feat: implement dynamic database management via MySQL driver and API controllers

backend/app/Http/Controllers/Api/SchemaController.php

@@ -109,7 +109,7 @@ class SchemaController extends Controller
     {
         try {
             $this->initializeDriver($request);
-            $config = $request->only(['host', 'username', 'password', 'database', 'port']);
+            $config = $request->only(['host', 'username', 'password', 'database', 'port', 'table']);
             $filePath = $this->databaseService->export($config);
             
             return Response::download($filePath)->deleteFileAfterSend(true);
@@ -154,4 +154,26 @@ class SchemaController extends Controller
             return Response::json(['error' => $e->getMessage()], 400);
         }
     }
+
+    public function tableMetadata(Request $request, $database, $table)
+    {
+        try {
+            $request->merge(['database' => $database]);
+            $this->initializeDriver($request);
+            return Response::json($this->databaseService->getTableMetadata($database, $table));
+        } catch (\Exception $e) {
+            return Response::json(['error' => $e->getMessage()], 400);
+        }
+    }
+
+    public function truncate(Request $request, $table)
+    {
+        try {
+            $this->initializeDriver($request);
+            $this->databaseService->truncateTable($table);
+            return Response::json(['message' => "Table '{$table}' truncated successfully"]);
+        } catch (\Exception $e) {
+            return Response::json(['error' => $e->getMessage()], 400);
+        }
+    }
 }

backend/app/Services/Database/MySqlDriver.php

@@ -114,10 +114,16 @@ class MySqlDriver implements DatabaseDriverInterface, SchemaDiscoveryInterface
         $host = $config['host'] ?? '127.0.0.1';
         $port = $config['port'] ?? '3306';
         $database = $config['database'] ?? '';
+        $table = $config['table'] ?? '';
 
         // Build command with flags for a complete and resilient export
         $passwordPart = !empty($password) ? "-p" . escapeshellarg($password) : "";
-        $dbPart = !empty($database) ? escapeshellarg($database) : "--all-databases";
+        
+        if (!empty($table) && !empty($database)) {
+            $dbPart = escapeshellarg($database) . " " . escapeshellarg($table);
+        } else {
+            $dbPart = !empty($database) ? escapeshellarg($database) : "--all-databases";
+        }
         
         // --single-transaction: for InnoDB tables, ensures consistency without locking
         // --skip-lock-tables: avoids issues with views/definers that might prevent locking
@@ -225,4 +231,35 @@ class MySqlDriver implements DatabaseDriverInterface, SchemaDiscoveryInterface
         $results = $this->query($sql, [$database]);
         return (array) ($results[0] ?? []);
     }
+
+    public function getTableMetadata(string $database, string $table): array
+    {
+        $sql = "
+            SELECT 
+                ENGINE as engine,
+                TABLE_ROWS as rows,
+                DATA_LENGTH as data_length,
+                INDEX_LENGTH as index_length,
+                DATA_FREE as data_free,
+                AUTO_INCREMENT as auto_increment,
+                CREATE_TIME as create_time,
+                UPDATE_TIME as update_time,
+                TABLE_COLLATION as collation,
+                TABLE_COMMENT as comment
+            FROM 
+                information_schema.TABLES 
+            WHERE 
+                TABLE_SCHEMA = ? AND 
+                TABLE_NAME = ?
+        ";
+
+        $results = $this->query($sql, [$database, $table]);
+        return (array) ($results[0] ?? []);
+    }
+
+    public function truncateTable(string $table): bool
+    {
+        DB::connection($this->connectionName)->statement("TRUNCATE TABLE `{$table}`");
+        return true;
+    }
 }

backend/app/Services/DatabaseService.php

@@ -122,4 +122,20 @@ class DatabaseService
     {
         return $this->getDriver()->getDatabaseMetadata($database);
     }
+
+    /**
+     * Get table metadata.
+     */
+    public function getTableMetadata(string $database, string $table): array
+    {
+        return $this->getDriver()->getTableMetadata($database, $table);
+    }
+
+    /**
+     * Truncate a table.
+     */
+    public function truncateTable(string $table): bool
+    {
+        return $this->getDriver()->truncateTable($table);
+    }
 }

backend/routes/api.php

@@ -12,6 +12,8 @@ Route::prefix('schema')->group(function () {
     Route::get('/databases', [SchemaController::class, 'databases']);
     Route::get('/tables/{database}', [SchemaController::class, 'tables']);
     Route::get('/metadata/{database}', [SchemaController::class, 'metadata']);
+    Route::get('/metadata/{database}/{table}', [SchemaController::class, 'tableMetadata']);
+    Route::post('/truncate/{table}', [SchemaController::class, 'truncate']);
     Route::get('/{table}', [SchemaController::class, 'schema']);
     Route::get('/{table}/data', [SchemaController::class, 'data']);
     Route::post('/execute', [SchemaController::class, 'execute']);