Using SQLite from Objective-C -

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I am having trouble writing a statement, especially when updating.

  • I have columns with one parameter, but I do not know special characters like @ or % d .

I did try: 

  const char * sqlStatement = [[NSString stringWithFormat: @ "Update lugar set frecuencia = 'd%' aumentador where idlugar = '% D' ", idlugarParametro] cStringUsingEncoding: NSUTF8StringEncoding];

But I have a problem with: frecuencia = 'd%' aumentador

  • How can I find a guide or tutorial? Am I to use this special character for creation statement? (Use specially aimed.)

Here it is.

Here for Apple documentation, and more.

I think that looks like you typed d% , but possibly for an additional specification of % d for the format specifier Is required), and you have only supplied one arg (idlugger paramitro), but there are two specifiers in your format string: 

  ---------- --- ----------------- 1V ----------------------------- -2v update Lugar set Frequania = '% d' aumentador where idlugar = '% d'

so that you supplied two values Need - New Frequency value is not there.

Finally, suggest that after the basics are hanged, you should consider using the prepared statement - see SQLite Docs.


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