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Java Standard Edition (SE)

DataSource


compact2, compact3
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™ 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.

    An implementation of DataSource must include a public no-arg constructor.

    Since:
    1.4
    • 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
        SQLTimeoutException - when the driver has determined that the timeout value specified by the setLoginTimeout method has been exceeded and has at least tried to cancel the current database connection attempt
      • 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
        SQLTimeoutException - when the driver has determined that the timeout value specified by the setLoginTimeout method has been exceeded and has at least tried to cancel the current database connection attempt
        Since:
        1.4


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