IDalCommand.Parse

Syntax

Parse;

Description

The Parse method analyzes a string, detects operators, conditions and parameters. After analyzing the compiler knows which conditions are used in the SQL query, the number of parameters, and so on.

Example

Sub Main;

Var

MB: IMetabase;

DB: IDatabaseInstance;

Com: IDalCommand;

Cur: IDalCursor;

i: Integer;

Begin

MB := MetabaseClass.Active;

DB := MB.ItemById("BD").Open(Null) As IDatabaseInstance;

Com := DB.Connection.CreateCommand("");

Com.SQL := "Select * From Table_1 Where (Num1 > :Param) And (F_Date = :Param1)";

Com.Parse;

Com.Params.Item(0).Value := 40;

Com.Params.Item(1).Value := "03.03.2000";

Cur := Com.CreateCursor;

While Not Cur.Eof Do

i := i + 1;

Cur.Next;

End While;

Cur.Close;

Com.Close;

End Sub Main;

After executing the example the connection to BD database is established, and the SQL query that selects all records from the Table_1 table, for which the values of the Num1 and F_Date fields satisfy the assigned parameters, is executed. Two parameters are found as a result of the analysis of the SQL query using the Parse method.