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