Wie übergeben Sie Variable in der Bulk-Openrowset-Syntax?

Question

Wie eine Variable an den Massen openrowset Befehl übergeben?

SELECT * 
FROM OPENROWSET(BULK @filename, SINGLE_BLOB) AS x; 

Ich muss einen Dateipfad dynamisch an den openrowset Befehl übergeben.

Answer 1

Ich glaube nicht, dass Sie können. Ich glaube, dass Sie dynamisch sql wie im folgenden Beispiel verwenden müssen:

DECLARE @FileNameWithPath VARCHAR(max) 
DECLARE @FileText VARCHAR(max) 
DECLARE @FileId INTEGER 
DECLARE @DynamicSQLMask AS NVARCHAR(max); 
DECLARE @DynamicSQL AS NVARCHAR(max); 
DECLARE @dynamicparamdec AS NVARCHAR(max); 

--This is a string we'll use for our SQL Command. 
-- The ''##FileAndPath##'' is a target string we will replace as we loop 
-- over the file. 
SET @DynamicSQLMask = ' SELECT @output = BulkColumn 
      FROM OPENROWSET(BULK ''##FileAndPath##'', SINGLE_BLOB) AS x' 

DECLARE #MyCursor CURSOR FAST_FORWARD 
FOR 
SELECT x.FileId 
FROM Files x 


OPEN #MyCursor 

FETCH #MyCursor 
INTO @FileId 

WHILE @@fetch_status = 0 
BEGIN 
    BEGIN TRY 

    -- This is setup to read a number of files. This is where you would 
    -- Set the filename with path each time in the loop. For Example 
    -- Select @FileNameWithPath = 'C:\temp\myfile.txt' 

    SELECT @FileNameWithPath = FT.[DataFilesPath] + '\' + Finfo.X12FileName 
    ,  @DoNotProcess = FInfo.X12Fields 
    FROM Files x 
    WHERE x.FileId = @FileId 

    -- Here we are building the SQL we're going to execute. Sticking with 
    -- The example, @FileNameAndPath would hold 'C:\Temp\myfile.txt' 
    -- So it would replace '##FileAndPath##' 'C:\Temp\Myfile.txt'. 
    -- At which point @DynamicSQL would hold 
    -- ' SELECT @output = BulkColumn 
    --  FROM OPENROWSET(BULK ''C:\Temp\Myfile.txt'', SINGLE_BLOB) AS x' 

    SELECT @DynamicSQL = replace(@DynamicSQLMask, '##FileAndPath##', 
    @FileNameWithPath) 

    -- This is where you're setting up a parameter for our dynamic SQL. 
    -- It is an output parameter so it would return the text it reads from 
    -- the file. Read up on sp_ExecuteSql and passing parameters 
    -- if this part is confusing. 
    SET @dynamicparamdec = '@output varchar(max) output' 

    EXECUTE sp_executesql @DynamicSQL 
    ,      @dynamicparamdec 
    ,      @FileText OUTPUT 


    -- Here we store the contents of the file we read into a table. 
    UPDATE Files 
    SET [FileText] = @FileText 
    WHERE FileId = @FileId 
    END TRY 

    BEGIN CATCH 
    select 'load failed code here' 
    END CATCH 

    FETCH #MyCursor 
    INTO @FileId 
END -- End the Cursor Loop. 

--Close the cursor, if it is empty then deallocate it: 
IF (
    SELECT CURSOR_STATUS('global', '#MyCursor') 
    ) >= - 1 
BEGIN 
    IF (
     SELECT CURSOR_STATUS('global', '#MyCursor') 
     ) > - 1 
    BEGIN 
     CLOSE #MyCursor 
    END 

    DEALLOCATE #MyCursor 
END