SQLite 回调 function 作为 class 成员

Question

I'm trying to make the SQLite callback function part of my class. Any examples? I have tried this but it isn't compiling:

class Customer
{
    ...
public:
    int callback(void* data, int argc, char **argv, char **azColName);
};

std::string Customer::getCustomer()
{
    ...
    int res = sqlite3_exec(db, sqlStatement.c_str(), callback, nullptr, &errMessage);
    ...
}

The problem is with callback parameter in sqlite3_exec .

Answer 1

You should use static method for sqlite3_exec as a callback.

define: static int callback(void* data, int argc, char **argv, char **azColName);

call: int res = sqlite3_exec(db, sqlStatement.c_str(), Customer::callback, nullptr, &errMessage);