www.pudn.com > sybase_dblib4.zip > Sybmemo.pas

unit sybmemo; 
 
interface 
 
uses 
  Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs, 
  StdCtrls,dsgnintf; 
 
type SybObjectname = string[30]; 
 
type 
  TTypes = (datetime,float,int,char,bit,text); 
 
type 
  Tsybobjectproperty = class(TStringProperty) 
  public 
    procedure GetValues(TheProc: TGetStrProc); override; 
    function getattributes:Tpropertyattributes; override; 
  end; 
 
type 
  TSybMemo = class(TMemo) 
  private 
    fdatatype     :SybObjectname; 
    flength       :smallint; 
    ftablename    :SybObjectname; 
    fdataset      :SybObjectname; 
    fdatafield    :SybObjectname; 
    fisprimarykey :boolean; 
    procedure setlength(value :smallint); 
    procedure Setdatatype(Value :SybObjectname); 
    procedure Setdataset(Value :SybObjectname); 
    procedure Setdatafield(Value :SybObjectname); 
    function getvalue:string; 
    procedure setvalue(value:string); 
    procedure Setisprimarykey(Value :boolean); 
  protected 
    { Protected declarations } 
  public 
    constructor Create(AOwner: TComponent); override; 
    destructor destroy; override; 
    procedure setname(const NewName:Tcomponentname); override; 
  published 
    property Datatype:SybObjectname read fdatatype write setdatatype; {fdatatype;} 
    property Length:smallint read flength write setlength; 
    property DataSet :SybObjectname read Fdataset write setdataset; 
    property DataField :SybObjectname read fdatafield write setdatafield; 
    property Value:string read getvalue write setvalue; 
    property IsPrimaryKey:boolean read fisprimarykey write setIsPrimaryKey stored false; 
  end; 
 
procedure Register; 
 
var from_create :boolean; 
 
implementation 
uses sybase_components,sybtable,sybquery; 
 
procedure Register; 
begin 
  RegisterPropertyEditor(TypeInfo(SybObjectname),Tsybmemo,'',Tsybobjectproperty); 
  RegisterComponents('Sybase DBLIB', [tsybmemo]); 
end; 
 
constructor Tsybmemo.Create(AOwner: TComponent); 
begin 
  inherited Create(AOwner); 
  setdatatype('text'); 
  from_create:=true; 
  fIsPrimaryKey:=false; 
  height:=90; 
  if fieldslist = nil then 
  begin 
    FieldsList:=TList.create; 
  end; 
end; 
 
destructor tsybmemo.destroy; 
var thisform  :tform; 
    i,j       :smallint; 
    asybtable :tsybtable; 
    asybquery :tsybquery; 
begin 
  thisform:=tform(owner); 
  for i := 0 to thisform.ComponentCount - 1 do 
  begin 
 
    if (thisform.Components[i] is TSybTable) 
      and (thisform.Components[i].name=dataset) then 
    begin 
      asybtable:=tsybtable(thisform.Components[i]); 
      asybtable.deletefield(name); 
      break; 
    end; 
    if (thisform.Components[i] is TSybQuery) 
      and (thisform.Components[i].name=dataset) then 
    begin 
      asybquery:=tsybquery(thisform.Components[i]); 
      asybquery.deletefield(name); 
      break; 
    end; 
 
  end; 
  fieldslist.remove(self); 
  inherited destroy; 
end; 
 
procedure Tsybmemo.Setisprimarykey(Value :boolean); 
begin 
  fisprimarykey:=value; 
end; 
 
function Tsybmemo.getvalue:string; 
begin 
  result:=text; 
end; 
 
procedure Tsybmemo.setvalue(value:string); 
begin 
  text:=value; 
end; 
 
procedure Tsybmemo.setname(const NewName:Tcomponentname); 
var oldname :Tcomponentname; 
    thisform  :tform; 
    i         :smallint; 
    asybtable :tsybtable; 
    asybquery :tsybquery; 
begin 
  oldname:=name; 
  thisform:=tform(owner); 
  inherited setname(NewName); 
  for i := 0 to thisform.ComponentCount - 1 do 
  begin 
    if (thisform.Components[i] is TSybTable) 
      and (thisform.Components[i].name=dataset) then 
    begin 
      asybtable:=tsybtable(thisform.Components[i]); 
      asybtable.deletefield(oldname); 
      asybtable.addfield(name); 
      break; 
    end; 
    if (thisform.Components[i] is TSybQuery) 
      and (thisform.Components[i].name=dataset) then 
    begin 
      asybquery:=tsybquery(thisform.Components[i]); 
      asybquery.deletefield(oldname); 
      asybquery.addfield(name); 
      break; 
    end; 
  end; 
 
  if fieldslist.indexof(self) = -1 then 
    fieldslist.add(self) 
  else 
  begin 
    fieldslist.items[fieldslist.indexof(self)]:=self; 
  end; 
 
end; 
 
procedure Tsybmemo.Setdatafield(Value :SybObjectname); 
begin 
  fdatafield:=value; 
end; 
 
procedure Tsybmemo.Setdatatype(Value :SybObjectname); 
begin 
  fdatatype:=value; 
end; 
 
procedure Tsybmemo.Setdataset(Value :SybObjectname); 
var thisform  :tform; 
    i,j       :smallint; 
    asybtable :tsybtable; 
    asybquery :tsybquery; 
begin 
  thisform:=tform(owner); 
 
  for i := 0 to thisform.ComponentCount - 1 do 
  begin 
    if (thisform.Components[i] is TSybTable) 
      and (thisform.Components[i].name=value) then 
    begin 
      asybtable:=tsybtable(thisform.Components[i]); 
      asybtable.deletefield(name); 
      break; 
    end; 
    if (thisform.Components[i] is TSybQuery) 
      and (thisform.Components[i].name=value) then 
    begin 
      asybQuery:=tsybQuery(thisform.Components[i]); 
      asybQuery.deletefield(name); 
      break; 
    end; 
  end; 
 
  Fdataset:=value; 
 
  for i := 0 to thisform.ComponentCount - 1 do 
  begin 
    if (thisform.Components[i] is TSybTable) 
      and (thisform.Components[i].name=value) then 
    begin 
      asybtable:=tsybtable(thisform.Components[i]); 
      asybtable.addfield(name); 
      break; 
    end; 
    if (thisform.Components[i] is TSybquery) 
      and (thisform.Components[i].name=value) then 
    begin 
      asybquery:=tsybquery(thisform.Components[i]); 
      asybquery.addfield(name); 
      break; 
    end; 
  end; 
 
end; 
 
procedure tsybmemo.setlength(value:smallint); 
begin 
  flength:=value; 
end; 
 
procedure Tsybobjectproperty.GetValues(TheProc: TGetStrProc); 
var i,j       :integer; 
    thisform  :tform; 
    teditf    :tsybmemo; 
    nm        :string; 
    asybtable :tsybtable; 
    asybquery :tsybquery; 
 
begin 
  teditf:=tsybmemo(getcomponent(0)); 
  thisform:=tform(teditf.owner); 
  if getname = 'DataSet' then 
  begin 
    for i := 0 to thisform.ComponentCount - 1 do 
    begin 
      with thisform.Components[i] do { as TControl) do} 
      begin 
        if thisform.Components[i] is TSybTable then 
         theproc(thisform.Components[i].name); 
        if thisform.Components[i] is TSybQuery then 
         theproc(thisform.Components[i].name); 
      end; 
    end; 
  end; 
  if getname = 'Datatype' then 
  begin 
    theproc('datetime'); 
    theproc('float'); 
    theproc('int'); 
    theproc('char'); 
    theproc('bit'); 
    theproc('text'); 
  end; 
  if getname = 'DataField' then 
  begin 
    for i := 0 to thisform.ComponentCount - 1 do 
    begin 
      if (thisform.Components[i] is TSybTable) 
        and (thisform.Components[i].name=teditf.dataset) then 
      begin 
        asybtable:=tsybtable(thisform.Components[i]); 
        for j:=1 to asybtable.datafieldscount do 
          theproc(asybtable.datafields[j]); 
      end; 
      if (thisform.Components[i] is TSybQuery) 
        and (thisform.Components[i].name=teditf.dataset) then 
      begin 
        asybquery:=tsybquery(thisform.Components[i]); 
        for j:=1 to asybquery.datafieldscount do 
          theproc(asybquery.datafields[j]); 
      end; 
    end; 
 
  end; 
 
end; 
 
function Tsybobjectproperty.getattributes:Tpropertyattributes; 
begin 
  Result := [paValueList,paAutoUpdate,paMultiSelect]; 
end; 
 
end.