/**
* generates the sql for altering an existing table on postgresql
*
* @param string $name name of the table that is intended to be changed.
* @param array $changes associative array that contains the details of each type *
* @param boolean $check indicates whether the function should just check if the DBMS driver
* can perform the requested table alterations if the value is true or
* actually perform them otherwise.
* @see Doctrine_Export::alterTable()
* @return array
* @override
*/
public function getAlterTableSql($name, array $changes, $check = false)
{
foreach ($changes as $changeName => $change) {
switch ($changeName) {
case 'add':
case 'remove':
case 'change':
case 'name':
case 'rename':
break;
default:
throw DoctrineException::alterTableChangeNotSupported($changeName);
}
}
if ($check) {
return true;
}
$sql = array();
if (isset($changes['add']) && is_array($changes['add'])) {
foreach ($changes['add'] as $fieldName => $field) {
$query = 'ADD ' . $this->getColumnDeclarationSql($fieldName, $field);
$sql[] = 'ALTER TABLE ' . $name . ' ' . $query;
}
}
if (isset($changes['remove']) && is_array($changes['remove'])) {
foreach ($changes['remove'] as $fieldName => $field) {
$query = 'DROP ' . $fieldName;
$sql[] = 'ALTER TABLE ' . $name . ' ' . $query;
}
}
if (isset($changes['change']) && is_array($changes['change'])) {
foreach ($changes['change'] as $fieldName => $field) {
if (isset($field['type'])) {
$serverInfo = $this->getServerVersion();
if (is_array($serverInfo) && $serverInfo['major'] < 8) {
throw DoctrineException::changeColumnRequiresPostgreSQL8OrAbove($field['type']);
}
$query = 'ALTER ' . $fieldName . ' TYPE ' . $this->getTypeDeclarationSql($field['definition']);
$sql[] = 'ALTER TABLE ' . $name . ' ' . $query;
}
if (array_key_exists('default', $field)) {
$query = 'ALTER ' . $fieldName . ' SET DEFAULT ' . $this->quote($field['definition']['default'], $field['definition']['type']);
$sql[] = 'ALTER TABLE ' . $name . ' ' . $query;
}
if (!empty($field['notnull'])) {
$query = 'ALTER ' . $fieldName . ' ' . ($field['definition']['notnull'] ? 'SET' : 'DROP') . ' NOT NULL';
$sql[] = 'ALTER TABLE ' . $name . ' ' . $query;
}
}
}
if (isset($changes['rename']) && is_array($changes['rename'])) {
foreach ($changes['rename'] as $fieldName => $field) {
$sql[] = 'ALTER TABLE ' . $name . ' RENAME COLUMN ' . $fieldName . ' TO ' . $field['name'];
}
}
if (isset($changes['name'])) {
$sql[] = 'ALTER TABLE ' . $name . ' RENAME TO ' . $changes['name'];
}
return $sql;
}
