MySql 字符串类型 - text

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  • text 长文本类型 适用于存储“较长的文本内容”,比如文章内容。最长可存储65535个字符。 如果还需要存储更长的京本,可以使用 mediumtext (1600万左右)或 longtext (40亿左右)。 设定形式:字段名称 text text 类型的字段不能设置默认值。 text 类型虽然是字符类型,但是不能设置长度!!!
mysql> create table article (id int auto_increment primary key, title varchar(100), author varchar(20), content text, pub_time datetime, edit_time timestamp);
mysql> desc article;
+-----------+--------------+------+-----+-------------------+-----------------------------+
| Field     | Type         | Null | Key | Default           | Extra                       |
+-----------+--------------+------+-----+-------------------+-----------------------------+
| id        | int(11)      | NO   | PRI | NULL              | auto_increment              |
| title     | varchar(100) | YES  |     | NULL              |                             |
| author    | varchar(20)  | YES  |     | NULL              |                             |
| content   | text         | YES  |     | NULL              |                             |
| pub_time  | datetime     | YES  |     | NULL              |                             |
| edit_time | timestamp    | NO   |     | CURRENT_TIMESTAMP | on update CURRENT_TIMESTAMP |
+-----------+--------------+------+-----+-------------------+-----------------------------+

mysql> insert into article (title, author, content, pub_time) values ('文章标题', '张三', '文章内容', '2020-8-8 20:00:00');
mysql> select * from article;
+----+--------------+--------+--------------+---------------------+---------------------+
| id | title        | author | content      | pub_time            | edit_time           |
+----+--------------+--------+--------------+---------------------+---------------------+
|  1 | 文章标题     | 张三   | 文章内容     | 2020-08-08 20:00:00 | 2020-07-06 18:00:54 |
+----+--------------+--------+--------------+---------------------+---------------------+

mysql> insert into article (title, author, content, pub_time) values ('文章标题', '李四', '文章内容', now());
mysql> select * from article;
+----+--------------+--------+--------------+---------------------+---------------------+
| id | title        | author | content      | pub_time            | edit_time           |
+----+--------------+--------+--------------+---------------------+---------------------+
|  1 | 文章标题     | 张三   | 文章内容     | 2020-08-08 20:00:00 | 2020-07-06 18:00:54 |
|  2 | 文章标题     | 李四   | 文章内容     | 2020-07-06 18:01:54 | 2020-07-06 18:01:54 |
+----+--------------+--------+--------------+---------------------+---------------------+