Unable to get the last inserted data from sqlite table - ios

Question

In my application I need to get the data from the last inserted into table. What I have done is this
NSString *query = [NSString stringWithFormat:#"SELECT * FROM PHONEBOOK ORDER BY NAME DESC LIMIT 1;"];
// NSLog(#"query : %#",query);
BOOL recordExist = [self recordExistOrNot:query];
if (!recordExist) {
// save data if no record exists
}
-(BOOL)recordExistOrNot:(NSString *)query{
BOOL recordExist=NO;
sqlite3_stmt *statement;
const char *dbpath = [databasePath UTF8String];
if (sqlite3_open(dbpath, &myDatabase) == SQLITE_OK) {
if (sqlite3_prepare_v2(myDatabase, [query UTF8String], -1, &statement, nil)==SQLITE_OK)
{
if (sqlite3_step(statement)==SQLITE_ROW)
{
recordExist=YES;
NSString *Name = [[NSString alloc]
initWithUTF8String:
(const char *) sqlite3_column_text(
statement, 0)];
NSString *PhoneNumber = [[NSString alloc]
initWithUTF8String:
(const char *) sqlite3_column_text(
statement, 1)];
//here i need to get the Name and number from the last inserted data
NSLog(#"version is %#, type is %#",Name ,PhoneNumber);
}
else
{
NSLog(#"%s,",sqlite3_errmsg(myDatabase));
}
sqlite3_finalize(statement);
sqlite3_close(myDatabase);
}
}
return recordExist;
}
The problem is I'm not getting the last inserted data. I am getting the data from other rows ( i am not sure whether it is from top row or any other) .
Could you please tell me what am I doing wrong here.
Thanks in advance.

Answer 1

If doing this immediately after inserting the row, you can use the SQLite C function sqlite3_last_insert_rowid() to get the rowid for the last inserted row. You can also use the last_insert_rowid() SQL function:
SELECT * FROM PHONEBOOK WHERE ROWID = last_insert_rowid()
Note, you probably have to keep the SQLite database open to do this (but you shouldn't be opening and closing the database for every SQL statement, anyway).
If you're doing this at some later date (e.g. the user terminates the app, comes back to it tomorrow, and wants to see the last inserted record), then you have to rely upon your own database model to handle that. For example, I frequently will have create/modify/delete timestamps in my table that I update every time I INSERT or UPDATE the row, and you can then sort based upon those values.