先在php.ini文件里开放;extension=php_mysql.dll,去掉";"
然后配置扩展目 extension_dir = "F://php5.3/ext"。
1.创建数据库建表
/*创建数据库*/ CREATE DATABASE IF NOT EXISTS `test`; /*选择数据库*/ USE `test`; /*创建表*/ CREATE TABLE IF NOT EXISTS `user` ( name varchar(50), age int ); /*插入测试数据*/ INSERT INTO `user` (name, age) VALUES('harry', 20), ('tony', 23), ('harry', 24);
2.原生的SQL连接
<?php $host = 'localhost'; $database = 'test'; $username = 'root'; $password = 'root'; $selectName = 'harry';//要查找的用户名,一般是用户输入的信息 $connection = mysql_connect($host, $username, $password);//连接到数据库 mysql_query("set names 'utf8'");//编码转化 if (!$connection) { die("could not connect to the database. " . mysql_error());//诊断连接错误 } $selectedDb = mysql_select_db($database);//选择数据库 if (!$selectedDb) { die("could not to the database " . mysql_error()); } $selectName = mysql_real_escape_string($selectName);//防止SQL注入 $query = "select * from user where name = '$selectName'";//构建查询语句 $result = mysql_query($query);//执行查询 if (!$result) { die("could not to the database " . mysql_error()); } while ($row = mysql_fetch_row($result)) { //取出结果并显示 $name = $row[0]; $age = $row[1]; echo "Name: $name "; echo "Age: $age "; echo " "; }
?>
运行结果
其运行结构如下:
Name: harry Age: 20
Name: tony Age: 23
3.第二种是使用PDO的方式去连接数据库,代码如下:
<?php $host = 'localhost'; $database = 'test'; $username = 'root'; $password = 'root'; $selectName = 'harry';//要查找的用户名,一般是用户输入的信息 $pdo = new PDO("mysql:host=$host;dbname=$database", $username, $password);//创建一个pdo对象 $pdo->exec("set names 'utf8'"); $sql = "select * from user where name = ?"; $stmt = $pdo->prepare($sql); $rs = $stmt->execute(array($selectName)); if ($rs) { // PDO::FETCH_ASSOC 关联数组形式 // PDO::FETCH_NUM 数字索引数组形式 while ($row = $stmt->fetch(PDO::FETCH_ASSOC)) { $name = $row['name']; $age = $row['age']; echo "Name: $name "; echo "Age: $age "; echo " "; } } $pdo = null;//关闭连接