Oracle根据字段值找到表名和列名

方法1：

--Oracle 根据字段值查询其所在的表、字段  
DECLARE  
CURSOR cur_query IS   
  SELECT table_name, column_name, data_type FROM user_tab_columns;   
  a NUMBER;   
  sql_hard VARCHAR2(2000);   
  vv NUMBER;  
BEGIN   
  FOR rec1 IN cur_query LOOP  
  a:=0;   
  IF rec1.data_type ='VARCHAR2' OR rec1.data_type='CHAR' THEN   
  a := 1;   
  END IF;   
  IF a>0 THEN   
  sql_hard := '';   
  sql_hard := 'SELECT count(*) FROM '|| rec1.table_name ||' where '   
  ||rec1.column_name|| ' like''吴芳''';--字段值   
  dbms_output.put_line(sql_hard);   
  EXECUTE IMMEDIATE sql_hard INTO vv;  
  IF vv > 0 THEN dbms_output.put_line('[字段值所在的表.字段]:['||rec1.table_name||'].['||rec1.column_name||']');   
  END IF;  
  END IF;  
  END LOOP;  
END;  

方法2：

DECLARE  
CURSOR cur_query IS  
  SELECT table_name, column_name, data_type FROM user_tab_columns;  
  a NUMBER;  
  sql_hard VARCHAR2(2000);  
  vv NUMBER;  
BEGIN  
  FOR rec1 IN cur_query LOOP  
  a:=0;  
  IF rec1.data_type ='NUMBER' THEN  
  a := 1;  
  END IF;  
  IF a>0 THEN  
  sql_hard := '';  
  sql_hard := 'SELECT COUNT(*) FROM  '|| rec1.table_name ||' WHERE '  
  ||rec1.column_name  
  || '=123456';--字段值  
  dbms_output.put_line(sql_hard);   
  EXECUTE IMMEDIATE sql_hard INTO vv;  
  IF vv > 0 THEN  
   dbms_output.put_line('[字段值所在的表.字段]:['||rec1.table_name||'].['||rec1.column_name||']');  
  END IF;   
  END IF;  
  END LOOP;  
END;  

SQLserver中如何实现

DECLARE @what varchar(800)  
SET @what='123456' --要搜索的字符串   
  
  
DECLARE @sql varchar(8000)   
  
  
DECLARE TableCursor CURSOR LOCAL FOR  
SELECT sql='IF EXISTS ( SELECT 1 FROM ['+o.name+']   
WHERE ['+c.name+'] LIKE ''%'+@what+'%'' ) PRINT ''[字段值所在的表.字段]：['+o.name+'].['+c.name+']'''  
FROM syscolumns c JOIN sysobjects o ON c.id=o.id   
  
  
-- 175=char 56=int 可以查 select * from sys.types   
WHERE o.xtype='U' AND c.status>=0 AND c.xusertype IN (175, 239, 231, 167 )   
OPEN TableCursor   
FETCH NEXT FROM TableCursor INTO @sql  
WHILE @@FETCH_STATUS=0  
BEGIN  
    EXEC( @sql )  
    FETCH NEXT FROM TableCursor INTO @sql  
END   
CLOSE TableCursor   
-- 删除游标引用  
DEALLOCATE TableCursor   

本位转载自：复制到这里只是怕连接失效哦！！！

http://blog.csdn.net/yangyi22/article/details/7555662