Question

我从前端收集了一个字符串，例如

string1 = "java, .net, oracle".

现在我想将此字符串与数据库示例中的字符串进行比较

string2 = "sql, oracle, wcf".

现在我想在SQL Server中以最简单的方式比较这些字符串，以便在将string1与string2进行比较时，因为“oracle”在两者之间是通用的，所以它将返回true。

我知道有一种方法可以根据分隔符String1拆分,，然后循环并逐个比较。但这看起来很漫长。 SQL Server中有没有可以执行此操作的功能？

Answer 1

您可以尝试使用两个与INNER JOIN结合的派生表：

DECLARE @s1 NVARCHAR(100)='java,.net,oracle';
DECLARE @s2 NVARCHAR(100)='some1,.net,java';

WITH s1Splitted AS
(
    SELECT LTRIM(RTRIM(A.B.value('.','nvarchar(max)'))) AS Part
    FROM
    (SELECT CAST('<x>' + REPLACE(@s1,',','</x><x>') + '</x>' AS XML) AS y) AS x
    CROSS APPLY x.y.nodes('/x') AS A(B)
)
,s2Splitted AS
(
    SELECT LTRIM(RTRIM(A.B.value('.','nvarchar(max)'))) AS Part
    FROM
    (SELECT CAST('<x>' + REPLACE(@s2,',','</x><x>') + '</x>' AS XML) AS y) AS x
    CROSS APPLY x.y.nodes('/x') AS A(B)
)

SELECT * 
FROM s1Splitted AS s1 
INNER JOIN s2Splitted AS s2 ON s1.Part=s2.Part

这可以轻松打包到内联表值函数中，您可以轻松调用

SELECT * FROM dbo.MyFunction(@s1,@s2);

注意

如果您期望包含三个邪恶字符的输入，则应将<, > and &替换为< > and &，否则XML拆分方法会中断......

修改

当你正在寻找任何平等的存在时，对结果的简单COUNT就足够了。您可以将您的函数声明为BIT并在函数级别上进行此评估，或者返回结果集（这将是我的方法）并在外部进行评估...

Answer 2

@roryap的评论正是您应该对数据库执行的操作。如果您无法执行此操作，则可以创建TVF或SP。这将把字符串作为参数，将其拆分为类似

的表

self.window.set_type_hint(Gdk.WINDOW_TYPE_HINT_DOCK)

然后使用xml或任何拆分函数，使表格看起来像这样：

string_to_table
java
.net
oracle

然后加入他们以获得你需要的东西。

Answer 3

如果您对某些动态SQL

持开放态度

我喜欢这个是它以降序返回HITS的数量

Declare @SearchStr varchar(max) ='Cappelletti , Production ,John'
Declare @TableName varchar(150) ='OD'
Declare @FieldName varchar(150) ='[OD-Title]'
Declare @Select    varchar(150) ='[OD-Nr],[OD-Title]'

Set @SearchStr = 'Sign(CharIndex('''+Replace(Replace(Replace(@SearchStr,' , ',','),', ',''),',',''','+@FieldName+'))+Sign(CharIndex(''')+''','+@FieldName+'))'
Declare @SQL nvarchar(Max) = 'Select * from (Select '+@Select+',Hits='+@SearchStr+' From '+@TableName + ') A Where Hits>0 Order by Hits Desc' 
Exec(@SQL)

返回

OD-Nr   OD-Title                    Hits
2       Cappelletti, John           2
3       Daily Production Summary    1

Answer 4

Declare @InputString Varchar(50) = 'java, .net, oracle'  --<-- String comming in

Declare @Table TABLE (Strings Varchar(50))               --<-- String in the Database
Insert Into @Table Values ('sql, oracle, wcf')

-- Convert to XML Input sting
declare @xml xml = N'<root><r>' + replace(@InputString, ',','</r><r>') + '</r></root>';



WITH DBString AS (

-- Split string stored in the database

SELECT  RTRIM(LTRIM(Split.a.value('.', 'VARCHAR(100)'))) Strings 
FROM   
    (SELECT Cast ('<X>' + Replace(Strings, ',', '</X><X>') + '</X>' AS XML) AS Data
    FROM    @Table
    ) AS t CROSS APPLY Data.nodes ('/X') AS Split(a) )
,InputStrings AS
  (

-- Split String coming in the parameter

    select RTRIM(LTRIM(r.value('.','varchar(max)'))) as InputString
    from @xml.nodes('//root/r') as records(r)
  )

-- Finally Compare the splitted  strings word by word

SELECT * , 'True' [Exist]
FROM InputStrings
WHERE EXISTS (SELECT 1 
              FROM DBString
              WHERE InputStrings.InputString = DBString.Strings)

如何比较SQL Server中具有相同分隔符的两个字符串

4 个答案:

注意

修改