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macOS sqlite3 build errors in cocoa app

D

dca1367

macrumors newbie
Original poster
Hello,

I'm new to programming with Xcode, so hopefully I'm posting the correct place.

I'm trying to write a Cocoa app that can query an sqlite3 database backend. I'm trying to declare the following variable:

sqlite3_stmt res;

so I can get a result set back from an SQL select statement. But, when I try to build the app, I get the following error:

error: storage size of 'res' isn't known.

I am importing sqlite3.h, and there are some other sqlite3 related functions and data types that are compiling properly, so I'm not sure why there's a problem with this declaration. I've also tried writing a simple C program making use of the sqlite3_stmt data type, and get the same error when using gcc to compile it.

Can anybody tell me why I'm getting the error?

Thanks
 
dca1367 said:
Hello,

I'm new to programming with Xcode, so hopefully I'm posting the correct place.

I'm trying to write a Cocoa app that can query an sqlite3 database backend. I'm trying to declare the following variable:

sqlite3_stmt res;

so I can get a result set back from an SQL select statement. But, when I try to build the app, I get the following error:

error: storage size of 'res' isn't known.

I am importing sqlite3.h, and there are some other sqlite3 related functions and data types that are compiling properly, so I'm not sure why there's a problem with this declaration. I've also tried writing a simple C program making use of the sqlite3_stmt data type, and get the same error when using gcc to compile it.

Can anybody tell me why I'm getting the error?

Thanks
Click to expand...

Yes. sqlite_stmt is an 'opaque' structure, so the compiler doesn't know what size it is. You need to declare res as a pointer type. If you look at the function prototype for sqlite3_prepare(), you will see it expects a sqlite_stmt**.

If you are doing anything with sqlite, I would thoroughly recommend the Apress sqlite book. As an sql novice I found it really useful reference. There is a set of examples you can download from the same site which you might find useful even if you don't buy the book.
 
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