Unify database user name to "root"

Using "root" as the user name makes sense considering that
with the SQLite driver, the user gets all available permissions.

Author: JanJakes

tests/WP_SQLite_Driver_Tests.php

@@ -2834,7 +2834,7 @@ public function testShowGrantsFor() {
 			$result,
 			array(
 				(object) array(
-					'Grants for root@localhost' => 'GRANT SELECT, INSERT, UPDATE, DELETE, CREATE, DROP, RELOAD, SHUTDOWN, PROCESS, FILE, REFERENCES, INDEX, ALTER, SHOW DATABASES, SUPER, CREATE TEMPORARY TABLES, LOCK TABLES, EXECUTE, REPLICATION SLAVE, REPLICATION CLIENT, CREATE VIEW, SHOW VIEW, CREATE ROUTINE, ALTER ROUTINE, CREATE USER, EVENT, TRIGGER, CREATE TABLESPACE, CREATE ROLE, DROP ROLE ON *.* TO `root`@`localhost` WITH GRANT OPTION',
+					'Grants for root@%' => 'GRANT SELECT, INSERT, UPDATE, DELETE, CREATE, DROP, RELOAD, SHUTDOWN, PROCESS, FILE, REFERENCES, INDEX, ALTER, SHOW DATABASES, SUPER, CREATE TEMPORARY TABLES, LOCK TABLES, EXECUTE, REPLICATION SLAVE, REPLICATION CLIENT, CREATE VIEW, SHOW VIEW, CREATE ROUTINE, ALTER ROUTINE, CREATE USER, EVENT, TRIGGER, CREATE TABLESPACE, CREATE ROLE, DROP ROLE ON *.* TO `root`@`localhost` WITH GRANT OPTION',
 				),
 			)
 		);
@@ -4188,7 +4188,7 @@ public function getReservedPrefixTestData(): array {
 	public function testInformationSchemaIsReadonly( string $query ): void {
 		$this->assertQuery( 'CREATE TABLE t1 (id INT)' );
 		$this->expectException( WP_SQLite_Driver_Exception::class );
-		$this->expectExceptionMessage( "Access denied for user 'sqlite'@'%' to database 'information_schema'" );
+		$this->expectExceptionMessage( "Access denied for user 'root'@'%' to database 'information_schema'" );
 		$this->assertQuery( $query );
 	}
 
@@ -4220,7 +4220,7 @@ public function getInformationSchemaIsReadonlyTestData(): array {
 	public function testInformationSchemaIsReadonlyWithUse( string $query ): void {
 		$this->assertQuery( 'CREATE TABLE t1 (id INT)' );
 		$this->expectException( WP_SQLite_Driver_Exception::class );
-		$this->expectExceptionMessage( "Access denied for user 'sqlite'@'%' to database 'information_schema'" );
+		$this->expectExceptionMessage( "Access denied for user 'root'@'%' to database 'information_schema'" );
 		$this->assertQuery( 'USE information_schema' );
 		$this->assertQuery( $query );
 	}
@@ -9808,7 +9808,7 @@ public function testNonEmptyColumnMeta(): void {
 		// SHOW GRANTS
 		$this->assertQuery( 'SHOW GRANTS' );
 		$this->assertSame( 1, $this->engine->get_last_column_count() );
-		$this->assertSame( 'Grants for root@localhost', $this->engine->get_last_column_meta()[0]['name'] );
+		$this->assertSame( 'Grants for root@%', $this->engine->get_last_column_meta()[0]['name'] );
 
 		// SHOW VARIABLES
 		$this->assertQuery( 'SHOW VARIABLES' );

wp-includes/sqlite-ast/class-wp-sqlite-driver.php

@@ -2312,7 +2312,7 @@ private function execute_show_statement( WP_Parser_Node $node ): void {
 				$this->set_results_from_fetched_data(
 					array(
 						(object) array(
-							'Grants for root@localhost' => 'GRANT SELECT, INSERT, UPDATE, DELETE, CREATE, DROP, RELOAD, SHUTDOWN, PROCESS, FILE, REFERENCES, INDEX, ALTER, SHOW DATABASES, SUPER, CREATE TEMPORARY TABLES, LOCK TABLES, EXECUTE, REPLICATION SLAVE, REPLICATION CLIENT, CREATE VIEW, SHOW VIEW, CREATE ROUTINE, ALTER ROUTINE, CREATE USER, EVENT, TRIGGER, CREATE TABLESPACE, CREATE ROLE, DROP ROLE ON *.* TO `root`@`localhost` WITH GRANT OPTION',
+							'Grants for root@%' => 'GRANT SELECT, INSERT, UPDATE, DELETE, CREATE, DROP, RELOAD, SHUTDOWN, PROCESS, FILE, REFERENCES, INDEX, ALTER, SHOW DATABASES, SUPER, CREATE TEMPORARY TABLES, LOCK TABLES, EXECUTE, REPLICATION SLAVE, REPLICATION CLIENT, CREATE VIEW, SHOW VIEW, CREATE ROUTINE, ALTER ROUTINE, CREATE USER, EVENT, TRIGGER, CREATE TABLESPACE, CREATE ROLE, DROP ROLE ON *.* TO `root`@`localhost` WITH GRANT OPTION',
 						),
 					)
 				);
@@ -2322,7 +2322,7 @@ private function execute_show_statement( WP_Parser_Node $node ): void {
 						'pdo_type'    => PDO::PARAM_STR,
 						'flags'       => array( 'not_null' ),
 						'table'       => '',
-						'name'        => 'Grants for root@localhost',
+						'name'        => 'Grants for root@%',
 						'len'         => 4096,
 						'precision'   => 31,
 					),
@@ -5846,7 +5846,7 @@ private function new_not_supported_exception( string $cause ): WP_SQLite_Driver_
 	 */
 	private function new_access_denied_to_information_schema_exception(): WP_SQLite_Driver_Exception {
 		return $this->new_driver_exception(
-			"Access denied for user 'sqlite'@'%' to database 'information_schema'",
+			"Access denied for user 'root'@'%' to database 'information_schema'",
 			'42000'
 		);
 	}