vql/builder/cond_between.go

// 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
}