Lightweight and fast SQL builder for Go language
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// Copyright 2016 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 (
"fmt"
)
// UpdateCond defines an interface that cond could be used with update
type UpdateCond interface {
IsValid() bool
OpWriteTo(op string, w Writer) error
}
// Update creates an update Builder
func Update(updates ...Cond) *Builder {
builder := &Builder{cond: NewCond()}
return builder.Update(updates...)
}
func (b *Builder) updateWriteTo(w Writer) error {
if len(b.from) <= 0 {
return ErrNoTableName
}
if len(b.updates) <= 0 {
return ErrNoColumnToUpdate
}
if _, err := fmt.Fprintf(w, "UPDATE %s SET ", b.from); err != nil {
return err
}
for i, s := range b.updates {
if err := s.OpWriteTo(",", w); err != nil {
return err
}
if i != len(b.updates)-1 {
if _, err := fmt.Fprint(w, ","); err != nil {
return err
}
}
}
if !b.cond.IsValid() {
return nil
}
if _, err := fmt.Fprint(w, " WHERE "); err != nil {
return err
}
return b.cond.WriteTo(w)
}