改名

Database/Mysql/Columns.php

@@ -189,6 +189,22 @@ class Columns extends Component
 		return $this->_primary[$this->table] ?? null;
 	}
 
+	/**
+	 * @return array|null|string
+	 *
+	 * @throws Exception
+	 */
+	public function getFirstPrimary()
+	{
+		if (isset($this->_auto_increment[$this->table])) {
+			return $this->_auto_increment[$this->table];
+		}
+		if (isset($this->_primary[$this->table])) {
+			return current($this->_primary[$this->table]);
+		}
+		return null;
+	}
+
 	/**
 	 * @param $name
 	 * @param null $index