private CPQuery GetUpdateQueryCommand()
{
IEntityProxy proxy = this as IEntityProxy;
if (proxy == null)
{
throw new InvalidOperationException("请在调用BeginEdit()的返回值对象上调用Update方法。");
}
// 获取数据实体对象的主键值，如果数据实体没有指定主键，将会抛出一个异常
Tuple <string, object> rowKey = proxy.GetRowKey();
CPQuery update = GetUpdateQuery(rowKey);
if (update == null)
{
return(null);
}
CPQuery query = update
+ " WHERE " + rowKey.Item1 + " = " + new QueryParameter(rowKey.Item2);
proxy.ClearChangeFlags(); // 清除修改标记，防止多次调用
return(query);
}