|
}
|
|
if err := condExists.subQuery.WriteTo(w); err != nil {
|
|
return err
|
|
}
|
|
_, err := io.WriteString(w, ")")
|
|
return err
|
|
}
|
|
|
|
func (condExists condExists) And(conds ...Cond) Cond {
|
|
return And(condExists, And(conds...))
|
|
}
|
|
|
|
func (condExists condExists) Or(conds ...Cond) Cond {
|
|
return Or(condExists, Or(conds...))
|
|
}
|
|
|
|
func (condExists condExists) IsValid() bool {
|
|
return condExists.subQuery != nil
|
|
}
|