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Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
48 lines
982 B
48 lines
982 B
// Copyright 2018 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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"fmt"
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"strings"
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)
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func (b *Builder) unionWriteTo(w Writer) error {
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if b.limitation != nil || b.cond.IsValid() ||
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b.orderBy != "" || b.having != "" || b.groupBy != "" {
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return ErrNotUnexpectedUnionConditions
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}
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for idx, u := range b.unions {
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current := u.builder
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if current.optype != selectType {
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return ErrUnsupportedUnionMembers
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}
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if len(b.unions) == 1 {
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if err := current.selectWriteTo(w); err != nil {
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return err
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}
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} else {
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if b.dialect != "" && b.dialect != current.dialect {
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return ErrInconsistentDialect
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}
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if idx != 0 {
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fmt.Fprint(w, fmt.Sprintf(" UNION %v ", strings.ToUpper(u.unionType)))
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}
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fmt.Fprint(w, "(")
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if err := current.selectWriteTo(w); err != nil {
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return err
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}
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fmt.Fprint(w, ")")
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}
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}
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return nil
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}
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