JAVA DATABASE CONNECTIVITY

What is persistence ?

The process of storing data to permanent place and retrieving data from permanent place is called as persistence and such data is called persistence data.

What are persistent operations ?

Add, remove, read and modify operations on persistence data are called as persistence operations and the logic used for it is called as persistent logic,

What is persistent store ?

The place where data will be stored permanently is called as persistent store. As the data became permanent we can use it at any moment through programming. Two types of persistent store - File and Database.

Drawbacks / Limitations of File system ?

• Files are not secured because it is managed of operating system.
• Files cannot store large amount of data.
• Files cannot provide query language.

How Front-end communicate with Back-end applications ?

• Vendor specific libraries
• ODBC
• JDBC

Vendor Specific Libraries

Database Vendor provide library, which is used by front-end to communicate with back-end (database).

Disadvantage -

• Vendor specific libraries are written in C language. Theses libraries are platform dependent.
• Functions of library changes from one database to another.
• It is database dependent.