Fetches data from the Host Integrator server for the current recordset of the current entity.
[Visual Basic]Overloads Public Function FetchRecords( _
ByVal fieldNames As IList, _
ByVal filterExpression As String _
) As DataSet
Parameters
- fieldNames
- Specifies field names to fetch from the recordset.
- filterExpression
- Specifies an expression that qualifies the records to fetch. See the Remarks section for details.
Return Value
This method returns a DataSet containing the requested records. If no fields match the fieldNames provided, or if the filterExpression eliminates all records, an empty DataSet is returned.
Remarks
The set of records returned begins with the first record following the current record. If the current record is before the first record in the recordset, searching starts with the first record. After a FetchRecords, the current record is the last record included in the returned set of records.
Using Filter Expressions
Some of the methods in the .NET connector allow you to use filter expressions when fetching records from a recordset. The syntax you can use to build filter expressions is:
condition_statement=condition_expression
You can use expressions on both the left and right sides of the condition statement. Be sure to enclose data in quotation marks.
Condition Expressions
AND | condition_expression AND condition_expression |
OR | condition_expression OR condition_expression |
NOT | NOT condition_expression |
Equal to | value_expression = value_expression |
Equal to (case insensitive) | value_expression =* value_expression |
Not equal to | value_expression <> value_expression |
Less than | value_expression < value_expression |
Greater than | value_expression > value_expression |
Less than or equal to | value_expression <= value_expression |
Greater than or equal to | value_expression >= value_expression ( ) (multiple condition_expressions) |
Value Expressions
A value expression can take any of the following:
- Variable (variables.variablename)
- Attribute (attribute name)
- Field (recordset.recordsetfield)
- String
- Integer
- Floating point number
Filter Expression Examples
This example returns all records in the patients recordset that are not "Smith":
patients.lastname <> "Smith"
This example returns the exact same set of records as the preceding example:
NOT (patients.lastname = "Smith")
This example returns all records in the SearchResults recordset with the last name "Smith" and first name "Steven":
(SearchResults.LastName = "Smith") and (SearchResults.FirstName =* "Steven")
This example returns all fields in the AccountNumbers recordset greater than or equal to 10000 and less than or equal to 20000:
(AccountNumbers.Accounts >= 10000) and (AccountNumbers.Accounts <= 20000)
See Also
HostIntegratorSession Class | HostIntegratorSession Members | WRQ.Verastream.HostIntegrator Namespace | HostIntegratorSession.FetchRecords Overload List