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用于存储布尔值的 MySQL 数据类型

Since MySQL doesn't seem to have any 'boolean' data type, which data type do you 'abuse' for storing true/false information in MySQL?

Especially in the context of writing and reading from/to a PHP script.

Over time I have used and seen several approaches:

  • tinyint, varchar fields containing the values 0/1,
  • varchar fields containing the strings '0'/'1' or 'true'/'false'
  • and finally enum Fields containing the two options 'true'/'false'.

None of the above seems optimal. I tend to prefer the tinyint 0/1 variant, since automatic type conversion in PHP gives me boolean values rather simply.

So which data type do you use? Is there a type designed for boolean values which I have overlooked? Do you see any advantages/disadvantages by using one type or another?

转载于:https://stackoverflow.com/questions/289727/which-mysql-data-type-to-use-for-storing-boolean-values

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  • perhaps? 2008-11-14 10:50
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    For MySQL 5.0.3 and higher, you can use BIT. The manual says:

    As of MySQL 5.0.3, the BIT data type is used to store bit-field values. A type of BIT(M) enables storage of M-bit values. M can range from 1 to 64.

    Otherwise, according to the MySQL manual you can use bool and boolean which are at the moment aliases of tinyint(1):

    Bool, Boolean: These types are synonyms for TINYINT(1). A value of zero is considered false. Non-zero values are considered true.

    MySQL also states that:

    We intend to implement full boolean type handling, in accordance with standard SQL, in a future MySQL release.

    References: http://dev.mysql.com/doc/refman/5.5/en/numeric-type-overview.html

    本回答被题主选为最佳回答 , 对您是否有帮助呢?
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