# 第四課數據庫操作
### 常用表說明
```
<pre class="calibre14">```
ims_mc_mapping_fans 粉絲表
ims_mc_members 會員表
```
```
### 數據庫操作函數
```
<pre class="calibre16">```
表名
<span class="token1">tablename</span><span class="token2">(</span><span class="token4">'mc_members'</span><span class="token2">)</span>
查詢一條數據
<span class="token1">pdo_get</span><span class="token2">(</span><span class="token4">'yoby_demo'</span><span class="token2">,</span><span class="token2">[</span><span class="token4">'id'</span><span class="token">=</span><span class="token">></span><span class="token3">1</span><span class="token2">]</span><span class="token2">)</span><span class="token2">;</span>
<span class="token1">pdo_get</span><span class="token2">(</span><span class="token4">'yoby_demo'</span><span class="token2">,</span><span class="token2">[</span><span class="token4">'id'</span><span class="token">=</span><span class="token">></span><span class="token3">1</span><span class="token2">]</span><span class="token2">,</span><span class="token2">[</span><span class="token4">'title'</span><span class="token2">,</span><span class="token4">'num'</span><span class="token2">]</span><span class="token2">)</span><span class="token2">;</span>返回特定字段
<span class="token1">pdo_get</span><span class="token2">(</span><span class="token4">'yoby_demo'</span><span class="token2">,</span><span class="token2">[</span><span class="token2">]</span><span class="token2">,</span><span class="token2">[</span><span class="token4">'count(*) as z'</span><span class="token2">,</span><span class="token4">'title'</span><span class="token2">,</span><span class="token4">'num'</span><span class="token2">,</span><span class="token4">'max(num)'</span><span class="token2">]</span><span class="token2">)</span><span class="token2">;</span>
<span class="token1">pdo_fetch</span><span class="token2">(</span><span class="token4">"SELECT username, uid FROM "</span><span class="token2">.</span><span class="token1">tablename</span><span class="token2">(</span><span class="token4">'users'</span><span class="token2">)</span><span class="token2">.</span><span class="token4">" WHERE uid = :uid LIMIT 1"</span><span class="token2">,</span> <span class="token1">array</span><span class="token2">(</span><span class="token4">':uid'</span> <span class="token">=</span><span class="token">></span> <span class="token3">1</span><span class="token2">)</span><span class="token2">)</span><span class="token2">;</span>
查詢單字段
<span class="token1">pdo_getcolumn</span><span class="token2">(</span><span class="token4">'yoby_demo'</span><span class="token2">,</span><span class="token2">[</span><span class="token4">'id'</span><span class="token">=</span><span class="token">></span><span class="token3">1</span><span class="token2">]</span><span class="token2">,</span><span class="token4">'title'</span><span class="token2">)</span><span class="token2">;</span>
<span class="token1">pdo_fetchcolumn</span><span class="token2">(</span><span class="token4">"SELECT COUNT(*) FROM "</span><span class="token2">.</span><span class="token1">tablename</span><span class="token2">(</span><span class="token4">'users'</span><span class="token2">)</span><span class="token2">)</span><span class="token2">;</span>
查詢多條記錄
表名<span class="token2">,</span>條件<span class="token2">,</span>返回字段<span class="token2">,</span>主鍵<span class="token2">,</span>排序<span class="token2">,</span>限制條數
<span class="token1">pdo_getall</span><span class="token2">(</span><span class="token4">'yoby_demo'</span><span class="token2">,</span><span class="token2">[</span><span class="token2">]</span><span class="token2">,</span><span class="token2">[</span><span class="token2">]</span><span class="token2">,</span><span class="token4">''</span><span class="token2">,</span><span class="token4">'id desc'</span><span class="token2">,</span><span class="token4">'.($pindex-1)* $psize.'</span><span class="token2">,</span>'<span class="token2">.</span>$psize<span class="token2">)</span><span class="token2">;</span>
<span class="token1">pdo_fetchall</span><span class="token2">(</span><span class="token4">"SELECT username, uid FROM "</span><span class="token2">.</span><span class="token1">tablename</span><span class="token2">(</span><span class="token4">'users'</span><span class="token2">)</span><span class="token2">,</span> <span class="token2">[</span><span class="token2">]</span><span class="token2">)</span><span class="token2">;</span>
插入數據<span class="token2">,</span>第二個參數數組
<span class="token1">pdo_insert</span><span class="token2">(</span><span class="token4">'yoby_demo'</span><span class="token2">,</span><span class="token2">[</span><span class="token2">]</span><span class="token2">)</span><span class="token2">;</span>
$id <span class="token">=</span> <span class="token1">pdo_insertid</span><span class="token2">(</span><span class="token2">)</span><span class="token2">;</span>插入id
修改
<span class="token1">pdo_update</span><span class="token2">(</span><span class="token4">'yoby_demo'</span><span class="token2">,</span><span class="token2">[</span><span class="token4">'num +='</span><span class="token">=</span><span class="token">></span><span class="token3">1</span><span class="token2">]</span><span class="token2">,</span><span class="token2">[</span><span class="token4">'id'</span><span class="token">=</span><span class="token">></span><span class="token3">1</span><span class="token2">]</span><span class="token2">)</span><span class="token2">;</span>
刪除
<span class="token1">pdo_delete</span><span class="token2">(</span><span class="token4">'yoby_demo'</span><span class="token2">,</span><span class="token2">[</span><span class="token4">'id'</span><span class="token">=</span><span class="token">></span><span class="token3">1</span><span class="token2">]</span><span class="token2">)</span><span class="token2">;</span>
<span class="token1">pdo_delete</span><span class="token2">(</span>$this<span class="token">-</span><span class="token">></span>table_reply<span class="token2">,</span> <span class="token4">"id IN ('"</span><span class="token2">.</span><span class="token1">implode</span><span class="token2">(</span><span class="token4">"','"</span><span class="token2">,</span> $deleteid<span class="token2">)</span><span class="token2">.</span><span class="token4">"')"</span><span class="token2">)</span><span class="token2">;</span>
執行sql
<span class="token1">pdo_query</span><span class="token2">(</span><span class="token4">"DELETE FROM "</span><span class="token2">.</span><span class="token1">tablename</span><span class="token2">(</span><span class="token4">'users'</span><span class="token2">)</span><span class="token2">.</span><span class="token4">" WHERE uid = :uid"</span><span class="token2">,</span> <span class="token1">array</span><span class="token2">(</span><span class="token4">':uid'</span> <span class="token">=</span><span class="token">></span> <span class="token3">2</span><span class="token2">)</span><span class="token2">)</span><span class="token2">;</span>
支持多條sql用分號隔開
<span class="token1">pdo_run</span><span class="token2">(</span>$sql<span class="token2">)</span><span class="token2">;</span>
顯示調試語句
<span class="token1">pdo_debug</span><span class="token2">(</span><span class="token2">)</span><span class="token2">;</span>
檢測某個字段是否存在
<span class="token1">pdo_fieldexists</span><span class="token2">(</span><span class="token4">'shopping_goods'</span><span class="token2">,</span> <span class="token4">'credit'</span><span class="token2">)</span><span class="token2">;</span>
檢測某個表是否存在
<span class="token1">pdo_tableexists</span><span class="token2">(</span>$tablename<span class="token2">)</span>
檢測表是否為空
<span class="token1">pdo_exists</span><span class="token2">(</span>$tb<span class="token2">)</span>
獲取數據條數
<span class="token1">pdo_count</span><span class="token2">(</span>$tb<span class="token2">,</span><span class="token2">[</span><span class="token4">'id'</span><span class="token">=</span><span class="token">></span><span class="token3">1</span><span class="token2">]</span><span class="token2">)</span>
```
```
- 簡介
- 第一章 數據庫
- Mysql/mariadb
- 函數
- 基礎
- 增刪改索引
- 標準查詢
- 高級查詢
- TIDB集群mysql解決方案
- Redis
- 語言基礎
- 5種數據類型
- 其他類型
- Sqlite
- 語言基礎
- 常用查詢
- 第二章 PHP
- 語言基礎
- 第一課 流程控制和運算
- 第二課 數組
- 第三課 日期時間
- 第四課 常用函數
- 第五課 字符串
- 第六課 文件操作
- 第七課 面向對象
- 第八課 正則表達式
- 第九課 圖片處理生成
- 第十課 curl/memche
- 第十一課 mysql和pdo
- 第十三課 cookie和session
- 第十四課 xml操作
- 第十五課 php5.3+新特性
- 第十六課 php7+
- 第十七課 密碼安全
- 廢棄函數
- php命令行
- redis應用
- 算法
- 排序算法
- 基礎算法
- 無限級分類
- 自定義函數Fn
- 查找算法
- 自定義函數數據函數fn
- laravel
- 路由
- 常用語句
- 數據庫
- dingo/api
- Yii2
- 控制器
- 常用類
- 數據庫
- redis
- thinkphp6
- TP6文檔
- TP6插件
- dedecms
- 織夢標簽大全
- 數據庫操作
- 內置函數和定義函數
- 織夢核心改動
- 織夢插件/底層標簽開發
- PHP相關工具
- composer
- php開發環境phpenv
- Phpstorm使用
- windows編譯php擴展
- PHP開源庫
- 開源項目管理禪道
- sns_auth
- php-casbin權限控制
- php-jwt
- 微信SDKeasywechat
- querylist采集庫
- workerman
- Box/Spout處理excel和csv
- dll擴展
- redis/memche/xdebug
- redis
- Lua
- php_xlswriter
- event
- swoole
- 常用代碼庫
- 微擎框架
- 第一課全局變量
- 第二課常用函數
- 第三課自定義微擎獨有函數
- 第四課數據庫操作
- 第五課微信端回復
- 第六課微擎高級操作
- 第八課global函數列表
- mainfest.xml詳解
- js方法
- 人人商城
- 第一課model解讀
- 第二課常用語句解讀
- 第三課常用js解讀
- 第四課附錄常見問題
- 第五課附錄處理報表|支付
- 常用JSON狀態碼
- 第三章 JavaScript
- js基礎
- 瀏覽器對象
- 語言基礎
- html5接口
- ES6新語法
- vue
- 基礎語法
- 京東vueUI組件
- uniapp
- 組件開發規范
- nodejs
- 基礎知識
- 安裝node
- nvm不同版本node切換
- js常用標準庫
- zepto/jquery
- weui
- js圖標庫
- elementUI
- validator表單驗證
- layer彈出層
- requirejs
- wow動畫
- 動畫animate
- swiper4
- 百度編輯器
- flyio/axios/qs
- jquery.form
- bootstrap3
- clipboard復制
- slideout側滑
- imagehover.css圖片懸停動畫
- webpack打包
- Bulma UI框架
- store 客戶端存儲
- lottie動畫創建庫
- sweetalert
- js自定義函數
- 常見JSSDK
- 微信公眾號JSSDK
- 騰訊地圖jssdk
- 微信小程序
- 第四章 編程語言
- markdown語言
- Dart語言
- Dart語言基礎
- Flutter框架
- Lua語言
- 字符串,數組,表
- 自定義方法
- go語言
- 第1.1語言基本語法
- 第1.2流程控制
- 第1.3函數
- 第1.4結構體
- 第1.5接口
- 第1.6包
- go語言框架Gin
- CSS3語言
- CSS與CSS3
- 選擇符
- 屬性
- css3
- loading動畫
- HTML5語言
- less
- sass
- C#
- 基礎知識
- 函數
- 第五章 開發工具
- git
- nginx/apache服務器
- Linux常用操作
- crontab定時任務
- 注冊表與cmd
- 阿里云ECS
- frp穿透和ssl續期
- 寶塔安裝
- 樹莓派
- 瀏覽器模擬
- 火狐/chrome常用插件
- WSL安裝使用
- mac brew和終端命令
- win10相關