SQLite update column if another column exists - ios

Question

Okay, so I'm not sure exactly how to name this question but I can explain what my issue is. I'm creating a webbrowser, and using an sqlite database to store the history. When the page finished loading my method:
-(void)addHistory:(NSString*)title address:(NSString*)url{
sqlite3_stmt *statement;
const char *dbpath = [_databasePath UTF8String];
if (sqlite3_open(dbpath, &_historyDB) == SQLITE_OK)
{
NSString *updateSQL = [NSString stringWithFormat:
#"UPDATE HISTORY SET title='%#' WHERE url='%#'", title, url];
const char *update_stmt = [updateSQL UTF8String];
sqlite3_stmt *stmt;
if (sqlite3_prepare_v2(_historyDB, update_stmt, -1, &stmt, NULL)==SQLITE_OK) {
NSLog(#"Updated");
}else{
NSString *insertSQL =
[NSString stringWithFormat:
#"INSERT INTO HISTORY (title, url, visits, date, search) VALUES (\"%#\", \"%#\", \"%#\", \"%#\", \"%#\")",
title, url, #"todo", #"todo", [NSString stringWithFormat:#"%# %#", title, url]];
const char *insert_stmt = [insertSQL UTF8String];
sqlite3_prepare_v2(_historyDB, insert_stmt,
-1, &statement, NULL);
if (sqlite3_step(statement) == SQLITE_DONE)
{
NSLog(#"Added Entry");
} else {
NSLog(#"Coundn't Add Entry");
}
sqlite3_finalize(statement);
}
sqlite3_close(_historyDB);
}
}
I assumed that if the update failed (because the url is not present in the table) it would move to the else statement and add the key. The main idea behind this is to update the title of the webpage, and once that is working, update other fields such as last visited, amount of times viewed and so on..
I've experimented with a variety of different methods but I just can't seem to achieve the desired results.

Answer 1

To execute the update statement, you must call sqlite3_step for that statement.
To find out how many records were updated, call sqlite3_changes.
And you must handle any errors returned by the sqlite3_prepare_v2 calls.
And you must call sqlite3_finalize for stmt.
And any website with ' in its URL or title will corrupt your SQL statements; to avoid SQL injection attacks, use parameters.

Answer 2

I ended up making the switch to FMDB, a brilliant Objective-C wrapper for SQLite. I then performed a SELECTstatement where the url matched the current one, if it returned a value I updated the database, if not, I simply added to it.