query1.active:=false;
query1.sql.clear;
query1.sql.text:='SELECT Nombre,Apellido, edad, Sexo, Semestre FROM Estudiantes WHERE Cedula=:ced';
query1.parambyname('ced').asstring:=edit2.text;
query1.active:=true;
edit1.text:=query1.fieldbyname('Nombre').asstring;
label1.caption:=query1.fieldbyname('apellido').asstring;