MySQL - 添加约束一次用不同的情况添加两次

Question

当我向MySQL表添加约束时,我有这种奇怪的行为:

[...] add constraint qrtz_blob_triggers_ibfk_1 foreign key [...]

现在SHOW CREATE TABLE显示两次约束:

CONSTRAINT `qrtz_blob_triggers_ibfk_1` FOREIGN KEY [...]
CONSTRAINT `QRTZ_BLOB_TRIGGERS_ibfk_1` FOREIGN KEY [...]

这是完整的会话:

mysql> DROP DATABASE IF EXISTS my_test; CREATE DATABASE my_test default character set utf8 collate utf8_bin;
Query OK, 2 rows affected (0.07 sec)

Query OK, 1 row affected (0.00 sec)

mysql> use my_test;
Database changed
mysql> 
mysql> DROP TABLE IF EXISTS `QRTZ_TRIGGERS`;
Query OK, 0 rows affected, 1 warning (0.00 sec)

mysql> 
mysql> CREATE TABLE `QRTZ_TRIGGERS` (
       `TRIGGER_NAME` varchar(80) NOT NULL,
       `TRIGGER_GROUP` varchar(80) NOT NULL,
       PRIMARY KEY (`TRIGGER_NAME`,`TRIGGER_GROUP`)
     ) ENGINE=InnoDB DEFAULT CHARSET=utf8;
Query OK, 0 rows affected (0.08 sec)

mysql> 
mysql> DROP TABLE IF EXISTS `QRTZ_BLOB_TRIGGERS`;
Query OK, 0 rows affected, 1 warning (0.00 sec)

mysql> 
mysql> create table `QRTZ_BLOB_TRIGGERS` (`TRIGGER_NAME` varchar(80) not null, `TRIGGER_GROUP` varchar(80) not null, `BLOB_DATA` longblob, primary key (`TRIGGER_NAME`, `TRIGGER_GROUP`)) ENGINE=InnoDB DEFAULT CHARSET=utf8;
Query OK, 0 rows affected (0.08 sec)

mysql> 
mysql> alter table `QRTZ_BLOB_TRIGGERS`  add index qrtz_blob_triggers_ibfk_1 (`TRIGGER_NAME`, `TRIGGER_GROUP`), add constraint qrtz_blob_triggers_ibfk_1 foreign key (`TRIGGER_NAME`, `TRIGGER_GROUP`) references `QRTZ_TRIGGERS` (`TRIGGER_NAME`, `TRIGGER_GROUP`) ON UPDATE RESTRICT ON DELETE RESTRICT;
Query OK, 0 rows affected (0.18 sec)
Records: 0  Duplicates: 0  Warnings: 0

mysql> 
mysql> show create table QRTZ_BLOB_TRIGGERS \G
*************************** 1. row ***************************
       Table: QRTZ_BLOB_TRIGGERS
Create Table: CREATE TABLE `QRTZ_BLOB_TRIGGERS` (
  `TRIGGER_NAME` varchar(80) NOT NULL,
  `TRIGGER_GROUP` varchar(80) NOT NULL,
  `BLOB_DATA` longblob,
  PRIMARY KEY (`TRIGGER_NAME`,`TRIGGER_GROUP`),
  KEY `qrtz_blob_triggers_ibfk_1` (`TRIGGER_NAME`,`TRIGGER_GROUP`),
  CONSTRAINT `qrtz_blob_triggers_ibfk_1` FOREIGN KEY (`TRIGGER_NAME`, `TRIGGER_GROUP`) REFERENCES `QRTZ_TRIGGERS` (`TRIGGER_NAME`, `TRIGGER_GROUP`),
  CONSTRAINT `QRTZ_BLOB_TRIGGERS_ibfk_1` FOREIGN KEY (`TRIGGER_NAME`, `TRIGGER_GROUP`) REFERENCES `QRTZ_TRIGGERS` (`TRIGGER_NAME`, `TRIGGER_GROUP`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8
1 row in set (0.00 sec)

运用

[...] add constraint QRTZ_BLOB_TRIGGERS_ibfk_1 foreign key [...]

工作良好.

我正在使用Ubuntu 12.04 LTS和MySQL 5.5:

mysql-server-5.5     5.5.32-0ubuntu0.12.04.1

有没有人知道那里发生了什么？

Answer 1

这是一个已知错误，已在即将发布的版本中修复中修复：

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InnoDB 将重命名包含字符串 \xe2\x80\x9c ibfk的用户定义的外键约束InnoDB 将重命名名称中

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错误报告建议在版本 5.1.72、5.5.32、5.6.14、5.7.2 中进行修复，但我怀疑 5.5 分支存在拼写错误。考虑到发布日期，我预计 v5.5 中会修复该问题。34 .

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