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Let s achieve the same effect using a callback function: $(document).ready(function() { $('img').click(function(){ $('img').animate( {left: 600}, 'slow', function(){ $('img').fadeTo('slow',0) } ); }); }); In the jQuery code that makes the image grow in size while scrolling to the right, we can see that in the event-handling function of the click event, we write the code to animate the image from left to right and set it to stop at a distance of 600px from the left boundary of the browser window and also set its width and height to become twice its original value on reaching the right end. This makes the image slowly scroll to the right, with a gradual increase in its width and height. At the beginning, the image may appear as shown in Figure 3-38. When the image is clicked, it starts moving to the right, and on reaching the right edge it appears as shown in Figure 3-40.

try { conn = getConnection(); stmt = conn.createStatement(); rs = stmt.executeQuery(query); rsMetaData = rs.getMetaData(); if (rsMetaData == null) { // ResultSetMetaData is not supported by db vendor // or there was a problem in getting the ResultSetMetaData. // In general, it is a good idea to check if ResultSetMetaData // is null or not. ... } else { // ResultSetMetaData is supported by db vendor int numberOfColumns = rsMetaData.getColumnCount(); } } catch(SQLException e) { // handle exception } finally { // close resources such as ResultSet, Statement, and Connection } If you do not know exactly the table structure (the schema) of the ResultSet, you can obtain it via a ResultSetMetaData object. The ResultSetMetaData interface answers the following questions: How many columns are in a result set (ResultSet object) What is the name of a given column What is the name of a table for a given column Are the column names case sensitive What is the data type of a specific column What is the maximum character size of a column Can you search on a given column Is a given column readable/writable

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// prepare a statement to insert binary data String sql = "INSERT INTO mysql_all_table (col_binarystream) VALUES( )"; PreparedStatement pstmt = conn.prepareStatement(sql); // create some binary data String myData = "some string data ..."; byte[] binaryData = myData.getBytes(); // set value for the prepared statement pstmt.setBytes(1, binaryData); // insert the data pstmt.executeUpdate(); // insert was successful } catch (SQLException e) { // insert failed // handle the exception } finally { // close database/JDBC resources such as // ResultSet(s), Statement(s), and Connection(s) }

This example retrieves binary data from a table: ResultSet rs = null; Statement stmt = null; Connection conn = null; try { // get a Connection object conn = getConnection(); // select records from the table stmt = conn.createStatement(); String query = "SELECT col_binarystream FROM mysql_all_table"; rs = stmt.executeQuery(query); while (rs.next()) { // get data from the binary column byte[] bytes = rs.getBytes(1); // process bytes } } catch (SQLException e) { // retrieving binary data failed // handle the exception } finally { // close database/JDBC resources such as // ResultSet(s), Statement(s), and Connection(s) }

Figure 3-40. The image becomes twice its original width and height on reaching the right side. The statement $('img').fadeTo('slow',0); will make the image fade out slowly, as its opacity is set to 0. Similarly, the statement $('img').fadeTo('slow',1); will make the image fade in that is, become slowly visible again, as its opacity is set to 1.

ResultSetMetaData is a Java class, which provides information about the ResultSet and implements the java.sql.ResultSetMetaData interface. The column name, column type, and so forth are provided by the ResultSetMetaData object. Database vendors provide different classes for implementing the ResultSetMetaData interface.

The javasql package provides the ability to send multiple updates (such as updating records or creating new records) to the database server for execution as a batch The StatementaddBatch() method enables you to accomplish this task, which might improve the performance of the entire transaction You can reduce the amount of time it takes to perform repetitive inserts and updates if you batch them using the Statement object s addBatch() method The signature of addBatch() is as follows: public void addBatch(String sql) throws SQLException This adds the given SQL command to the current list of commands for this Statement object The commands in this list can be executed as a batch by calling the method executeBatch Its parameter is sql; typically this is a static SQL INSERT or UPDATE statement This throws SQLException if a database access error occurs Both the Oracle and MySQL drivers support the Statement.

You want to know which key the user pressed while entering data in an input field; that way it can be used for validation checks, etc.

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