【简记】mysql alter主键类型int-＞bigint

alter

命令：

alter table `test` modify column `id` bigint(20) NOT NULL;
alter table `test1` modify column `id` bigint(20) NOT NULL;
alter table `test2` modify column `id` bigint(20) NOT NULL;

修改前：

desc test;

+-------------------------+--------------+------+-----+---------+----------------+
| Field                   | Type         | Null | Key | Default | Extra          |
+-------------------------+--------------+------+-----+---------+----------------+
| id                      | int(11)      | NO   | PRI | NULL    | auto_increment |
| name                    | varchar(255) | NO   | UNI | NULL    |                |

修改后：

desc test;

+-------------------------+--------------+------+-----+---------+-------+
| Field                   | Type         | Null | Key | Default | Extra |
+-------------------------+--------------+------+-----+---------+-------+
| id                      | bigint(20)   | NO   | PRI | NULL    |       |
| name                    | varchar(255) | NO   | UNI | NULL    |       |