Jiansen Lu
SP for Searching and finding a string value in all columns in a table
July 15th 2008 04:23
Searching and finding a string value in all columns in a table
Problem
Sometimes there is a need to find if a string value exists in any column in your table. Although there are system stored procedures that do a "for each database" or a "for each table", there is not a system stored procedure that does a "for each column". So trying to find a value in any column in your database requires you to build the query to look through each column you want to search using an OR operator between each column. Is there any way this can be dynamically generated?
Solution
Once again this is where T-SQL comes in handy along with the use of system tables or system views. The code below allows you to search for a value in all text data type columns such as (char, nchar, ntext, nvarchar, text and varchar).
The stored procedure gets created in the master database so you can use it in any of your databases and it takes three parameters:
stringToFind - this is the string you are looking for. This could be a simple value as 'test' or you can also use the % wildcard such as '%test%', '%test' or 'test%'.
schema - this is the schema owner of the object
table - this is the table name you want to search, the procedure will search all char, nchar, ntext, nvarchar, text and varchar columns in the table
The first thing you need to do is create this stored procedure by copying the below code and executing it in a query window.
USE master
GO
CREATE PROCEDURE sp_FindStringInTable @stringToFind VARCHAR(100), @schema sysname, @table sysname
AS
DECLARE @sqlCommand VARCHAR(8000)
DECLARE @where VARCHAR(8000)
DECLARE @columnName sysname
DECLARE @cursor VARCHAR(8000)
BEGIN TRY
SET @sqlCommand = 'SELECT * FROM ' @schema '.' @table ' WHERE'
SET @where = ' '
SET @cursor = 'DECLARE col_cursor CURSOR FOR SELECT COLUMN_NAME
FROM ' DB_NAME() '.INFORMATION_SCHEMA.COLUMNS
WHERE TABLE_SCHEMA = ''' @schema '''
AND TABLE_NAME = ''' @table '''
AND DATA_TYPE IN (''char'',''nchar'',''ntext'' ,''nvarchar'',''text'',''varc har'')'
EXEC (@cursor)
OPEN col_cursor
FETCH NEXT FROM col_cursor INTO @columnName
WHILE @@FETCH_STATUS = 0
BEGIN
IF @where <> ''
SET @where = @where ' OR'
SET @where = @where ' ' @columnName ' LIKE ''' @stringToFind ''''
FETCH NEXT FROM col_cursor INTO @columnName
END
CLOSE col_cursor
DEALLOCATE col_cursor
SET @sqlCommand = @sqlCommand @where
--PRINT @sqlCommand
EXEC (@sqlCommand)
END TRY
BEGIN CATCH
PRINT 'There was an error'
IF CURSOR_STATUS('variable', 'col_cursor') <> -3
BEGIN
CLOSE col_cursor
DEALLOCATE col_cursor
END
END CATCH
Once the stored procedure has been created you can run some tests.
Problem
Sometimes there is a need to find if a string value exists in any column in your table. Although there are system stored procedures that do a "for each database" or a "for each table", there is not a system stored procedure that does a "for each column". So trying to find a value in any column in your database requires you to build the query to look through each column you want to search using an OR operator between each column. Is there any way this can be dynamically generated?
Solution
Once again this is where T-SQL comes in handy along with the use of system tables or system views. The code below allows you to search for a value in all text data type columns such as (char, nchar, ntext, nvarchar, text and varchar).
The stored procedure gets created in the master database so you can use it in any of your databases and it takes three parameters:
stringToFind - this is the string you are looking for. This could be a simple value as 'test' or you can also use the % wildcard such as '%test%', '%test' or 'test%'.
schema - this is the schema owner of the object
table - this is the table name you want to search, the procedure will search all char, nchar, ntext, nvarchar, text and varchar columns in the table
The first thing you need to do is create this stored procedure by copying the below code and executing it in a query window.
USE master
GO
CREATE PROCEDURE sp_FindStringInTable @stringToFind VARCHAR(100), @schema sysname, @table sysname
AS
DECLARE @sqlCommand VARCHAR(8000)
DECLARE @where VARCHAR(8000)
DECLARE @columnName sysname
DECLARE @cursor VARCHAR(8000)
BEGIN TRY
SET @sqlCommand = 'SELECT * FROM ' @schema '.' @table ' WHERE'
SET @where = ' '
SET @cursor = 'DECLARE col_cursor CURSOR FOR SELECT COLUMN_NAME
FROM ' DB_NAME() '.INFORMATION_SCHEMA.COLUMNS
WHERE TABLE_SCHEMA = ''' @schema '''
AND TABLE_NAME = ''' @table '''
AND DATA_TYPE IN (''char'',''nchar'',''ntext'' ,''nvarchar'',''text'',''varc har'')'
EXEC (@cursor)
OPEN col_cursor
FETCH NEXT FROM col_cursor INTO @columnName
WHILE @@FETCH_STATUS = 0
BEGIN
IF @where <> ''
SET @where = @where ' OR'
SET @where = @where ' ' @columnName ' LIKE ''' @stringToFind ''''
FETCH NEXT FROM col_cursor INTO @columnName
END
CLOSE col_cursor
DEALLOCATE col_cursor
SET @sqlCommand = @sqlCommand @where
--PRINT @sqlCommand
EXEC (@sqlCommand)
END TRY
BEGIN CATCH
PRINT 'There was an error'
IF CURSOR_STATUS('variable', 'col_cursor') <> -3
BEGIN
CLOSE col_cursor
DEALLOCATE col_cursor
END
END CATCH
Once the stored procedure has been created you can run some tests.
| 66 |
| Vote |
Add To: 
subscribe to this blog
