CODEWITHSUNDEEP
javajakarta-eenetbeansjdbcdatasource
saplingPro
saplingPro

Reputation: 21329

what does Context,DataSource depict?

There are certain things that i don't understand when i am writing a program to query into the database.

In the following 2 lines of code :

Context context = new InitialContext();
DataSource ds = (DataSource)context.lookup("java:comp/env/jdbc/MyDatasource");

What does the first instruction do ? What is context and what is initial context ? I have read the doc but don't understand it.

Then what is a DataSource ?

While working with netbeans I have to make a new file of category JDBCConnectionPool :

enter image description here

What is a JDBC Connection Pool and what is a JDBC Resource ?

And what does Steady Pool Size and Max Pool Size mean ? What is a pool size ? enter image description here

Upvotes: 3

Views: 1143

Answers (1)

subodh
subodh

Reputation: 6158

What is context and what is initial context ?

Context: represents a naming context, which consists of a set of name-to-object bindings. It contains methods for examining and updating these bindings. source

InitialContext: Is a class, or you can say the starting context for performing naming operations, and this class is implementing the Context interface and provide the implementation. mustRead

DataSource ds = (DataSource)context.lookup("java:comp/env/jdbc/MyDatasource");

what is a DataSource:

The above line of code is showing that,You are retrieving a DataSource object by looking up a JNDI location.

JDBCConnectionPool

JDBCConnection Pooling is conceptually same as any other form of object pooling such as String object pooling. Database connection creation are always expensive because of the overhead of establishing a network connection and initializing a database connection session in the back end database source

JDBC Resource:

read here

Very good example of steady pooling readHere

Upvotes: 2

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