1.最簡單的方式-mysql(面向過程)

$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());

}

//查詢代碼

$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);

}

//查詢代碼

//關(guān)閉數(shù)據(jù)庫連接

mysql_close($con);

?>

2.新的方式-mysqli(面向過程)

$mysql_server_name = 'localhost'; //改成自己的mysql數(shù)據(jù)庫服務(wù)器

$mysql_username = 'root'; //改成自己的mysql數(shù)據(jù)庫用戶名

$mysql_password = 'password'; //改成自己的mysql數(shù)據(jù)庫密碼

$mysql_database = 'test'; //改成自己的mysql數(shù)據(jù)庫名

$conn=mysqli_connect($mysql_server_name,$mysql_username,$mysql_password,$mysql_database); //連接數(shù)據(jù)庫

//連接數(shù)據(jù)庫錯誤提示

if (mysqli_connect_errno($conn)) {

die("連接 MySQL 失敗: " . mysqli_connect_error());

}

mysqli_query($conn,"set names utf8"); //數(shù)據(jù)庫編碼格式

// mysqli_set_charset($conn,"utf8");//設(shè)置默認(rèn)客戶端字符集。

// mysqli_select_db($conn,$mysql_database); //更改連接的默認(rèn)數(shù)據(jù)庫

//查詢代碼

$sql = “select * from db_table”;

$query = mysqli_query($conn,$sql);

while($row = mysqli_fetch_array($query)){

echo $row['title'];

}

//查詢代碼

// 釋放結(jié)果集+關(guān)閉MySQL數(shù)據(jù)庫連接

mysqli_free_result($result);

mysqli_close($conn);

3、常用方式-mysqli(面向?qū)ο?

//連接數(shù)據(jù)庫方式1

$conn = new mysqli('localhost', 'root', 'password', 'test');

//連接數(shù)據(jù)庫方式2

// $conn = new mysqli();

// $conn -> connect('localhost', 'root', 'password', 'test');

//check connection (檢查PHP是否連接上MYSQL)

if ($conn -> connect_errno) {

printf("Connect failed: %s\n", $conn->connect_error);

exit();

}

//查詢代碼

$sql = “select * from db_table”;

$query = $conn->query($sql);

while($row = $query->fetch_array()){

echo $row['title'];

}

//查詢代碼

//釋放結(jié)果集+關(guān)閉MySQL連接

$query1 -> free_result();

$conn -> close();

4、PDO連接MySQL數(shù)據(jù)庫

$db = new PDO('mysql:host=localhost;dbname=test', 'root', 'password');

try {

foreach ($db->query('select * from db_table') as $row){

print_r($row);

}

$db = null; //關(guān)閉數(shù)據(jù)庫

} catch (PDOException $e) {

echo $e->getMessage();

}

?>

5、ADODB連接MySQL數(shù)據(jù)庫

//安裝驅(qū)動-引入類即可

require_once './adodb5/adodb.inc.php';

$conn = &ADONewConnection('mysql');

$conn->connect('localhost','root','password','test');

$conn->Execute("set names utf8");

//查詢代碼

$res = $conn->Execute("select * from db_table");

if (!$res){

echo $conn->ErrorMsg();

}else{

var_dump($res);

}

?>

//關(guān)閉連接

$conn->close();

6、總結(jié)-關(guān)閉mysql數(shù)據(jù)庫的連接方法

MySQL - 面向過程

mysql_close($conn);

MySQLi - 面向過程

mysqli_close($conn);

MySQLi - 面向?qū)ο?/p>

$conn->close();

PDO

$conn = null;

ADODB

$conn->close();

或

$conn->free();

總結(jié)

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