SQLite唯一的键，包含两列的组合。

I'm trying to make sure when I run the following query only the first INSERT INTO will work.. I know I have to make slot UNIQUE

我试图确保当我运行下面的查询时，只有第一次插入才会生效。我知道我必须使插槽独一无二

The slot could be from 0-5 INTEGER but it doesn't mean that only 6 table data rows could be accepted into that table.

槽可以是0-5的整数，但这并不意味着只能接受6个表数据行到该表中。

For each playerHash that matches it should only allow 6 table data rows as slot is UNIQUE (cannot have duplicate of same slot column, for each playerHash column).

对于每个匹配的playerHash，它应该只允许6个表数据行，因为slot是惟一的(每个playerHash列不能有相同的slot列重复)。

//Below Query Should Pass
INSERT INTO Buying(itemId, amount, price, bought, slot, playerHash) VALUES (1, 1, 1, 1, 1, 1);
//Below Query Should Fail
INSERT INTO Buying(itemId, amount, price, bought, slot, playerHash) VALUES (1, 1, 1, 1, 1, 1);
//Below Query Should Pass
INSERT INTO Buying(itemId, amount, price, bought, slot, playerHash) VALUES (1, 1, 1, 1, 1, 2);
//Below Query Should Fail
INSERT INTO Buying(itemId, amount, price, bought, slot, playerHash) VALUES (1, 1, 1, 1, 1, 2);
//Below Query Should Pass
INSERT INTO Buying(itemId, amount, price, bought, slot, playerHash) VALUES (1, 1, 1, 1, 0, 2);

Problem of course is they all pass and cause duplicate entries

当然，问题是它们都通过并导致重复的条目

Currently I use this table DDL

目前我使用这个表DDL

CREATE TABLE Buying ( 
    id         INTEGER PRIMARY KEY AUTOINCREMENT,
    itemId     INTEGER NOT NULL,
    amount     INTEGER NOT NULL,
    price      INTEGER NOT NULL,
    bought     INTEGER NOT NULL,
    collected  INTEGER NOT NULL
                       DEFAULT ( 0 ),
    overpaid   INTEGER NOT NULL
                       DEFAULT ( 0 ),
    slot       INTEGER NOT NULL,
    aborted    BOOLEAN NOT NULL
                       DEFAULT ( 0 ),
    playerHash INTEGER NOT NULL 
);

1 个解决方案

#1

Add to your ddl

添加到您的ddl

create table ... ( ...
...,
unique(slot, player));