/**
* Perform upgrade for a table, by comparing one table to an old version
* of the same table
*
* @param B2DBTable $old_table
*/
public function upgrade(B2DBTable $old_table)
{
if ($old_table->getVersion() != $this->getVersion() - 1) {
throw new B2DBException('Cannot upgrade from ' . get_class($old_table) . ' version ' . $old_table->getVersion() . ', must be version ' . ($this->getVersion() - 1));
}
$old_columns = $old_table->getColumns();
$new_columns = $this->getColumns();
$added_columns = array_diff_key($new_columns, $old_columns);
$altered_columns = array_diff($old_columns, $new_columns);
$dropped_columns = array_keys(array_diff_key($old_columns, $new_columns));
$sqls = array();
foreach ($added_columns as $column => $details) {
$sqls[] = $this->_getAddColumnSQL($column, $details);
}
if (count($sqls)) {
foreach ($sqls as $sqlStmt) {
$statement = B2DBStatement::getPreparedStatement($sqlStmt);
$res = $statement->performQuery('alter');
}
}
$this->_migrateData($old_table);
$sqls = array();
foreach ($altered_columns as $column) {
$sqls[] = $this->_getAlterColumnSQL($column, $new_columns[$column]);
}
foreach ($dropped_columns as $column) {
$sqls[] = $this->_getDropColumnSQL($column);
}
if (count($sqls)) {
foreach ($sqls as $sqlStmt) {
$statement = B2DBStatement::getPreparedStatement($sqlStmt);
$res = $statement->performQuery('alter');
}
}
}
