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boolean relative(int row) boolean isBeforeFirst() boolean isAfterLast() boolean isFirst() boolean isLast() Table 13-2
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JDBC 20 Navigation Methods for Scrollable Result Sets
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To use scrollable result sets, the Statement object must be created with parameters that indicate the specific capabilities requested For this reason, a new form of the ConnectioncreateStatement() method exists public Statement createStatement (int resultSetType, int resultSetConcurrency) throws SQLException where resultSetType is the type of scrolling to be used and resultSetConcurrency indicates whether the result set can be updated Both parameters take their values from constants in ResultSet, as shown in Table 13-3
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TYPE_FORWARD_ONLY TYPE_SCROLL_INSENSITIVE
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JDBC 10-style navigation in which the cursor starts at the first row and can only move forward All cursor positioning methods are enabled; the result set doesn t reflect changes made by others in the underlying table All cursor positioning methods are enabled; the result set reflects changes made by others in the underlying table The result set won t be updatable Rows and be added and deleted, and columns can be updated
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TYPE_SCROLL_SENSITIVE
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CONCUR_READ_ONLY CONCUR_UPDATABLE
Table 13-3
Constants in ResultSet that Can Be Used to Describe Scrollable Result Sets
The following JSP page is an example of using a scrollable result set to display only the last page of a potentially lengthy query
<%@ page import="javasql*" %> <%@ page import="javatext*" %> <%! public static final DecimalFormat PRICE_FMT = new DecimalFormat("$#,###00"); %> <HTML> <HEAD> <TITLE>Scrollable Example</TITLE> </HEAD> <BODY> <IMG SRC="images/lyric_notepng" BORDER=0><P> <HR COLOR="#000000"> <% // Get driver name and database URL from configuration // parameters stored in webxml String DRIVER = applicationgetInitParameter("jdbcdriver"); String URL = applicationgetInitParameter("jdbcurl");
13:
Database Access
// Load the driver ClassforName(DRIVER); Connection con = null; Statement stmt = null; ResultSet rs = null; try { // Connect to the database con = DriverManagergetConnection(URL); // Open a statement that supports scrollable result sets stmt = concreateStatement( ResultSetTYPE_SCROLL_INSENSITIVE, ResultSetCONCUR_READ_ONLY); // Execute the query rs = stmtexecuteQuery( " SELECT itemcode, price, description" + " FROM products" + " WHERE prodtype = 'IN'" + " ORDER BY description" ); // Calculate number of rows rslast(); int nRows = rsgetRow(); // Back up ten rows rsrelative(-10); // Now print last page of result set %> <H3>
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Musical Instruments - Items <%= rsgetRow() + 1 %> through <%= nRows %> </H3> <TABLE BORDER=1 CELLPADDING=3 CELLSPACING=0> <TR><TH>Item</TH><TH>Price</TH><TH>Description</TH></TR> <% while (rsnext()) { String itemcode = rsgetString(1); double price = rsgetLong(2) / 1000; String description = rsgetString(3); %> <TR> <TD><%= itemcode %></TD> <TD ALIGN="RIGHT"><%= PRICE_FMTformat(price) %></TD> <TD><%= description %></TD> </TR> <% } } finally { if (rs != null) { rsclose(); rs = null; } if (stmt != null) { stmtclose(); stmt = null; } if (con != null) { conclose(); con = null; } } %> </TABLE> </BODY> </HTML>
The Statement object is opened so the result sets it creates are scrollable, but not updatable Having these properties, the ResultSet can be asked how many rows it contains, which wasn t possible in JDBC 10 By positioning the cursor at the last row and issuing a relative(-10) method call, the last ten rows in the result set can be isolated and printed Figure 13-12 shows the results
Updatable Result Sets
With JDBC 20, updating columns in a result set is possible, both to add new rows and to delete existing rows In each of these cases, the corresponding rows in the underlying table are then also updated
13:
Database Access
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Figure 13-12
Showing the last page of a lengthy query using a scrollable result set
For a result set to be updated, it must have been produced by a Statement object created with a concurrency type of ResultSetCONCUR_UPDATABLE JDBC 20 provides updateXXX() methods, where XXX is the JDBC data type, similar to the existing getXXX() methods These methods take a column number or column name parameter, and a value parameter, as illustrated in the following example:
double mySalary = rsgetDouble( SALARY ); mySalary *= 20; rsupdateDouble( SALARY , mySalary); rsupdateString( HOME_PHONE , unlisted); rsupdateRow();
The updated values aren t automatically replicated in the underlying table until updateRow() is called The updates can be canceled explicitly with ResultSet cancelRowUpdates() if updateRow() hasn t yet been called or implicitly if a cursor movement method is called before updateRow()
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