SQLite Incomplete Type Error

Question

I'm writing a C++ program that uses SQLite for database. For this line of code;

void testRun()
{
    // some code here

    sqlite3_stmt stmt;

    // some code here too
}

I get the following error;

error: aggregate 'sqlite3_stmt stmt' has incomplete type and cannot be defined
     sqlite3_stmt stmt;
                  ^

I'm using the amalgamated SQLite source code and have "sqlite3.h" included. What exactly causes this error and how can it be solved? I'm on Windows 7 64bit, using MinGW_64.

I never used sqlite directly from the C library, but I suppose that its types aren't meant to be instantiated directly, but instead you have to keep only opaque pointers to them (like you use `FILE *`). — Matteo Italia, Apr 05 '14 at 12:40
See http://stackoverflow.com/questions/10978020/compiling-sqlite-for-windows-64-bit — Andre Kirpitch, Apr 05 '14 at 12:44

score 3 · Accepted Answer · answered Apr 05 '14 at 12:41

3

That's an opaque structure known only to the implementation. You can't create an instance of it, but you can create a pointer to one:

sqlite3_stmt* stmt;
sqlite3_prepare(db, "SELECT...", -1, &stmt, 0);

answered Apr 05 '14 at 12:41

John Zwinck

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Thank you, it works. Any where to learn more about opaque structures/objects? – Amani Apr 05 '14 at 12:49

SQLite Incomplete Type Error

1 Answers1