PHP代碼里怎么判斷數(shù)據(jù)庫(kù)是不是存在呢？

?php

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$con = mysql_connect("localhost", "hello", "321");

if (!$con)

{

die('Could not connect: ' . mysql_error());

}

$db_selected = mysql_select_db("test_db", $con);

if (!$db_selected)

{

die ("Can\'t use test_db : " . mysql_error());

}

mysql_close($con);

?

其實(shí)就是先登錄再選擇數(shù)據(jù)庫(kù)

mysql_select_db

php怎么判斷數(shù)據(jù)庫(kù)數(shù)據(jù)是否存在

?php

$data = array();

$db_name_php = 'books';

if (!mysql_connect('localhost', 'root', '123456')) {

echo '不能連接到mysql';

exit;

}

$result = mysql_query('show databases;');

While($row = mysql_fetch_assoc($result)){

$data[] = $row['Database'];

}

unset($result, $row);

mysql_close();

print_r($data);

echo 'brbr'; if (in_array(strtolower($db_name_php), $data))

echo '[',$db_name_php,']數(shù)據(jù)庫(kù)存在';

else

echo '[',$db_name_php,']數(shù)據(jù)庫(kù)不存在';

?

php判斷數(shù)據(jù)庫(kù)是不是連接成功的測(cè)試?yán)?/h2>

form action="" method="post"

select name="host"

option value="localhost" selectedlocalhost/option

option value="127.0.0.1"127.0.0.1/option

/select

brbr

user:input type="text" name="user" value=""brbr

pwd :input type="passWord" name="pwd" value=""brbr

input type="submit" value="connent"

input type="reset" value="reset"

/form

?php

error_reporting(~E_ALL);

$host = $_POST['host'];

$user = $_POST['user'];

$pwd = $_POST['pwd'];

if(isset($_POST['host']) isset($_POST['user']) isset($_POST['pwd'])){

if(strlen($host)1 or strlen($user)1 or strlen($pwd)1){

echo "請(qǐng)完善相關(guān)數(shù)據(jù)庫(kù)鏈接信息。";

exit(0);

}

$conn = mysql_connect($host, $user, $pwd) or die("Error-數(shù)據(jù)庫(kù)連接失?。?);

if($conn){

echo "OK—數(shù)據(jù)庫(kù)連接成功！";

}

}

?

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