barcode generator in vb.net codeproject NOTE in Software

Create Code 39 in Software NOTE

NOTE
USS Code 39 Decoder In None
Using Barcode Control SDK for Software Control to generate, create, read, scan barcode image in Software applications.
Draw Code 39 Full ASCII In None
Using Barcode generator for Software Control to generate, create Code39 image in Software applications.
Some SQL implementations provide initialization or system parameters that alter the behavior of cursors. For example, Oracle provides the CURSOR_SHARING initialization parameter that specifies which kind of SQL statements can share the same cursors. As always, you should consult the documentation for your particular implementation.
Scan Code39 In None
Using Barcode reader for Software Control to read, scan read, scan image in Software applications.
Drawing ANSI/AIM Code 39 In C#.NET
Using Barcode encoder for .NET framework Control to generate, create Code-39 image in VS .NET applications.
Cursor Scrollability
ANSI/AIM Code 39 Printer In Visual Studio .NET
Using Barcode generation for ASP.NET Control to generate, create Code 3 of 9 image in ASP.NET applications.
Code 3 Of 9 Creation In .NET Framework
Using Barcode printer for .NET Control to generate, create Code 3/9 image in .NET framework applications.
The next optional element in the DECLARE CURSOR statement that we ll look at is cursor scrollability, as shown in the following syntax: [ SCROLL | NO SCROLL ] Scrollability is directly tied to the FETCH statement and the options that the FETCH statement can use to retrieve data. If the SCROLL option is specified, the FETCH statement can be defined with one of several options that extend its ability to move through the query results and return specific rows. The SCROLL option allows the FETCH statement to skip around through the query results as needed to retrieve the specific row. If NO SCROLL is specified in the cursor declaration, the FETCH statement cannot make use of the additional scrolling options and can retrieve only the next available row from the query results. If neither option is specified, NO SCROLL is assumed. For more information about the FETCH options, see the Retrieve Data from a Cursor section later in this chapter.
Code39 Creation In VB.NET
Using Barcode creator for .NET framework Control to generate, create USS Code 39 image in .NET framework applications.
Create EAN-13 In None
Using Barcode printer for Software Control to generate, create EAN-13 Supplement 5 image in Software applications.
SQL: A Beginner s Guide
UPC Symbol Creator In None
Using Barcode maker for Software Control to generate, create UPC Symbol image in Software applications.
Encode Barcode In None
Using Barcode maker for Software Control to generate, create bar code image in Software applications.
Cursor Holdability
Creating Bar Code In None
Using Barcode creator for Software Control to generate, create barcode image in Software applications.
DataMatrix Encoder In None
Using Barcode creation for Software Control to generate, create DataMatrix image in Software applications.
The next item that we ll look at in the DECLARE CURSOR syntax is related to cursor holdability, as shown in the following syntax: [ WITH HOLD | WITHOUT HOLD ] Cursor holdability refers to a characteristic in cursors that is concerned with whether a cursor is automatically closed when the transaction in which the cursor was opened is committed. A transaction is an atomic unit of work. This means that all statements within the transaction must succeed or none of them can have any effect. If some statements within a transaction are executed and then one statement fails, all executed statements are rolled back and the database remains unchanged. (Transactions are discussed in more detail in 16.) SQL provides two options that allow you to define cursor holdability: WITH HOLD and WITHOUT HOLD. If you specify WITH HOLD, your cursor will remain open after you commit the transaction, until you explicitly close it. If you specify WITHOUT HOLD, your cursor will be automatically closed when the transaction is committed. If neither option is specified, WITHOUT HOLD is assumed and your cursor is automatically closed.
Leitcode Maker In None
Using Barcode drawer for Software Control to generate, create Leitcode image in Software applications.
European Article Number 13 Generation In .NET Framework
Using Barcode generation for Visual Studio .NET Control to generate, create UPC - 13 image in VS .NET applications.
NOTE
Paint Barcode In Visual Basic .NET
Using Barcode generation for .NET Control to generate, create barcode image in .NET framework applications.
Painting Bar Code In Java
Using Barcode creator for Eclipse BIRT Control to generate, create bar code image in Eclipse BIRT applications.
Even if your cursor is defined as a WITHOUT HOLD cursor whether explicitly or by default it is still generally considered good practice to explicitly close your cursor when it is no longer needed. This can free up system resources, and it helps to ensure that your code is clearly self-documenting. In SQL Server, a cursor must be deallocated after it is closed in order to free up all of its resources.
Generate Barcode In None
Using Barcode maker for Word Control to generate, create bar code image in Office Word applications.
Encode UCC - 12 In None
Using Barcode maker for Excel Control to generate, create UCC.EAN - 128 image in Microsoft Excel applications.
The advantage of defining a holdable cursor (one that is defined with the WITH HOLD option) is that there might be times after a transaction is committed when you want your cursor to persist in order to maintain its position within the query results returned by that cursor. Closing a cursor and reopening it can often make it difficult to restore conditions, including the cursor s position in the query results, to exactly what they were when you first closed the cursor.
Painting Code 128A In .NET Framework
Using Barcode drawer for .NET framework Control to generate, create Code 128B image in VS .NET applications.
DataMatrix Drawer In None
Using Barcode generator for Office Excel Control to generate, create ECC200 image in Excel applications.
Cursor Returnability
Cursor returnability, the next option we ll look at in the cursor declaration definition, uses the following syntax: [ WITH RETURN | WITHOUT RETURN ] The returnability option applies only to cursors that are opened in an SQL-invoked procedure. As you ll recall from 13, an SQL-invoked procedure is a type of routine that is invoked by using the CALL statement. The CALL statement is an SQL statement that invokes procedures and allows you to pass parameter values to those procedures. If the cursor is not opened within a procedure, the returnability option has no effect. As the syntax shows, SQL supports two returnability options: WITH RETURN and WITHOUT RETURN. If you specify WITH RETURN, the cursor is considered a result
15:
Copyright © OnBarcode.com . All rights reserved.