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condition.go
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condition.go
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// Copyright 2017 The OpenPitrix Authors. All rights reserved.
// Use of this source code is governed by a Apache license
// that can be found in the LICENSE file.
package db
import (
"strings"
"github.com/gocraft/dbr"
)
const (
placeholder = "?"
)
// Copy From vendor/github.com/gocraft/dbr/condition.go:36
func buildCmp(d dbr.Dialect, buf dbr.Buffer, pred string, column string, value interface{}) error {
buf.WriteString(d.QuoteIdent(column))
buf.WriteString(" ")
buf.WriteString(pred)
buf.WriteString(" ")
buf.WriteString(placeholder)
buf.WriteValue(value)
return nil
}
// And creates AND from a list of conditions
func And(cond ...dbr.Builder) dbr.Builder {
return dbr.And(cond...)
}
// Or creates OR from a list of conditions
func Or(cond ...dbr.Builder) dbr.Builder {
return dbr.Or(cond...)
}
func escape(str string) string {
return strings.Map(func(r rune) rune {
switch r {
case '%', '\'', '^', '[', ']', '!', '_':
return ' '
}
return r
}, str)
}
func Like(column string, value string) dbr.Builder {
value = "%" + strings.TrimSpace(escape(value)) + "%"
return dbr.BuildFunc(func(d dbr.Dialect, buf dbr.Buffer) error {
return buildCmp(d, buf, "LIKE", column, value)
})
}
// Eq is `=`.
// When value is nil, it will be translated to `IS NULL`.
// When value is a slice, it will be translated to `IN`.
// Otherwise it will be translated to `=`.
func Eq(column string, value interface{}) dbr.Builder {
return dbr.Eq(column, value)
}
// Neq is `!=`.
// When value is nil, it will be translated to `IS NOT NULL`.
// When value is a slice, it will be translated to `NOT IN`.
// Otherwise it will be translated to `!=`.
func Neq(column string, value interface{}) dbr.Builder {
return dbr.Neq(column, value)
}
// Gt is `>`.
func Gt(column string, value interface{}) dbr.Builder {
return dbr.Gt(column, value)
}
// Gte is '>='.
func Gte(column string, value interface{}) dbr.Builder {
return dbr.Gte(column, value)
}
// Lt is '<'.
func Lt(column string, value interface{}) dbr.Builder {
return dbr.Lt(column, value)
}
// Lte is `<=`.
func Lte(column string, value interface{}) dbr.Builder {
return dbr.Lte(column, value)
}