[英]How do I fill an entire column in mysql with hash generated from username in that row
我到目前为止的查询是:
create table users_csv_import
(
username varchar(255),
reg_link varchar(255)
);
insert into users_csv_import (username, reg_link)
values ('kns2184', 'NULL');
insert into users_csv_import (username, reg_link)
values ('kns2185', 'NULL');
insert into users_csv_import (username, reg_link)
values ('kns2186', 'NULL');
insert into users_csv_import (username, reg_link)
values ('kns2187', 'NULL');
insert into users_csv_import (username, reg_link)
values ('kns2188', 'NULL');
update users_csv_import
set reg_link = md5(username in row should go here?)
where reg_link='NULL';
因此,我想为每一行从该行的用户名生成md5哈希。 我不想使用php循环,我想通过mysql进行此操作,因为我认为它会比通过php生成的哈希数组快得多。
只需按照您在帖子中所说的(几乎)即可:
update users_csv_import
set reg_link = md5(username)
where reg_link IS NULL;
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