什么是mysql中的DC2Type数组类型

I have been working with Symfony2 and doctrine2 recently and have realized a peculiar datatype called DC2Type:array that certain Symfony2 Roles get saved as. To me it just looks like a serialized PHP array where a signifies the total number of elements, i is the array index.

我最近一直在使用Symfony2和doctrine2，并且已经实现了一种特殊的数据类型，称为DC2Type：数组，某些Symfony2角色被保存为。对我来说，它看起来像一个序列化的PHP数组，其中a表示元素的总数，i是数组索引。

The value looks like this:

值如下所示：

a:15:{i:0;s:32:"ROLE_SONATA_USER_ADMIN_USER_EDIT";i:1;s:32:"ROLE_SONATA_USER_ADMIN_USER_LIST";i:2;s:34:"ROLE_SONATA_USER_ADMIN_USER_CREATE";i:3;s:32:"ROLE_SONATA_USER_ADMIN_USER_VIEW";i:4;s:34:"ROLE_SONATA_USER_ADMIN_USER_DELETE";i:5;s:36:"ROLE_SONATA_USER_ADMIN_USER_OPERATOR";i:6;s:34:"ROLE_SONATA_USER_ADMIN_USER_MASTER";i:7;s:33:"ROLE_SONATA_USER_ADMIN_GROUP_EDIT";i:8;s:33:"ROLE_SONATA_USER_ADMIN_GROUP_LIST";i:9;s:35:"ROLE_SONATA_USER_ADMIN_GROUP_CREATE";i:10;s:33:"ROLE_SONATA_USER_ADMIN_GROUP_VIEW";i:11;s:35:"ROLE_SONATA_USER_ADMIN_GROUP_DELETE";i:12;s:37:"ROLE_SONATA_USER_ADMIN_GROUP_OPERATOR";i:13;s:35:"ROLE_SONATA_USER_ADMIN_GROUP_MASTER";i:14;s:10:"ROLE_ADMIN";}

I want to know what this datatype is?

我想知道这个数据类型是什么？

And what do the following identifier signifies:

以下标识符表示什么：

s:

I have searched the internet but haven't got any useful data.

我搜索过互联网但没有得到任何有用的数据。

I also bumped upon this cookbook entry - http://readthedocs.org/docs/doctrine-orm/en/2.0.x/cookbook/mysql-enums.html but didn't figure out the origin.

我还碰到了这本食谱条目 - http://readthedocs.org/docs/doctrine-orm/en/2.0.x/cookbook/mysql-enums.html但是没有找出原点。

2 个解决方案

#1

This is not a data type. You might have noticed that the column type is LONGTEXT. DC2Type:array is a comment of the field.

这不是数据类型。您可能已经注意到列类型是LONGTEXT。 DC2Type：array是该字段的注释。

Doctrine uses the field's comment as column's metadata storage place. Since Mysql does not allow you to store an array, Doctrine use DC2Type:array as comment in order to know how to unserialize the content.

Doctrine使用字段的注释作为列的元数据存储位置。由于Mysql不允许您存储数组，因此Doctrine使用DC2Type：array作为注释，以便了解如何反序列化内容。

Take a look at the link below.

看看下面的链接。

https://github.com/doctrine/dbal/issues/1614

From the link you mentioned, you can see that the comment DC2Type:enumvisibility indicates that the content of the field is a flag, indicating that the record is visible or not. It is not a new data type at all. It should be considered an helper strategy in the database level. For Doctrine, it's a custom data type.

从您提到的链接中，您可以看到注释DC2Type：enumvisibility指示该字段的内容是一个标志，表示该记录是否可见。它根本不是一种新的数据类型。它应该被视为数据库级别的帮助策略。对于Doctrine，它是一种自定义数据类型。

#2

This is simply a string. Its format is a serialized PHP array. The s: refers to the size or length of each item value in the array.

这只是一个字符串。它的格式是一个序列化的PHP数组。 s：指数组中每个项值的大小或长度。

e.g. s:32:"ROLE_SONATA_USER_ADMIN_USER_EDIT"

例如S：32： “ROLE_SONATA_USER_ADMIN_USER_EDIT”

If you count the characters in the ROLE string, there are 32.

如果计算ROLE字符串中的字符数，则为32。

Hope this helps.

希望这可以帮助。

#1