经典小巧的表格组件 EhLib4.14

经典小巧的表格组件 What's new in version 4. * This version does not support Delphi 4 and C++ Builer 4 anymore. + There are new components for unified loading tabular information from server to client with after-treatment this data on the client: 　editing, sorting, filtrations and unloading changed given on 　the server back. Components do not include drivers to access to server. 　To ensure functionality of components it is sufficiently to write a 　global event that execute SQL expression with parameters using your 　favorite access data base engine and return DataSet-cursor. 　The technology is represented by two main component: 　　TMemTableEh - dataset, which hold all data in memory. 　　You can consider it as array of records. 　　　More other it: 　　　　Supports a special interface, that allows DBGridEh component 　　　　　to view all datas without moving active record. 　　　　Allows load data from TDataDriverEh (DataDriver property). 　　　　Allows to unload changes back to DataDriver, operative or postponed 　　　　　(in dependencies of CachedUpdates property). 　　　　Allows to create master/datail relationship on client side 　　　　　(by filterring record) or on external source (by updating 　　　　　parameters [Params] and requering data from DetailDataDriver). 　　　　Allows to sort datas, including Calculated and Lookup field. 　　　　Allows to create and fill data at design-time and save data in dfm 　　　　　file of the form. 　　　　Allows to keep records tree like relations. Each record can 　　　　　have record nodes and work as node of parental record. TDBGridEh 　　　　　component can show of the tree-type structure of records. 　　　　Allows to show internal array of other TMemTableEh ( ExternalMemData 　　　　　property ) and work with this data: sort, filter, edit. 　　　　Has an interface to get the list of all values of the field, 　　　　 ignoring local filter. TDBGridEh uses this property for 　　　　 automatic building a list in DropDownBox of the filter. 　　 TDataDriverEh - executes two tasks: 　　　　1. Delivers records in TMemTableEh. 　　　　2. Processes records, changed in TMemTableEh (writes them in other 　　　　　 dataset, or call events for processing the changes to the program). 　　 Furthermore, there are several components that inheritted from TDataDriverEh. 　　 It is a TSQLDataDriverEh, that have properies to keep four SQL expressions and 　　 parameters for querying data, removing a record, insertions record, 　　 updating record and querying one record. TSQLDataDriverEh can not requests data 　　 from server, but can prepare parameters of the request and call global 　　 event, where programm can transfer SQL expression on the server. 　　 There are several components that inherited from TSQLDataDriverEh, which 　　 can send SQL expressions on the server through the corresponding access engine. 　　 It is TBDEDataDriverEh, TIBXDataDriverEh, TDBXDataDriverEh and TADODataDriverEh 　　 component. 　　 There are a powerful design-time editors for TMemTableEh and TSQLDataDriverEh. * New version of TDBGridEh has changed a parent. Now TCustomDBGridEh is inheritted 　from TCustomGridEh. If in your forms DBGrid and DBGridEh are not used 　simultaneously then turning on the new version must not appear a problems. 　However in some cases compiler can raise error about inconsistency of 　Grids.TGridDrawState and GridsEh.TGridDrawState types or similar errors. 　To deliverance from this errors it is necessary to delete 'Grids' and 　'DBGrids' unit from the 'uses' clause. If 'Grids' and 　'DBGrids' are necessary in the uses clause, then it is need to move 　these strings in place before 'GridsEh' and 'DBGridEh'. 　If even in this case you will get error messages about TGridDrawState types, 　it is necessary to elaborate the name of type by the name of the module. 　For instance write GridsEh.TGridDrawState or Grids.TGridDrawState instead 　of TGridDrawState. + In TDBGridEh 　　Added ContraColCount property. Property defines amount write nonscrolled 　　columns. These columns can not get a input focus. + If DBGridEh is connected to TMemTableEh, then it allows: 　　View all datas, not moving active record. 　　Show data as tree (If TMemTableEh is in the TreeList mode). 　　Move records as tree-node in tree (When dgsRowMoving is in OptionsEh). 　　Automatic building a list in DropDownBox of the filter cell.