Best way to get the ID of the last inserted row on SQLite

Question

On iPhone, what's the best way to get the ID of the last inserted row on an SQLite Database using FMDB ?

Is there a better way rather than doing :

SELECT MAX(ID)

Sibilla

Answer 1

If you can guarantee that your ID column is an auto-increment column, MAX(ID) is fine.

But to cover any case, there's a specialized SQLite function called LAST_INSERT_ROWID():

SELECT LAST_INSERT_ROWID();

In FMDB, you use the -lastInsertRowId method (which internally runs the above):

int lastId = [fmdb lastInsertRowId];

Ginglymus

Why [fmdb lastInsertRowId] always returns 0 for me? – Loaded

@Loaded lastInsertRowId works on a specific connection. The connection that you're using has just been opened, so there is no inserted row ID. You can reference this answer for more information. – Candlewood

I found that LAST_INSERT_ROWID() is connection specific. So if you're opening/closing your connection it won't work the way you might expect. – Complacency

Answer 2

The function sqlite3_last_insert_rowid() is what you're looking for. Having just checked out the source code for FMDB, there seems to be a method on FMDatabase called -lastInsertRowId that wraps the function.

Cautery

@FMDatabase link does not exists – Tawnytawnya

Answer 3

For swift 5 use this code

let lastRowId = sqlite3_last_insert_rowid(db)

for example

if sqlite3_exec(db, stringSql, nil, nil, nil) != SQLITE_OK {
    let errmsg = String(cString: sqlite3_errmsg(db)!)
    print("error Insert: \(errmsg)")
}

let lastRowId = sqlite3_last_insert_rowid(db);
print(lastRowId) // its gives you last insert id

if sqlite3_finalize(statement) != SQLITE_OK {
    let errmsg = String(cString: sqlite3_errmsg(db)!)
    print("error finalizing prepared statement: \(errmsg)")
}
statement = nil

//*** close data base
if sqlite3_close(db) != SQLITE_OK {
    print("error closing database")
}
db = nil

Nylon

Answer 4

Try the following:

var rowid: Int = Int(contactDB.lastInsertRowId())

Foothill