Oracle C++ Call Interface Programmer's Guide

const string poolUserName = "SCOTT";
const string poolPassword = "TIGER";
const string connectString = "";
const string username = "SCOTT";
const string password = "TIGER";
unsigned int maxConn = 5;
unsigned int minConn = 3;
unsigned int incrConn = 2;
Connecting to a Database
ConnectionPool *connPool = env->createConnectionPool(poolUserName, poolPassword,
connectString, minConn, maxConn, incrConn);
See Also:
■ Appendix A, "OCCI Demonstration Programs" and the code
example occipool.cpp that demonstrates how to use the
connection pool interface of OCCI
You can also configure all these attributes dynamically. This lets you design an
application that has the flexibility of reading the current load (number of open
connections and number of busy connections) and tune these attributes
appropriately. In addition, you can use the setTimeOut method to time out the
connections that are idle for more than the specified time. The DBMS terminates
idle connections periodically so as to maintain an optimum number of open
connections.
Each connection pool has a data structure (pool handle) associated with it. This pool
handle stores the pool parameters. There is no restriction that one environment
must have only one connection pool. There can be multiple connection pools in a
single OCCI environment, and these can connect to the same or different databases.
This is useful for applications requiring load balancing. However, note that since a
pool handle requires memory, multiple connection pools consume more memory.
Proxy Connections
If you authorize the connection pool user to act as a proxy for other connections,
then no password is required to log in database users who use one of the
connections in the connection pool to act as a proxy on their behalf.
A proxy connection can be created by using either of the following methods:
ConnectionPool->createProxyConnection(const string &name,
Connection::ProxyType proxyType =
Connection::PROXY_DEFAULT);
Relational Programming 2-5