मेरी राय में, समसामयिक और ampersands के चयनात्मक उपयोग , स्पष्ट सूत्रों को जन्म दे सकता है।
पते के विवरण का यह संयोजन, मेरे मिश्रण का उपयोग करता है CONCATENATEऔर &मुझे स्पष्ट लगता है:
=CONCATENATE(StreetNumber," ",StreetName," ",StreetType) & CHAR(10) & CONCATENATE(CityName," ",StateCode," ",ZipCode) & CHAR(10) & CountryName
के अनन्य उपयोग से &:
=StreetNumber & " " & StreetName & " " & StreetType & CHAR(10) & CityName & " " & StateCode & " " & ZipCode & CHAR(10) & CountryName
और का अनन्य उपयोगCONCATENATE
=CONCATENATE(StreetNumber," ",StreetName," ",StreetType,CHAR(10),CityName," ",StateCode," ",ZipCode,CHAR(10),CountryName)
तो फिर, मैं तर्क देता हूं कि यूडीएफ जैसा BuildAddressएक बेहतर समाधान होगा (और अंतर्राष्ट्रीयकरण डोमेन में पता प्रारूपण की सूक्ष्मताओं को संभालने के लिए बेहतर होगा - हालांकि मैंने इसे लागू नहीं किया है) ...
Public Function BuildAddress(ByVal StreetNumber As String, ByVal StreetName As String, _
ByVal StreetType As String, ByVal CityName As String, ByVal StateCode As String, _
ByVal ZipCode As String, ByVal CountryName As String) As String
BuildAddress = StreetNumber & " " & StreetName & " " & StreetType & vbCrLf & _
CityName & " " & StateCode & " " & ZipCode & vbCrLf & _
CountryName
End Function
लेकिन शायद एक और उदाहरण, जिसमें स्ट्रिंग शाब्दिक के & भीतर का उपयोग शामिल है , बेहतर एक सूत्र को पढ़ने की कठिनाई को दर्शाता है जो विशेष रूप से उपयोग करने के लिए खुद को मजबूर करता है :
=A1&"A2&A3&A4"&A5
बेहतर के रूप में लिखा जा सकता है:
=CONCATENATE(A1,"A2&A3&A4",A5)
लेकिन प्रदर्शन क्या मायने रखता है, और तर्क की संख्या पर निर्भर करता है, और प्रत्येक तर्क की लंबाई के आधार पर, CONCATENATEफ़ंक्शन 4 और 6 के बीच के कारक द्वारा संघनन ऑपरेटर को बेहतर बनाने के लिए प्रकट होगा। उदाहरण के लिए, यह उदाहरण चरम है, 255 तर्क संक्षिप्त किए जा रहे हैं, 10,000 बार। मैं 32 से अधिक तर्क स्ट्रिंग लंबाई का उपयोग करने की अनुशंसा नहीं करता हूं, या आप मेमोरी / क्रैश एक्सेल से बाहर चला सकते हैं।
यहाँ एक क्रूड टाइमिंग तंत्र है:
Option Explicit
Const ConcatenationOperatorFormula As String = _
"=$A$1&$A$2&$A$3&$A$4&$A$5&$A$6&$A$7&$A$8&$A$9&$A$10&$A$11&$A$12&$A$13&$A$14&$A$15&$A$16&$A$17&$A$18&$A$19&$A$20&$A$21&$A$22&$A$23&$A$24&$A$25&$A$26&$A$27&$A$28&$A$29&$A$30&$A$31&$A$32&$A$33&$A$34&$A$35&$A$36&$A$37&$A$38&$A$39&$A$40&$A$41&$A$42&$A$43&$A$44&$A$45&$A$46&$A$47&$A$48&$A$49&$A$50&$A$51&$A$52&$A$53&$A$54&$A$55&$A$56&$A$57&$A$58&$A$59&$A$60&$A$61&$A$62&$A$63&$A$64&$A$65&$A$66&$A$67&$A$68&$A$69&$A$70&$A$71&$A$72&$A$73&$A$74&$A$75&$A$76&$A$77&$A$78&$A$79&$A$80&$A$81&$A$82&$A$83&$A$84&$A$85&$A$86&$A$87&$A$88&$A$89&$A$90&$A$91&$A$92&$A$93&$A$94&$A$95&$A$96&$A$97&$A$98&$A$99&$A$100&" & _
"$A$101&$A$102&$A$103&$A$104&$A$105&$A$106&$A$107&$A$108&$A$109&$A$110&$A$111&$A$112&$A$113&$A$114&$A$115&$A$116&$A$117&$A$118&$A$119&$A$120&$A$121&$A$122&$A$123&$A$124&$A$125&$A$126&$A$127&$A$128&$A$129&$A$130&$A$131&$A$132&$A$133&$A$134&$A$135&$A$136&$A$137&$A$138&$A$139&$A$140&$A$141&$A$142&$A$143&$A$144&$A$145&$A$146&$A$147&$A$148&$A$149&$A$150&$A$151&$A$152&$A$153&$A$154&$A$155&$A$156&$A$157&$A$158&$A$159&$A$160&$A$161&$A$162&$A$163&$A$164&$A$165&$A$166&$A$167&$A$168&$A$169&$A$170&$A$171&$A$172&$A$173&$A$174&$A$175&$A$176&$A$177&$A$178&$A$179&$A$180&$A$181&$A$182&$A$183&$A$184&$A$185&$A$186&$A$187&$A$188&$A$189&$A$190&$A$191&$A$192&$A$193&$A$194&$A$195&$A$196&$A$197&$A$198&$A$199&$A$200&" & _
"$A$201&$A$202&$A$203&$A$204&$A$205&$A$206&$A$207&$A$208&$A$209&$A$210&$A$211&$A$212&$A$213&$A$214&$A$215&$A$216&$A$217&$A$218&$A$219&$A$220&$A$221&$A$222&$A$223&$A$224&$A$225&$A$226&$A$227&$A$228&$A$229&$A$230&$A$231&$A$232&$A$233&$A$234&$A$235&$A$236&$A$237&$A$238&$A$239&$A$240&$A$241&$A$242&$A$243&$A$244&$A$245&$A$246&$A$247&$A$248&$A$249&$A$250&$A$251&$A$252&$A$253&$A$254&$A$255"
Const ConcatenateFunctionFormula As String = _
"=CONCATENATE($A$1,$A$2,$A$3,$A$4,$A$5,$A$6,$A$7,$A$8,$A$9,$A$10,$A$11,$A$12,$A$13,$A$14,$A$15,$A$16,$A$17,$A$18,$A$19,$A$20,$A$21,$A$22,$A$23,$A$24,$A$25,$A$26,$A$27,$A$28,$A$29,$A$30,$A$31,$A$32,$A$33,$A$34,$A$35,$A$36,$A$37,$A$38,$A$39,$A$40,$A$41,$A$42,$A$43,$A$44,$A$45,$A$46,$A$47,$A$48,$A$49,$A$50,$A$51,$A$52,$A$53,$A$54,$A$55,$A$56,$A$57,$A$58,$A$59,$A$60,$A$61,$A$62,$A$63,$A$64,$A$65,$A$66,$A$67,$A$68,$A$69,$A$70,$A$71,$A$72,$A$73,$A$74,$A$75,$A$76,$A$77,$A$78,$A$79,$A$80,$A$81,$A$82,$A$83,$A$84,$A$85,$A$86,$A$87,$A$88,$A$89,$A$90,$A$91,$A$92,$A$93,$A$94,$A$95,$A$96,$A$97,$A$98,$A$99,$A$100," & _
"$A$101,$A$102,$A$103,$A$104,$A$105,$A$106,$A$107,$A$108,$A$109,$A$110,$A$111,$A$112,$A$113,$A$114,$A$115,$A$116,$A$117,$A$118,$A$119,$A$120,$A$121,$A$122,$A$123,$A$124,$A$125,$A$126,$A$127,$A$128,$A$129,$A$130,$A$131,$A$132,$A$133,$A$134,$A$135,$A$136,$A$137,$A$138,$A$139,$A$140,$A$141,$A$142,$A$143,$A$144,$A$145,$A$146,$A$147,$A$148,$A$149,$A$150,$A$151,$A$152,$A$153,$A$154,$A$155,$A$156,$A$157,$A$158,$A$159,$A$160,$A$161,$A$162,$A$163,$A$164,$A$165,$A$166,$A$167,$A$168,$A$169,$A$170,$A$171,$A$172,$A$173,$A$174,$A$175,$A$176,$A$177,$A$178,$A$179,$A$180,$A$181,$A$182,$A$183,$A$184,$A$185,$A$186,$A$187,$A$188,$A$189,$A$190,$A$191,$A$192,$A$193,$A$194,$A$195,$A$196,$A$197,$A$198,$A$199,$A$200," & _
"$A$201,$A$202,$A$203,$A$204,$A$205,$A$206,$A$207,$A$208,$A$209,$A$210,$A$211,$A$212,$A$213,$A$214,$A$215,$A$216,$A$217,$A$218,$A$219,$A$220,$A$221,$A$222,$A$223,$A$224,$A$225,$A$226,$A$227,$A$228,$A$229,$A$230,$A$231,$A$232,$A$233,$A$234,$A$235,$A$236,$A$237,$A$238,$A$239,$A$240,$A$241,$A$242,$A$243,$A$244,$A$245,$A$246,$A$247,$A$248,$A$249,$A$250,$A$251,$A$252,$A$253,$A$254,$A$255)"
Const ARGUMENT_STRING_LENGTH As Long = 1
Sub test2()
Dim start As Single
'Disable app events to exclude UI/calculation artefacts
Application.ScreenUpdating = False
Application.EnableEvents = False
Application.Calculation = xlCalculationManual
Dim inputs As Range
Set inputs = Range("A1:A255")
Dim operatorRange As Range
Set operatorRange = Range("B1:B10000")
Dim functionRange As Range
Set functionRange = Range("C1:C10000")
'Reset the range values/formulas
inputs.Value2 = ""
operatorRange.Formula = ConcatenationOperatorFormula
functionRange.Formula = ConcatenateFunctionFormula
'Change the inputs to invalidate the calculation results
inputs.Value2 = String(ARGUMENT_STRING_LENGTH, "B")
'Time the calculation of operator formulas
start = Timer
operatorRange.Calculate
Debug.Print "Operator Calculation", ARGUMENT_STRING_LENGTH, FormatNumber(Timer - start, 8)
'Time the calculation of function formulas
start = Timer
functionRange.Calculate
Debug.Print "Function Calculation", ARGUMENT_STRING_LENGTH, FormatNumber(Timer - start, 8)
'Reset the range values to empty
inputs.Value2 = ""
operatorRange.Value2 = vbNullString
functionRange.Value2 = vbNullString
'Restore App defaults
Application.ScreenUpdating = True
Application.EnableEvents = True
Application.Calculation = xlCalculationAutomatic
End Sub
और परिणाम, तर्क तार की लंबाई के अनुसार:
Method String Length Seconds
--------------------- -------------- -----------
Function Calculation 1 0.06640625
Operator Calculation 1 0.21484380
Function Calculation 10 0.09765625
Operator Calculation 10 0.47265630
Function Calculation 32 0.17578130
Operator Calculation 32 1.17968800
लेकिन फिर, हमने कमरे में हाथी की चर्चा भी नहीं की। आप एक SQL कमांड का उपयोग कर निर्माण कर रहे हैं। ऐसा मत करो। आप एक संग्रहीत प्रक्रिया निष्पादित कर रहे हैं जो मापदंडों को स्वीकार करता है। जब तक आपने अपने इनपुट्स को सैनिटाइज़ नहीं किया है (और मैं अनुमान लगा रहा हूं कि आप नहीं हैं), एसक्यूएल स्ट्रिंग का निर्माण, कॉन्ट्रासेप्शन का उपयोग करते हुए एसक्यूएल-इंजेक्शन हमले के लिए पूछ रहा है। आप यूडीएफ नामक एक चीज को उजागर कर सकते हैं JohnnyDropTables...
