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I wonder how can I get the list of MySQL databases in PHP using PDO without having to connect to a database first ( I mean no dbname in dsn )?

Usually I used to use the function mysql_list_dbs() but I no longer use mysql this way.



You can use

show databases

or a query on the information_schema:

select schema_name from information_schema.schemata
Monday, September 5, 2022

The following works for me:


$pdo = new PDO("mysql:host=localhost;dbname=test", "root", "pass");
$pdo->setAttribute(PDO::ATTR_EMULATE_PREPARES, false);

$stmt = $pdo->prepare("INSERT INTO `null_test` (`can_be_null`) VALUES (:null)");
$stmt->bindValue(":null", null, PDO::PARAM_NULL);


Pass in PHP's null, with type of PDO::PARAM_NULL. Also, make sure your prepare emulation is set to false. That might help.

Sunday, August 7, 2022

You've got a few choices:

SELECT @@IDENTITY - return the last ID created by actions of the current connection, regardless of table/scope

SELECT SCOPE_IDENTITY() - last ID produced by the current connection, in scope, regardless of table

SELECT IDENT_CURRENT('name_of_table'); - last ID produced on that table, regardless of table/scope/connection

Of the three, SCOPE_IDENTITY() is the best candidate.

Saturday, October 1, 2022

lastInsertId() is a method of the PDO class, not the PDOStatement class.

This should work:

$groupID = $dbo->lastInsertId();
Friday, November 18, 2022

You can use ReflectionClass::getStaticProperties() to do this:

$class = new ReflectionClass('MyClass');
$arr = $class->getStaticProperties();
    [var1] => a
    [var2] => b
Saturday, October 8, 2022
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