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"
// Between implmentes between condition
type Between struct {
Col string
LessVal interface{}
MoreVal interface{}
}
var _ Cond = Between{}
// WriteTo write data to Writer
func (between Between) WriteTo(w Writer) error {
if _, err := fmt.Fprintf(w, "%s BETWEEN ", between.Col); err != nil {
return err
}
if lv, ok := between.LessVal.(expr); ok {
if err := lv.WriteTo(w); err != nil {
return err
}
} else {
if _, err := fmt.Fprint(w, "?"); err != nil {
return err
}
w.Append(between.LessVal)
}
if _, err := fmt.Fprint(w, " AND "); err != nil {
return err
}
if mv, ok := between.MoreVal.(expr); ok {
if err := mv.WriteTo(w); err != nil {
return err
}
} else {
if _, err := fmt.Fprint(w, "?"); err != nil {
return err
}
w.Append(between.MoreVal)
}
return nil
}
// And implments And with other conditions
func (between Between) And(conds ...Cond) Cond {
return And(between, And(conds...))
}
// Or implments Or with other conditions
func (between Between) Or(conds ...Cond) Cond {
return Or(between, Or(conds...))
}
// IsValid tests if the condition is valid
func (between Between) IsValid() bool {
return len(between.Col) > 0
}