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The following _demoRefreshRow() method first obtains a scroll-insensitive, updatable result set, and prints the result set s type and concurrency type: private static void _demoRefreshRow( Connection conn, String stmtString ) throws SQLException, IOException { ResultSet rset = null; PreparedStatement pstmt = null; try { pstmt = conn.prepareStatement( stmtString, ResultSet.TYPE_SCROLL_INSENSITIVE, ResultSet.CONCUR_UPDATABLE); System.out.print( "For statement: " + stmtString + ", " ); //JDBCUtil.printRsetTypeAndConcurrencyType( pstmt ); rset = (ResultSet) pstmt.executeQuery(); JDBCUtil.printRsetTypeAndConcurrencyType( rset ); Next, we set the fetch size to 7 and invoke the next() method to move to row number 1, which becomes our current row: rset.setFetchSize(7); rset.next(); // moves to first row We then invoke the InputUtil.waitTillUserHitsEnter() method (see the section A Utility to Pause in a Java Program in 1 for a description of this method), which simply waits until the user presses Enter. We do this so we can go to another session as SCOTT and delete the first row (our current row) from t1. We also update the second row s value to something different. This is to verify that a delete operation indeed is not visible to our result set, whereas updates are visible. The next statement starts a SQL trace, which helps us understand how Oracle implements refetching. We then refetch the row using the refreshRow() method. We print out the current row value and end the program after the finally clause: InputUtil.waitTillUserHitsEnter( "Perform delete/update and " ); //start trace Benchmark.startTrace( conn ); rset.refreshRow(); System.out.println( "Row number 1 has a value = " + rset.getInt( 1 ) ); rset.next(); // moves to second row System.out.println( "Row number 2 has a value = " + rset.getInt( 1 ) ); } finally { // release the JDBC resources in the finally clause. JDBCUtil.close( rset ); JDBCUtil.close( pstmt ); } } } // end of program

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Represents a character encoding The encoding for the UTF-8 Unicode format The encoding for the ASCII 7-bit character set The encoding for the UTF-16 Unicode format The encoding for the UTF-32 Unicode format Fetches an encoding by name Encodes a string to bytes Decodes a sequence of bytes Decodes a sequence of bytes

When we run the program, we see the following output: >java DemoRefreshRow URL:jdbc:oracle:thin:@(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(PORT=1521) (HOST=rmenon-lap))(CONNECT_DATA=(SID=ora10g))) For statement: select x from t1 order by x, Result set category (using ResultSet API): Scroll insensitive, Updatable Perform delete/update and Press Enter to continue.. During this wait, in a different session we delete the first row, update the second row to a value of 222, and commit the transaction: scott@ORA10G> delete from t1 where x = 1; 1 row deleted scott@ORA10G> update t1 set x= 222 where x = 2; 1 row updated scott@ORA10G> commit; Commit complete We then come back to our running program and press Enter to see the following output: Row number 1 has a value = 1 Row number 2 has a value = 222 As shown, the result set still displayed the deleted row value that contained a value of 1.

This is the data that gets passed from the client to the server. Any client-side script can be executed to generate this value before the callback is executed. If an atomic value will not provide for your functionality, pass a delimited string and split it when it gets to the server. You can pass a string expression as a value (i.e., a client-side variable or ControlName.value), and it will be evaluated on the client, as it s baked into the output stream as client-side script. This is the name of the function that gets executed when the callback completes. This argument is typed as a string, but acts more like a function pointer, pointing to the callback function. The callback function accepts two arguments. The first is the return value from the serverside processing, and the second is the context string that was passed as second argument with the original call. This can be used to establish where the event occurred. For example, you could bind a GridView, and have each row provide a link that would fire a callback. In order to establish which row the click originated on, you could pass the ID of the row as the context. When the call returned to the client, this information is passed back as the second argument of your callback function. The name of the client-side function that should be executed if an error occurs. This argument is optional. (There is another argument list that accepts only four values.)

Another common requirement is to convert binary data to and from the standard 64-character string-encoded representation of binary data used in XML, e-mail, and other formats. You can do this using System.Convert.FromBase64String and System.Convert.ToBase64String.