Question

我想找出SQL Server中在某些表中查找某些字符的最佳方法。你能告诉我哪个是循环通过一组表/列的最好的方法，只使用SQL命令（存储过程......）找到一些字符？

提前致谢。

示例：

选择表/列组：

SELECT t.name AS table_name
, c.name AS column_name
--, ty.Name
FROM sys.tables AS t
INNER JOIN sys.columns c ON t.OBJECT_ID = c.OBJECT_ID
INNER JOIN sys.types ty ON c.user_type_id = ty.user_type_id
where ty.Name = 'uniqueidentifier'

选择

 table_name                 column_name
 formset_details_translation    formset_details_translation_id
 formset_details_translation    formset_version_id
 current_schema_instances       original_unique_guid

...

寻找循环。我该怎么用？光标？

for each Table
    For each Column
        select * 
        from tableI
        where columnI = 'XXXX...XXXX'
    End For
End For

Answer 1

你正在看什么？

DECLARE @cnt INT,@ID int = 1
Declare @TempTable table(ID int IDENTITY(1,1), table_name varchar(200), column_name varchar(200))

Insert into @TempTable
SELECT t.name AS table_name
, c.name AS column_name
FROM sys.tables AS t
INNER JOIN sys.columns c ON t.OBJECT_ID = c.OBJECT_ID
INNER JOIN sys.types ty ON c.user_type_id = ty.user_type_id
where ty.Name = 'uniqueidentifier'

Select @cnt =  count(1) from @TempTable
Declare @sql varchar(max), @table_name varchar(200), @column_name varchar(200) 
WHILE @ID <= @cnt
BEGIN

 SET @sql = ''
 SET @table_name = ''
 SET @column_name = ''
 Select @table_name = table_name,@column_name = column_name from @TempTable where ID = @ID
 SET @sql = 'select * from ' + @table_name + ' where ' + @column_name + ' = 123' --You can replace 123 by your text

 PRINT (@sql) -- You can write EXECUTE (@sql) here to execute it


 SET @ID = @ID + 1
END

Answer 2

这需要一些手动工作，但你可以这样：

select
    TABLE_CATALOG, TABLE_SCHEMA, TABLE_NAME, COLUMN_NAME, DATA_TYPE, CHARACTER_MAXIMUM_LENGTH,
    cmd = 'select ''' + table_name + ''' as tabname, ''' + column_name + ''' as colname, count(*) as rows from [' + TABLE_CATALOG + '].[' + TABLE_SCHEMA  + '].[' +  TABLE_NAME + '] where [' + COLUMN_NAME + '] like ''%%'' union all '
from INFORMATION_SCHEMA.COLUMNS
where 1=1
    and DATA_TYPE like '%char'
    and TABLE_NAME like '%%'

然后您只需执行生成的查询（更改选择以更好地满足您的需求并删除最后一个union all）。同一个表中每列的结果将位于不同的行中，但您可以使用FOR XML PATH生成OR语句，这样它就不会返回搜索列重复的相同行。

如果您需要这是动态的，无需复制和粘贴，请检查此未记录的过程：

sp_msforeachtable @command1="declare @x Nvarchar(255); set @x='select count(*) from ?'; execute sp_executesql @x"

使用@command1在information_schema.columns中构建您的查询，就像之前的示例一样。

循环通过一组表

2 个答案: