-
- 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 theDriverManager
facility, aDataSource
object is the preferred means of getting a connection. An object that implements theDataSource
interface will typically be registered with a naming service based on the JavaTM Naming and Directory (JNDI) API.The
DataSource
interface is implemented by a driver vendor. There are three types of implementations:- Basic implementation -- produces a standard
Connection
object - Connection pooling implementation -- produces a
Connection
object that will automatically participate in connection pooling. This implementation works with a middle-tier connection pooling manager. - 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 theDriverManager
. Rather, aDataSource
object is retrieved though a lookup operation and then used to create aConnection
object. With a basic implementation, the connection obtained through aDataSource
object is identical to a connection obtained through theDriverManager
facility.- Since:
- 1.4
-
-
Method Summary
Methods Modifier and Type Method and Description Connection
getConnection()
Attempts to establish a connection with the data source that thisDataSource
object represents.Connection
getConnection(String username, String password)
Attempts to establish a connection with the data source that thisDataSource
object represents.-
Methods inherited from interface javax.sql.CommonDataSource
getLoginTimeout, getLogWriter, getParentLogger, 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 madepassword
- the user's password- Returns:
- a connection to the data source
- Throws:
SQLException
- if a database access error occurs- Since:
- 1.4
-
-
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