Mysql2 2：：Error: BLOB、TEXT、几何学或JSON列'body‘不能有默认值

Question

我有移民：

lass ChangeDefaultValueBodyForBlogPosts < ActiveRecord::Migration
  def up
    change_column :blog_posts, :body, :text, :null => false
    change_column :comments, :text, :text, :null => false
  end

  def down
    change_column :comments, :text, :text, :default => nil
    change_column :blog_posts, :body, :text, :default => nil
  end
end

rake db:迁移显示错误：

错误: BLOB、TEXT、几何图形或JSON列'body‘不能有默认值: ALTER blog_posts CHANGE body body text默认值’NOT NULL/home/user/projects/projectname/db/migrate/20120508203410_change_default_value_body_for_blog_posts.rb:3:in‘`up'

我用的是ubuntu 16.04，

mysql服务器5.7(版本: 5.7.12-0ubuntu1.1版本: 5.7.12-0ubuntu1版本: 5.7.11-0ubuntu6 )

我看了谷歌，解决这个问题需要改变

sql-mode="STRICT_TRANS_TABLES，NO_AUTO_CREATE_USER，NO_ENGINE_SUBSTITUTION“

至

sql-mode="NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION"

但是my.conf文件是空的。

#
# The MySQL database server configuration file.
#
# You can copy this to one of:
# - "/etc/mysql/my.cnf" to set global options,
# - "~/.my.cnf" to set user-specific options.
# 
# One can use all long options that the program supports.
# Run program with --help to get a list of available options and with
# --print-defaults to see which it would actually understand and use.
#
# For explanations see
# http://dev.mysql.com/doc/mysql/en/server-system-variables.html

#
# * IMPORTANT: Additional settings that can override those from this file!
#   The files must end with '.cnf', otherwise they'll be ignored.
#

!includedir /etc/mysql/conf.d/
!includedir /etc/mysql/mysql.conf.d/

如何解决这个问题，请帮助。谢谢。

Answer 1

您需要找到正确的my.cnf：

sudo find / -name "*.cnf"

/etc/mysql/mysql.conf.d/mysqld.cnf
/etc/mysql/my.cnf
/etc/mysql/mysql.cnf
/etc/mysql/conf.d/mysqldump.cnf
/etc/mysql/conf.d/mysql.cnf

我编辑了/etc/mysql/mysql.conf/mysqld.cnf

strace mysql ";" 2>&1  | grep cnf

stat("/etc/my.cnf", 0x7ffda9472660)     = -1 ENOENT (No such file or directory)
stat("/etc/mysql/my.cnf", {st_mode=S_IFREG|0644, st_size=683, ...}) = 0
open("/etc/mysql/my.cnf", O_RDONLY)     = 3
stat("/etc/mysql/conf.d/mysql.cnf", {st_mode=S_IFREG|0644, st_size=8, ...}) = 0
open("/etc/mysql/conf.d/mysql.cnf", O_RDONLY) = 4
stat("/etc/mysql/conf.d/mysqldump.cnf", {st_mode=S_IFREG|0644, st_size=55, ...}) = 0
open("/etc/mysql/conf.d/mysqldump.cnf", O_RDONLY) = 4
stat("/etc/mysql/mysql.conf.d/mysqld.cnf", {st_mode=S_IFREG|0644, st_size=3034, ...}) = 0
open("/etc/mysql/mysql.conf.d/mysqld.cnf", O_RDONLY) = 4
stat("/etc/mysql/mysql.conf.d/mysqld_safe_syslog.cnf", {st_mode=S_IFREG|0644, st_size=21, ...}) = 0
open("/etc/mysql/mysql.conf.d/mysqld_safe_syslog.cnf", O_RDONLY) = 4
stat("/root/.my.cnf", 0x7ffda9472660)   = -1 ENOENT (No such file or directory)
stat("/root/.mylogin.cnf", 0x7ffda9472660) = -1 ENOENT (No such file or directory)

找到正确的文件后，在mysqld语句下面添加sql-mode="NO_AUTO_CREATE_USER，NO_ENGINE_SUBSTITUTION"“

Answer 2

我找到了解决方案:需要添加my.cnf

[mysqld]
sql-mode="NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION"

Answer 3

在本地机器上使用xampp的mysql进行迁移没有问题。只有在生产服务器上，它才开始失败。我发现xampp运行的是mariadb而不是普通的mysql。因此，在服务器上使用mariaDB解决了我的问题。