识别 Sybase 表、字段、键、约束

2022-01-20 00:00:00 key foreign-keys primary-key sybase sysobjects

我正在尝试设置一个 Sybase 查询，它将给我以下输出:

I'm trying to set up a Sybase query that will give me the following output:

Table     KeyType      KeyNumber      Column
table1    PK           1              table1_id
table1    FK           2              table2_id    
table1    FK           3              table3_id
table1    FK           4              table4_id
table1    Unique       5              table1_abc
table1    Unique       5              table1_def

换句话说，我需要每个表的 PK，它拥有的每个外键，以及每个唯一键(不是一个键具有多个元素的情况，例如上面的唯一键，这是由具有相同的 KeyNumber).

In other words, I need the PK for each table, and every foreign key it has, as well as every unique key (not where a key has more than one element, such as the unique key above, this is identified by having the same KeyNumber).

我猜我需要使用 sysobject、syscolumns、syskeys 和 sysconstraints，但我似乎无法弄清楚它们是如何相互关联的.

I'm guessing I need to use sysobject, syscolumns, syskeys and sysconstraints but I can't seem to figure out how they interlink.

谢谢
卡尔

推荐答案

这是一个开始:

SELECT 
    t.name, 
    CASE k.type 
        WHEN 1 THEN 'PK' 
        WHEN 2 THEN 'FK'
        WHEN 3 THEN 'Common'
    END,
    c.name
FROM 
    sysobjects t INNER JOIN 
    syscolumns c ON c.id = t.id INNER JOIN
    syskeys k ON k.id = t.id AND c.colid IN (k.key1, k.key2, k.key3, k.key4, k.key5, k.key6, k.key7, k.key8)
WHERE 
    t.type = 'U' AND k.type in (1,2)

它不包括键 ID，因为我猜你可以以某种方式散列非空表 ID 和 keyN 列来为键生成唯一 ID.

It does not include the key ID, for that I guess you could somehow hash the non-null table ID and keyN columns to produce a unique ID for the key.

它也不包括唯一索引.为此，您可能希望 UNION 使用以下内容:

It also does not include unique indexes. For that you would want to UNION with something along the lines of:

SELECT 
    t.name, 
    'Unique',
    c.name
FROM 
    sysobjects t INNER JOIN 
    syscolumns c ON c.id = t.id INNER JOIN
    sysindexes i ON i.id = t.id
WHERE t.type = 'U'

查看 sysindexes 的 Sybase 手册页关于如何过滤它.

Check out the Sybase manual page for sysindexes on how to filter it.

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