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To accomplish this, the jQuery code would be modified as shown here: $(document).ready(function() { $('.studgroup').css( {'background-image':"url(plus.jpg)", 'background-repeat':"no-repeat", 'background-position':"left"} ); $('table tbody tr').hide(); $('table tbody').find('.studgroup').parent().show(); $('tbody tr').hover( function(){ $(this).find('.studgroup').css( {'background-image':"url(minus.jpg)", 'background-repeat':"no-repeat", 'background-position':"left"} ); var tr=$('table tbody tr'); var rindex=$(this).parent().children().index(this); for(var i=rindex;i<=rindex+5;i++) { $(tr[i]).show(); } $(this).addClass('hover'); }, function(){ $(this).find('.studgroup').css( {'background-image':"url(plus.jpg)", 'background-repeat':"no-repeat", 'background-position':"left"} ); $('table tbody tr').hide(); $('table tbody').find('.studgroup').parent().show(); $(this).removeClass('hover'); } ); }); Here, in the rows that display the range of roll numbers (td element spanning three columns and assigned the class name .studgroup), we display a plus icon that is assumed to exist in the image file plus.jpg. We use the background-repeat and background-position properties in the .css() method to make the icon appear only once, on the left side of the row. We then hide all the rows that are nested inside the tbody element of the table. That is, we hide all the student records (except the table headings), as we want to display them only when the plus icon of the associated row is hovered over. Then we display the three rows that display the range of roll numbers (rows that are assigned the class name studgroup and that have plus icon next to them). When any row is hovered over, its plus icon is replaced with a minus icon using the .css() method, and the background-repeat and background-position properties are set to no-repeat and left, respectively, to make the minus icon appear only once, on left side of the row. Also, in the hover event handler, we retrieve all the rows of the table and store them in the variable tr (now tr is an array containing all the rows of the table), and we find out the index number of the row that is hovered over

The following code shows how to check for warnings using the Connection object: import java.sql.Connection; import java.sql.SQLException; import java.sql.SQLWarning; import jcb.util.DatabaseUtil; ... Connection conn = null; try { conn = <get-a-database-connection>; // // do some operations with the Connection object // // // get warnings on Connection object // SQLWarning warning = conn.getWarnings(); while (warning != null) { // // handle connection warning // String message = warning.getMessage(); String sqlState = warning.getSQLState(); int errorCode = warning.getErrorCode(); warning = warning.getNextWarning(); } }

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import java.io.PrintWriter; import java.io.IOException; import java.sql.*; import javax.servlet.*; import javax.servlet.http.*; import jcb.util.DatabaseUtil; import jcb.db.VeryBasicConnectionManager; public class GetForeignKeys extends HttpServlet { public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { Connection conn = null; ResultSet foreignKeys = null; try { String dbVendor = request.getParameter("vendor").trim(); String outputFormat = request.getParameter("format").trim(); String table = request.getParameter("table").trim(); conn = VeryBasicConnectionManager.getConnection(dbVendor); if (dbVendor.equals("mysql")) { String catalog = request.getParameter("catalog").trim(); foreignKeys = getForeignKeys(conn, catalog, // catalog, null, // schema table); } else if (dbVendor.equals("oracle")) { String schema = request.getParameter("schema").trim(); foreignKeys = getForeignKeys(conn, null, // catalog, schema, // schema table); } else { printError(response, "unknown db vendor"); return; } if (outputFormat.equals("xml")) { printXML(response, foreignKeys); } else { printHTML(response, foreignKeys); }

catch (SQLException e) { // exception happened while getting the warnings; // you may handle it or ignore it } finally { DatabaseUtil.close(conn); }

and store it in a variable rindex. Then, with the help of a for loop we display the next five rows; that is, the rows underlying the row heading (of the class name studgroup) are displayed. Finally, for the hover event we apply the properties defined in the style rule hover to highlight the hovered-over row. When the mouse pointer is moved away from the hovered-over row, its minus icon is replaced with a plus icon using the .css() method, and the background-repeat and background-position properties are set to no-repeat and left, respectively, to make the plus icon appear only once, on left side of the row. We then hide all of the rows of the table except the rows that show the range of roll numbers, along with a plus icon (this is what we want when the mouse pointer is moved away from the hovered-over row). Finally, we remove the properties defined in the .hover style rule to make the row appear as it was initially when mouse pointer is moved away. On execution of the preceding jQuery code, we find three rows Roll 101-105, Roll 106-110, and Roll 111-115 that designate the group of records underneath them. Also, we will find that on left of each row is a minus icon indicating that the rows are currently collapsed, as shown in Figure 7-26.

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