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I am trying to follow along with the article: Distinguishing Barcode Scanners from the Keyboard in WinForms . However I have the following ...

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Mar 11, 2010 · So when first letter is entered, start a timer during which the complete barcode will be scanned to the textbox. Once timer is off, you can process ...

I ll start with a couple of simple examples demonstrating the use of EXEC . Suppose that you have a separate Orders table for each year, and the table is named OrdersYYYY, where YYYY represents the year . For reasons beyond your control, you can t create a partitioned view across these tables . You need to write code that queries the table representing the current year . For the code samples to actually work, first run the following code to create an Orders table for the current year in the tempdb database for test purposes:

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The next listing that we examine is the ApplicationMenu class. It is responsible for caching the list of available options for our home page. The DiagnosticApp servlet calls the getMenu method each time the menu is required. We have omitted the code that makes this component a singleton from this listing. It is identical to the code that we use in the ComponentLocator class to implement the Singleton pattern. We discuss the ComponentLocator code in section 6.6.3. The ApplicationMenu also requires an administrative interface. We use this interface to reload the menu data from menu.xml. The class registers itself with a JMS Queue in the registerListener method. If menu.xml is updated to include an additional function, we need only put a message on the JMS queue. As a subscriber, the ApplicationMenu class will reload the menu data.

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USE tempdb; DECLARE @year AS CHAR(4) = CAST(YEAR(CURRENT_TIMESTAMP) AS CHAR(4)); EXEC('IF OBJECT_ID(''dbo.Orders' + @year + ''', ''U'') IS NOT NULL DROP TABLE dbo.Orders' + @year + '; CREATE TABLE dbo.Orders' + @year + '(orderid INT PRIMARY KEY);');

If the current year is 2009, the code that is constructed and executed dynamically looks like this:

IF OBJECT_ID('dbo.Orders2009', 'U') IS NOT NULL DROP TABLE dbo.Orders2009; CREATE TABLE dbo.Orders2009(orderid INT PRIMARY KEY);

public class ApplicationMenu implements MessageListener { ... private void loadMenu() { try { SAXBuilder sBuilder = new SAXBuilder(); menuJDOM = sBuilder.build(new File("config/mydomain/applications/book/menu.xml"));

Similarly, to query the table representing the current year you would use the following code:

DECLARE @year AS CHAR(4) = CAST(YEAR(CURRENT_TIMESTAMP) AS CHAR(4)); EXEC('SELECT orderid FROM dbo.Orders' + @year + ';');

I constructed the code within the parentheses of the EXEC command, but note that only a string variable, a string literal, or a concatenation of string variables and/or string literals are allowed within the parentheses . You re not allowed to invoke functions or use a CASE expression . For example, the following code, which attempts to invoke the CAST function within the parentheses, fails:

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EXEC('SELECT orderid FROM dbo.Orders' + CAST(YEAR(CURRENT_TIMESTAMP) AS CHAR(4)) + ';');

} catch (Exception ex) { System.out.println("Error in loadMenu" + ex.getMessage()); } } public Document getMenu() { return menuJDOM; } private void registerListener() { try { Context ctx = new InitialContext(); tcf = (TopicConnectionFactory) ctx.lookup("TopicConnectionFactory"); topic = (Topic) ctx.lookup("MenuRefresh"); tConn = tcf.createTopicConnection();

This code produces the following error:

Msg 102, Level 15, State 1, Line 2 Incorrect syntax near 'CAST'.

So it s a good practice to always construct the code in a variable, where such limitations don t apply, and then provide the variable name as input to the EXEC command, as shown here:

ts = tConn.createTopicSession( false, Session.AUTO_ACKNOWLEDGE ); tSub = ts.createSubscriber( topic ); tSub.setMessageListener( this ); tConn.start(); } catch (Exception ex) { System.out.println("Error in registerListener" + ex.getMessage()); }

DECLARE @sql AS VARCHAR(500) = 'SELECT orderid FROM dbo.Orders' + CAST(YEAR(CURRENT_TIMESTAMP) AS CHAR(4)) + ';'; EXEC(@sql);

As I mentioned earlier, EXEC(<string>) has no interface . Its only input is a character string with the code that you want to invoke . Remember that a dynamic batch has no access to local variables defined in the calling batch . For example, the following code attempts to access a variable defined in the calling batch and fails:

USE InsideTSQL2008; DECLARE @lastname AS NVARCHAR(40) = N'Davis'; DECLARE @sql AS NVARCHAR(500) = N'SELECT empid, firstname, lastname FROM HR.Employees WHERE lastname = @lastname;'; EXEC(@sql);

} /** * Reload the menu data when a message is * received from the JMS Queue. */ public void onMessage (Message ms) { loadMenu(); Message in } JMS Queue

This code produces the following error:

Msg 137, Level 15, State 2, Line 3 Must declare the scalar variable "@lastname".

Using EXEC, if you want to access the variable, you have to concatenate its contents to the code string you re constructing dynamically:

DECLARE @lastname AS NVARCHAR(40) = N'Davis'; DECLARE @sql AS NVARCHAR(500) = N'SELECT empid, firstname, lastname FROM HR.Employees WHERE lastname = ' + QUOTENAME(@lastname, N'''') + N';'; EXEC(@sql);

... }