{"record":{"id":"4a25b402ed274bd4","repo":"laravel/framework","slug":"this-database-driver-does-not-support-modifying-co","errorCode":null,"errorMessage":"This database driver does not support modifying columns.","messagePattern":"This database driver does not support modifying columns\\.","errorType":"exception","errorClass":"RuntimeException","httpStatus":null,"severity":"error","filePath":"src/Illuminate/Database/Schema/Grammars/Grammar.php","lineNumber":212,"sourceCode":"        return sprintf('alter table %s rename column %s to %s',\n            $this->wrapTable($blueprint),\n            $this->wrap($command->from),\n            $this->wrap($command->to)\n        );\n    }\n\n    /**\n     * Compile a change column command into a series of SQL statements.\n     *\n     * @param  \\Illuminate\\Database\\Schema\\Blueprint  $blueprint\n     * @param  \\Illuminate\\Support\\Fluent  $command\n     * @return list<string>|string\n     *\n     * @throws \\RuntimeException\n     */\n    public function compileChange(Blueprint $blueprint, Fluent $command)\n    {\n        throw new RuntimeException('This database driver does not support modifying columns.');\n    }\n\n    /**\n     * Compile a fulltext index key command.\n     *\n     * @param  \\Illuminate\\Database\\Schema\\Blueprint  $blueprint\n     * @param  \\Illuminate\\Support\\Fluent  $command\n     * @return string\n     *\n     * @throws \\RuntimeException\n     */\n    public function compileFulltext(Blueprint $blueprint, Fluent $command)\n    {\n        throw new RuntimeException('This database driver does not support fulltext index creation.');\n    }\n\n    /**\n     * Compile a drop fulltext index command.","sourceCodeStart":194,"sourceCodeEnd":230,"githubUrl":"https://github.com/laravel/framework/blob/e0f6eb3518ac29fbbca8529e97d0df7fc9f24481/src/Illuminate/Database/Schema/Grammars/Grammar.php#L194-L230","documentation":"Grammar::compileChange() throws RuntimeException on the base; all four shipped grammars override it. It compiles the SQL for a column-modify command ($table->...->change()). Reaching the base means the active grammar is the unimplemented base class - i.e. a custom driver that cannot emit ALTER TABLE ... MODIFY statements.","triggerScenarios":"Issuing $table->integer('foo')->change() (or any ->change() call) in a migration on a connection whose SchemaGrammar is the base Grammar. The Blueprint builds a change command, dispatches it to the grammar, and the base refuses.","commonSituations":"A custom driver whose grammar was scaffolded but compileChange was never written; a test that injects the base Grammar; running migrations against an experimental engine.","solutions":["Run modify-column migrations on sqlite/mysql/pgsql/sqlsrv.","Implement compileChange() in your custom grammar (it must return one or more ALTER statements appropriate to the engine).","Rewrite the migration to drop and recreate the column instead of using ->change() where the engine allows."],"exampleFix":"// before - throws on a custom driver that lacks compileChange\nSchema::table('users', function (Blueprint $t) {\n    $t->string('email', 320)->change();\n});\n\n// after - raw ALTER for the unsupported engine\nDB::connection('custom')->statement('ALTER TABLE users MODIFY email VARCHAR(320)');","handlingStrategy":"type-guard","validationCode":"$grammar = Schema::getConnection()->getSchemaGrammar();\nif (get_class($grammar) === \\Illuminate\\Database\\Schema\\Grammars\\Grammar::class) {\n    throw new \\DomainException('Connection uses the base Grammar; ->change() is unsupported.');\n}","typeGuard":"function supportsCompileChange(\\Illuminate\\Database\\Schema\\Grammars\\Grammar $grammar): bool\n{\n    return (new \\ReflectionMethod($grammar, 'compileChange'))\n        ->getDeclaringClass()->getName() !== \\Illuminate\\Database\\Schema\\Grammars\\Grammar::class;\n}","tryCatchPattern":"try {\n    Schema::table('users', fn ($t) => $t->string('email', 320)->change());\n} catch (\\RuntimeException $e) {\n    if (str_contains($e->getMessage(), 'modifying columns')) {\n        DB::statement('ALTER TABLE users MODIFY email VARCHAR(320)');\n    } else {\n        throw $e;\n    }\n}","preventionTips":["Run ->change() migrations only on sqlite/mysql/pgsql/sqlsrv.","Implement compileChange in any custom grammar.","For experimental engines, prefer drop+recreate column over ->change() in migrations."],"tags":["schema","grammar","database-driver","migrations","alter-column","runtime-exception"],"backgroundTag":null,"analyzedSha":"e0f6eb3518ac29fbbca8529e97d0df7fc9f24481","analyzedAt":"2026-08-11T20:52:37.562Z","contentChangedAt":null,"schemaVersion":2},"datasetVersion":"2026-09-23T08:17:48.524Z"}