django.db.utils.OperationalError: (1071, '指定的密钥太长；最大密钥长度为 767 字节')

django.db.utils.OperationalError: (1071, #39;Specified key was too long; max key length is 767 bytes#39;)(django.db.utils.OperationalError: (1071, 指定的密钥太长；最大密钥长度为 767 字节))

问题描述

我的模特:

class Course(models.Model):
    language = models.ForeignKey(Language)
    name = models.CharField(max_length=50, unique=True, default='course')
    title = models.CharField(max_length=1024, default='no title')
    foreign_title = models.CharField(max_length=1024, default='no title', blank=True)
    header = models.CharField(max_length=1024, default='', blank=True)
    description = models.TextField(null=True, blank=True)

    def __str__(self):
        return self.title

    def __unicode__(self):
        return u'%s' % self.title

我添加unique_together":

I am add "unique_together":

class Course(models.Model):
    language = models.ForeignKey(Language)
    name = models.CharField(max_length=50, unique=True, default='course')
    title = models.CharField(max_length=1024, default='no title')
    foreign_title = models.CharField(max_length=1024, default='no title', blank=True)
    header = models.CharField(max_length=1024, default='', blank=True)
    description = models.TextField(null=True, blank=True)

    class Meta:
        unique_together = ['language', 'name', 'title']

    def __str__(self):
        return self.title

    def __unicode__(self):
        return u'%s' % self.title

出现错误的迁移时间:

 django.db.utils.OperationalError: (1071, 'Specified key was too long; max key length is 767 bytes')

我的数据库是:mysql Ver 15.1 Distrib 10.0.17-MariaDB，用于 debian-linux-gnu (x86_64) 使用 readline 5.2

My DB is: mysql Ver 15.1 Distrib 10.0.17-MariaDB, for debian-linux-gnu (x86_64) using readline 5.2

我尝试增加mysql的索引长度:

I tried to increase the length of the index mysql:

MariaDB [(none)]> set global innodb_file_format = BARRACUDA;
Query OK, 0 rows affected (0.00 sec)

MariaDB [(none)]> set global innodb_large_prefix = ON;
Query OK, 0 rows affected (0.00 sec)

但这还不够:

django.db.utils.OperationalError: (1071, 'Specified key was too long; max key length is 3072 bytes')

问题索引长度.django索引如何指定长度限制?

The problem index length. How to specify the length limit Django index?

推荐答案

解决方案是

ALTER DATABASE `databasename` CHARACTER SET utf8; 

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