Question

我正在使用AdventureWorks2008R2数据库，我试图弄清楚是否有办法遍历此数据库中的所有表，然后给出条件迭代特定列中的行那张桌子？

目前我有

SELECT DISTINCT
INFORMATION_SCHEMA.COLUMNS.ORDINAL_POSITION,TABLE_SCHEMA, TABLE_NAME, COLUMN_NAME
 FROM INFORMATION_SCHEMA.COLUMNS 
WHERE COLUMN_NAME LIKE ('%date%') AND COLUMN_NAME Not LIKE '%JobCandidate%'
;

我想从这里做的是查看这些表格，然后根据给定条件更改日期。

在非SQL代码和松散的伪代码中，它可能类似于

FOR TABLES 
SELECT A TABLE WITH A COLUMN THAT HAS A DATE IN IT 
FOR COLUMN_WITH_DATE_HEADER
IF ROW HAS DATE GIVEN SOME CONDITION 
UPDATE ROW IN THAT TABLE

有人可以协助吗？

提前致谢！

更新

这是我从@Mars解决方案中创建的代码。

SELECT DISTINCT
IDENTITY(int,1,1) AS SN,
INFORMATION_SCHEMA.COLUMNS.ORDINAL_POSITION
 , TABLE_SCHEMA
 , TABLE_NAME
 , COLUMN_NAME
INTO #temptable
FROM INFORMATION_SCHEMA.COLUMNS 
WHERE COLUMN_NAME LIKE ('%date%') 
AND COLUMN_NAME Not LIKE '%JobCandidate%' AND 
COLUMN_NAME NOT LIKE '%BirthDate%';

  DECLARE @start INT=1
, @end INT=0
, @query NVARCHAR(MAX)='';
DECLARE @conditions NVARCHAR(MAX)='' ;


SELECT @end=MAX(SN)
FROM #temptable
WHILE (@start<=@end)
BEGIN
    SELECT  
    @conditions = ' WHERE ' + 'YEAR('+ COLUMN_NAME +')' + ' < 2009',
    @query= 'UPDATE '+TABLE_SCHEMA+'.' 
            +TABLE_NAME +' SET '+ COLUMN_NAME
            +' = dateadd(YEAR,8,' + COLUMN_NAME + ')'      
    FROM #temptable
    WHERE SN =@start
    EXEC (@query)
    SET @start+=1
END

DROP TABLE #temptable

Answer 1

您需要设置更新所需的日期和条件以检查变量@updatatingDate和@conditions

SELECT DISTINCT
IDENTITY(int,1,1) AS SN,
INFORMATION_SCHEMA.COLUMNS.ORDINAL_POSITION
 , TABLE_SCHEMA
 , TABLE_NAME
 , COLUMN_NAME
INTO #temptable
FROM INFORMATION_SCHEMA.COLUMNS 
WHERE COLUMN_NAME LIKE ('%date%') 
AND COLUMN_NAME Not LIKE '%JobCandidate%';

  DECLARE @start INT=1
, @end INT=0
, @query NVARCHAR(MAX)=''
, @updatatingDate NVARCHAR(100)='2017-04-04'
, @conditions NVARCHAR(MAX)='1=1'

SELECT @end=MAX(SN)
FROM #temptable
WHILE (@start<=@end)
BEGIN
    SELECT 
    @query= 'UPDATE '+TABLE_SCHEMA+'.' 
            +TABLE_NAME +' SET '+ COLUMN_NAME
            +' ='''+@updatatingDate+''' WHERE '
            +@conditions
    FROM #temptable
    WHERE SN =@start
    EXEC (@query)
    SET @start+=1
END
--DROP TABLE #temptable;

如何根据条件迭代数据库中的表然后这些表行？

1 个答案: