/**
* Drop removed types
* Add new types
* Apply type definition differences, updating the type's tables along the way
*
* @param $ofs output file segmenter
* @param $old_schema original schema
* @param $new_schema new schema
*/
public static function apply_changes($ofs, $old_schema, $new_schema)
{
// drop any types that are no longer defined
self::drop_types($ofs, $old_schema, $new_schema);
// create any types that are new in the new definition
self::create_types($ofs, $old_schema, $new_schema);
// there is no alter for types
// find types that still exist that are different
// placehold type data in table columns, and recreate the type
foreach (dbx::get_types($new_schema) as $new_type) {
// does type exist in old definition ?
if ($old_schema == NULL || !mssql10_schema::contains_type($old_schema, $new_type['name'])) {
continue;
}
$old_type = dbx::get_type($old_schema, $new_type['name']);
// is there a difference between the old and new type definitions?
if (mssql10_type::equals($old_schema, $old_type, $new_schema, $new_type)) {
continue;
}
$columns = array();
$ofs->write("-- type " . $new_type['name'] . " definition migration (1/4): dependant tables column constraint drop\n");
$ofs->write(mssql10_type::column_constraint_temporary_drop($columns, $old_schema, $old_type) . "\n");
$ofs->write("-- type " . $new_type['name'] . " definition migration (2/4): delete type list values\n");
$ofs->write(mssql10_type::get_enum_value_delete($old_schema, $old_type) . "\n");
$ofs->write("-- type " . $new_type['name'] . " definition migration (3/4): recreate type list values\n");
$ofs->write(mssql10_type::get_enum_value_insert($new_schema, $new_type) . "\n");
$ofs->write("-- type " . $new_type['name'] . " definition migration (4/4): restore dependant tables column constraint add\n");
$ofs->write(mssql10_type::column_constraint_restore($columns, $new_schema, $new_type) . "\n");
}
}
/**
* Outputs DDL for differences in functions
*
* @param $ofs1 stage1 output pointer
* @param $ofs3 stage3 output pointer
* @param $old_schema original schema
* @param $new_schema new schema
*/
public static function diff_functions($ofs1, $ofs3, $old_schema, $new_schema)
{
// drop functions that no longer exist in stage 3
if ($old_schema != NULL) {
foreach (dbx::get_functions($old_schema) as $old_function) {
if (!mssql10_schema::contains_function($new_schema, mssql10_function::get_declaration($new_schema, $old_function))) {
$ofs3->write(mssql10_function::get_drop_sql($old_schema, $old_function) . "\n");
}
}
}
// Add new functions and replace modified functions
foreach (dbx::get_functions($new_schema) as $new_function) {
$old_function = NULL;
if ($old_schema != NULL) {
$old_function = dbx::get_function($old_schema, $new_function['name'], mssql10_function::get_declaration($new_schema, $new_function));
}
if ($old_function == NULL) {
$ofs1->write(mssql10_function::get_creation_sql($new_schema, $new_function) . "\n");
} else {
if (!mssql10_function::equals($new_schema, $new_function, $old_function, mssql10_diff::$ignore_function_whitespace)) {
// functions are not equal, old_function is not null, it previously existed
// for MSSQL, there is no CREATE OR REPLACE FUNCTION, so drop the function explicitly
$ofs1->write(mssql10_function::get_drop_sql($old_schema, $old_function) . "\n");
$ofs1->write(mssql10_function::get_creation_sql($new_schema, $new_function) . "\n");
} else {
if (isset($new_function['forceRedefine']) && strcasecmp($new_function['forceRedefine'], 'true') == 0) {
$ofs1->write("-- DBSteward insists on function recreation: " . $new_schema['name'] . "." . $new_function['name'] . " has forceRedefine set to true\n");
$ofs1->write(mssql10_function::get_creation_sql($new_schema, $new_function) . "\n");
} else {
if (mssql10_schema::contains_type($new_schema, $new_function['returns']) && mssql10_schema::contains_type($old_schema, $new_function['returns']) && !mssql10_type::equals(dbx::get_type($old_schema, $new_function['returns']), dbx::get_type($new_schema, $new_function['returns']))) {
$ofs1->write("-- dbstward insisting on function re-creation " . $new_function['name'] . " for type " . $new_function['returns'] . " definition change\n");
$ofs1->write(mssql10_function::get_drop_sql($old_schema, $old_function) . "\n");
$ofs1->write(mssql10_function::get_creation_sql($new_schema, $new_function) . "\n");
}
}
}
}
}
}
