MYSQL中int（11）数据类型面临的问题 [英] Issues faced with int(11) datatype in MYSQL

问题描述

我在MYSQL中有一个表，主键id为int（11）（自动递增）。现在我有一个程序读取一些文本文件并在id列中输入值。
所以我的表应该包含：

I have a table in MYSQL in with a primary key id int(11) (auto-incremented). Now I have a program which reads some text file and enters the value in id column. So my table should contains :

id
897413
791783

但是会发生什么，我可以在我的桌子上找不到大数字。这是因为int（11）可以容纳的最大值吗？将int（11）增加到int（20）仍然面临同样的问题。我无法将数据类型更改为big int，因为我已经实现了很多代码。

But what happens is that, I can't find big numbers in my table. Is this because of maximum value that int(11) can hold? Increased int(11) to int(20) still facing same problem. I can't change the datatype to big int as I have already implemented a lot of code.

编辑：
我试图插入一条带id的记录as 523826，它在DB中保存为450258.为什么会这样？

I tried to insert a single record with id as 523826 and it got saved in DB as 450258. Why so?

推荐答案

int 的dev.mysql.com/doc/refman/5.0/en/numeric-type-overview.html\"rel =noreferrer> mysql手册数据类型：

Definition from mysql manual for the int data type:

正常大小的整数。符号范围是-2147483648到2147483647.无符号范围是0到4294967295。

A normal-size integer. The signed range is -2147483648 to 2147483647. The unsigned range is 0 to 4294967295.

int type总是4个字节（32位）。 int（11）中的 11 只是显示宽度，只对 UNSIGNED ZEROFILL 列。有关此博文的详细信息。

The int type is always 4 bytes (32 bits). The 11 in int(11) is just the "display width", that only matters for UNSIGNED ZEROFILL columns. More details on this blog post.

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