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Update README with clear explanation of transaction db handle

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Rohan Allison 2015-06-16 23:28:54 -05:00
parent 64f61aaaf9
commit ded91a21fe
1 changed files with 9 additions and 6 deletions
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README.md
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@ -855,23 +855,26 @@ db.Joins("left join users on users.id = emails.user_id").Where("users.name = ?",
## Transactions ## Transactions
All individual save and delete operations are run in a transaction by default. To perform a set of operations within a transaction, the general flow is as below.
The database handle returned from ``` db.Begin() ``` should be used for all operations within the transaction.
(Note that all individual save and delete operations are run in a transaction by default.)
```go ```go
// begin // begin
tx := db.Begin() tx := db.Begin()
// do revertable work in a transaction (use 'tx' in place of 'db') // do some database operations (use 'tx' from this point, not 'db')
tx.Exec tx.Create(...)
...
// rollback // rollback in case of error
tx.Rollback() tx.Rollback()
// commit // Or commit if all is ok
tx.Commit() tx.Commit()
``` ```
### More Complex Example ### A Specific Example
``` ```
func CreateAnimals(db *gorm.DB) err { func CreateAnimals(db *gorm.DB) err {
tx := db.Begin() tx := db.Begin()