Question

我有示例数据：

表：tblsampledata

create table tblsampledata
(
    column1 varchar(50),
    column2 varchar(50)
);

insert into tblsampledata values('Bob Frapples','Gail Forcewind');
insert into tblsampledata values('Paul Molive','Mario Speedwagon');

我有带有表名的列映射表：

表：tblmapping

create table tblmapping
(
    tblname varchar(100),
    columnmap varchar(max)
);

insert into tblmapping values('tblsampledata','[column1]|[column2]');

注意：我想在表tblmapping的表名tblname中拆分存在的列数据，并将其存储到临时表中。

预期结果：#TempTable

column1     column2
---------------------
Bob         Gail
Frapples    Forcewind
Paul        Mario
Molive      Speedwagon

Answer 1

您需要使用动态查询来实现这一目标。

您可以尝试以下操作。

{
    "error": {
        "statusCode": 500,
        "name": "Error",
        "message": "Error trying login and get user Context. Error: Error trying to enroll user. Error: Enrollment failed with errors [[{\"code\":20,\"message\":\"Authorization failure\"}]]",
        "stack": "Error: Error trying login and get user Context. Error: Error trying to enroll user. Error: Enrollment failed with errors [[{\"code\":20,\"message\":\"Authorization failure\"}]]\n    at HLFConnection.login (/home/composer/.npm-global/lib/node_modules/composer-rest-server/node_modules/composer-connector-hlfv1/lib/hlfconnection.js:477:30)\n    at <anonymous>\n    at process._tickCallback (internal/process/next_tick.js:189:7)"
    }
}

Online Demo

要拆分第1列和第2列，可以使用如下查询。

select @xml = Cast(( '<X>' + Replace(columnmap, '|', '</X><X>') + '</X>' ) AS XML) 
from tblmapping where tblname =@tablename


DECLARE @query AS NVARCHAR(max) = 'select ' +  Stuff((SELECT DISTINCT ', ' + value
            FROM   (
            SELECT n.value('.', 'varchar(100)') AS value 
            FROM   @xml.nodes('X') AS T(n)
        )t
            FOR xml path(''), type).value('.', 'NVARCHAR(MAX)'), 1, 1, '') 
                  + ' from ' + @tablename; 
exec sp_executesql @query

Full Demo使用动态查询

拆分多列并存储到临时表中

1 个答案: