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CHAPTER 13 JDBC and Java Data Objects
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catch (SQLException e ) { Systemerrprintln("Data display error" + e); Systemexit(5); } finally { dBclose(); }
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Here s what is happening in this example After a connection is made to the database, a query is defined in the second try block that retrieves the students first name and last name from the Students table of the Registration database The students names are returned in the resultset Before the program can copy these names, the virtual pointer must be moved from the row above the first row of the resultset to the first row This is done by calling the next() method We can t assume that any data was returned by the DBMS because maybe no data matches the data requested by the SQL query Therefore, we must test the results returned by the next() method If a false is returned, no row exists Therefore, the No data returned message is displayed and the program terminates However, if a true value is returned, the dowhile loop is entered The dowhile loop is where the getString() method is called to copy values from the first and second columns of the resultset to the variables firstName and lastName The values of these variables are then concatenated and assigned to the printRow variable, which is then displayed on the screen The next() method is called again to move the virtual cursor to the next row in the resultset The value returned by the next() method is evaluated by the conditional statement in the dowhile loop If a true is returned, the program executes the statements within the dowhile loop again; otherwise, the program exits the dowhile loop and calls the close() method, which closes the Statement object You learned how the close() method works previously in this chapter
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Positioning the Virtual Cursor
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Six methods are defined by the ResultSet object: first(), last(), previous(), absolute(), relative(), and getRow() These methods are used to move the virtual cursor in the resultset The first() method moves the virtual cursor to the first row in the resultset, and the last() method positions the virtual cursor at the last row The previous() method moves the virtual cursor to the previous row The absolute() method enables you to specify the number of the row where you want the virtual
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cursor positioned You specify the row number as an integer that you pass to the absolute() method The relative() method moves the virtual cursor a specified number of rows from the current row You pass the relative() method an integer that represents the number of rows to move You use a positive (optional) or negative sign to indicate the direction in which to move the virtual cursor For example, a value of -6 moves the virtual cursor back six rows from the current row, whereas a value of 3 moves the virtual cursor forward three rows You can always determine the number of the current row by calling the getRow() method The getRow() method returns an integer, which is the number of the current row In order to position the virtual cursor in the resultset, you must create a scrollable resultset You do this by passing the createStatement() method one of three constants: TYPE_FORWARD_ONLY, TYPE_SCROLL_INSENSITIVE, or TYPE_ SCROLL_SENSITIVE The TYPE_FORWARD_ONLY constant restricts the virtual cursor to downward movement, which is the default setting This means you won t be able to move the virtual cursor to previous rows The TYPE_SCROLL_INSENSITIVE and TYPE_SCROLL_SENSITIVE constants enable the virtual cursor to move in both directions The TYPE_ SCROLL_INSENSITIVE constant makes the resultset insensitive to changes made by another program to data in the table whose rows are reflected in the resultset The TYPE_SCROLL_SENSITIVE constant makes the resultset sensitive to those changes Suppose that another program updates, deletes, or changes data in the Students table while your program is copying the student names from the resultset to variables in your program If you created the resultset as insensitive, it will not automatically be updated to reflect those changes However, if you create the resultset as sensitive, those changes will be reflected in the resultset A word of caution: The values of variables that have already been copied from columns in the resultset are not updated automatically Let s say that you ve copied names from the first row to variables and then moved the virtual cursor to the next row Then, while you re on the next row, the names in the first row are updated in the Students table The resultset will be updated with those changes if you created a sensitive resultset; however, your variables will not be updated because you already copied those values from the row The following example shows how to reposition the virtual cursor in the resultset This example creates an insensitive resultset and then uses various methods to move the virtual cursor up and down within the resultset
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