面试官:你对MySQL比较熟?那说说PHP连接MySQL数据库的几种办法吧!
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">1.最简单的方式-mysql(面向过程)</p>
<div style="color: black; text-align: left; margin-bottom: 10px;"><?php
$con = mysql_connect("localhost","root","password");
$select_db = mysql_select_db(test);
if (!$select_db) {
die("could not connect to the db:\n" . mysql_error());
}
//<span style="color: black;">查找</span>代码
$sql = "select * from db_table";
$res = mysql_query($sql);
if (!$res) {
die("could get the res:\n" . mysql_error());
}
while ($row = mysql_fetch_assoc($res)) {
print_r($row);
}
//<span style="color: black;">查找</span>代码
//关闭数据库连接
mysql_close($con);
?></div>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><a style="color: black;">点击进入我的企鹅裙</a></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">2.新的方式-mysqli(面向过程)</p>
<div style="color: black; text-align: left; margin-bottom: 10px;">$mysql_server_name = localhost; //改成自己的mysql数据库服务器
$mysql_username = root; //改成自己的mysql数据库用户名
$mysql_password = password; //改成自己的mysql数据库<span style="color: black;">暗码</span>
$mysql_database = test; //改成自己的mysql数据库名
$conn=mysqli_connect($mysql_server_name,$mysql_username,$mysql_password,$mysql_database); //连接数据库
//连接数据库错误提示
if (mysqli_connect_errno($conn)) {
die("连接 MySQL 失败: " . mysqli_connect_error());
}
mysqli_query($conn,"set names utf8"); //数据库编码格式
// mysqli_set_charset($conn,"utf8");//设置默认客户端字符集。
// mysqli_select_db($conn,$mysql_database); //更改连接的默认数据库
//<span style="color: black;">查找</span>代码
$sql = “select * from db_table”;
$query = mysqli_query($conn,$sql);
while($row = mysqli_fetch_array($query)){
echo $row;
}
//<span style="color: black;">查找</span>代码
// 释放结果集+关闭MySQL数据库连接
mysqli_free_result($result);
mysqli_close($conn);</div>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">3、常用方式-mysqli(面向对象)</p>
<div style="color: black; text-align: left; margin-bottom: 10px;">//连接数据库方式1
$conn = new mysqli(localhost, root, password, test);
//连接数据库方式2
// $conn = new mysqli();
// $conn -> connect(localhost, root, password, test);
//check connection (<span style="color: black;">检测</span>PHP<span style="color: black;">是不是</span>连接上MYSQL)
if ($conn -> connect_errno) {
printf("Connect failed: %s\n", $conn->connect_error);
exit();
}
//<span style="color: black;">查找</span>代码
$sql = “select * from db_table”;
$query = $conn->query($sql);
while($row = $query</div>
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