Access the database and mysql database

Access the database and mysql database
Improve system performance: Starting from Data Access

1. The using statement has two functions:

① As a keyword, using can import namespaces

② As a C # statement, using can release the memory resources occupied by objects.

 

2. Since using can release objects, is it possible to use using to limit all objects?

This is not the case because:

① The IDisable interface must be implemented for all objects that can be released by using.

② Even if all the IDisable interfaces are implemented, there is no need to use using all.

We only limit the using of objects that have an important impact on the system, while other objects can be handed over to the Garbage Collector for processing.

 

3. common attributes of the SqlParameter class