diff --git a/Command.php b/Command.php
index 1df3274..9fa588b 100644
--- a/Command.php
+++ b/Command.php
@@ -25,235 +25,234 @@ use Throwable;
 class Command extends Component
 {
 
-	/**
-	 *
-	 */
-	const DB_ERROR_MESSAGE = 'The system is busy, please try again later.';
-
-	/** @var Connection */
-	public Connection $connection;
-
-	/** @var ?string */
-	public ?string $sql = '';
-
-	/** @var array */
-	public array $params = [];
-
-
-	/**
-	 * @param array $params
-	 * @throws Exception
-	 */
-	public function __construct(array $params = [])
-	{
-		parent::__construct();
-		Container::configure($this, $params);
-	}
-
-
-	/**
-	 * @return int|bool
-	 * @throws Exception
-	 */
-	public function incrOrDecr(): int|bool
-	{
-		return $this->_execute();
-	}
-
-	/**
-	 * @return int|bool
-	 * @throws Exception
-	 */
-	public function save(): int|bool
-	{
-		return $this->_execute();
-	}
-
-
-	/**
-	 * @return bool|array
-	 * @throws Exception
-	 */
-	public function all(): bool|array
-	{
-		try {
-			$client = $this->connection->getConnection();
-			if (($prepare = $client->prepare($this->sql)) === false) {
-				throw new Exception($client->errorInfo()[1]);
-			}
-			$prepare->execute($this->params);
-			return $prepare->fetchAll(PDO::FETCH_ASSOC);
-		} catch (Throwable $throwable) {
-			if (str_contains($throwable->getMessage(), 'MySQL server has gone away')) {
-				return $this->all();
-			}
-			return $this->error($throwable);
-		} finally {
-			$this->connection->release($client ?? null);
-		}
-	}
-
-	/**
-	 * @return bool|array|null
-	 * @throws Exception
-	 */
-	public function one(): null|bool|array
-	{
-		try {
-			$client = $this->connection->getConnection();
-			if (($prepare = $client->prepare($this->sql)) === false) {
-				throw new Exception($client->errorInfo()[1]);
-			}
-			$prepare->execute($this->params);
-			return $prepare->fetch(PDO::FETCH_ASSOC);
-		} catch (Throwable $throwable) {
-			if (str_contains($throwable->getMessage(), 'MySQL server has gone away')) {
-				return $this->one();
-			}
-			return $this->error($throwable);
-		} finally {
-			$this->connection->release($client ?? null);
-		}
-	}
-
-	/**
-	 * @return bool|array|null
-	 * @throws Exception
-	 */
-	public function fetchColumn(): null|bool|array
-	{
-		try {
-			$client = $this->connection->getConnection();
-			if (($prepare = $client->prepare($this->sql)) === false) {
-				throw new Exception($client->errorInfo()[1]);
-			}
-			$prepare->execute($this->params);
-			return $prepare->fetchColumn(PDO::FETCH_ASSOC);
-		} catch (Throwable $throwable) {
-			if (str_contains($throwable->getMessage(), 'MySQL server has gone away')) {
-				return $this->fetchColumn();
-			}
-			return $this->error($throwable);
-		} finally {
-			$this->connection->release($client ?? null);
-		}
-	}
-
-	/**
-	 * @return int|bool
-	 * @throws Exception
-	 */
-	public function rowCount(): int|bool
-	{
-		try {
-			$client = $this->connection->getConnection();
-			if (($prepare = $client->prepare($this->sql)) === false) {
-				throw new Exception($client->errorInfo()[1]);
-			}
-			$prepare->execute($this->params);
-			return $prepare->rowCount();
-		} catch (Throwable $throwable) {
-			if (str_contains($throwable->getMessage(), 'MySQL server has gone away')) {
-				return $this->rowCount();
-			}
-			return $this->error($throwable);
-		} finally {
-			$this->connection->release($client ?? null);
-		}
-	}
-
-
-	/**
-	 * @return int|bool
-	 * @throws Exception
-	 */
-	public function flush(): int|bool
-	{
-		return $this->_execute();
-	}
-
-	/**
-	 * @return bool|int
-	 * @throws ConfigException
-	 * @throws Exception
-	 */
-	private function _execute(): bool|int
-	{
-		try {
-			$client = $this->connection->getTransactionClient();
-			if (($prepare = $client->prepare($this->sql)) === false) {
-				throw new Exception($client->errorInfo()[1]);
-			}
-			if ($prepare->execute($this->params) === false) {
-				throw new Exception($prepare->errorInfo()[1]);
-			}
-			$result = $client->lastInsertId();
-			$prepare->closeCursor();
-
-			if (!$client->inTransaction()) {
-				$this->connection->release($client);
-			}
-			return $result == 0 ? true : (int)$result;
-		} catch (Throwable $throwable) {
-			if (str_contains($throwable->getMessage(), 'MySQL server has gone away')) {
-				return $this->_execute();
-			}
-			return $this->error($throwable);
-		}
-	}
-
-
-	/**
-	 * @param Throwable $throwable
-	 * @return bool
+    /**
+     *
      */
-	private function error(Throwable $throwable): bool
-	{
-        error($this->sql . '.' . json_encode($this->params, JSON_UNESCAPED_UNICODE));
-        error(throwable($throwable), []);
-        return addError($throwable->getMessage(), 'mysql');
-	}
+    const DB_ERROR_MESSAGE = 'The system is busy, please try again later.';
+
+    /** @var Connection */
+    public Connection $connection;
+
+    /** @var ?string */
+    public ?string $sql = '';
+
+    /** @var array */
+    public array $params = [];
 
 
-	/**
-	 * @return int|bool
-	 * @throws Exception
-	 */
-	public function delete(): int|bool
-	{
-		return $this->_execute();
-	}
+    /**
+     * @param array $params
+     * @throws Exception
+     */
+    public function __construct(array $params = [])
+    {
+        parent::__construct();
+        Container::configure($this, $params);
+    }
 
-	/**
-	 * @return int|bool
-	 * @throws Exception
-	 */
-	public function exec(): int|bool
-	{
-		return $this->_execute();
-	}
 
-	/**
-	 * @param array $data
-	 * @return $this
-	 */
-	public function bindValues(array $data = []): static
-	{
-		if (count($data) > 0) {
-			$this->params = array_merge($this->params, $data);
-		}
-		return $this;
-	}
+    /**
+     * @return int|bool
+     * @throws Exception
+     */
+    public function incrOrDecr(): int|bool
+    {
+        return $this->_execute();
+    }
 
-	/**
-	 * @param $sql
-	 * @return $this
-	 * @throws Exception
-	 */
-	public function setSql($sql): static
-	{
-		$this->sql = $sql;
-		return $this;
-	}
+    /**
+     * @return int|bool
+     * @throws Exception
+     */
+    public function save(): int|bool
+    {
+        return $this->_execute();
+    }
+
+
+    /**
+     * @return bool|array
+     * @throws Exception
+     */
+    public function all(): bool|array
+    {
+        try {
+            $client = $this->connection->getConnection();
+            if (($prepare = $client->prepare($this->sql)) === false) {
+                throw new Exception($client->errorInfo()[1]);
+            }
+            $prepare->execute($this->params);
+            return $prepare->fetchAll(PDO::FETCH_ASSOC);
+        } catch (Throwable $throwable) {
+            if (str_contains($throwable->getMessage(), 'MySQL server has gone away')) {
+                return $this->all();
+            }
+            return $this->error($throwable);
+        } finally {
+            $this->connection->release($client ?? null);
+        }
+    }
+
+    /**
+     * @return bool|array|null
+     * @throws Exception
+     */
+    public function one(): null|bool|array
+    {
+        try {
+            $client = $this->connection->getConnection();
+            if (($prepare = $client->prepare($this->sql)) === false) {
+                throw new Exception($client->errorInfo()[1]);
+            }
+            $prepare->execute($this->params);
+            return $prepare->fetch(PDO::FETCH_ASSOC);
+        } catch (Throwable $throwable) {
+            if (str_contains($throwable->getMessage(), 'MySQL server has gone away')) {
+                return $this->one();
+            }
+            return $this->error($throwable);
+        } finally {
+            $this->connection->release($client ?? null);
+        }
+    }
+
+    /**
+     * @return bool|array|null
+     * @throws Exception
+     */
+    public function fetchColumn(): null|bool|array
+    {
+        try {
+            $client = $this->connection->getConnection();
+            if (($prepare = $client->prepare($this->sql)) === false) {
+                throw new Exception($client->errorInfo()[1]);
+            }
+            $prepare->execute($this->params);
+            return $prepare->fetchColumn(PDO::FETCH_ASSOC);
+        } catch (Throwable $throwable) {
+            if (str_contains($throwable->getMessage(), 'MySQL server has gone away')) {
+                return $this->fetchColumn();
+            }
+            return $this->error($throwable);
+        } finally {
+            $this->connection->release($client ?? null);
+        }
+    }
+
+    /**
+     * @return int|bool
+     * @throws Exception
+     */
+    public function rowCount(): int|bool
+    {
+        try {
+            $client = $this->connection->getConnection();
+            if (($prepare = $client->prepare($this->sql)) === false) {
+                throw new Exception($client->errorInfo()[1]);
+            }
+            $prepare->execute($this->params);
+            return $prepare->rowCount();
+        } catch (Throwable $throwable) {
+            if (str_contains($throwable->getMessage(), 'MySQL server has gone away')) {
+                return $this->rowCount();
+            }
+            return $this->error($throwable);
+        } finally {
+            $this->connection->release($client ?? null);
+        }
+    }
+
+
+    /**
+     * @return int|bool
+     * @throws Exception
+     */
+    public function flush(): int|bool
+    {
+        return $this->_execute();
+    }
+
+    /**
+     * @return bool|int
+     * @throws ConfigException
+     * @throws Exception
+     */
+    private function _execute(): bool|int
+    {
+        try {
+            $client = $this->connection->getTransactionClient();
+            if (($prepare = $client->prepare($this->sql)) === false) {
+                throw new Exception($client->errorInfo()[1]);
+            }
+            if ($prepare->execute($this->params) === false) {
+                throw new Exception($prepare->errorInfo()[1]);
+            }
+            $result = $client->lastInsertId();
+            $prepare->closeCursor();
+
+            if (!$client->inTransaction()) {
+                $this->connection->release($client);
+            }
+            return $result == 0 ? true : (int)$result;
+        } catch (Throwable $throwable) {
+            if (str_contains($throwable->getMessage(), 'MySQL server has gone away')) {
+                return $this->_execute();
+            }
+            return $this->error($throwable);
+        }
+    }
+
+
+    /**
+     * @param Throwable $throwable
+     * @return bool
+     */
+    private function error(Throwable $throwable): bool
+    {
+        $message = $this->sql . '.' . json_encode($this->params, JSON_UNESCAPED_UNICODE) . PHP_EOL . jTraceEx($throwable);
+        return addError($message, 'mysql');
+    }
+
+
+    /**
+     * @return int|bool
+     * @throws Exception
+     */
+    public function delete(): int|bool
+    {
+        return $this->_execute();
+    }
+
+    /**
+     * @return int|bool
+     * @throws Exception
+     */
+    public function exec(): int|bool
+    {
+        return $this->_execute();
+    }
+
+    /**
+     * @param array $data
+     * @return $this
+     */
+    public function bindValues(array $data = []): static
+    {
+        if (count($data) > 0) {
+            $this->params = array_merge($this->params, $data);
+        }
+        return $this;
+    }
+
+    /**
+     * @param $sql
+     * @return $this
+     * @throws Exception
+     */
+    public function setSql($sql): static
+    {
+        $this->sql = $sql;
+        return $this;
+    }
 
 }
diff --git a/Db.php b/Db.php
index e97a879..de6c70b 100644
--- a/Db.php
+++ b/Db.php
@@ -227,13 +227,30 @@ class Db implements ISqlBuilder
     }
 
 
+    /**
+     * @param string $table
+     * @param Connection|null $connection
+     * @param string $database
+     * @return array|null
+     * @throws Exception
+     */
+    public static function desc(string $table, ?Connection $connection = null, string $database = 'db'): ?array
+    {
+        $sql = SqlBuilder::builder(new Query())->columns($table);
+
+        $connection = self::getDefaultConnection($connection, $database);
+
+        return $connection->createCommand($sql)->all();
+    }
+
+
     /**
      * @param null|Connection $connection
-     * @param string $name
+     * @param string $database
      * @return mixed
      * @throws Exception
      */
-    public static function getDefaultConnection(?Connection $connection = null, string $name = 'db'): Connection
+    public static function getDefaultConnection(?Connection $connection = null, string $database = 'db'): Connection
     {
         if ($connection instanceof Connection) {
             return $connection;
@@ -242,7 +259,7 @@ class Db implements ISqlBuilder
         if (empty($databases) || !is_array($databases)) {
             throw new Exception('Please configure the database link.');
         }
-        return Kiri::service()->get($databases[$name]);
+        return Kiri::service()->get($databases[$database]);
     }