<?php
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// +----------------------------------------------------------------------
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// | ThinkPHP [ WE CAN DO IT JUST THINK ]
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// +----------------------------------------------------------------------
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// | Copyright (c) 2006~2023 http://thinkphp.cn All rights reserved.
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// +----------------------------------------------------------------------
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// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )
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// +----------------------------------------------------------------------
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// | Author: liu21st <liu21st@gmail.com>
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// +----------------------------------------------------------------------
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declare(strict_types=1);
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namespace think\db\builder;
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use think\db\Builder;
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use think\db\BaseQuery as Query;
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use think\db\Raw;
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/**
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* Sqlite数据库驱动.
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*/
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class Sqlite extends Builder
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{
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/**
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* limit.
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*
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* @param Query $query 查询对象
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* @param mixed $limit
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*
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* @return string
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*/
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public function parseLimit(Query $query, string $limit): string
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{
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$limitStr = '';
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if (!empty($limit)) {
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$limit = explode(',', $limit);
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if (count($limit) > 1) {
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$limitStr .= ' LIMIT ' . $limit[1] . ' OFFSET ' . $limit[0] . ' ';
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} else {
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$limitStr .= ' LIMIT ' . $limit[0] . ' ';
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}
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}
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return $limitStr;
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}
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/**
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* 随机排序.
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*
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* @param Query $query 查询对象
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*
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* @return string
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*/
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protected function parseRand(Query $query): string
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{
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return 'RANDOM()';
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}
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/**
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* 字段和表名处理.
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*
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* @param Query $query 查询对象
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* @param string|int|Raw $key 字段名
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* @param bool $strict 严格检测
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*
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* @return string
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*/
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public function parseKey(Query $query, string|int|Raw $key, bool $strict = false): string
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{
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if (is_int($key)) {
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return (string) $key;
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} elseif ($key instanceof Raw) {
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return $this->parseRaw($query, $key);
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}
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$key = trim($key);
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if (str_contains($key, '.') && !preg_match('/[,\'\"\(\)`\s]/', $key)) {
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[$table, $key] = explode('.', $key, 2);
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$alias = $query->getOptions('alias');
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if ('__TABLE__' == $table) {
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$table = $query->getOptions('table');
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$table = is_array($table) ? array_shift($table) : $table;
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}
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if (isset($alias[$table])) {
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$table = $alias[$table];
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}
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}
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if ('*' != $key && !preg_match('/[,\'\"\*\(\)`.\s]/', $key)) {
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$key = '`' . $key . '`';
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}
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if (isset($table)) {
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$key = '`' . $table . '`.' . $key;
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}
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return $key;
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}
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/**
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* 设置锁机制.
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*
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* @param Query $query 查询对象
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* @param bool|string $lock
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*
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* @return string
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*/
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protected function parseLock(Query $query, bool|string $lock = false): string
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{
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return '';
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}
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}
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