Lookup.WebService Details

Element Details: Lookup.WebService

Available in: Logi Info

Source code name: Lookup.WebService

Lookup is used to join the rows of a DataLayer with data from another data source.

Unlike a standard Join element, a Lookup element does not require that all of the target data is downloaded prior to the join. Instead Lookup elements will execute the query once for each row of data. This is ideal when trying to join small data sets to very large data sets.

Define the method and parameters with “WebServiceMethod” element. The standard @Data token is used to access column values.

All of the returned data rows are added to the DataLayer. Use the MaxRows attribute to limit the number of records added for each query.

If the “ExceptionDataID” attribute has a value, any records in the DataLayer that do not have a match will be moved into a separate DataLayer. If left blank, those records will remain in the original DataLayer.

Element Group:Merge and Join

ATTRIBUTES

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Name

Possible Values

Description

ConnectionID

UserDefined

Specifies a connection to a data source that is defined in the Settings. For elements connecting to relational databases, default is the first Connection element in _settings.lgx.

ExceptionDataID

UserDefined

Defines an ETL ID value that can be used to address the exception data that was removed by the filter. The value of this attribute may be referenced by a DataLayer.ETL, LoadDbTable, SaveData, or any other element that supports the EtlElementID attribute.

UserDefined

(Required) The ID attribute is a pervasive attribute that uniquely identifies an element within a definition file. The ID needs to be a unique value within the definition.

MaxRows

UserDefined

The maximum number of rows to retrieve from the data source.

XPath

UserDefined

Specifies a standard XPath string that will be used to select a set of matching nodes. All of the matching nodes are then used to generate the resulting datalayer.

PARENT ELEMENTS

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CHILD ELEMENTS

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Web Service Method