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MDL-15669 Check db schema vs install.xml - code by Andrei Bautu, with minor changes only (more strict checking)

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skodak 2008-08-25 22:02:49 +00:00
parent 5bfa6da067
commit f4caf0df5e
1 changed files with 97 additions and 0 deletions
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97
lib/ddl/database_manager.php
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@ -906,6 +906,103 @@ if (!is_object($xmldb_key)) {
$this->execute_sql_arr($sqlarr);
}
/**
* Reads the install.xml files for Moodle core and modules and returns an array of
* xmldb_structure object with xmldb_table from these files.
* @return xmldb_structure schema from install.xml files
*/
public function get_install_xml_schema() {
global $CFG;
$schema = new xmldb_structure('export');
$schema->setVersion($CFG->version);
$dbdirs = get_db_directories();
foreach ($dbdirs as $dbdir) {
$xmldb_file = new xmldb_file($dbdir.'/install.xml');
if (!$xmldb_file->fileExists() or !$xmldb_file->loadXMLStructure()) {
continue;
}
$structure = $xmldb_file->getStructure();
$tables = $structure->getTables();
foreach ($tables as $table) {
$table->setPrevious(null);
$table->setNext(null);
$schema->addTable($table);
}
}
return $schema;
}
/**
* Checks the database schema against a schema specified by an xmldb_structure object
* @param xmldb_structure $schema export schema describing all known tables
* @return array keyed by table name with array of difference messages as values
*/
public function check_database_schema(xmldb_structure $schema) {
$errors = array();
$dbtables = $this->mdb->get_tables();
$tables = $schema->getTables();
//TODO: maybe add several levels error/warning
// make sure that current and schema tables match exactly
foreach ($tables as $table) {
$tablename = $table->getName();
if (empty($dbtables[$tablename])) {
if (!isset($errors[$tablename])) {
$errors[$tablename] = array();
}
$errors[$tablename][] = "Table $tablename is missing in database."; //TODO: localize
continue;
}
// a) check for required fields
$dbfields = $this->mdb->get_columns($tablename, false);
$fields = $table->getFields();
foreach ($fields as $field) {
$fieldname = $field->getName();
if (empty($dbfields[$fieldname])) {
if (!isset($errors[$tablename])) {
$errors[$tablename] = array();
}
$errors[$tablename][] = "Field $fieldname is missing in table $tablename."; //TODO: localize
}
unset($dbfields[$fieldname]);
}
// b) check for extra fields (indicates unsupported hacks) - modify install.xml if you want the script to continue ;-)
foreach ($dbfields as $fieldname=>$info) {
if (!isset($errors[$tablename])) {
$errors[$tablename] = array();
}
$errors[$tablename][] = "Field $fieldname is not expected in table $tablename."; //TODO: localize
}
unset($dbtables[$tablename]);
}
// look for unsupported tables - local custom tables should be in /local/db/install.xml ;-)
// if there is no prefix, we can not say if tale is ours :-(
if ($this->generator->prefix !== '') {
foreach ($dbtables as $tablename=>$unused) {
if (strpos($tablename, 'pma_') === 0) {
// ignore phpmyadmin tables for now
continue;
}
if (strpos($tablename, 'test') === 0) {
// ignore broken results of unit tests
continue;
}
if (!isset($errors[$tablename])) {
$errors[$tablename] = array();
}
$errors[$tablename][] = "Table $tablename is not expected."; //TODO: localize
}
}
return $errors;
}
}