Sqlite_binding methods - objective-c

Question

How can I write this query without using stringWithFormat. How can I pass parameters to the SQLite Query. Now my code is this:
NSString *querySQL = [NSString stringWithFormat:#"SELECT name, char_code, sound, status From Tmy_table Where ID=\"%d\"", i];
Thanks in advance

Answer 1

You should use sqlite3 host parameters and sqlite3_bind() to bind variables to them. This would like something like this in your example.
NSString* query = #"SELECT name, char_code, sound, status From Tmy_table Where ID=?";
sqlite3_stmt* myStatement = NULL;
sqlite3_prepare_v2(myDBConnection, [query UTF8String], -1, &myStatement, NULL);
sqlite3_bind_int(myStatement, 1, i);
Points to note:
The two sqlite3 functions return error codes that you must check. I've left that out for clarity.
The second parameter in sqlite3_bind_int() tells you which question mar to replace with the third parameter. The index starts at 1, not 0.
See also docs about binding.

Answer 2

NSString sql = #"SELECT name, char_code, sound, status From Tmy_table Where ID=?";
sqlite3_stmt *stmt = NULL;
if (sqlite3_prepare_v2(database, [sql UTF8String], -1, &stmt, SQLITE_STATIC) == SQLITE_OK)
{
// If 'i' was text:
// if (sqlite3_bind_text(stmt, 1, i, -1, SQLITE_STATIC) == SQLITE_OK)
if (sqlite3_bind_int(stmt, 1, i) == SQLITE_OK) // Note: 1-based column when binding!!!!
{
while (sqlite3_step(stmt) == SQLITE_ROW)
{
const char *name = sqlite3_column_text(stmt, 0); // Note: 0-based column when fetching!!!
const char *sound = sqlite3_column_text(stmt, 1);
const char *status = sqlite3_column_text(stmt, 2);
// ... print the values or whatever
}
}
else
{
NSLog(#"Failed to bind int: %s", sqlite3_errmsg(database));
}
sqlite3_finalize(stmt);
}
else
{
NSLog(#"Failed to prepare statement '%#': %s", sql, sqlite3_errmsg(database));
}
EDIT Changed the bind to sqlite3_bind_text() as i appears to be text...