Hello colleagues;
I am new to sqlite, and I have recently started to use it from the command line
(sqlite3.exe) and in C programs.
In my C example program I open de database at the beginning and close it
beforte the end of the program.
Examples like:
memset(orden_SQL, 0, 200*sizeof(char));
sprintf(orden_SQL,"select nBlancos from CORRECCION_EXAMEN where
modelo='%c';",modelo);
sqlite3_get_table(db,orden_SQL,&Resultado,&Rows,&Cols,&errorMsg);
for(i=1;i<=Rows;i++)
{
examen.blancos[i-1]=atoi(Resultado[i]);
}
work perfectly well, but I am having a very annoying problem with
sqlite3_exec() function. The code just after the example above is:
memset(orden_SQL,0,200*sizeof(char));
sprintf(orden_SQL,"update ALUMNO set nota=%0.1f where dni='%s';",nota,dni);
res=sqlite3_exec(db,orden_SQL,0,0,&errorMsg);
sqlite3_free(errorMsg);
and it does not work. "res" value is 0 and "errorMsg" is Error:"Expression
cannot be evaluated".
I have also tried to substitute sqlite3_exec with sqlite3_prepare() +
sqlite3_step() with the same result.
The command "update ALUMNO set nota=9 where dni='12345678P';" works perfect in
the comand line.
What problem I am having here? It is very important for me for the project I am
developping, so I would appreciate a lot any kind of advise.
Best regards,
Alberto
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