Fix `insertWithLastInsertID()` so it also works with *string IDs

ksql.go

@@ -540,6 +540,12 @@ func (c DB) insertWithLastInsertID(
 		// we cannot retrieve it, so we just return:
 		return nil
 
+	case reflect.Pointer:
+		if fieldType.Elem().Kind() == reflect.String {
+			return nil
+		}
+
+		fallthrough
 	default:
 		return fmt.Errorf(
 			"can't convert last insert id of type int64 into field `%s` of type %v",

test_adapters.go

@@ -808,6 +808,33 @@ func InsertTest(
 					tt.AssertEqual(t, result.Address, u.Address)
 				})
 
+				t.Run("should insert one user correctly when the ID is a pointer to string", func(t *testing.T) {
+					c := newTestDB(db, dialect)
+
+					type ptrUser struct {
+						Name    *string `ksql:"name"`
+						Address address `ksql:"address,json"`
+					}
+					name := "FernandaIsTheID"
+					u := ptrUser{
+						Name: &name,
+						Address: address{
+							Country: "Brazil",
+						},
+					}
+
+					err := c.Insert(ctx, NewTable("users", "name"), &u)
+					tt.AssertNoErr(t, err)
+					tt.AssertEqual(t, u.Name, &name)
+
+					result := user{}
+					err = getUserByName(db, dialect, &result, "FernandaIsTheID")
+					tt.AssertNoErr(t, err)
+
+					tt.AssertEqual(t, &result.Name, u.Name)
+					tt.AssertEqual(t, result.Address, u.Address)
+				})
+
 				t.Run("should insert ignoring the ID with multiple ids", func(t *testing.T) {
 					if dialect.InsertMethod() != sqldialect.InsertWithLastInsertID {
 						return