From 49a73c8f3cb51d0c7ccfbf91593a39d5587f93f5 Mon Sep 17 00:00:00 2001 From: Dale Hui Date: Sat, 15 Dec 2018 00:05:41 -0800 Subject: [PATCH] Add brief example in README --- README.md | 50 ++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 50 insertions(+) diff --git a/README.md b/README.md index f8a5f16..4bcf8d9 100644 --- a/README.md +++ b/README.md @@ -4,6 +4,56 @@ satomic is a Golang package that makes managing nested SQL transactions/savepoints easier +## Example usage + +```golang +package main + +import ( + "context" + "database/sql" + "github.com/dhui/satomic" + "github.com/dhui/satomic/savepointers/postgres" +) + +// Error handling omitted for brevity. Actual code should handle errors +func main() { + ctx := context.Background() + var db *sql.DB // Use an actual db + + // savepointer should match the db driver used + q, _ := satomic.NewQuerier(ctx, db, postgres.Savepointer{}, sql.TxOptions{}) + + // In transaction + q.Atomic(func(ctx context.Context, q satomic.Querier) error { + var dummy int + q.QueryRowContext(ctx, "SELECT 1;").Scan(&dummy) + + // In first savepoint + q.Atomic(func(ctx context.Context, q satomic.Querier) error { + return q.QueryRowContext(ctx, "SELECT 2;").Scan(&dummy) + }) + + // In second savepoint + q.Atomic(func(ctx context.Context, q satomic.Querier) error { + q.QueryRowContext(ctx, "SELECT 3;").Scan(&dummy) + + // In third savepoint + q.Atomic(func(ctx context.Context, q satomic.Querier) error { + q.QueryRowContext(ctx, "SELECT 4;").Scan(&dummy) + return nil + }) + + return nil + }) + + return nil + }) +} +``` + +A more complete example can be found in the [GoDoc](https://godoc.org/github.com/dhui/satomic) + ## What's with the name? Go **S**QL **atomic** => satomic