記錄一下PHP連接MySQL的兩種方式。
先mock一下數(shù)據(jù),可以執(zhí)行一下sql。
?1234567891011 /*創(chuàng)建數(shù)據(jù)庫*/ CREATE DATABASE IF NOT EXISTS `test`; /*選擇數(shù)據(jù)庫*/ USE `test`; /*創(chuàng)建表*/ CREATE TABLE IF NOT EXISTS `user` ( name varchar(50), age int); /*插入測試數(shù)據(jù)*/ INSERT INTO `user` (name, age) VALUES('harry', 20), ('tony', 23), ('harry', 24);
第一種是使用PHP原生的方式去連接數(shù)據(jù)庫。代碼如下:
?1234567891011121314151617181920212223242526272829 <?php $host = 'localhost'; $database = 'test'; $username = 'root'; $password = 'root'; $selectName = 'harry';//要查找的用戶名,一般是用戶輸入的信息 $connection = mysql_connect($host, $username, $password);//連接到數(shù)據(jù)庫 mysql_query("set names 'utf8'");//編碼轉(zhuǎn)化 if (!$connection) { die("could not connect to the database.\n" . mysql_error());//診斷連接錯誤 } $selectedDb = mysql_select_db($database);//選擇數(shù)據(jù)庫 if (!$selectedDb) { die("could not to the database\n" . mysql_error()); } $selectName = mysql_real_escape_string($selectName);//防止SQL注入 $query = "select * from user where name = '$selectName'";//構(gòu)建查詢語句 $result = mysql_query($query);//執(zhí)行查詢 if (!$result) { die("could not to the database\n" . mysql_error()); } while ($row = mysql_fetch_row($result)) { //取出結(jié)果并顯示 $name = $row[0]; $age = $row[1]; echo "Name: $name "; echo "Age: $age "; echo "\n"; }
其運行結(jié)構(gòu)如下:
Name: harry Age: 20
Name: tony Age: 23
第二種是使用PDO的方式去連接數(shù)據(jù)庫,代碼如下:
?1234567891011121314151617181920212223 <?php $host = 'localhost'; $database = 'test'; $username = 'root'; $password = 'root'; $selectName = 'harry';//要查找的用戶名,一般是用戶輸入的信息 $pdo = new PDO("mysql:host=$host;dbname=$database", $username, $password);//創(chuàng)建一個pdo對象 $pdo->exec("set names 'utf8'"); $sql = "select * from user where name = ?"; $stmt = $pdo->prepare($sql); $rs = $stmt->execute(array($selectName)); if ($rs) { // PDO::FETCH_ASSOC 關(guān)聯(lián)數(shù)組形式 // PDO::FETCH_NUM 數(shù)字索引數(shù)組形式 while ($row = $stmt->fetch(PDO::FETCH_ASSOC)) { $name = $row['name']; $age = $row['age']; echo "Name: $name "; echo "Age: $age "; echo "\n"; } } $pdo = null;//關(guān)閉連接
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