表上的 SQLite 多主键，其中之一是自动增量 [英] SQLite multi-Primary Key on a Table, one of them is Auto Increment

问题描述

我在一张表上有多个(复合)主键，其中一个是自动递增的.然而，有趣的是 SQLite 允许在强制性 PRIMARY KEY 关键字之后使用 AUTOINCREMENT 关键字.

I have multiple (composite) primary keys on a table and one of them will be auto increment. However, interestingly SQLite allows usage of AUTOINCREMENT keyword just after an obligatory PRIMARY KEY keyword.

我的查询是:

CREATE TABLE ticket (
     id INTEGER PRIMARY KEY AUTOINCREMENT,
     seat TEXT, payment INTEGER,
     PRIMARY KEY (id, seat))

然而错误是table "ticket"有多个主键.

实际上我可以避免此表的其他主键.但是我正在编写一个 ORM 框架(是的，我疯了)并且不想更改表的 PRIMARY KEY 约束生成的结构(因为它在 MySQL afaik 中是允许的).

Actually I can avoid other primary keys for this table. But I am coding an ORM framework (hell yeah I'm crazy) and do not want to change structure of PRIMARY KEY constraint generation for a table (because it is allowed in MySQL afaik).

有什么解决办法吗?

推荐答案

不，我不认为这是可能的.

No, I don't think this is possible.

您可以创建一个 UNIQUE INDEX，其效果与 PRIMARY KEY 基本相同:

You can create a UNIQUE INDEX which has essentially the same effect as a PRIMARY KEY:

CREATE UNIQUE INDEX pk_index ON "table1"("field1","field2");

此外，我看不到您架构的逻辑，即 -> 如果一列是自动增量并且您不打算手动弄乱这些值，无论如何它都会是唯一的，所以它很简单短主键.为什么要复合?不过，您可能有充分的理由在列组合上创建另一个索引.

Besides, I fail to see the logic of your schema, that is -> if a column is autoincrement and you don't intend to mess with the values manually, it's going to be unique anyway, so it makes a good simple short primary key. Why the composite? You may have good reasons to make another index on the combination of columns, though.

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