Objective C Sqlite Update Query Based on ID - objective-c

Question

Trying to learn Sqlite without using a wrapper and have managed most things but am really stuck on UPDATE queries
I am trying to update a sting in one column based on its _ID number which is the primary Key and is unique.
I have tried all sorts of code from all over google . This one says it has worked but when I check the column has not been updated
here is the code
NSDateFormatter *formatter;
NSString *dateString;
formatter = [[NSDateFormatter alloc] init];
[formatter setDateFormat:#"dd-MM-yyyy HH:mm"];
dateString = [formatter stringFromDate:[NSDate date]];
NSString *IDCODE = code.stringValue;
NSInteger b = [IDCODE integerValue];
sqlite3 *contactDB; //Declare a pointer to sqlite database structure
const char *dbpath = [dbPath UTF8String]; // Convert NSString to UTF-8
if (sqlite3_open(dbpath, &contactDB) == SQLITE_OK)
{
//Database opened successfully
NSString *databaseName = #"vistorlog.db";
// Get the path to the documents directory and append the databaseName
NSArray *documentPaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDir = [documentPaths objectAtIndex:0];
NSString *databasePath = [documentsDir stringByAppendingPathComponent:databaseName];
const char *dbPath=[databasePath UTF8String];
if (sqlite3_open(dbPath, &myDB)==SQLITE_OK) {
NSLog(#"database Opened");
const char* updateQuery="update LOG set TIMEOUT='22/03/19' where _ID=1";
sqlite3_stmt *stmt;
if (sqlite3_prepare_v2(myDB, updateQuery, -1, &stmt, NULL)==SQLITE_OK) {
NSLog(#"Query Executed");
}else{
NSLog(#"Query NOT Executed");
}
}
sqlite3_close(myDB);
}
else {
//Failed to open database
}
It opens the DB vistorlog.db ok. There is a table called LOG and there is column called TIMEOUT which is where I want the string to be updated and there is a column called _ID which is what Im basing the query on yet it won't update
eventually I want to have the update statement use the string variable dateString as the string to update and b as the integer variable for the _ID
any ideas where Im going wrong?
Any help appreciated
Mark
EDIT
WORKING CODE TO UPDATE A QUERY
sqlite3 *contactDB; //Declare a pointer to sqlite database structure
const char *dbpath = [dbPath UTF8String]; // Convert NSString to UTF-8
if (sqlite3_open(dbpath, &contactDB) == SQLITE_OK)
{
//Database opened successfully
NSString *databaseName = #"vistorlog.db";
// Get the path to the documents directory and append the databaseName
NSArray *documentPaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDir = [documentPaths objectAtIndex:0];
NSString *databasePath = [documentsDir stringByAppendingPathComponent:databaseName];
const char *dbPath=[databasePath UTF8String];
if (sqlite3_open(dbPath, &myDB)==SQLITE_OK) {
NSLog(#"database Opened");
// define dateString and IDCODE as strings before this
const char *updateQuery = "Update log set TIMEOUT=? where _ID=?";
sqlite3_stmt *stmt;
// Prepare Stment
if (sqlite3_prepare_v2(myDB, updateQuery, -1, &stmt, NULL) == SQLITE_OK) {
sqlite3_bind_text(stmt, 1, [dateString UTF8String], -1, SQLITE_TRANSIENT);
sqlite3_bind_text(stmt, 2, [IDCODE UTF8String], -1, SQLITE_TRANSIENT); if(sqlite3_step(stmt) == SQLITE_DONE) {
NSLog(#"Query Executed");
} else {
NSLog(#"Query NOT Executed: %s", sqlite3_errmsg(myDB));
}
sqlite3_finalize(stmt);
}else{
NSLog(#"Statement NOT Prepared: %s", sqlite3_errmsg(myDB));
}
}
sqlite3_close(myDB);
}
else {
//Failed to open database
}
Don't forget to import sqlite3.h
Mark

Answer 1

You are only preparing the statement but not actually executing it.
You need to execute sqlite3_step() after you execute sqlite3_prepare_v2
if (sqlite3_prepare_v2(myDB, updateQuery, -1, &stmt, NULL) == SQLITE_OK) {
if(sqlite3_step(stmt) == SQLITE_DONE) {
NSLog(#"Query Executed");
} else {
NSLog(#"Query NOT Executed: %s", sqlite3_errmsg(myDB));
}
sqlite3_finalize(stmt);
}else{
NSLog(#"Statement NOT Prepared: %s", sqlite3_errmsg(myDB));
}