/*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);

<?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)) {
  //取出結果并顯示
  $name = $row[0];
  $age = $row[1];
  echo "Name: $name ";
  echo "Age: $age ";
  echo "\n";
}

<?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;//關閉連接