MySQL 类型文本的最大长度

2021-11-20 00:00:00 database mysql

我正在创建一个用于发送私人消息的表单，并希望将 textarea 的 maxlength 值设置为适合我的 MySQL 数据库中 text 字段的最大长度桌子.类型文本字段可以存储多少个字符?

I'm creating a form for sending private messages and want to set the maxlength value of a textarea appropriate to the max length of a text field in my MySQL database table. How many characters can a type text field store?

如果很多，我是否可以像使用 varchar 一样在数据库文本类型字段中指定长度?

If a lot, would I be able to specify length in the database text type field as I would with varchar?

推荐答案

查看最大数量:http://dev.mysql.com/doc/refman/5.0/en/storage-requirements.html

TINYBLOB, TINYTEXT       L + 1 bytes, where L < 2^8    (255 Bytes)
BLOB, TEXT               L + 2 bytes, where L < 2^16   (64 Kilobytes)
MEDIUMBLOB, MEDIUMTEXT   L + 3 bytes, where L < 2^24   (16 Megabytes)
LONGBLOB, LONGTEXT       L + 4 bytes, where L < 2^32   (4 Gigabytes)

L 是文本字段中的字节数.所以文本的最大字符数是 216-1(使用单字节字符).表示 65 535 个字符(使用单字节字符).

L is the number of bytes in your text field. So the maximum number of chars for text is 216-1 (using single-byte characters). Means 65 535 chars(using single-byte characters).

UTF-8/MultiByte 编码:使用 MultiByte 编码每个字符可能会占用超过 1 个字节的空间.对于 UTF-8，每个字符的空间消耗在 1 到 4 个字节之间.

UTF-8/MultiByte encoding: using MultiByte encoding each character might consume more than 1 byte of space. For UTF-8 space consumption is between 1 to 4 bytes per char.

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