SQL Server 2000 Stored Procedure & XML Programming in VS .NET

Paint Data Matrix 2d barcode in VS .NET SQL Server 2000 Stored Procedure & XML Programming

SQL Server 2000 Stored Procedure & XML Programming
Data Matrix ECC200 Reader In .NET Framework
Using Barcode Control SDK for .NET framework Control to generate, create, read, scan barcode image in VS .NET applications.
Data Matrix Generator In .NET Framework
Using Barcode creation for .NET framework Control to generate, create Data Matrix ECC200 image in .NET framework applications.
--if it does not exist Begin -- insert new EqType in the database Insert EqType (EqType) Values (@chvEqType) -- get id of record that you've just inserted Select @intEqTypeId = @@identity --insert equipment Insert Equipment (Make, Model, EqTypeId) Values (@chvMake, @chvModel, @intEqTypeId) End Select @intEquipmentId = @@identity -- return id to the caller return @intEquipmentId
Scanning ECC200 In Visual Studio .NET
Using Barcode scanner for VS .NET Control to read, scan read, scan image in Visual Studio .NET applications.
Bar Code Creation In VS .NET
Using Barcode creator for VS .NET Control to generate, create barcode image in VS .NET applications.
There are a few items that could be changed in this stored procedure, but the importance of this example is to illustrate a use of the Else statement. One item that could be improved upon is the process of investigating the EqType table with the Exists keyword. Its use here is similar to its use in the Where clause. It tests for the presence of the records in the subquery:
Barcode Scanner In .NET
Using Barcode reader for Visual Studio .NET Control to read, scan read, scan image in .NET framework applications.
ECC200 Creator In Visual C#.NET
Using Barcode creator for VS .NET Control to generate, create DataMatrix image in .NET framework applications.
If [NOT] Exists(subquery) {Transact-SQL_statement | statement_block} [else {Transact-SQL_statement | statement_block}]
Data Matrix ECC200 Printer In VS .NET
Using Barcode encoder for ASP.NET Control to generate, create DataMatrix image in ASP.NET applications.
Paint Data Matrix In VB.NET
Using Barcode maker for Visual Studio .NET Control to generate, create Data Matrix ECC200 image in VS .NET applications.
The stored procedure prInsertEquipment can be modified to use the Exists keyword:
Generate Bar Code In .NET Framework
Using Barcode creation for .NET Control to generate, create barcode image in .NET applications.
Draw Code-128 In Visual Studio .NET
Using Barcode generator for Visual Studio .NET Control to generate, create Code 128A image in VS .NET applications.
If . . . Exists (Select EqTypeId From EqType Where EqType = @chvEqType) . . .
Encode Bar Code In Visual Studio .NET
Using Barcode creator for Visual Studio .NET Control to generate, create barcode image in Visual Studio .NET applications.
Standard 2 Of 5 Encoder In VS .NET
Using Barcode creator for Visual Studio .NET Control to generate, create 2 of 5 Standard image in .NET framework applications.
Naturally, if you use the Not operator, the encapsulated statement will be executed if the subquery does not return records:
GS1-128 Drawer In VB.NET
Using Barcode maker for .NET framework Control to generate, create EAN / UCC - 13 image in VS .NET applications.
Draw UPC A In Visual C#
Using Barcode printer for Visual Studio .NET Control to generate, create GTIN - 12 image in .NET framework applications.
Alter Procedure prInsertEquipment_2 -- store values in equipment table. -- return identifier of the record to the caller. ( @chvMake varchar(50), @chvModel varchar(50), @chvEqType varchar(30)
Decoding GS1 - 12 In Java
Using Barcode recognizer for Java Control to read, scan read, scan image in Java applications.
Printing EAN13 In Java
Using Barcode generator for Android Control to generate, create European Article Number 13 image in Android applications.
C h a p t e r 4 : B a s i c Tr a n s a c t - S Q L P r o g r a m m i n g C o n s t r u c t s
Encode Code 128 Code Set B In VS .NET
Using Barcode generator for Reporting Service Control to generate, create ANSI/AIM Code 128 image in Reporting Service applications.
Recognize Code39 In C#
Using Barcode decoder for Visual Studio .NET Control to read, scan read, scan image in Visual Studio .NET applications.
) As declare
Bar Code Drawer In Java
Using Barcode drawer for Android Control to generate, create barcode image in Android applications.
Read ECC200 In Java
Using Barcode recognizer for Java Control to read, scan read, scan image in Java applications.
@intEqTypeId int, @intEquipmentId int
-- does such eqType already exists in the database If Not Exists (Select EqTypeId From EqType Where EqType = @chvEqType) --if it does not exist Begin -- insert new EqType in the database Insert EqType (EqType) Values (@chvEqType) -- get id of record that you've just inserted Select @intEqTypeId = @@identity End else -- read Id of EqType Select @intEqTypeId = EqTypeId From EqType Where EqType = @chvEqType --insert equipment Insert Equipment (Make, Model, EqTypeId) Values (@chvMake, @chvModel, @intEqTypeId) Select @intEquipmentId = @@identity -- return id to the caller Return @intEquipmentId
Both If and Else statements can be nested:
Create Procedure prInsertEquipment_3 -- store values in equipment table. -- return identifier of the record to the caller. ( @chvMake varchar(50), @chvModel varchar(50), @chvEqType varchar(30), @intEquipmentId int ) As declare @intEqTypeId int, @ErrorCode int
SQL Server 2000 Stored Procedure & XML Programming
-- does such eqType already exists in the database If Not Exists (Select EqTypeId From EqType Where EqType = @chvEqType) --if it does not exist Begin -- insert new EqType in the database Insert EqType (EqType) Values (@chvEqType) -- get id of record that you've just inserted Select @intEqTypeId = @@identity, @ErrorCode = @@Error If @ErrorCode <> 0 begin Select 'Unable to insert Equipment Type. Error: ', @ErrorCode Return 1 End End Else Begin -- read Id of EqType Select @intEqTypeId = EqTypeId From EqType Where EqType = @chvEqType Select @ErrorCode = @@Error If @ErrorCode <> 0 begin Select 'Unable to get Id of Equipment Type. Error: ', @ErrorCode Return 2 End End --insert equipment Insert Equipment (Make, Model, EqTypeId) Values (@chvMake, @chvModel, @intEqTypeId) -- return id to the caller Select @intEquipmentId = @@identity, @ErrorCode = @@Error If @ErrorCode <> 0 Begin
C h a p t e r 4 : B a s i c Tr a n s a c t - S Q L P r o g r a m m i n g C o n s t r u c t s
Select 'Unable to insert Equipment. Error: ', @ErrorCode Return 3 End -- return id to the caller Select @intEquipmentId = @@identity Return @intEquipmentId
There is no limit to the number of levels. However, this capability should not be abused. The presence of too many levels is a sure sign that a more in-depth study should be made concerning code design.
Looping: The While Statement
Transact-SQL contains only one statement that allows looping:
While Boolean_expression {sql_statement | statement_block} [Break] {sql_statement | statement_block} [Continue]
If the value of the Boolean expression is True (1), the server will execute one or more encapsulated Transact-SQL statement(s). From inside the block of statements, this execution can be controlled with the Break and Continue statements. The server will interrupt the looping when it encounters a Break statement. When the server encounters a Continue statement, it will ignore the rest of the statements and restart the loop.
Copyright © OnBarcode.com . All rights reserved.