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javax.sql
Interface DataSource

All Superinterfaces:
CommonDataSource , Wrapper 
public interface DataSource
extends CommonDataSource, Wrapper

A factory for connections to the physical data source that this DataSource object represents. An alternative to the DriverManager facility, a DataSource object is the preferred means of getting a connection. An object that implements the DataSource interface will typically be registered with a naming service based on the Java TM Naming and Directory (JNDI) API.

The DataSource interface is implemented by a driver vendor. There are three types of implementations:

  1. Basic implementation -- produces a standard Connection object
  2. Connection pooling implementation -- produces a Connection object that will automatically participate in connection pooling. This implementation works with a middle-tier connection pooling manager.
  3. Distributed transaction implementation -- produces a Connection object that may be used for distributed transactions and almost always participates in connection pooling. This implementation works with a middle-tier transaction manager and almost always with a connection pooling manager.

A DataSource object has properties that can be modified when necessary. For example, if the data source is moved to a different server, the property for the server can be changed. The benefit is that because the data source's properties can be changed, any code accessing that data source does not need to be changed.

A driver that is accessed via a DataSource object does not register itself with the DriverManager. Rather, a DataSource object is retrieved though a lookup operation and then used to create a Connection object. With a basic implementation, the connection obtained through a DataSource object is identical to a connection obtained through the DriverManager facility.

Since:
1.4

Method Summary
<T extends BaseQuery
<T> T
createQueryObject ( Class <T> ifc)
          Creates a concrete implementation of a Query interface using the JDBC drivers QueryObjectGenerator implementation.
<T extends BaseQuery
T
createQueryObject ( Class <T> ifc, DataSource  ds)
          Creates a concrete implementation of a Query interface using the JDBC drivers QueryObjectGenerator implementation.
  Connection getConnection ()
          Attempts to establish a connection with the data source that this DataSource object represents.
  Connection getConnection ( String  username, String  password)
          Attempts to establish a connection with the data source that this DataSource object represents.
 
Methods inherited from interface javax.sql. CommonDataSource
getLoginTimeout , getLogWriter , getQueryObjectGenerator , setLoginTimeout , setLogWriter
 
Methods inherited from interface java.sql. Wrapper
isWrapperFor , unwrap
 

Method Detail

getConnection


Connection getConnection()
                         throws SQLException

Attempts to establish a connection with the data source that this DataSource object represents.

Returns:
a connection to the data source
Throws:
SQLException - if a database access error occurs

getConnection


Connection getConnection(String username,
                         String password)
                         throws SQLException

Attempts to establish a connection with the data source that this DataSource object represents.

Parameters:
username - the database user on whose behalf the connection is being made
password - the user's password
Returns:
a connection to the data source
Throws:
SQLException - if a database access error occurs
Since:
1.4

createQueryObject


<T extends BaseQuery> T 
<T> T createQueryObject(Class<T> ifc)
 throws SQLException
Creates a concrete implementation of a Query interface using the JDBC drivers QueryObjectGenerator implementation. If the JDBC driver does not provide its own QueryObjectGenerator, the QueryObjectGenerator provided with J2SE will be used.

If the JDBC driver does not provide its own QueryObjectGenerator, the QueryObjectGenerator provided with Java SE will be used.

Parameters:
ifc - The Query interface that will be created
Returns:
A concrete implementation of a Query interface
Throws:
SQLException - if a database access error occurs.
Since:
1.6

createQueryObject 


 
<T extends BaseQuery> T createQueryObject ( Class<T> ifc,
 DataSource ds)
 throws SQLException
Creates a concrete implementation of a Query interface using the JDBC drivers QueryObjectGenerator implementation.

* If the JDBC driver does not provide its own QueryObjectGenerator, the QueryObjectGenerator provided with Java SE will be used.

This method is primarly for developers of Wrappers to JDBC implementations. Application developers should use createQueryObject(Class<T> ifc).

Parameters:
ifc - The Query interface that will be created
ds - The DataSource that will be used when invoking methods that access the data source. The QueryObjectGenerator implementation will use this DataSource without any unwrapping or modications to create connections to the data source.
Returns:
An concrete implementation of a Query interface
Throws:
SQLException - if a database access error occurs.
Since:
1.6