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#168: How can I process the records from query in MS Access? |
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Today I want to show how you may execute the stored query in MS Access database (mdb-file) and process the records in query (view). In the sample code below you may see how do it in Delphi: var access, db, td, queryDef, curField, Value: Variant; str: string; i: Integer; begin { load a DAO in memory } access := CreateOleObject('DAO.DBEngine.36'); {open a database} db := access.OpenDatabase(yourMDBFileName); {find the query by name} queryDef := NULL; td := db.QueryDefs; for i := 0 to td.Count-1 do if (td.Item[i].Name = TableName) then begin queryDef := td.Item[i]; td := UnAssigned; break end; if not VarIsNull(queryDef) and not VarIsEmpty(queryDef) then begin recordset := queryDef.OpenRecordset; {navigate thru records in query} while not recordset.Eof do begin for i := 0 to recordset.Fields.Count-1 do begin curField := recordset.Fields.Item[i]; str := curField.Name; // field name Value := curField.Value; // field value <do something with value> end; recordset.MoveNext; end; {close recordset instance} recordset.Close; recordset := NULL; end; {close database and DAO} db.Close; db := NULL; access := UnAssigned; end;
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