Mark Grand's Patterns in Java, Volume 2 PDF

By Mark Grand

"This is the simplest ebook on styles because the Gang of Four's layout styles. The booklet manages to be a source for 3 of an important tendencies in expert programming: styles, Java, and UML." -Larry O'Brien, Founding Editor, software program improvement, on styles in Java, quantity 1 deciding on up the place he left off in his bestselling styles in Java, quantity 1, Mark Grand hands you with 50 new and reusable Java patterns-some on hand for the 1st time-that assist you create extra dependent and reusable designs. As with quantity 1, each one trend is documented in UML and, the place applicable, a code instance or an instance within the center Java API is supplied.

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Show() ; PJ. setViewportView(dataTable); //from JTableJDBC public void exitWindow(int i) { CJ. closeConnection(dbConnect, dbStatement ) ; System. exit (i) ; } CallableJDBC The data members for CallableJDBC are similar to PreparedJDBC, except that we have a CallableStatement object instead of a PreparedStatement. The main() m e t h o d is simple and obvious. In the constructor (lines 17-28), there are a couple of subtle differences. First, since the query is slightly different, the text for the input field is changed in line 19.

Run tests to d e t e r m i n e if y o u r d a t a b a s e benefits f r o m PreparedStatements. java to include timing i n f o r m a t i o n a n d to execute a very long q u e r y m a n y times (with different p a r a m e t e r s ) . One possible e x a m p l e is to g e n e r a t e a list of c u s t o m e r s who have never r e n t e d a given title. T h e n m o d i f y the p r o g r a m to use Statements i n s t e a d of PreparedStatements. D e t e r m i n e which is faster. ~ Chapter 3: Querying the Database m 3.

The ResultSet interface also includes the m e t h o d s first() and last(), which move the cursor to either the first or last row, respectively. Additionally, the interface contains the m e t h o d getRow(), which r e t u r n s the row n u m b e r . This provides an easy m e c h a n i s m to d e t e r m i n e the n u m b e r of rows in the ResultSet, rs. last () ; numberRows = rs. 0 ResultSet objects replaces the use of vectors within our JTable example. The p r o g r a m c o n s i s t s of two new parts: JDBC2TableModel, which e x t e n d s JDBCTableModel, and TableModelJDBC2, which e x t e n d s TableModelJDBC.

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