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README: add/explain SetMaxOpenConns(1) #70

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README: add/explain SetMaxOpenConns(1) #70

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5 changes: 5 additions & 0 deletions README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -46,13 +46,17 @@ func main() {
log.Fatal(err)
}
defer db.Close()
db.SetMaxOpenConns(1)

if _, err := db.Exec(`INSERT INTO users(username) VALUES("gopher")`); err != nil {
log.Fatal(err)
}
}
```

Note that `db.SetMaxOpenConns(1)` disables concurrent database transactions,
which [txdb does not support](https://github.com/DATA-DOG/go-txdb/issues/69).

You can also use [`sql.OpenDB`](https://golang.org/pkg/database/sql/#OpenDB) (added in Go 1.10) rather than registering a txdb driver instance, if you prefer:

``` go
Expand All @@ -69,6 +73,7 @@ import (
func main() {
db := sql.OpenDB(txdb.New("mysql", "root@/txdb_test"))
defer db.Close()
db.SetMaxOpenConns(1)

if _, err := db.Exec(`INSERT INTO users(username) VALUES("gopher")`); err != nil {
log.Fatal(err)
Expand Down