databases

databases

Features

• Paginator - iterate through entities in the Database by using Offset and Limit in the background to "page" through your entries but in your code all you need is to call Next()
• Sql Builders (JOINS not yet supported)
• Dialect abstraction

Code generator

For a sql model with code generator see gensql. It currently generates entities, iterators and repositories.

Usage of DeferredRollbackIfNotHandled

This method should be used with the defer keyword. You can almost think of it like the native golang os.File method Close() that we defer so often. This is a typical file open/close example:

file, err := os.Open("/file/path")
if err != nil {
    log.Fatal(err)
}

doSomething()

defer file.Close()

And now we can use DeferredRollbackIfNotHandled the same way:

tx, err := db.BeginTx()
if err != nil {
    log.Fatalf("Cannot begin transaction, error: %s", err.Error())
}

doSomething()

defer tx.DeferredRollbackIfNotHandled()

In this example if we did a Commit/Rollback as part of doSomething, the DeferredRollbackIfNotHandled would actually do nothing. If we however did not do anything, the transaction will automatically (at defer time) be rolled back.

Note that the DeferredRollbackIfNotHandled also returns an error (which would come from the Rollback), if we want to act upon that we could do this:

tx, err := db.BeginTx()
if err != nil {
    log.Fatalf("Cannot begin transaction, error: %s", err.Error())
}

doSomething()

defer func(){
    if err = tx.DeferredRollbackIfNotHandled(); err != nil {
        //Handle the deferred (rollback) error here
    }
}()

Acknowledgments

• https://github.com/thcyron/sqlbuilder