postgresql Connect to PostgreSQL from Java Connecting with javax.sql.DataSource using a connection pool
Example
It is common to use javax.sql.DataSource with JNDI in application server containers, where you register a data source under a name and look it up whenever you need a connection.
This is code that demonstrates how data sources work:
/**
* Create a data source with connection pool for PostgreSQL connections
* @param url the JDBC URL to connect to. Must start with "jdbc:postgresql:"
* @param user the username for the connection
* @param password the password for the connection
* @return a data source with the correct properties set
*/
private static javax.sql.DataSource createDataSource(String url, String user, String password)
{
/* use a data source with connection pooling */
org.postgresql.ds.PGPoolingDataSource ds = new org.postgresql.ds.PGPoolingDataSource();
ds.setUrl(url);
ds.setUser(user);
ds.setPassword(password);
/* the connection pool will have 10 to 20 connections */
ds.setInitialConnections(10);
ds.setMaxConnections(20);
/* use SSL connections without checking server certificate */
ds.setSslMode("require");
ds.setSslfactory("org.postgresql.ssl.NonValidatingFactory");
return ds;
}
Once you have created a data source by calling this function, you would use it like this:
/* get a connection from the connection pool */
java.sql.Connection conn = ds.getConnection();
/* do some work */
/* hand the connection back to the pool - it will not be closed */
conn.close();
