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SETFILTER Method (Query)
Sets a filter on a column of a query to limit the records in the resulting dataset of a query.
The following code shows the syntax of the SETFILTER method. Query is a variable of the Query data type that specifies the query object.
Query.SETFILTER(Column, String[, Value],...)
The name of the column in the query that you want to filter. The name is defined by the column's Name Property in Query Designer.
Type: Text or code
The filter expression. A valid expression consists of alphanumeric characters and one or more of the following operators: <, >, *, &, |, and =. You can use replacement fields (%1, %2, and so on) to insert values at run-time.
Replacement values to insert in replacement fields in the filter expression. The data type of Value must match the data type of field that is referred to by the ColumnName.
To apply filters to a dataset, the SETFILTER method must be called before the OPEN, SAVEASXML, and SAVEASCSV methods, as shown in the following example. To remove filters from query, you call the CLEAR Method.
Query.SETFILTER(Column1, String); Query.OPEN; Query.READ; CLEAR(Query);
A call to the SETFILTER method automatically closes a query dataset that is currently open. Therefore, the following code is unauthorized and will fail because there is no open dataset for the READ method to read.
Query.OPEN; Query.READ; Query.SETFILTER(Column2, String); Query.READ;
You can have multiple calls to the SETFILTER method. If SETFILTER method calls set filters on different columns, then the filters are combined and applied to the dataset. If consecutive SETFILTER method calls set filters on the same column, then the last SETFILTER method call is applied to the column.
In addition to the SETFILTER method, you can apply filters to a query using the SETRANGE Method (Query) method, the FILTERGROUP method, and the DataItemTableFilter Property and ColumnFilter Property in Query Designer.
|If the SETFILTER method...||then...|
|Sets a filter on the same field as the DataItemTableFilter property||The two filters are joined into a resulting filter.|
|Sets a filter on the same field as the ColumnFilter property||The SETFILTER method overwrites the ColumnFilter property, so the filter that is set by the SETFILTER method that is applied to the dataset.|
|Sets a filter on the same field as the SETRANGE method||The method that is called last is applied to the dataset.|
|Sets a filter on a field that has global filters that are applied by the FILTERGROUP(1) method||The filters of the SETFILTER method are added to the global filters.|
For example, a query has the following filters set on the Quantity column in Query Designer:
DataItemTableFilter property: Quantity=FILTER(<100)
ColumnFilter property: Quantity=FILTER(<>50)
Query.SETFILTER ("Quantity", '>1’)will result in a filter that is equivalent to: 1<Quantity <100.
The following AL code example demonstrates how to use the SETFILTER method on a query. The example code sets a filter on a query column, and then displays a message when the query is run that indicates the filter on the column.
This example requires that you do the following:
Create a query called Customer_SalesQuantity that has the following characteristics:
Links table 18, Customer with table 37, Sales Lines from the CRONUS International Ltd. demonstration database.
Includes columns for the Name and No. fields from the Customer table and the Quantity field from Sales Lines table.
Create the following AL variables and text constant in the object that will run the query, such as a codeunit.
Variable name DataType Subtype MyQuery Query Customer_SalesQuantity Text constant name ENU Value Text000 Customer name = %1, Quantity = %2
The following AL code uses the SETFILTER method to filter the query dataset on the Quantity and Name columns. You can add the code to a codeunit, and then run the codeunit to see the results.
// Sets a filter to display only sales quantities greater than 10. MyQuery.SETFILTER(Quantity, '>10'); // Sets a filter to display the columns with the value Selangorian Ltd. only. MyQuery.SETFILTER(NAME, 'Selangorian Ltd.'); // Runs the query. MyQuery.OPEN; // Reads each row in the dataset and displays message with column values. // Stops reading when there are no more rows remaining in the dataset (READ is FALSE). WHILE MyQuery.READ DO BEGIN MESSAGE(Text000, MyQuery.Name, MyQuery.Quantity); END; // Saves the resulting dataset as a CSV file. MyQuery.SAVEASCSV('c:\temp\CustomerSales.csv'); // Closes the query. Myquery.CLOSE;
When the code is run, a message that resembles the following appears for each row in the dataset:
Customer name = Selangorian Ltd., Quantity = 30