convert string to barcode c# En ca psu la t ing M or e Logic w it h M u lt ist a t e m e nt UD Fs in Visual Basic .NET

Making ECC200 in Visual Basic .NET En ca psu la t ing M or e Logic w it h M u lt ist a t e m e nt UD Fs

En ca psu la t ing M or e Logic w it h M u lt ist a t e m e nt UD Fs
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A m ult ist at em ent t able- valued UDF prov ides subst ant ially m or e flex ibilit y t han is available from an inline UDF. While an inline UDF rest r ict s you t o a single SELECT st at em ent , a m ult ist at em ent UDF can cont ain m ult iple SELECT st at em ent s along wit h ot her k inds of T- SQL st at em ent s. The w ide range of st at em ent s t hat y ou can place inside a m ult ist at em ent UDF allows you t o creat e m or e flex ible funct ions t hat can sim plify t he logic of T- SQL st at em ent s t hat r eference t hem or even recover from invalid input . The follow ing scr ipt cont ains a m ult ist at em ent UDF t hat can r et ur n t hree different t ypes of result set s. The UDF accom plishes t his feat w it h t he aid of a couple of input param et ers and nest ed I F ELSE st at em ent s t hat t est t he input param et er values. The @Report sTo param et er designat es t he m anager for w hom t o r et urn a result set . The par am et er has an int dat a t ype, and it denot es a m anager s em ploy ee I D. The @I ndirect param et er has a bit dat a t y pe. The value 0 is for dir ect report s, and t he v alue 1 is for t he r et ur n of direct and indirect r eport s. The logic inside t he CREATE FUNCTI ON st at em ent accom m odat es one invalid pair of input param et ers t o dem onst rat e w hat y ou can accom plish w it h a m ult ist at em ent UDF. This logic t raps for a r equest of indir ect report s for t he m anager w hose Em ploy eeI D value is 5. This r equest is invalid for t he Em ployees t able in t he Nort hwind dat abase because t his m anager has only dir ect report s. The funct ion recovers from t he r equest by supply ing only dir ect report s t o t he m anager. Aft er creat ing t he m ult ist at em ent UDF wit h a CREATE FUNCTI ON st at em ent , t he script launches four SELECT st at em ent s t hat refer ence t he UDF. The param et ers for t he SELECT st at em ent s allow y ou t o confirm t he flex ibilit y of t he UDF. The first SELECT st at em ent ret urns t he direct r eport s t o Andrew Fuller , whose Em ploy eeI D is 2. The second SELECT st at em ent r et urns t he dir ect report s t o St even Buchanan, w hose Em ploy eeI D is 5. The t hird SELECT st at em ent includes t he Em ploy eeI D v alue for Andrew Fuller again, but it set s @I ndir ect t o 1. This perm it s t he UDF t o ret urn t he result for a union query inst ead of a sim ple param et er query ( as in t he first t wo SELECT st at em ent s) . The fourt h SELECT st at em ent r equest s t he dir ect and indirect r epor t s for t he m anager w hose Em ploy eeI D is 5, nam ely St ev en Buchanan. This request s passes cont rol t o t he last I F clause in t he UDF and ret urns j ust t he direct r eport s for St ev en Buchanan. The UDF could hav e pr int ed a cust om m essage wit h t he RAI SERROR st at em ent . --udfReportsTable --Drop old version of user-defined function if it exists. IF EXISTS(SELECT * FROM INFORMATION_SCHEMA.ROUTINES WHERE ROUTINE_NAME = udfReportsTable ) DROP FUNCTION udfReportsTable GO --Create multistatement table-valued function. CREATE FUNCTION udfReportsTable(@ReportsTo int, @Indirect bit) RETURNS @TableOut TABLE( FirstName varchar(10) NOT NULL, LastName varchar(20) NOT NULL, Extension varchar(4) NULL ) AS BEGIN IF @Indirect = 0 INSERT @TableOut SELECT FirstName, LastName, Extension FROM Northwind..Employees WHERE ReportsTo = @ReportsTo ELSE IF @ReportsTo = 2 INSERT @TableOut SELECT FirstName, LastName, Extension FROM Northwind..Employees
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WHERE ReportsTo = @ReportsTo UNION SELECT FirstName, LastName, Extension FROM Northwind..Employees WHERE ReportsTo <> @ReportsTo AND ReportsTo IS NOT NULL ELSE IF @ReportsTo = 5 INSERT @TableOut SELECT FirstName, LastName, Extension FROM Northwind..Employees WHERE ReportsTo = @ReportsTo RETURN END GO --Print direct reports to Andrew Fuller. SELECT * FROM udfReportsTable(2,0) --Print direct reports to Steven Buchanan. SELECT * FROM udfReportsTable(5,0) --Print direct and indirect reports to Andrew Fuller. SELECT * FROM udfReportsTable(2,1) --Demo recovery from Indirect Reports request for Steven Buchanan. SELECT * FROM udfReportsTable(5,1)
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