barcode generator vb.net download 12: Stored Procedures for Web Search Engines in .NET

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12: Stored Procedures for Web Search Engines
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@LastRec int = 25, @RowCount int = null output AS /* test: declare @rc int exec prInventoryByMakeModel_Quick_TempTbl @RowCount = @rc output select @rc exec prInventoryByMakeModel_Quick_TempTbl @FirstRec = 26, @LastRec = 50, @RowCount = @rc output */ SET NOCOUNT ON Create table #Inv(ID int identity, Inventoryid int, Make varchar(50), Model varchar(50), Location varchar(50), FirstName varchar(30), LastName varchar(30), AcquisitionType varchar(12), Address varchar(50), City varchar(50), ProvinceId char(3), Country varchar(50), EqType varchar(50), Phone varchar(20), Fax varchar(20), Email varchar(128), UserName varchar(50)) insert into #Inv(InventoryId, Make, Model, Location, FirstName, LastName, AcquisitionType, Address, City, ProvinceId, Country, EqType, Phone, Fax, Email, UserName) SELECT Inventory.Inventoryid, Equipment.Make, Equipment.Model, Location.Location, Contact.FirstName, Contact.LastName, AcquisitionType.AcquisitionType, Location.Address, Location.City, Location.ProvinceId, Location.Country, EqType.EqType, Contact.Phone, Contact.Fax, Contact.Email, Contact.UserName FROM EqType RIGHT OUTER JOIN Equipment ON EqType.EqTypeId = Equipment.EqTypeId RIGHT OUTER JOIN Inventory ON Equipment.EquipmentId = Inventory.EquipmentId INNER JOIN Status
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ON Inventory.StatusId = Status.StatusId LEFT OUTER JOIN AcquisitionType ON Inventory.AcquisitionTypeID = AcquisitionType.AcquisitionTypeId LEFT OUTER JOIN Location ON Inventory.LocationId = Location.LocationId LEFT OUTER JOIN Contact ON Inventory.OwnerId = Contact.ContactId where Make Like @Make and Model Like @Model order by Location, LastName, FirstName select @RowCount = @@rowcount SELECT * FROM #Inv WHERE ID >= @FirstRec AND ID <= @LastRec order by ID return
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The stored procedure should be used the first time in the following manner to get the first batch of records and the number of records:
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declare @rc int exec prInventoryByMakeModel_Quick_TempTbl @RowCount = @rc output select @rc
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The next time, the user must specify the first and last record that he wants to see:
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declare @rc int exec prInventoryByMakeModel_Quick_TempTbl @FirstRec = 26, @LastRec = 50, @RowCount = @rc output
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There are, however, several problems with this solution. You are still executing the query against a large set of normalized tables. You are also creating a large temporary table every time you execute the stored procedure. Because you are working in a stateless environment, you cannot keep the temporary table on the server. Therefore, SQL Server works much harder than it should. The advantage to this technique is that network traffic is significantly reduced.
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To reduce the number of tables that need to be joined every time, you can create a new table that contains all the fields that you typically need in the query. The InventorySum table has such a role in the Asset database.
12: Stored Procedures for Web Search Engines
Most of the fields are just copied from normalized tables. ID is an identity field, which you will use to request a subset of records and to sort records on. Several records have a SIdx suffix. I call them surrogate indexes. They store the position of the record in a set when it is sorted in a particular order. For example, LFNameSIdx is the surrogate index that is used when a recordset is returned sorted by first and last name (see Figure 12-1).
Figure 12-1
Surrogate index
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I have created a stored procedure to be executed periodically from a job to populate the denormalized table:
ALTER Procedure prInvSum_Generate -- Generate denormalized table that will speed-up the querying. As set nocount on Declare @intErrorCode int, @intTransactionCountOnEntry int Select @intErrorCode = @@Error If @intErrorCode = 0 Begin create table #Inv(ID int identity(1,1), Inventoryid int, Make varchar(50), Model varchar(50), Location varchar(50), Status varchar(15), FirstName varchar(30), LastName varchar(30), AcquisitionType varchar(12), Address varchar(50), City varchar(50), ProvinceId char(3), Country varchar(50), EqType varchar(50), Phone varchar(20), Fax varchar(20), Email varchar(128), UserName varchar(50), MakeModelSIdx int, LFNameSIdx int, CountrySIdx int) Select @intErrorCode = @@Error End If @intErrorCode = 0 Begin insert into #Inv(Inventoryid , Make , Model , Location , FirstName , LastName , AcquisitionType, Address , City ,ProvinceId , Country , EqType ,Phone , Fax , Email , UserName ) SELECT Inventory.Inventoryid, Equipment.Make, Equipment.Model, Location.Location, Contact.FirstName,
12: Stored Procedures for Web Search Engines
Contact.LastName, AcquisitionType.AcquisitionType, Location.Address, Location.City, Location.ProvinceId, Location.Country, EqType.EqType, Contact.Phone, Contact.Fax, Contact.Email, Contact.UserName FROM EqType RIGHT OUTER JOIN Equipment ON EqType.EqTypeId = Equipment.EqTypeId RIGHT OUTER JOIN Inventory ON Equipment.EquipmentId = Inventory.EquipmentId LEFT OUTER JOIN AcquisitionType ON Inventory.AcquisitionTypeID = AcquisitionType.AcquisitionTypeId LEFT OUTER JOIN Location ON Inventory.LocationId = Location.LocationId LEFT OUTER JOIN Contact ON Inventory.OwnerId = Contact.ContactId order by Location, LastName, FirstName Select @intErrorCode = @@Error End -- now let s do record sorting ---- Make, Model ------------------If @intErrorCode = 0 Begin create table #tmp (SID int identity(1,1), ID int) Select @intErrorCode = @@Error End If @intErrorCode = 0 Begin insert into #tmp(ID) select ID from #inv order by Make, Model Select @intErrorCode = @@Error End If @intErrorCode = 0 Begin update #inv set MakeModelSIdx = #tmp.SId from #inv inner join #tmp on #inv.ID = #tmp.id Select @intErrorCode = @@Error End If @intErrorCode = 0 Begin drop table #tmp
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