定位

多字段

ADOTable1.Locate('id;age',VarArrayOf(['108',21]),[loPartialKey]);

单字段

ADOTable1.Locate('id','108',[loPartialKey]);

Lookup与定位类似

单字段

var v:Variant;
begin

//根据ID，返回姓名

   v:=ADOTable1.Lookup('id','108','age');
   if VarType(v) <> varNull then
   begin
     ShowMessage(IntToStr(v));
   end;
end;

多字段

var v:Variant;
begin

//根据ID，姓名，搜索，返回姓名，年龄
   v:=ADOTable1.Lookup('id;age',VarArrayOf(['108',21]),'name;age');

if VarType(v) <> varNull then
   begin
     ShowMessage(v[0]+inttostr(v[1]));
   end;
end;

循环

with ADOTable1 do
begin
DisableControls;
First;
while not eof do
begin
    ShowMessage(Fields[1].Value);
    Next;
end;
EnableControls;
end;