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try { DatabaseMetaData dbmd = conn.getMetaData(); if (dbmd == null) { // database metadata not supported return false; } if (dbmd.supportsBatchUpdates()) { // batching is supported return true; } else { // batching is not supported return false; } } catch (Exception e) { // handle the exception return false; } } Making Batch Updates Next I ll provide an example that will perform batch updates. This example will be accomplished in several steps: Step 1: Setting up the database Step 2: Developing a sample program for batch updating Step 3: Running the sample program Step 4: Verifying the database results Step 5: Discussing the solution Step 1: Setting up the Database Let s create a simple table, which will perform batch updates. $ mysql --user=root --password=root Welcome to the MySQL monitor. Commands end with ; or \g. Your MySQL connection id is 4240 to server version: 4.0.18-nt mysql> use octopus; Database changed mysql> create table batch_table( -> id varchar(5) not null, -> name varchar(10) not null, -> primary key(id) -> );

11-10. How Do You Determine Whether a SQL Warning Occurred (Using Statement Objects)

You want one piece of text to be replaced by another; the first piece is slowly made invisible while the other appears gradually.

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Some database operations can cause a warning that is not handled by an exception. You must check for these warnings explicitly. An example of such a warning is a data truncation error during a read operation. You should check for warnings in three places: on a Connection object, a Statement object, and a ResultSet object. A SQL Warning (in JDBC defined by the java.sql.SQLWarning class) is an exception that provides information about database access warnings. Warnings are silently chained to the object whose method caused it to be reported. The following example demonstrates how to check for a warning on a Statement object: Connection SQLWarning try { // get conn = conn = null; warning = null; a Connection object getConnection();

Query OK, 0 rows affected (0.05 sec) mysql> describe batch_table; +-------+-------------+------+-----+---------+-------+ | Field | Type | Null | Key | Default | Extra | +-------+-------------+------+-----+---------+-------+ | id | varchar(5) | | PRI | | | | name | varchar(10) | | | | | +-------+-------------+------+-----+---------+-------+ 2 rows in set (0.01 sec) Step 2: Developing a Sample Program for Batch Updating Here is the solution for batch updates. For discussion purposes, I have added line numbers. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 import import import import import import java.sql.Connection; java.sql.Statement; java.sql.ResultSet; java.sql.SQLException; java.sql.BatchUpdateException; jcb.util.DatabaseUtil;

// Create a statement Statement stmt = conn.createStatement(); // Use the statement...such as selecting some rows from a table // Get warnings on Statement object warning = stmt.getWarnings(); while (warning != null) { // Process statement warnings... String message = warning.getMessage(); String sqlState = warning.getSQLState(); int errorCode = warning.getErrorCode(); warning = warning.getNextWarning(); } } catch (SQLException e) { // handle exception... } finally { // close database/JDBC resources such as // ResultSet(s), Statement(s), and Connection(s) }

In this solution, we will be applying CSS styles directly to the elements using css() instead of picking them from the style sheet (see Recipe 3-6 for details of css()). Let s assume we have an HTML file that has two paragraph elements that are distinguished from each other by assigning them the IDs message1 and message2, respectively. <body> <p id="message1">jQuery is an open source project</p> <p id="message2">Manipulating DOM using jQuery</p> </body> Here is the jQuery code for applying the sliding effect: $(document).ready(function() { $('p#message1').css({'border': '2px solid', 'text-align': 'center','fontweight':'bold'}).hide(); $('p#message2').css({'backgroundColor': '#f00','color':'#fff','text-align': 'center', 'font-weight':'bold'}).click( function(){ $(this).slideUp('slow'); $('p#message1').slideDown('slow'); } ); });

11-11. How Do You Set the Number of Rows to Prefetch (Using Statement Objects)

public class TestBatchUpdate { public static Connection getConnection() throws Exception { String driver = "org.gjt.mm.mysql.Driver"; String url = "jdbc:mysql://localhost/octopus"; String username = "root"; String password = "root"; Class.forName(driver); // load MySQL driver return DriverManager.getConnection(url, username, password); } public static void main(String args[]) { ResultSet rs = null; Statement stmt = null; Connection conn = null; try { conn = getConnection(); stmt = conn.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE, ResultSet.CONCUR_UPDATABLE); conn.setAutoCommit(false); stmt.addBatch("INSERT INTO batch_table(id, name) "+ "VALUES('11', 'Alex')"); stmt.addBatch("INSERT INTO batch_table(id, name) "+ "VALUES('22', 'Mary')"); stmt.addBatch("INSERT INTO batch_table(id, name) "+ "VALUES('33', 'Bob')");

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