function execute()
{
$migrations = array();
foreach ($this->available_migrations as $migration) {
if (!in_array($migration, $this->schema_migrations)) {
$migrations[] = $migration;
}
}
sort($migrations);
foreach ($migrations as $migration) {
$query = $this->get_migration_contents($migration);
if ($query === false) {
throw new Exception("Could not read migration {$migration}.");
}
if ($this->run_query($query) === false) {
throw new Exception("Failed to execute migration {$migration}. " . pg_last_error());
}
$schema_migration = new SchemaMigration();
$schema_migration->version = $migration;
$schema_migration->save();
}
}
