How to return the value of AUTO INCREMENT column in SQLite with VB6

问题

I have a table in SQLite:

CREATE TABLE "EventType" 
(
[EventTypeID] INTEGER PRIMARY KEY, 
[EventTypeName] VARCHAR(50) NOT NULL UNIQUE
);

Since EventTypeID is an integer and a primary key, that automatically makes it an auto-incrementing column, and that works fine.

I'd like to insert a row into the table and get the newly incremented value from VB6.

Dim oRs as Recordset
dim oCmd as new Command

oCmd.ActiveConnection = GetConnection()
oCmd.Source = "insert into EventType (EventTypeName) values ('blah')"
oCmd.Execute

Is there an automatic way to retrieve the newly created EventTypeID without having to issue another query (select max(EventTypeID) from EventType))?

I seem to remember from VB6 days long time ago, that there was a way to do that.

回答1:

Does SQLite support SCOPE_IDENTITY?

Check out the FAQ. The sqlite3_last_insert_rowid() function will do it. Careful of triggers though

Not tested, but you should be able to send both statements in one call. It's been a while since I wrote any VB6. Also this is not SQL injection safe.

Dim oRs as Recordset
dim sSql as String
sSql = "INSERT INTO EventType (EventTypeName) VALUES ('blah'); SELECT last_insert_rowid() FROM EventType"
oRs.Open sSql oConn

回答2:

Run this query inside of your code:

SELECT SEQ from sqlite_sequence WHERE name='tablename'

回答3:

I don't use VB, so I don't know the interface you're using with your database, but, as bendewey said, there is a function in the c API called sqlite3_last_insert_rowid() that will return the primary integer key for the last inserted row, so you could look for a similar function in your interface.

If that doesn't work, you can use the SQLite-specific query:

SELECT last_insert_rowid()

回答4:

You can call SELECT last_insert_rowid() after your insert

回答5:

If use

SELECT last_insert_rowid()

returns the last rowid, you can use :

SELECT last_insert_rowid() AS rowid FROM table_name LIMIT 1

for obtain the last rowid for an individual table

来源：https://stackoverflow.com/questions/531109/how-to-return-the-value-of-auto-increment-column-in-sqlite-with-vb6

标签

sqlite

vb6

auto-increment