function Schema::findTables

Overrides Schema::findTables

File

core/lib/Drupal/Core/Database/Driver/pgsql/Schema.php, line 504

Class

Schema

PostgreSQL implementation of \Drupal\Core\Database\Schema.

Namespace

Code

public function findTables($table_expression) {
    $individually_prefixed_tables = $this->connection
        ->getUnprefixedTablesMap();
    $default_prefix = $this->connection
        ->tablePrefix();
    $default_prefix_length = strlen($default_prefix);
    $tables = [];
    // Load all the tables up front in order to take into account per-table
    // prefixes. The actual matching is done at the bottom of the method.
    $results = $this->connection
        ->query("SELECT tablename FROM pg_tables WHERE schemaname = :schema", [
        ':schema' => $this->defaultSchema,
    ]);
    foreach ($results as $table) {
        // Take into account tables that have an individual prefix.
        if (isset($individually_prefixed_tables[$table->tablename])) {
            $prefix_length = strlen($this->connection
                ->tablePrefix($individually_prefixed_tables[$table->tablename]));
        }
        elseif ($default_prefix && substr($table->tablename, 0, $default_prefix_length) !== $default_prefix) {
            // This table name does not start the default prefix, which means that
            // it is not managed by Drupal so it should be excluded from the result.
            continue;
        }
        else {
            $prefix_length = $default_prefix_length;
        }
        // Remove the prefix from the returned tables.
        $unprefixed_table_name = substr($table->tablename, $prefix_length);
        // The pattern can match a table which is the same as the prefix. That
        // will become an empty string when we remove the prefix, which will
        // probably surprise the caller, besides not being a prefixed table. So
        // remove it.
        if (!empty($unprefixed_table_name)) {
            $tables[$unprefixed_table_name] = $unprefixed_table_name;
        }
    }
    // Convert the table expression from its SQL LIKE syntax to a regular
    // expression and escape the delimiter that will be used for matching.
    $table_expression = str_replace([
        '%',
        '_',
    ], [
        '.*?',
        '.',
    ], preg_quote($table_expression, '/'));
    $tables = preg_grep('/^' . $table_expression . '$/i', $tables);
    return $tables;
}