Clarify SQLite PDO accessor

Rename the export helper to make explicit that it returns the underlying SQLite PDO connection.

Author: JanJakes

src/Export.php

@@ -197,7 +197,7 @@ protected function get_create_statement( $table_name ) {
 	 */
 	protected function get_insert_statements( $table_name ) {
 		$quoted_table_name = $this->quote_identifier( $table_name );
-		$stmt              = $this->get_pdo()->query( 'SELECT * FROM ' . $quoted_table_name );
+		$stmt              = $this->get_sqlite_pdo()->query( 'SELECT * FROM ' . $quoted_table_name );
 		// phpcs:ignore
 		while ( $row = $stmt->fetch( PDO::FETCH_ASSOC, PDO::FETCH_ORI_NEXT ) ) {
 			yield sprintf( 'INSERT INTO %1s VALUES (%2s);', $quoted_table_name, $this->escape_values( $row ) );
@@ -310,7 +310,7 @@ protected function get_dump_comment( $comment ) {
 	 */
 	protected function table_has_records( $table_name ) {
 		$table_name = $this->quote_identifier( $table_name );
-		$stmt       = $this->get_pdo()->query( 'SELECT COUNT(*) FROM ' . $table_name );
+		$stmt       = $this->get_sqlite_pdo()->query( 'SELECT COUNT(*) FROM ' . $table_name );
 		return $stmt->fetchColumn() > 0;
 	}
 
@@ -325,11 +325,11 @@ protected function quote_identifier( $identifier ) {
 	}
 
 	/**
-	 * Get the PDO instance.
+	 * Get the underlying SQLite PDO instance.
 	 *
 	 * @return PDO
 	 */
-	protected function get_pdo() {
+	protected function get_sqlite_pdo() {
 		if ( $this->driver instanceof WP_SQLite_Translator ) {
 			return $this->driver->get_pdo();
 		}