sql server, replace chars in string with values in table - sql

Question

how can i replace values in string with values that are in a table?
for example
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'
i have some values in my table and i want to replace C1 with C2 in my string.
the results should be
this my string and i want to replace all 000 that are in TABLE #t
UPDATE:
i solved with a CLR
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;
}
}
}
and then
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
i have to improved it to manage better the case sensitive, but performance are not bad.
(also 'inlineaggr' is a CLR i wrote years ago)

Answer 1

You can do this via recursion. Assuming you have a table of find-replace pairs, you can number the rows and then use recursive 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