+ protected function doSelectDomain( DatabaseDomain $domain ) {
+ if ( $domain->getSchema() !== null ) {
+ throw new DBExpectedError(
+ $this,
+ __CLASS__ . ": domain '{$domain->getId()}' has a schema component"
+ );
+ }
+
+ $database = $domain->getDatabase();
+ // A null database means "don't care" so leave it as is and update the table prefix
+ if ( $database === null ) {
+ $this->currentDomain = new DatabaseDomain(
+ $this->currentDomain->getDatabase(),
+ null,
+ $domain->getTablePrefix()
+ );
+
+ return true;
+ }
+
+ if ( $database !== $this->getDBname() ) {
+ throw new DBExpectedError(
+ $this,
+ __CLASS__ . ": cannot change database (got '$database')"
+ );
+ }
+
+ return true;
+ }
+