50 lines
1013 B
Go
50 lines
1013 B
Go
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// 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 condExists struct {
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subQuery *Builder
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}
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var _ Cond = condExists{}
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// Exists returns Cond via condition
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func Exists(subQuery *Builder) Cond {
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return &condExists{
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subQuery: subQuery,
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}
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}
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func (condExists condExists) WriteTo(w Writer) error {
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if !condExists.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, "EXISTS ("); err != nil {
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return err
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}
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if err := condExists.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 (condExists condExists) And(conds ...Cond) Cond {
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return And(condExists, And(conds...))
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}
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func (condExists condExists) Or(conds ...Cond) Cond {
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return Or(condExists, Or(conds...))
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}
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func (condExists condExists) IsValid() bool {
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return condExists.subQuery != nil
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}
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