Thin PDO Wrapper

A simple database client utilizing PHP PDO.

Advantages

• Maintains at most one connection to slave DB and one to master DB per request.
• Automatically uses slave connection for data retrieval, master for writes.
• Randomized slave connection, with automatic fallback to master if no slaves exist.
• Enforces data sanitization (using PDO prepared statements and bind parameters).
• Catches all errors, and writes them to error log if configured to do so.
• Automatic timestamps for creates and updates
• Handles multiple inserts with a single query.
• Fallback to custom queries if one needs to do a join or second order query.
• Deals exclusively with associative arrays for input/output

Configuration

Master

  $pdo->configMaster(
    'myhostname.example',
    'my_database_name',
    'my_database_user',
    'my_database_password',
    'my_database_port' // optional
  );

Slaves (optional)

  $pdo->configSlave(
    'myhostname1.example',
    'my_database_name',
    'my_database_user',
    'my_database_password',
    'my_database_port' // optional
  );

  $pdo->configSlave(
    'myhostname2.example',
    'my_database_name',
    'my_database_user',
    'my_database_password',
    'my_database_port' // optional
  );
  // etc

Examples

Selecting

  $results = PDOWrapper::instance()->select('post', array('thread_id'=>$thread_id));
  $results = PDOWrapper::instance()->select('thread', array('open'=>0), $limit+1, $start, array('favs'=>'DESC'));

Inserting

  $invite_id = PDOWrapper::instance()->insert('invite', array(
    'user_id' => $user_id,
    'text' => $text,
    'invite_key' => $invite_key
  ));

Complex Queries with bind parameters

  $post = PDOWrapper::instance()->queryFirst('
    SELECT invite.*, user.name FROM invite
    LEFT JOIN user ON user.id=invite.user_id
    WHERE invite_key=:invite_key
  ', array(':invite_key'=>$invite_key));