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<?php
Database::addConnectionInfo('mannirdb', 'default', array(
        'driver' => 'mysql',
        'database' => 'mannirdb',
        'username' => 'root',
        'password' => '',
        'host' => 'localhost',
        'prefix' => '',
    ));

    $q1 = Database::getConnection('default', 'mannirdb')->select('_mytable', 'r');
    $q1->addExpression('COUNT(DISTINCT(id))', 'cnt');
//    $query->addField('nfd', 'nid');
//    $query->condition('nfd.title', 'Potato');
//    $query->range(0, 1);
    $users1 = $q1->execute()->fetchField();
    drupal_set_message("mannirdb=$users1");
    
    
    
    
    
    


Database::addConnectionInfo('abc', 'default', array(
        'driver' => 'mysql',
        'database' => 'abcoae5_db',
        'username' => 'root',
        'password' => '',
        'host' => 'localhost',
        'prefix' => '',
    ));

    Database::addConnectionInfo('ksp', 'default', array(
        'driver' => 'mysql',
        'database' => 'kanopo5_db',
        'username' => 'root',
        'password' => '',
        'host' => 'localhost',
        'prefix' => '',
    ));

    $q1 = Database::getConnection('default', 'default')->select('users', 'u');
    $q1->addExpression('COUNT(DISTINCT(uid))', 'cnt');
    $my_users = $q1->execute()->fetchField();

    $q1 = Database::getConnection('default', 'abc')->select('users', 'u');
    $q1->addExpression('COUNT(DISTINCT(uid))', 'cnt');
    $abc_users = $q1->execute()->fetchField();

    $q1 = Database::getConnection('default', 'ksp')->select('users', 'u');
    $q1->addExpression('COUNT(DISTINCT(uid))', 'cnt');
    $ksp_users = $q1->execute()->fetchField();
    drupal_set_message("my_users=$my_users, abcc_users=$abc_users, ksp_users=$ksp_users");