import ( "context" "io" "time" "cloud.google.com/go/spanner" ) func parseTime(rfc3339Time string) time.Time { t, _ := time.Parse(time.RFC3339, rfc3339Time) return t } func insertGraphData(w io.Writer, db string) error { ctx := context.Background() client, err := spanner.NewClient(ctx, db) if err != nil { return err } defer client.Close() // Values are inserted into the node and edge tables corresponding to // using Spanner 'Insert' mutations. // The tables and columns comply with the schema defined for the // property graph 'FinGraph', comprising 'Person' and 'Account' nodes, // and 'PersonOwnAccount' and 'AccountTransferAccount' edges. personColumns := []string{"id", "name", "birthday", "country", "city"} accountColumns := []string{"id", "create_time", "is_blocked", "nick_name"} ownColumns := []string{"id", "account_id", "create_time"} transferColumns := []string{"id", "to_id", "amount", "create_time", "order_number"} m := []*spanner.Mutation{ spanner.Insert("Account", accountColumns, []interface{}{7, parseTime("2020-01-10T06:22:20.12Z"), false, "Vacation Fund"}), spanner.Insert("Account", accountColumns, []interface{}{16, parseTime("2020-01-27T17:55:09.12Z"), true, "Vacation Fund"}), spanner.Insert("Account", accountColumns, []interface{}{20, parseTime("2020-02-18T05:44:20.12Z"), false, "Rainy Day Fund"}), spanner.Insert("Person", personColumns, []interface{}{1, "Alex", parseTime("1991-12-21T00:00:00.12Z"), "Australia", " Adelaide"}), spanner.Insert("Person", personColumns, []interface{}{2, "Dana", parseTime("1980-10-31T00:00:00.12Z"), "Czech_Republic", "Moravia"}), spanner.Insert("Person", personColumns, []interface{}{3, "Lee", parseTime("1986-12-07T00:00:00.12Z"), "India", "Kollam"}), spanner.Insert("AccountTransferAccount", transferColumns, []interface{}{7, 16, 300.0, parseTime("2020-08-29T15:28:58.12Z"), "304330008004315"}), spanner.Insert("AccountTransferAccount", transferColumns, []interface{}{7, 16, 100.0, parseTime("2020-10-04T16:55:05.12Z"), "304120005529714"}), spanner.Insert("AccountTransferAccount", transferColumns, []interface{}{16, 20, 300.0, parseTime("2020-09-25T02:36:14.12Z"), "103650009791820"}), spanner.Insert("AccountTransferAccount", transferColumns, []interface{}{20, 7, 500.0, parseTime("2020-10-04T16:55:05.12Z"), "304120005529714"}), spanner.Insert("AccountTransferAccount", transferColumns, []interface{}{20, 16, 200.0, parseTime("2020-10-17T03:59:40.12Z"), "302290001255747"}), spanner.Insert("PersonOwnAccount", ownColumns, []interface{}{1, 7, parseTime("2020-01-10T06:22:20.12Z")}), spanner.Insert("PersonOwnAccount", ownColumns, []interface{}{2, 20, parseTime("2020-01-27T17:55:09.12Z")}), spanner.Insert("PersonOwnAccount", ownColumns, []interface{}{3, 16, parseTime("2020-02-18T05:44:20.12Z")}), } _, err = client.Apply(ctx, m) return err }