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Services

QuickStart Module

This quickstart module gives an overview of how you can connect to the remote services, creating some data and storing it in the cloud.

Active Variables​

The OpenDataDSL remote services are exposed in the language using a syntax known as Active Variables. Active variables are also used for non-remote services such as the memory and date service.

The basic syntax for an active variable is:

${service_name:"entity_name"}

Active variables are used in the following scenarios:

  • Searching
  • Aggregating
  • Reading a single entity
  • Saving an entity
  • Deleting an entity
  • Tagging a version of an entity
In-Depth Information

Variable Services​

Variable services consist of a date service for making it easier to work with dates and the memory service which allows you to store and re-load the current memory state.

Date service examples:

// Use the date service to create various dates
print ${date:"today"}
print ${date:"yesterday"}
print ${date:"tomorrow"}

print ${date:"startofweek"}
print ${date:"endofweek"}
print ${date:"startofmonth"}
print ${date:"endofmonth"}
print ${date:"startofyear"}
print ${date:"endofyear"}

print ${date:"thursday"}
In-Depth Information

Memory service examples:

// Same current memory to a file
save ${memory:file/"c:/temp/memory.json"}

// Reload memory
x=${memory:file/"c:/temp/memory.json"}
In-Depth Information

Remote Services​

Remote services interact with the OpenDataDSL remote services allowing you to find, create, read, update and delete entities.

Remote service examples:

// Create a private type
TypeCRUD = type
    name as String() default "test"
end
save ${type:TypeCRUD}

// Get a list of private types
tl = find ${type}
for tp in tl
    print tp.name
next

// Read private type
tc = ${type:"TypeCRUD"}

// Delete private type
delete ${type:"TypeCRUD":*}
In-Depth Information

External Services​

External services allow you to interact with the outside world, and are mainly used for collecting data from websites and dealing with different file formats.

External service examples:

// Grab one of the UCI data sets for Balloons
// https://archive.ics.uci.edu/ml/datasets/Balloons

csvdata = ${csv:"https://archive.ics.uci.edu/ml/machine-learning-databases/balloons/adult+stretch.data","headerpos=0"}
print csvdata.size
for row in csvdata
    print row
next

// XML examples showing use of an xpath selector

xmldata=${xml:"https://www.ecb.europa.eu/stats/eurofxref/eurofxref-daily.xml"}
print xmldata

xmldata=${xml:"https://www.ecb.europa.eu/stats/eurofxref/eurofxref-daily.xml", "selector=[currency]"}
print xmldata

xmldata=${xml:"https://www.ecb.europa.eu/stats/eurofxref/eurofxref-daily.xml", "selector=[currency='GBP']"}
print xmldata
In-Depth Information