How to set filter on table in Delphi?

The OnFilterRecord event is used to assign a callback filter event handler that can be used to filter records using Delphi or C++ code. All filter operations are completely independent of any active index order. The Filter, FilterOptions, Filtered, and FilterOptimizeLevel properties are used to set an expression filter.

When to use SQL based queries in Delphi?

The SQL based queries are mostly used for reporting purposes. If your query returns a result set, it is sometimes possible to edit the returned dataset. The result set must contain records from a single table and it must not use any SQL aggregate functions. Editing of a dataset returned by the ADOQuery is the same as editing the ADOTAble’s dataset.

How to use like statement for filtering in Delphi?

For more complicated filtering, use the TDataSet.OnFilterRecord event: procedure TForm1.Table1FilterRecord (Dataset: TDataset; var Accept: Boolean); begin // Don’t remember if D7 supports DataSet [FieldName] syntax; if not, // use DataSet.FieldByName instead, or a persistent field.

How to specify a parameter in a Delphi query?

To specify a parameter in a query, use a colon (:) preceding a parameter name. When you close the SQL editor window open the Parameters window by clicking the ellipsis button in the Object Inspector. The parameter in the preceding SQL statement is named apptype.

How to create a filter grid in DevExpress?

The search syntax is described below. Press ESC or click the Clear button. Click the ‘x’ button to the left of the search box or: If the search box is empty, press ESC (the shortcut is in effect if the search box has focus); If the search box is not empty, press ESC twice (the shortcut is in effect if the search box has focus).

How to filter data in a grid panel?

In Grid Views, choose the Show Find Panel command from a column menu. Enter a search string in the search box. In most cases, rows are filtered automatically after a short while. In some cases (mostly when the grid is bound to a large amount of data), you need to press the Find button to manually start the search.

How does the VCL grid work in DevExpress?

The DevExpress VCL Grid allows you to enable grouping across all its Views (Table, Banded, etc). Sort data against an unlimited number of columns. As you would expect, our VCL Data Grid supports sorting against an unlimited number of columns.

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