fix(database): support inserting empty rows (#1515)

Author: innocenzi

packages/database/src/QueryStatements/InsertStatement.php

@@ -46,12 +46,19 @@ public function compile(DatabaseDialect $dialect): string
             })
             ->implode(', ');
 
-        $sql = sprintf(
-            'INSERT INTO %s (%s) VALUES %s',
-            $this->table,
-            $columns->map(fn (string $column) => "`{$column}`")->implode(', '),
-            $entryPlaceholders,
-        );
+        if ($columns->isEmpty()) {
+            $sql = match ($dialect) {
+                DatabaseDialect::MYSQL => sprintf('INSERT INTO %s () VALUES ()', $this->table),
+                default => sprintf('INSERT INTO %s DEFAULT VALUES', $this->table),
+            };
+        } else {
+            $sql = sprintf(
+                'INSERT INTO %s (%s) VALUES %s',
+                $this->table,
+                $columns->map(fn (string $column) => "`{$column}`")->implode(', '),
+                $entryPlaceholders,
+            );
+        }
 
         if ($dialect === DatabaseDialect::POSTGRESQL) {
             $sql .= ' RETURNING *';

packages/database/tests/QueryStatements/InsertStatementTest.php

@@ -31,6 +31,16 @@ public function test_insert_statement(): void
         $this->assertSame($expectedPostgres, $statement->compile(DatabaseDialect::POSTGRESQL));
     }
 
+    public function test_insert_empty_row(): void
+    {
+        $tableDefinition = new TableDefinition('foo', 'bar');
+        $statement = new InsertStatement($tableDefinition);
+
+        $this->assertSame('INSERT INTO `foo` AS `bar` () VALUES ()', $statement->compile(DatabaseDialect::MYSQL));
+        $this->assertSame('INSERT INTO `foo` AS `bar` DEFAULT VALUES', $statement->compile(DatabaseDialect::SQLITE));
+        $this->assertSame('INSERT INTO `foo` AS `bar` DEFAULT VALUES RETURNING *', $statement->compile(DatabaseDialect::POSTGRESQL));
+    }
+
     public function test_exception_on_column_mismatch(): void
     {
         $tableDefinition = new TableDefinition('foo', 'bar');