qr barcode generator vb.net PART VI in Software

Make QR-Code in Software PART VI

PART VI
Scan QR-Code In None
Using Barcode Control SDK for Software Control to generate, create, read, scan barcode image in Software applications.
Paint QR Code In None
Using Barcode encoder for Software Control to generate, create QR image in Software applications.
Part VI:
Decoding QR Code 2d Barcode In None
Using Barcode recognizer for Software Control to read, scan read, scan image in Software applications.
Creating Denso QR Bar Code In Visual C#
Using Barcode generation for .NET Control to generate, create QR image in VS .NET applications.
SQL Today and Tomorrow
Encode QR Code JIS X 0510 In VS .NET
Using Barcode generator for ASP.NET Control to generate, create QR Code ISO/IEC18004 image in ASP.NET applications.
QR-Code Drawer In Visual Studio .NET
Using Barcode creation for Visual Studio .NET Control to generate, create QR image in .NET applications.
/* Check order total for a customer */ create proc chk_tot @c_num integer as /* one input parameter */
Print Denso QR Bar Code In VB.NET
Using Barcode generator for .NET framework Control to generate, create QR Code ISO/IEC18004 image in Visual Studio .NET applications.
Create EAN128 In None
Using Barcode encoder for Software Control to generate, create GS1-128 image in Software applications.
/* Declare two local variables */ declare @tot_ord money, @msg_text varchar(30) begin /* Calculate total orders for customer */ select @tot_ord = sum(amount) from orders where cust = @c_num /* Load appropriate message, based on total */ if tot_ord < 30000.00 select @msg_text = "high order total" else select @msg_text = "low order total" /* Do other processing for message text */ . . . end
Code 128C Maker In None
Using Barcode creation for Software Control to generate, create Code 128C image in Software applications.
Encode EAN-13 In None
Using Barcode drawer for Software Control to generate, create EAN13 image in Software applications.
FIGURE 20-4
Encoding Code-39 In None
Using Barcode drawer for Software Control to generate, create Code-39 image in Software applications.
Universal Product Code Version A Creator In None
Using Barcode drawer for Software Control to generate, create UPC Symbol image in Software applications.
Using local variables in Transact-SQL
Create Interleaved 2 Of 5 In None
Using Barcode encoder for Software Control to generate, create ANSI/AIM I-2/5 image in Software applications.
EAN13 Generation In VS .NET
Using Barcode creation for .NET Control to generate, create UPC - 13 image in .NET applications.
The DECLARE statement declares the local variables for this procedure. In this case, there are two variables: one with the MONEY data type and one VARCHAR. In Transact-SQL, the SELECT statement assumes the additional function of assigning values to variables. A simple form of this use of SELECT is the assignment of the message text:
Create Bar Code In VS .NET
Using Barcode generator for Reporting Service Control to generate, create bar code image in Reporting Service applications.
Barcode Generator In VS .NET
Using Barcode creation for ASP.NET Control to generate, create barcode image in ASP.NET applications.
SELECT @MSG_TEXT = "high order total";
Painting DataMatrix In Visual C#
Using Barcode generator for .NET framework Control to generate, create DataMatrix image in VS .NET applications.
Data Matrix 2d Barcode Creator In Objective-C
Using Barcode maker for iPad Control to generate, create Data Matrix image in iPad applications.
The assignment of the total order amount at the beginning of the procedure body is a more complex example, where the SELECT is used both to assign a value and as the introducer of the query that generates the value to be assigned. Figure 20-5 shows the Informix SPL version of the same stored procedure. There are several differences from the Transact-SQL version: Local variables are declared using the DEFINE statement. This example shows only a very limited subset of the options that are available. Variable names are ordinary SQL identifiers; there is no special first character. A specialized SELECT INTO statement is used within SPL to assign the results of a singleton SELECT statement into a local variable. The LET statement provides simple assignment of variable values.
Bar Code Generation In Objective-C
Using Barcode printer for iPhone Control to generate, create barcode image in iPhone applications.
Recognizing Code 128 Code Set C In Java
Using Barcode recognizer for Java Control to read, scan read, scan image in Java applications.
20:
Database Processing and Stored Procedural SQL
/* Check order total for a customer */ create procedure chk_tot (c_num integer) /* Declare two local variables */ define tot_ord numeric(16,2); define msg_text varchar(30); /* Calculate total orders for requested customer */ select sum(amount) into tot_ord from orders where cust = c_num; /* Load appropriate message, based on total */ if tot_ord < 30000.00 let msg_text = "high order total" else let msg_text = "low order total" /* Do other processing for message text */ . . . end procedure;
FIGURE 20-5
Using local variables in Informix SPL
Figure 20-6 shows the Oracle PL/SQL version of the same stored procedure. Again, there are several differences to note from the Transact-SQL and Informix SPL examples: The SELECT...INTO statement has the same form as the Informix procedure; it is used to select values from a single-row query directly into local variables. The assignment statements use Pascal-style (:=) notation instead of a separate LET statement. Local variables within a stored procedure can be used as a source of data within SQL expressions anywhere that a constant may appear. The current value of the variable is used in the execution of the statement. In addition, local variables may be destinations for data derived from SQL expressions or queries, as shown in the preceding examples.
Statement Blocks
In all but the very simplest stored procedures, it is often necessary to group a sequence of SQL statements together so that they will be treated as if they were a single statement. For example, in the IF THEN ELSE structure typically used to control the flow of execution within a stored procedure, most stored procedure dialects expect a single statement following the THEN keyword. If a procedure needs to perform a sequence of several SQL statements when the tested condition is true, it must group the statements together as a statement block, and this block will appear after THEN.
PART VI
Part VI:
SQL Today and Tomorrow
/* Check order total for a customer */
create procedure chk_tot (c_num in number) as /* Declare two local variables */ tot_ord number(16,2); msg_text varchar(30); begin /* Calculate total orders for requested customer */ select sum(amount) into tot_ord from orders where cust = c_num; /* Load appropriate message, based on total */ if tot_ord < 30000.00 then msg_text := 'high order total'; else msg_text := 'low order total'; end if; /* Do other processing for message text */ . . . end;
FIGURE 20-6
Copyright © OnBarcode.com . All rights reserved.