À mon avis, l'utilisation sélective de concaténation et d' esperluettes peut conduire à des formules plus claires.
Cette concaténation des détails d'adresse, utilisant un mélange de CONCATENATE
et&
me semble plus claire:
=CONCATENATE(StreetNumber," ",StreetName," ",StreetType) & CHAR(10) & CONCATENATE(CityName," ",StateCode," ",ZipCode) & CHAR(10) & CountryName
Que l' usage exclusif de &
:
=StreetNumber & " " & StreetName & " " & StreetType & CHAR(10) & CityName & " " & StateCode & " " & ZipCode & CHAR(10) & CountryName
Et l'usage exclusif deCONCATENATE
=CONCATENATE(StreetNumber," ",StreetName," ",StreetType,CHAR(10),CityName," ",StateCode," ",ZipCode,CHAR(10),CountryName)
Encore une fois, je dirais qu’un type de fichier UDF BuildAddress
serait une meilleure solution (et serait mieux placé pour gérer les subtilités du formatage des adresses dans les domaines d’internationalisation - bien que je ne l’aie pas encore implémentée) ...
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
Mais peut-être un autre exemple, qui inclut l'utilisation de &
dans le littéral de chaîne, démontre mieux la difficulté de lire une formule qui s'oblige à utiliser exclusivement des opérateurs:
=A1&"A2&A3&A4"&A5
Pourrait être mieux écrit comme:
=CONCATENATE(A1,"A2&A3&A4",A5)
Mais la performance ce qui compte, . Selon le nombre d’arguments concaténés et la longueur de chaque argument, la CONCATENATE
fonction semble surperformer l’opérateur de concaténation d’un facteur compris entre 4 et 6. Certes, cet exemple est extrême, avec 255 arguments étant concaténés, 10 000 fois. Je ne recommande pas d'utiliser une longueur d'argument supérieure à 32, sinon vous risquez de manquer de mémoire / de bloquer Excel.
Voici un mécanisme de synchronisation grossier:
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
Et les résultats, en fonction de la longueur des chaînes d'argument:
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
Mais alors, nous n'avons même pas discuté de l'éléphant dans la pièce. Vous construisez une commande SQL en utilisant la concaténation. Ne fais pas ça. Vous exécutez une procédure stockée qui accepte les paramètres. À moins que vous n'ayez désinfecté vos entrées (et j'imagine que vous ne l'avez pas fait), créer une chaîne SQL à l'aide de la concaténation demande une attaque par injection SQL. Vous pourriez aussi bien exposer un fichier UDF appelé JohnnyDropTables
...