Hello everyone!
i have been using function select_statement to execute SQL statements as
SELECT, CREATE, DROP, INSERT etc..
then i`ve replaced insert by bind function because you ve told me about
various advantages it has over insert.
now i have realized that in official documentation is also said that its
better to use prepared statements instead of execute function..
I wonder does it apply for all cases?
here is select function that i`ve used:
int select_stmt(const char* stmt) {
char *errmsg;
int ret;
int nrecs = 0;
first_row = 1;
ret = sqlite3_exec(db, stmt, select_callback, &nrecs, &errmsg);
if(ret!=SQLITE_OK) {
printf("Error in select statement %s [%s].\n", stmt, errmsg);
getchar ();
}
else {
printf("\n %d records returned.\n", nrecs);
}
return 0;
}
and new function which uses prepared statements:
bool create (char * command)
{
sqlite3_stmt * statement2;
if ( sqlite3_prepare (db, command, -1, &statement2, 0) != SQLITE_OK )
{
int err = sqlite3_prepare (db, command, -1, &statement2, 0);
const char * pErr = sqlite3_errmsg (db);
printf ("\nError %d occured! \n %s", err, pErr );
return 1;
}
int smth= sqlite3_step (statement2);
printf ("\n result code = %d \n", smth);
//sqlite3_reset (statement2);
sqlite3_finalize (statement2);
return 0;
}
main :
create ("CREATE TABLE two (a,b,c)");
create ("INSERT INTO two (a,b) VALUES (3, 1)");
create ("INSERT INTO two (a,b,c) VALUES (2, 8, 9)");
create ("INSERT INTO two (a,c) VALUES (4, 1)");
create ("SELECT * FROM two");
The thing is that create function does not execute last instruction: create
("SELECT * FROM two");
it returns sqlite_row instead of sqlite_done which i would expect..
I would appreciate if someone could explain me this..
Thanky in advance..
T
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