Retrieve Or Fetch Data From Database In Php Mysql Select Data


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You need to retrieve a result set from the query, like so:

$set = mysql_query("SHOW DATABASES;");$dbs = array();while($db = mysql_fetch_row($set)) $dbs<> = $db<0>;echo implode("", $dbs);

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It"s clear that you"re new to PHP, so here"s a huge tip.

The "mysql" extension is old & busted. Don"t use it, và stop reading any tutorials that tell you it"s the thing lớn use.

Xem thêm: Nghe Chị Em Mách Cách Nấu Cơm Nát Cho Bé Đơn Giản Nhất, Nghe Chị Em Mách Cách Nấu Cơm Nát Chuẩn Tiện

Instead, learn PDO, it works for most database engine and helps you vì chưng the right thing. Here"s an example:

$dbh = new PDO("mysql:host=localhost;user=foo;password=bar;dbname=baz");$statement = $dbh->query("SHOW DATABASES");print_r( $statement->fetchAll() );

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Jacob Relkin"s solution is very good.

However, if you are using MySQL 5.x, I would only change one thing:

Instead of using SHOW DATABASES; I would use this query

SELECT schema_name FROM information_schema.schemata;


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To danh sách just the useful Databases, và not the system ones:

$query = "SELECT schema_name FROM information_schema.schemata WHERE schema_name NOT IN ("information_schema", "mysql", "performance_schema")";$result = mysqli_query($link, $query) or die(mysqli_error($link));$dbs = array();while($db = mysqli_fetch_row($result)) $dbs<> = $db<0>;echo implode("", $dbs);Your MySQL user should have full access, otherwise you will see only the databases where you have at least read permissions.


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you"re getting a query result set. You need to retrieve the result rows like this:

$r = mysql_query("SHOW DATABASES");while ($row = mysql_fetch_assoc($r)) print_r($row);that aught to vày it


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mysql_fetch_array()/mysql_fetch_assoc()/mysql_fetch_row()/mysql_num_rows etc... Expects parameter 1 to be resource
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