Run without a database connection

[raxod502]

Run without a database connection

[lighttiger2505]

In order to get the most out of sqls, it is ideal to start sqls with the correct configuration to get information about the DB schema. However, it is not desirable to lose all functions or get unnecessary error messages just because you cannot connect to the DB. This was a lack of consideration on my part.

I will fix it so that some of the functions of sqls can be used even if the DB cannot be connected.

[lighttiger2505]

64b3884

With this change, sqls now works with keyword completion even without a DB connection.

Also, there is still room for improvement in the keyword completion, and we plan to improve it in the future.

[raxod502]

Yay, thanks so much!