怎么做一个简单的图书管理的数据库

1.增加
dw_edit.reset()
dw_edit.settransobject(sqlca)
//dw_list.settransobject(sqlca)
dw_edit.insertrow(0)
cb_save.enabled    =    true
cb_delete.enabled    =    false
2.删除
dw_edit.setitem(dw_edit.getrow(),"state",-1)
cb_save.triggerevent(clicked!)
cb_save.enabled    = false
3.保存
integer li_i
dw_edit.accepttext()
for li_i=1 to dw_edit.rowcount()
    if trim(dw_edit.getitemstring(li_i,"name"))=""  or isnull(dw_edit.getitemstring(li_i,"name")) then
        messagebox("系统提示","第" +string(li_i)+"行分组名称为空")   
      dw_edit.setrow(li_i)
        dw_edit.setcolumn("name")
        dw_edit.setfocus()
        return
    end if        
next

if dw_edit.update()=1 then
    commit using sqlca;
    cb_find.triggerevent(clicked!)
    dw_list.retrieve("%%")
    dw_edit.reset()
    this.enabled    =    false
    cb_delete.enabled    =    false
else
    rollback using sqlca;
    messagebox("系统提示","保存数据失败，请仔细检查数据")
end if
4.退出
close(parent)