关键字 SQL Server 存储过程

Question

我对 SQL Server 相当陌生，但我必须编写一个存储过程，该过程将使用关键字列表搜索特定表，并且假设返回找到命中的行，我编写了一个有效的查询但问题是当我必须修改关键字列表时，我必须从头开始编写查询。

查询如下

SELECT * 
INTO [playground].[dbo].[New table name] 
FROM [playground].[dbo].[Main table]
WHERE [Document Type Description] LIKE 'Alcohol' 
   OR [Document Type Description] LIKE 'DSTV' 
   OR [Document Type Description] LIKE 'Entertainment' OR
[Document Type Description]like'Bday' OR
[Document Type Description]like'Birthday' OR
[Document Type Description]like'Bar' OR
[Document Type Description]like'Booze' OR
[Document Type Description]like'Catering' OR
[Document Type Description]like'Farewell' OR
[Document Type Description]like'Food' OR
[Document Type Description]like'Function' OR
[Document Type Description]like'Meals' OR
[Document Type Description]like'Year end functions' OR
[Document Type Description]like'Womens day' OR
[Document Type Description]like'Womans day' OR
[Document Type Description]like'Tuck shop' OR
[Document Type Description]like'Teambuilding' OR
[Document Type Description]like'Refreshment' OR
[Document Type Description]like'Liquor' OR
[Document Type Description]like'Lunch' OR
[Document Type Description]like'Water' OR
[Document Type Description]like'Bread' OR
[Document Type Description]like'Breakaway' OR
[Document Type Description]like'Canteen' OR
[Document Type Description]like'Gifts' OR
[Document Type Description]like'Glass' OR
[Document Type Description]like'Glasses' OR
[Document Type Description]like'Glassware' OR
[Document Type Description]like'Ticket' OR
[Document Type Description]like'Rugby' OR
[Document Type Description]like'Cricket' OR
[Document Type Description]like'Tea cups' OR
[Document Type Description]like'Tea' OR
[Document Type Description]like'Sugar bowl' OR
[Document Type Description]like'Sugar' OR
[Document Type Description]like'Soup bowls' OR
[Document Type Description]like'Side plate' OR
[Document Type Description]like'Serving tray' OR
[Document Type Description]like'Saucers' OR
[Document Type Description]like'Tray' OR
[Document Type Description]like'Non slip tray' OR
[Document Type Description]like'Milk' OR
[Document Type Description]like'Milk jug' OR
[Document Type Description]like'Mugs' OR
[Document Type Description]like'Dessert' OR
[Document Type Description]like'Dessert spoons' OR
[Document Type Description]like'Dinner set' OR
[Document Type Description]like'Jug' OR
[Document Type Description]like'Kent' OR
[Document Type Description]like'Knifes' OR
[Document Type Description]like'Knives' OR
[Document Type Description]like'Cooler boxes' OR
[Document Type Description]like'Crockery' OR
[Document Type Description]like'Christmas' OR
[Document Type Description]like'Coffee' OR
[Document Type Description]like'Popcorn machine' OR
[Document Type Description]like'Cooler' OR
[Document Type Description]like'Freezer' OR
[Document Type Description]like'Fridge' OR
[Document Type Description]like'Fan ' OR
[Document Type Description]like'Extraction fan' OR
[Document Type Description]like'Heaters' OR
[Document Type Description]like'Water cooler' OR
[Document Type Description]like'Washing machine' OR
[Document Type Description]like'Warmer' OR
[Document Type Description]like'Vacuum cleaner' OR
[Document Type Description]like'Urn' OR
[Document Type Description]like'Thermostat'

最终我希望我有一个 SP 可以读取关键字数组并让我选择要在主表中搜索的表列

希望这是有道理的 提前谢谢你

Answer 1

关于您的代码的一些想法。

LIKE的使用
您放置查询的方式实际上执行相等性检查，因为您在 LIKE 语句中没有放置通配符。这会导致两个问题：

1. 您可能无法获得预期的结果
2. 您可能没有使用索引（这会加快处理速度），因为您使用的是LIKE

首先，您需要决定是否要检查是否相等，或者搜索的字段是否应该包含您正在查找的字符串。

如果要进行相等检查，请使用

... WHERE [Field] = 'value'

而不是

... WHERE [Field] LIKE 'value'

平等检查
有几种方法可以加快它们的速度。您可以将搜索词放在一个表格中并执行以下操作：

... WHERE [Field] in (SELECT Term FROM TableOfSearchTerms)

或者您甚至可以尝试将这两个表连接在一起。那么你根本不需要WHERE 子句：

... FROM Table1 t1 INNER JOIN TableOfSearchTerms terms ON terms.Term = t1.[Field]

使搜索字段动态化
这并不容易。您可以将动态 SQL 语句创建为字符串，然后使用EXEC 执行此操作，但必须注意不要引入问题（如 SQL 注入等）。

执行实际的LIKE
在这种情况下，您需要在语句中使用通配符，如下所示：

... WHERE [Field] LIKE `%searchterm%`

使用我上面所说的东西来解决这个问题并不容易。在那种情况下（尽管说起来让我很伤心），组装一个包含查询的字符串并使用EXEC 执行它可能是最简单的。结果可能如下所示：

DECLARE @query NVARCHAR(max)
SET @query = "INSERT INTO ... WHERE ";

EXEC (@query)

您可以使用搜索词表上的光标将所需的LIKEs 添加到WHERE 子句中。