Note that in the demo project I also added a secondUniqueConstraintwith three fields and no condition, and that works like a charm (test cases there to prove). That second constraint actually show the pattern that I use in the main project, which is to have an unique constraint on three...
本文介绍 django.db.models.UniqueConstraint.condition 的用法。 声明 UniqueConstraint.condition 一个 Q 对象,用于指定您希望约束强制执行的条件。 例如: UniqueConstraint(fields=['user'], condition=Q(status='DRAFT'), name='unique_draft_user') 确保每个用户只有一份草稿。 这些条件与 Index.condition 具有...
概述:UniqueConstraint rises fields.E310 error because of issue with no backward compatibility with unique_together→fields.E310-E311 should take into account UniqueConstraints without conditions. 版本:2.2→master Agreed, both checks should take intoUniqueConstraint's withoutcondition's. ...
# 需要导入模块: from django.db import models [as 别名]# 或者: from django.db.models importUniqueConstraint[as 别名]deftest_add_meta_conditional_multicolumn_unique_constraint__ok():withcmp_schema_editor()aseditor: editor.add_constraint(Model, models.UniqueConstraint( fields=('field1','field2'...
2) Single condition 唯一条件 例句>> 3) constraint condition reduction 约束条件的约简4) uniqueness constraint 唯一性约束 1. On the construction of matching matrix and the computation of matching strength,we apply disparity constraint,local relative disparity constraint and uniqueness constraint to ...
ADD and SUBTRACT depending on the condition is CASE STATEMENT ADD COLUMN to variable table? Add prefix in data column Add Time in SQL HH:MM:SS to another HH:MM:SS Adding a column to a large (100 million rows) table with default constraint adding a extra column in a pivot table created...
使用UniqueConstraint的Django IntegrityError 在Django中,UniqueConstraint是一种用于确保数据库表中某个字段或字段组合的唯一性的约束。当使用UniqueConstraint时,如果插入或更新数据时违反了唯一性约束,Django会抛出IntegrityError异常。 UniqueConstraint可以应用于模型的Meta类中,通过定义constraints属性来指定。下面是一个示例:...
unique constraint(BASEQH.PK_SYS_FILE)violated 选择语言:从中文简体中文翻译英语日语韩语俄语德语法语阿拉伯文西班牙语葡萄牙语意大利语荷兰语瑞典语希腊语捷克语丹麦语匈牙利语希伯来语波斯语挪威语乌尔都语罗马尼亚语土耳其语波兰语到中文简体中文翻译英语日语韩语俄语德语法语阿拉伯文西班牙语葡萄牙语意大利语荷兰语瑞典语...
aFinally, he fought for maintenance of farm interests 终于,他为维护农厂利益战斗了 [translate] a午睡之后感觉非常清醒 After midday nap feels extremely soberly [translate] aORA-00001: unique constraint (ZDYW.SYS_C0054159) violated ORA-00001 : (ZDYW.SYS_C0054159)被违犯的独特的限制 [translate] ...
You have created two (invalid) user records with the same name. The first thing to do here is to ensure the integrity of your data. When using validates_uniqueness_of you should always have a unique key constraint on the column in your database. E.g. when you are validating the unique...