Handles generated columns correctly in Db\APIs\MySQL::backup_table()

Signed-off-by: Jon Stovell <jonstovell@gmail.com>

Author: Sesquipedalian

Sources/Db/APIs/MySQL.php

@@ -929,6 +929,9 @@ public function backup_table(string $table, string $backup_table): object|bool
 			],
 		);
 
+		// Do we have any generated columns to deal with?
+		$existing_columns = $this->list_columns($table, true);
+
 		// Can we do this the quick way?
 		$result = $this->query(
 			'CREATE TABLE {raw:backup_table} LIKE {raw:table}',
@@ -938,19 +941,28 @@ public function backup_table(string $table, string $backup_table): object|bool
 			],
 		);
 
-		// If this failed, we go old school.
 		if ($result) {
+			$columns = [];
+
+			foreach ($existing_columns as $column) {
+				// Skip generated columns in the insert statement.
+				if (!empty($column['generation_expression'])) {
+					$columns[] = $column['name'];
+				}
+			}
+
 			$request = $this->query(
 				'INSERT INTO {raw:backup_table}
-				SELECT *
+				({raw:columns})
+				SELECT {raw:columns}
 				FROM {raw:table}',
 				[
 					'backup_table' => $backup_table,
 					'table' => $table,
+					'columns' => implode(', ', $columns),
 				],
 			);
 
-			// Old school or no school?
 			if ($request) {
 				return $request;
 			}
@@ -1047,6 +1059,13 @@ public function backup_table(string $table, string $backup_table): object|bool
 			);
 		}
 
+		// Restore the generation expressions on any generated columns.
+		foreach ($existing_columns as $column) {
+			if (!empty($column['generation_expression'])) {
+				$this->change_column($backup_table, $column['name'], $column);
+			}
+		}
+
 		return $request;
 	}
 
@@ -2136,7 +2155,7 @@ public function list_columns(string $table_name, bool $detail = false, array $pa
 				}
 
 				if (str_contains($row['Extra'], 'GENERATED')) {
-					$columns[$row['Field']]['generation_expression'] = $row['generation_expression'];
+					$columns[$row['Field']]['generation_expression'] = $this->unescape_string($row['generation_expression']);
 					$columns[$row['Field']]['stored'] = str_contains($row['Extra'], 'STORED');
 				}
 			}