forked from xorm/builder
50 lines
1.0 KiB
Go
50 lines
1.0 KiB
Go
// Copyright 2022 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 builder
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import (
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"errors"
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"io"
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)
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type condNotExists struct {
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subQuery *Builder
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}
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var _ Cond = condNotExists{}
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// NotExists returns Cond via condition
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func NotExists(subQuery *Builder) Cond {
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return &condNotExists{
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subQuery: subQuery,
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}
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}
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func (condNotExists condNotExists) WriteTo(w Writer) error {
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if !condNotExists.IsValid() {
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return errors.New("exists condition is nov valid")
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}
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if _, err := io.WriteString(w, "NOT EXISTS ("); err != nil {
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return err
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}
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if err := condNotExists.subQuery.WriteTo(w); err != nil {
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return err
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}
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_, err := io.WriteString(w, ")")
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return err
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}
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func (condNotExists condNotExists) And(conds ...Cond) Cond {
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return And(condNotExists, And(conds...))
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}
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func (condNotExists condNotExists) Or(conds ...Cond) Cond {
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return Or(condNotExists, Or(conds...))
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}
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func (condNotExists condNotExists) IsValid() bool {
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return condNotExists.subQuery != nil
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}
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