SQL Server，将字符串中的字符替换为表中的值

Question

如何用表中的值替换字符串中的值？

例如，

    select *
into #t
from 
(
    select 'bla'c1,'' c2 union all
    select 'table'c1,'TABLE' c2 union all
    select 'value'c1,'000' c2 union all
    select '...'c1,'' c2
)t1

declare @s nvarchaR(max)='this my string and i want to replace all values that are in table #t'

我的表中有一些值，我想用字符串中的C2替换C1。

结果应该是

这是我的字符串，我想替换表#T

中的所有000

中的所有000 我用CLR解决了问题

using System;
using Microsoft.SqlServer.Server;
using System.Data.SqlTypes;
using System.Data.Linq;

namespace ReplaceValues
{
    public partial class Functions
    {
        [SqlFunction
            (
                //DataAccess = DataAccessKind.Read,
                SystemDataAccess = SystemDataAccessKind.Read
            )
        ]
        public static string ReplaceValues(string row, string delimitator, string values, string replace/*, bool CaseSensitive*/)
        {
            //return row;
            string[] tmp_values = values.Split(new string[] { delimitator }, StringSplitOptions.None);
            string[] tmp_replace = replace.Split(new string[] { delimitator }, StringSplitOptions.None);

            row = row.ToUpper();

            for (int i = 0; i < Math.Min(tmp_values.Length, tmp_replace.Length); i++)
            {
                row = row.Replace(tmp_values[i].ToUpper(), tmp_replace[i]);
            }

            return row;
        }

    }
}

，然后

select *
into #t
from 
(
    select 'value1'OldValue,'one'NewValue union all
    select 'value2'OldValue,'two'NewValue union all
    select 'value3'OldValue,'three'NewValue union all
    select 'value4'OldValue,'four'NewValue
)t1


select dbo.ReplaceValues(t1.column,'|',t2.v,t2.r)
from MyTable t1
cross apply
(
    select dbo.inlineaggr(i1.OldValue,'|',1,1)v,
           dbo.inlineaggr(i1.NewValue,'|',1,1)r
    from #t i1
)t2

我必须对其进行改进，以更好地管理案件敏感，但性能还不错。 （也是“ inlineaggr”是我几年前写的CLR）

Answer 1

您可以通过递归执行此操作。假设您有一个发现对的表，则可以编号行，然后使用递归CTE：

create table #t(c1 nvarchar(100), c2 nvarchar(100));
insert into #t(c1, c2) values
('bla', ''),
('table', 'table'),
('value', '000'),
('...', '');

declare @s nvarchar(max) = 'this my string and i want to replace all values that are in table #t';

with ncte as (
    select row_number() over (order by (select null)) as rn, *
    from #t
), rcte as (
    select rn, replace(@s, c1, c2) as newstr
    from ncte
    where rn = 1

    union all

    select ncte.rn, replace(rcte.newstr, ncte.c1, ncte.c2)
    from ncte
    join rcte on ncte.rn = rcte.rn + 1
)
select *
from rcte
where rn = 4