From 9804e97b60b4f4ba286eddc5ebe1fed8f41ac360 Mon Sep 17 00:00:00 2001
From: LIERLIER <1113093541@qq.com>
Date: Mon, 21 Aug 2023 13:58:30 +0800
Subject: [PATCH] migration

---
 readme.md | 87 -------------------------------------------------------
 1 file changed, 87 deletions(-)

diff --git a/readme.md b/readme.md
index 6693f9f..1f996bc 100644
--- a/readme.md
+++ b/readme.md
@@ -296,98 +296,11 @@ $myModels = MyModel::find()
 
 #### Migration
 
-##### 从最高位添加标志位，默认值为 `1`  (默认值为 `0` 无操作)
-
-添加公式： `value + (1 << n)`
-删除公式： `value - (1 << n)`
-
-migration:
-```php
-<?php
-
-use yii\db\Migration;
-
-/**
- * Class mxxxxxx_xxxxxx_update_{table}_table_{column}_column
- */
-class mxxxxxx_xxxxxx_update_{table}_table_{column}_column extends Migration
-{
-    /**
-     * {@inheritdoc}
-     */
-    public function safeUp()
-    {
-        $this->update('{table}', ['{column}' => new \yii\db\Expression('{column} + (1 << {n})')]);
-    }
-
-    /**
-     * {@inheritdoc}
-     */
-    public function safeDown()
-    {
-        $this->update('{table}', ['{column}' => new \yii\db\Expression('{column} - (1 << {n})')]);
-    }
-}
-```
-
 ##### 标志位插入到第 `n` 位，默认值为 `k`
 
 插入公式： `(value >> n << (n + 1)) + (value & ((1 << n) - 1)) + (k << n)`
 删除公式： `(value >> (n + 1) << n) + (value & ((1 << n) - 1))`
 
-migration:
-```php
-<?php
-
-use yii\db\Migration;
-
-/**
- * Class mxxxxxx_xxxxxx_update_{table}_table_{column}_column
- */
-class mxxxxxx_xxxxxx_update_{table}_table_{column}_column extends Migration
-{
-    /**
-     * {@inheritdoc}
-     */
-    public function safeUp()
-    {
-        $this->update('{table}', ['{column}' => new \yii\db\Expression('({column} >> {n} << ({n} + 1)) + ({column} & ((1 << {n}) - 1)) + ({k} << {n})')]);
-    }
-
-    /**
-     * {@inheritdoc}
-     */
-    public function safeDown()
-    {
-        $this->update('{table}', ['{column}' => new \yii\db\Expression('({column} >> ({n} + 1) << {n}) + ({column} & ((1 << {n}) - 1))')]);
-    }
-}
-```
-
-封装：
-
-```php
-/**
- * @param string $column
- * @param int $pos
- * @param string $operate
- * @param int $defaultValue
- * @return \yii\db\Expression
- */
-public function getBitFlagExpression($column, $pos, $operate, $defaultValue = 0)
-{
-    if ($operate == 'insert') {
-        $expresstion = "($column >> $pos << ($pos + 1)) + ($column & ((1 << $pos) - 1)) + ($defaultValue << $pos)";
-    } elseif ($operate == 'delete') {
-        $expresstion = "($column >> ($pos + 1) << $pos) + ($column & ((1 << $pos) - 1))";
-    } else {
-        throw new \InvalidArgumentException('$operate: '.$operate);
-    }
-
-    return new \yii\db\Expression($expresstion); 
-}
-```
-
 migration:
 
 ```php