Add json Data Type & solve database name issues

[amrfayad]

This error appeared to me :
[PDOException]
SQLSTATE[42000]: Syntax error or access violation: 1064 You have an error in your SQL syntax; check the manual that corresponds to your M
ySQL server version for the right syntax to use near 'desc WHERE Key_name != "PRIMARY"' at line 1

And The solution is to change line 27 in DBExporter to Be

return $pdo->query('SHOW INDEX FROM ' . $this->database . '.' . $table . ' WHERE Key_name != "PRIMARY"');

second issues Their is new data type in mysql is json DataType : and
This lines added in DbMigrations.php

case 'json' :
$method = 'json';
break;