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Uma Linha Desconhecida


DataSet
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Olá pessoal... alguém poderia me dizer o que essa linha faz:

if InStr(usuario, "'") or InStr(usuario, """") or InStr(usuario, "=") or InStr(senha, "'") or InStr(senha, """") or InStr(senha, "=") then

sqlflag = True

end if

pra que serve o comando instr ?

e porque tem tantas aspas depois das variaveis?

Agradeço a atenção....

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