When I insert new data, how do I use one-off execution to verify it first then decide whether to insert a new one or before it is modified

Users
1

When I insert new data, how do I verify it first, then decide whether to insert a new one or before it is modified.
For example:
I already have a node：
{
_:A "Alic " .
_:A _:Amail .
}

AMnode
{
_:Amail "A@mail.com "
_:Amail “123456”
}

But then, I received the new data (name:A@mail.com , newpass:654321,oldpass:09876) need add to dgraph.

How can i use one-off execution in dgraph get the finally data at the beginning of the node AMnode

{
_:Amail "A@mail.com "
_:Amail “123456”
_:Amail “654321”
_:Amail “09876”
}

2

Hey @ogreso

You would have the query for the node first using the parameters, if you don’t find anything you create a new node.

{
  me(func:eq(name, "A@mail.com")) @filter(eq(newpass, "654321") AND eq(oldpass, "09876")) {
    uid
  }
}

Check the result, if the uid exists then use it for updates else create a new node.

4

Can’t you use just one query statement ？
Like this :
if(func:eq(name, “A@mail.com”)){

updates

}else{

create

}

write the code，And just one time interaction with dgraph

5

This is not possible right now but something like this might be introduced in upcoming versions. For now, I’d suggest using transactions to achieve this.

6

Thank you ~ ,I think It’s will be a good function.

7

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