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thinkphp/library/think/db/Where.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;
+
+use ArrayAccess;
+
+class Where implements ArrayAccess
+{
+    /**
+     * 查询表达式
+     * @var array
+     */
+    protected $where = [];
+
+    /**
+     * 是否需要增加括号
+     * @var bool
+     */
+    protected $enclose = false;
+
+    /**
+     * 创建一个查询表达式
+     *
+     * @param  array    $where      查询条件数组
+     * @param  bool     $enclose    是否增加括号
+     */
+    public function __construct(array $where = [], $enclose = false)
+    {
+        $this->where   = $where;
+        $this->enclose = $enclose;
+    }
+
+    /**
+     * 设置是否添加括号
+     * @access public
+     * @param  bool $enclose
+     * @return $this
+     */
+    public function enclose($enclose = true)
+    {
+        $this->enclose = $enclose;
+        return $this;
+    }
+
+    /**
+     * 解析为Query对象可识别的查询条件数组
+     * @access public
+     * @return array
+     */
+    public function parse()
+    {
+        $where = [];
+
+        foreach ($this->where as $key => $val) {
+            if ($val instanceof Expression) {
+                $where[] = [$key, 'exp', $val];
+            } elseif (is_null($val)) {
+                $where[] = [$key, 'NULL', ''];
+            } elseif (is_array($val)) {
+                $where[] = $this->parseItem($key, $val);
+            } else {
+                $where[] = [$key, '=', $val];
+            }
+        }
+
+        return $this->enclose ? [$where] : $where;
+    }
+
+    /**
+     * 分析查询表达式
+     * @access protected
+     * @param  string   $field     查询字段
+     * @param  array    $where     查询条件
+     * @return array
+     */
+    protected function parseItem($field, $where = [])
+    {
+        $op        = $where[0];
+        $condition = isset($where[1]) ? $where[1] : null;
+
+        if (is_array($op)) {
+            // 同一字段多条件查询
+            array_unshift($where, $field);
+        } elseif (is_null($condition)) {
+            if (in_array(strtoupper($op), ['NULL', 'NOTNULL', 'NOT NULL'], true)) {
+                // null查询
+                $where = [$field, $op, ''];
+            } elseif (in_array($op, ['=', 'eq', 'EQ', null], true)) {
+                $where = [$field, 'NULL', ''];
+            } elseif (in_array($op, ['<>', 'neq', 'NEQ'], true)) {
+                $where = [$field, 'NOTNULL', ''];
+            } else {
+                // 字段相等查询
+                $where = [$field, '=', $op];
+            }
+        } else {
+            $where = [$field, $op, $condition];
+        }
+
+        return $where;
+    }
+
+    /**
+     * 修改器 设置数据对象的值
+     * @access public
+     * @param  string $name  名称
+     * @param  mixed  $value 值
+     * @return void
+     */
+    public function __set($name, $value)
+    {
+        $this->where[$name] = $value;
+    }
+
+    /**
+     * 获取器 获取数据对象的值
+     * @access public
+     * @param  string $name 名称
+     * @return mixed
+     */
+    public function __get($name)
+    {
+        return isset($this->where[$name]) ? $this->where[$name] : null;
+    }
+
+    /**
+     * 检测数据对象的值
+     * @access public
+     * @param  string $name 名称
+     * @return boolean
+     */
+    public function __isset($name)
+    {
+        return isset($this->where[$name]);
+    }
+
+    /**
+     * 销毁数据对象的值
+     * @access public
+     * @param  string $name 名称
+     * @return void
+     */
+    public function __unset($name)
+    {
+        unset($this->where[$name]);
+    }
+
+    // ArrayAccess
+    public function offsetSet($name, $value)
+    {
+        $this->__set($name, $value);
+    }
+
+    public function offsetExists($name)
+    {
+        return $this->__isset($name);
+    }
+
+    public function offsetUnset($name)
+    {
+        $this->__unset($name);
+    }
+
+    public function offsetGet($name)
+    {
+        return $this->__get($name);
+    }
+
+}