sqlite: add a last_insert_rowid fn (#10341)

vlib/sqlite/sqlite.v

@@ -47,6 +47,8 @@ fn C.sqlite3_open(&char, &&C.sqlite3) int
 
 fn C.sqlite3_close(&C.sqlite3) int
 
+fn C.sqlite3_last_insert_rowid(&C.sqlite3) i64
+
 //
 fn C.sqlite3_prepare_v2(&C.sqlite3, &char, int, &&C.sqlite3_stmt, &&char) int
 
@@ -124,6 +126,12 @@ fn get_int_from_stmt(stmt &C.sqlite3_stmt) int {
 	return res
 }
 
+// Returns last insert rowid
+// https://www.sqlite.org/c3ref/last_insert_rowid.html
+pub fn (db DB) last_insert_rowid() i64 {
+	return C.sqlite3_last_insert_rowid(db.conn)
+}
+
 // Returns a single cell with value int.
 pub fn (db DB) q_int(query string) int {
 	stmt := &C.sqlite3_stmt(0)

vlib/sqlite/sqlite_test.v

@@ -9,8 +9,11 @@ fn test_sqlite() {
 	db.exec('drop table if exists users')
 	db.exec("create table users (id integer primary key, name text default '');")
 	db.exec("insert into users (name) values ('Sam')")
+	assert db.last_insert_rowid() == 1
 	db.exec("insert into users (name) values ('Peter')")
+	assert db.last_insert_rowid() == 2
 	db.exec("insert into users (name) values ('Kate')")
+	assert db.last_insert_rowid() == 3
 	nr_users := db.q_int('select count(*) from users')
 	assert nr_users == 3
 	name := db.q_string('select name from users where id = 1')