barcode generator vb.net Advanced Stored Procedure Programming in Software

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Advanced Stored Procedure Programming
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You can also generate it in a stored procedure:
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Create Procedure prInsertLocation @Location varchar(50), @CompanyId int, @PrimaryContactName varchar(60), @Address varchar(30) , @City varchar(30) , @ProvinceId varchar(3) , @PostalCode varchar(10), @Country varchar(20) , @Phone varchar(15), @Fax varchar(15), @LocationGUID uniqueidentifier OUTPUT AS Set @LocationGUID = NewId()
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Insert Into Location (Location_id, Location, CompanyId, PrimaryContactName, Address, City, ProvinceId, PostalCode, Country, Phone, Fax) values (@LocationGUID, @Location, @CompanyId, @PrimaryContactName, @Address, @City, @ProvinceId, @PostalCode, @Country, @Phone, @Fax) Return @@ERROR
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The stored procedure will also return a GUID to the caller.
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A WHILE LOOP WITH MIN OR MAX FUNCTIONS
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It is possible to iterate through a table or recordset using a While statement with the aggregate function, which returns extreme values: MIN and MAX. Take a look at the following batch:
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-- get first value Select @Value = MIN(Value) From aTable
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SQL Server 2000 Stored Procedure Programming
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-- loop While @Value is not null Begin -- do something instead of just displaying a value Select @Value value -- get next value Select @Value = MIN(Value) From aTable And Value > @Value End
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The first Select statement with the Min() function obtains a first value from the set (table):
Select @Value = MIN(Value) From aTable
The next value is obtained in a loop as a minimal value bigger then the previous one:
Select @Value = MIN(Value) From aTable And Value > @Value
If no records qualify as members of the set, an aggregate function will return NULL. We can then use NULL as a criterion to exit a loop:
While @Value is not null
To demonstrate this method, let s rewrite prSpaceUsedByTables, which displays the space used by each user-defined table in the current database:
Create Procedure prSpaceUsedByTables_4 -- loop through table names in current database -- display info about amount of space used by each table -- demonstration of while loop
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Advanced Stored Procedure Programming
As Set nocount on Declare @TableName sysname -- get first table name Select @TableName = Min(name) From sysobjects Where xtype = 'U' While @TableName is not null Begin -- display space used Exec sp_spaceused -- get next table Select @TableName = Min(name) From sysobjects Where xtype = 'U' And name > @TableName End Return 0 @TableName
This was just an academic example. Naturally, the proper solution will include a temporary table to collect all results and display them at the end in one recordset. Note that I am not talking about a temporary table like we have used for looping using a While statement in 4. You can step backward through the recordset if you use the MAX function and if you compare the old record and the remainder of the set using the < operator.
TIP: This method can be a quick solution for problems that require iteration. However, solutions based on set operations usually provide superior performance.
SQL Server 2000 Stored Procedure Programming
PROPERTY MANAGEMENT
One of the features that I have always wanted to see in SQL Server is the capability to add descriptions to database objects. Microsoft Access already has that feature. Naturally, you could be even more ambitious. It would be perfect on some projects to be able to store additional attributes such as field formats, input masks, captions, and the location and size of screen fields in the database as well. The more things you manage centrally, the fewer maintenance and deployment issues you will have later in production. SQL Server 2000 introduces extended properties. Users can define extended properties, store them in the database, and associate them with database objects. Each database object can have any number of extended properties. An extended property can store a sql_variant value up to 7,500 bytes long. SQL Server 2000 introduces three stored procedures and one function for managing extended properties. sp_addextendedproperty, sp_updateextendedproperty, and sp_dropextendedproperty are used to create, change, or delete extended properties. They all have very unusual syntax. We will examine this syntax in sp_addextendedproperty:
sp_addextendedproperty [@name =]{'property_name'} [, [@value =]{'extended_property_value'} [, [@level0type =]{'level0_object_type'} , [@level0name =]{'level0_object_name'} [, [@level1type =]{'level1_object_type'} , [@level1name =]{'level1_object_name'} [, [@level2type =]{'level2_object_type'} , [@level2name =]{'level2_object_name'} ] ] ] ]
Here, @name and @value are the name and value of the extended property. Other parameters define the name and type of the object
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