Using Node.js with Caché - InterSystems Documentation

Advanced Data Access with retrieve() and update()
mydata.close([function(error, result){}]);
3.5 Advanced Data Access with retrieve() and update()
This section describes advanced methods that perform operations that could otherwise be achieved by combining several
of the basic NoSQL-style methods.
The following topics are discussed:
• Using retrieve() — describes retrieving groups of global nodes as a single JSON object
• Using update() — describes writing a single JSON object to update groups of global nodes.
The following Caché data will be used to illustrate the higher level methods.
^Customer(1)="Chris Munt"
^Customer(1, "Address", 1)="London"
^Customer(1, "Address", 2)="UK"
^Customer(1, "DateOfRegistration")="1 May 2010"
^Customer(2)="Rob Tweed"
^Customer(2, "Address", 1)="Reigate"
^Customer(2, "Address", 2)="UK"
^Customer(2, "DateOfRegistration")="7 May 2010"
^Customer(3)="Jane Smith"
^Customer(3, "Address", 1)="Oxford"
^Customer(3, "Address", 2)="UK"
^Customer(3, "DateOfRegistration")="9 June 2010"
3.5.1 Using retrieve()
The following topics are discussed:
• Retrieve a list of global nodes (retrieve("list"))
• Retrieve a list of global nodes recursively (retrieve("array"))
• Retrieve a structured data object (retrieve("object"))
• Controlling the amount of data returned by retrieve operations
3.5.1.1 Retrieve a list of global nodes (retrieve("list"))
This method will return a list of subscript values that are defined directly beneath a given level in the global.
Example 1: Retrieve a list of customer numbers
mydata.retrieve(
{global: "Customer"},
"list",
function(error, result) { // callback code }
);
Result:
Three Customer records:
[1, 2, 3]
Using Node.js with Caché 11