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Oracle Fusion Middleware Java API Reference for Oracle Extension SDK 11g Release 2 (11.1.2.0.0) E17493-01 |
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java.lang.Object oracle.javatools.db.execute.ConnectionWrapper
public class ConnectionWrapper
Class to wrap a process that uses a Database connection and can execute that process while recovering from a closed connection (by reconnecting). This is automatically used by the StatementWrapper and QueryWrapper so does not need to be used in addition to them.
Example usage 1: Retrieving the user name for the Connection
final Database db = ... try { final ConnectionWrapper wrapper = new ConnectionWrapper( db, "Query username from connection metadata" ); // description should be translated final String userName = wrapper.call( wrapper.new SQLCallableExample usage 2: Setting the autocommit flag on the connection() { public String call() throws SQLException { return getConnection().getMetaData().getUserName(); } } ); } catch( SQLException sqe ) { // process the exception }
final Database db = ... try { final ConnectionWrapper wrapper = new ConnectionWrapper( db, "Set the auto commit flag on the Connection" ); // description should be translated final String userName = wrapper.run( wrapper.new SQLRunnable() { public String run() throws SQLException { getConnection().setAutoCommit( true ); } } ); } catch( SQLException sqe ) { // process the exception }
Nested Class Summary | |
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class |
ConnectionWrapper.SQLCallable<T>
Callable class that can throw a SQLException from its call method. |
class |
ConnectionWrapper.SQLRunnable
Runnable class that can throw a SQLException from its run method. |
Constructor Summary | |
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ConnectionWrapper(Database db,
java.lang.String desc)
Creates a ConnectionWrapper using the given Database. |
Method Summary | ||
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call(ConnectionWrapper.SQLCallable<T> c)
Calls the given SQLCallable. |
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void |
run(ConnectionWrapper.SQLRunnable r)
Runs the given SQLRunnable. |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
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public ConnectionWrapper(Database db, java.lang.String desc)
db
- the database to use the Connection fromdesc
- a translatable description of the nature of the process being
executed. This will be wrapped into any DBException thrown if the process
fails to indicate to the user what failed.Method Detail |
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public void run(ConnectionWrapper.SQLRunnable r) throws DBException
r
- the runnable to run as a unit of work on the Connection
DBException
- if an error with the database occurspublic <T> T call(ConnectionWrapper.SQLCallable<T> c) throws DBException
c
- the callable to run as a unit of work on the Connection
DBException
- if an error with the database occurs
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Oracle Fusion Middleware Java API Reference for Oracle Extension SDK 11g Release 2 (11.1.2.0.0) E17493-01 |
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