Sql Server中拆分一个字符串使用表

Question

我有一个字符串：Brand=b1-b2&Vendor=v1-v2-v3&CustomField=cf1-cf2-cf3

我想打一个表..

**Name**  | **Value** 
------------- | ------ 
Brand   | b1 
Brand   | b2 
Vendor  | v1 
Vendor  | v2 
Vendor  | v3 
CustomField | cf1 
CustomField | cf2 
CustomField | cf3 

感谢您的帮助

编辑注：我试过了，但我不认为它的性能

CREATE PROCEDURE [dbo].[SplitTableInStr] 
(
    @StrParameter NVARCHAR(MAX) 
) 
AS 
BEGIN 
    DECLARE @Delimiter CHAR = '&', 
      @Index SMALLINT, 
      @Start SMALLINT, 
      @DelSize SMALLINT; 

    SET @DelSize = LEN(@Delimiter); 

    CREATE TABLE #FilteredItems 
    (
     [Key] NVARCHAR(400), 
     [Values] NVARCHAR(MAX) 
    ) 

    WHILE LEN(@StrParameter) > 0 
    BEGIN 
     SET @Index = CHARINDEX(@Delimiter, @StrParameter) 
     IF @Index = 0 
      BEGIN 
       DECLARE @Key NVARCHAR(400) = SUBSTRING(@StrParameter, 1, CHARINDEX('=', @StrParameter) - 1); 
       DECLARE @Values NVARCHAR(MAX) = SUBSTRING(@StrParameter, CHARINDEX('=', @StrParameter) + 1, LEN(@StrParameter)); 

       INSERT INTO #FilteredItems ([Key],[Values]) 
       VALUES (@Key,@Values) 
       BREAK 
      END 
     ELSE 
      BEGIN 
       DECLARE @IndexItem NVARCHAR(MAX) = SUBSTRING(@StrParameter, 1, @Index - 1); 

       DECLARE @IndexKey NVARCHAR(400) = SUBSTRING(@IndexItem, 1, CHARINDEX('=', @IndexItem) - 1); 
       DECLARE @IndexValues NVARCHAR(MAX) = SUBSTRING(@IndexItem, CHARINDEX('=', @IndexItem) + 1, LEN(@IndexItem)); 

       INSERT INTO #FilteredItems ([Key],[Values]) 
       VALUES (@IndexKey,@IndexValues) 

       SET @Start = @Index + @DelSize 
       SET @StrParameter = SUBSTRING(@StrParameter, @Start , LEN(@StrParameter) - @Start + 1) 
      END 
    END 

    DECLARE @KeyBase NVARCHAR(400), 
      @ValueBase NVARCHAR(MAX); 

    CREATE TABLE #DisplayOrderTmp 
    (
     [EndName] NVARCHAR(400), 
     [EndValue] NVARCHAR(400) 
    ) 

    WHILE EXISTS(SELECT * From #FilteredItems) 
    BEGIN 
     SELECT TOP 1 @KeyBase = [Key], @ValueBase = [Values] FROM #FilteredItems 

     DECLARE @OptionDelimiter CHAR = '-', 
       @OptionIndex SMALLINT, 
       @OptionStart SMALLINT, 
       @OptionDelSize SMALLINT; 

     SET @OptionDelSize = LEN(@OptionDelimiter) 

     WHILE LEN(@ValueBase) > 0 
     BEGIN 
      SET @OptionIndex = CHARINDEX(@OptionDelimiter, @ValueBase) 

      IF @OptionIndex = 0 
       BEGIN 
        INSERT INTO #DisplayOrderTmp VALUES (@KeyBase, @ValueBase) 
        BREAK; 
       END 
      ELSE 
       BEGIN 
        INSERT INTO #DisplayOrderTmp VALUES (@KeyBase, SUBSTRING(@ValueBase, 1, CHARINDEX(@OptionDelimiter, @ValueBase) - 1)) 

        SET @OptionStart = @OptionIndex + @OptionDelSize 
        SET @ValueBase = SUBSTRING(@ValueBase, @OptionStart , LEN(@ValueBase) - @OptionStart + 1) 
       END 
     END 

     DELETE #FilteredItems WHERE [Key] = @KeyBase 
    END 

    SELECT * FROM #DisplayOrderTmp; 
END 

EXEC dbo.[SplitTableInStr] 'Brand=b1-b2&Vendor=v1-v2-v3&CustomField=cf1-cf2-cf3' 

Answer 1

使用CSV分配器表值函数由杰夫莫恩机智^ h cross apply()

declare @s nvarchar(4000) = 'Brand=b1-b2&Vendor=v1-v2-v3&CustomField=cf1-cf2-cf3'; 
select 
    Name = left(s.Item,charindex('=',s.Item)-1) 
    , Value = i.Item 
from dbo.DelimitedSplitN4k(@s,'&') s 
    cross apply dbo.DelimitedSplitN4k(replace(s.Item,'=','-'),'-') i 
where i.ItemNumber > 1 

rextester演示：http://rextester.com/RTAT28301

回报：

+-------------+------+ 
| Name  | Item | 
+-------------+------+ 
| Brand  | b1 | 
| Brand  | b2 | 
| Vendor  | v1 | 
| Vendor  | v2 | 
| Vendor  | v3 | 
| CustomField | cf1 | 
| CustomField | cf2 | 
| CustomField | cf3 | 
+-------------+------+ 

分割字符串参考：

• Tally OH! An Improved SQL 8K “CSV Splitter” Function - Jeff Moden
• Splitting Strings : A Follow-Up - Aaron Bertrand
• Split strings the right way – or the next best way - Aaron Bertrand
• string_split() in SQL Server 2016 : Follow-Up #1 - Aaron Bertrand

Answer 2

我想你应该为此获得与CLR函数（在C＃）的最佳性能：

https://msdn.microsoft.com/en-us/library/ms131103.aspx

你可以手动拆分输入或创建使用命名组编译正则表达式来解析输入值。