what is connection pooling with example?

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what is connection pooling with example?..

Answer / rakesh

Connection pooling means that connections are reused rather
than created each time a connection is requested. To
facilitate connection reuse, a memory cache of database
connections, called a connection pool, is maintained by a
connection pooling module as a layer on top of any standard
JDBC driver product.

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what is connection pooling with example?..

Answer / dinesh

Connection pooling whic h use to Reuse the Connection
resource.To Avoid wastage of connection resources,So you
don't need to have new connection ,Instead of creating new
connection,You can use the connection from connection pool
resource
A database driver may contain a connection pool as part of
its services, through its implementation of the
javax.sql.DataSource interface. DataSource objects are used
with JNDI.

With example:
import java.sql.*;
import java.util.*;
import org.w3c.dom.*;
import DBConnectionManager;

public class XSQL {
static DBBroker pool = DBBroker.getInstance();
// <---- Pool code!

public static Element executeQuery(
String connectionName,
String statementId,
String statementText,
Document factory
)
throws SQLException
{
Connection connection = null;
DBConnection db = null;
// <---- Pool code!
try {
db = pool.getConnection(connectionName);
// <---- Pool code!
connection = db.getConnection();
// <---- Pool code!
Statement statement = connection.createStatement();
ResultSet resultSet =
statement.executeQuery(statementText);
ResultSetMetaData metaData = resultSet.getMetaData();
int columnCount = metaData.getColumnCount();

Element rowSet = factory.createElement("xsql:rowset");
rowSet.setAttribute("id", statementId);

for (int i = 0; resultSet.next(); i++) {
Element row = factory.createElement("xsql:row");
row.setAttribute("sequence", String.valueOf(i + 1));
rowSet.appendChild(row);

for (int j = 0; j < columnCount; j++) {
String value = resultSet.getString(j + 1);

Element element = factory.createElement(
metaData.getColumnLabel(j + 1).toLowerCase()
);
row.appendChild(element);

if (value != null) {
element.appendChild(
factory.createTextNode(value)
);
}
}
}

resultSet.close();
statement.close();

return rowSet;
} catch (SQLException e) {
throw(new SQLException(statementText));
} finally {
if (connection != null) {
pool.releaseConnection(db); // <---- Pool code!
}
}
}

}
If u r not understand the code,If ur the beginners that
prespective to
http://publib.boulder.ibm.com/infocenter/iseries/v5r3/index.jsp?topic=/rzaha/poolnods.htm

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what is connection pooling with example?..

Answer / venkat

if we are using connection pooling , we can interact
database only once ,then we can place some area, then we
can reuse .

example

if we take in hibernate Ex: c3po,proxy.

these are setting to the configuration file.

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