[英]Creating a table using dynamic sql
我想在存儲過程中使用動態SQL來創建表。
這是對存儲過程的調用:
EXEC [spCreateAColDiffTable] 'hq193.dbo.arch_con_col_s193_s202'
以下是存儲過程的相關部分:
CREATE PROCEDURE sp_createAColDiffTable (@table_name nvarchar(128))
...
SET @sSQL = 'CREATE TABLE ' + @table_name + ' ( ' +
' [table_name] VARCHAR (128) NOT NULL, ' +
' [column_name] VARCHAR (128) NULL, ' +
' [what_changed] VARCHAR (128) NULL, ' +
' [sr_data_type] VARCHAR (128) NOT NULL, ' +
' [tr_data_type] VARCHAR (128) NOT NULL, ' +
' [sr_max_length] SMALLINT NOT NULL, ' +
' [tr_max_length] SMALLINT NOT NULL, ' +
' [sr_is_nullable] CHAR NULL, ' +
' [tr_is_nullable] CHAR NULL, ' +
' [sr_precision] SMALLINT NULL, ' +
' [tr_precision] SMALLINT NULL, ' +
' [sr_scale] SMALLINT NULL, ' +
' [tr_scale] SMALLINT NULL ) ' +
' ON [PRIMARY] WITH (DATA_COMPRESSION = NONE)'
PRINT @sSQL
Exec @sSQL
走
當我運行存儲過程時,我收到錯誤:
SQL Server數據庫錯誤:名稱'CREATE TABLE hq193.dbo.arch_con_col_s193_s202([table_name] VARCHAR(128)NOT NULL,[column_name] VARCHAR(128)NULL,[what_changed] VARCHAR(128)NULL,[sr_data_type] VARCHAR(128 )NOT NULL,[tr_data_type] VARCHAR(128)NOT NULL,[sr_max_length] SMALLINT NOT NULL,[tr_max_length] SMALLINT NOT NULL,[sr_is_nullable] CHAR NULL,[tr_is_nullable] CHAR NULL,[sr_precision] SMALLINT NULL,[tr_precision] SMALLINT NULL,[sr_scale] SMALLINT為NULL,[tr_scale] SMALLINT為NULL)ON [PRIMARY] WITH(DATA_COMPRESSION = NONE)'
不是有效的標識符。
請注意,在執行存儲過程之前,我打印出了SQL。 如果我將打印的SQL剪切並粘貼到查詢編輯器窗口中,它可以正常工作。
我錯過了什么?
試試這樣:
EXEC(@sSQL)
這是一個非常常見的錯誤。 如果沒有括號, EXEC @sSQL
意味着“ 執行名稱在@sSQL變量中的存儲過程 ”,而不是你想要的那樣“ 執行變量@sSQL中的命令字符串 ”。
我看到這是一個舊帖子,但我有一個類似的問題,我需要閱讀一個文本文件,其中列可能會根據文件的拉取方式而變化越來越少。 所以我編寫了一個程序來讀取文本文件並將其放入動態創建的臨時表中,我可以在其中處理輸出。
也許這可以幫助別人..
DECLARE @NUM_COL AS INT
DECLARE @I AS INT
DECLARE @CREATE_TBL AS NVARCHAR(MAX)
DECLARE @DATA AS NVARCHAR (MAX)
DECLARE @XML_ROW AS XML
DECLARE @MAX_CHAR AS INT
--Sets the column max characters for temp table ##FILE_TABLE
SET @MAX_CHAR = 1000
--File import of data as single rows, no columns
IF OBJECT_ID('tempdb..#FILE_ROWS') IS NOT NULL
DROP TABLE #FILE_ROWS
CREATE TABLE #FILE_ROWS
( [Row_data] NVARCHAR(MAX) NULL )
--Global temp table used because the table is being built dynamically.
IF OBJECT_ID('tempdb..##FILE_TABLE') IS NOT NULL
DROP TABLE ##FILE_TABLE
--This is only so the debugger thinks the table is created when referenced in later SQL code.
IF 1 <> 1 CREATE TABLE ##FILE_TABLE (X INT)
BULK INSERT #FILE_ROWS
FROM 'C:\Users\Wayne\Desktop\777434633016764.txt'
WITH
(
FIELDTERMINATOR = '\t' --Tab Delimited
,ROWTERMINATOR = '\n'
)
--Figures out how many columns were in the file.
SET @NUM_COL = (SELECT MAX(LEN(Row_data) - LEN(REPLACE(Row_data, CHAR(9), ''))) + 1 AS [NO_COL] FROM #FILE_ROWS)
SET @CREATE_TBL = 'CREATE TABLE ##FILE_TABLE ( ID INT IDENTITY(1,1),'
SET @I = 1
Declare COUNTER Cursor for
SELECT
CAST('<A>' + REPLACE(Row_data, CHAR(9), '</A><A>') + '</A>' AS XML)
FROM #FILE_ROWS
open COUNTER
fetch next from COUNTER into @XML_ROW
while @@fetch_Status != -1
begin
IF @I = 1
BEGIN
SELECT @CREATE_TBL = @CREATE_TBL
+ '[' + REPLACE(dbo.Trim(DATA.value('.','char(30)')), N'''', '`')
+ ']' + ' NVARCHAR(' + CAST(@MAX_CHAR AS NVARCHAR(5)) + ') NULL,'
FROM @XML_ROW.nodes('/A') AS x(DATA)
SET @CREATE_TBL = LEFT(@CREATE_TBL, LEN(@CREATE_TBL) - 1) + ')'
EXEC(@CREATE_TBL)
SET @I = 2
END
--ELSE --If you do not want the column names in the first row, remove the ELSE
BEGIN
SET @DATA = 'INSERT INTO ##FILE_TABLE SELECT '
SELECT @DATA = @DATA
+ '''' + REPLACE(dbo.Trim(DATA.value('.','char(30)')), N'''', '`')
+ '''' + ','
FROM @XML_ROW.nodes('/A') AS x(DATA)
SET @DATA = LEFT(@DATA, LEN(@DATA) -1)
EXEC(@DATA)
END
FETCH NEXT FROM COUNTER INTO @XML_ROW
END
CLOSE COUNTER
DEALLOCATE COUNTER
SELECT * from ##FILE_TABLE
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