Comment typos, duplicate code removal and avoid unnecessary fetch of column key_ from the database.

[d4mian]

Commit 862affa: comment typos fixes.

Commit d4c46d8: remove duplicate code.

Commit 39dc6cd: key_ column is being fetch from the database while it is set in the WHERE condition (using the value stored in the variable key). Therefore the value stored in the variable key can be used, avoiding the unnecessary fetch of column key_ from the database.

[arunthirupathi]

Can you give more context on the key_ field change ?

The other 2 commits look fine.

[d4mian]

Both methods, put and delete, receive the key as a parameter and use it as part of the SQL query where condition (used to fetch the key_ and version_) querying for those records/rows whose key_ column match the given key value.

In the select SQL query the key_ column is requested to match the key value given as parameter to the method, and therefore the fetched rows will have in the key_ column the value of given key (due to where condition).
The key value given as parameter could be used instead of fetching the key_ column from the database.

[arunthirupathi]

Looked at the code, seems fine to me, merging the request.