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thinkphp/library/think/db/builder/Sqlite.php

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+<?php
+// +----------------------------------------------------------------------
+// | ThinkPHP [ WE CAN DO IT JUST THINK ]
+// +----------------------------------------------------------------------
+// | Copyright (c) 2006~2018 http://thinkphp.cn All rights reserved.
+// +----------------------------------------------------------------------
+// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )
+// +----------------------------------------------------------------------
+// | Author: liu21st <liu21st@gmail.com>
+// +----------------------------------------------------------------------
+
+namespace think\db\builder;
+
+use think\db\Builder;
+use think\db\Query;
+
+/**
+ * Sqlite数据库驱动
+ */
+class Sqlite extends Builder
+{
+
+    /**
+     * limit
+     * @access public
+     * @param  Query     $query        查询对象
+     * @param  mixed     $limit
+     * @return string
+     */
+    public function parseLimit(Query $query, $limit)
+    {
+        $limitStr = '';
+
+        if (!empty($limit)) {
+            $limit = explode(',', $limit);
+            if (count($limit) > 1) {
+                $limitStr .= ' LIMIT ' . $limit[1] . ' OFFSET ' . $limit[0] . ' ';
+            } else {
+                $limitStr .= ' LIMIT ' . $limit[0] . ' ';
+            }
+        }
+
+        return $limitStr;
+    }
+
+    /**
+     * 随机排序
+     * @access protected
+     * @param  Query     $query        查询对象
+     * @return string
+     */
+    protected function parseRand(Query $query)
+    {
+        return 'RANDOM()';
+    }
+
+    /**
+     * 字段和表名处理
+     * @access public
+     * @param  Query     $query     查询对象
+     * @param  mixed     $key       字段名
+     * @param  bool      $strict   严格检测
+     * @return string
+     */
+    public function parseKey(Query $query, $key, $strict = false)
+    {
+        if (is_numeric($key)) {
+            return $key;
+        } elseif ($key instanceof Expression) {
+            return $key->getValue();
+        }
+
+        $key = trim($key);
+
+        if (strpos($key, '.')) {
+            list($table, $key) = explode('.', $key, 2);
+
+            $alias = $query->getOptions('alias');
+
+            if ('__TABLE__' == $table) {
+                $table = $query->getOptions('table');
+                $table = is_array($table) ? array_shift($table) : $table;
+            }
+
+            if (isset($alias[$table])) {
+                $table = $alias[$table];
+            }
+        }
+
+        if (isset($table)) {
+            $key = $table . '.' . $key;
+        }
+
+        return $key;
+    }
+}