They are created one stored procedure but i can't understand.

Question

They are created one stored procedure but i can't understand.if any know knows this stored procedure pls Explain what functionality the are used and tell me with examples.





SET QUOTED_IDENTIFIER ON
GO
SET ANSI_NULLS ON
GO




Create PROC SearchAndReplace
(
@SearchStr nvarchar(100),
@ReplaceStr nvarchar(100)
)
AS
BEGIN



SET NOCOUNT ON

DECLARE @TableName nvarchar(256), @ColumnName nvarchar(128), @SearchStr2 nvarchar(110), @SQL nvarchar(4000), @RCTR int
SET @TableName = ''
SET @SearchStr2 = QUOTENAME( @SearchStr ,'''')
SET @RCTR = 0

WHILE @TableName IS NOT NULL
BEGIN
SET @ColumnName = ''
SET @TableName =
(
SELECT MIN(QUOTENAME(TABLE_SCHEMA) + '.' + QUOTENAME(TABLE_NAME))
FROM INFORMATION_SCHEMA.TABLES
WHERE TABLE_TYPE = 'BASE TABLE'
ANDQUOTENAME(TABLE_SCHEMA) + '.' + QUOTENAME(TABLE_NAME) > @TableName
ANDOBJECTPROPERTY(
OBJECT_ID(
QUOTENAME(TABLE_SCHEMA) + '.' + QUOTENAME(TABLE_NAME)
), 'IsMSShipped'
) = 0
)

WHILE (@TableName IS NOT NULL) AND (@ColumnName IS NOT NULL) and (@TableName != 'eLogs_Master_Company')
BEGIN
SET @ColumnName =
(
SELECT MIN(QUOTENAME(COLUMN_NAME))
FROM INFORMATION_SCHEMA.COLUMNS
WHERE TABLE_SCHEMA= PARSENAME(@TableName, 2)
ANDTABLE_NAME= PARSENAME(@TableName, 1)
ANDDATA_TYPE IN ('char', 'varchar', 'nchar', 'nvarchar')
ANDQUOTENAME(COLUMN_NAME) > @ColumnName
)

IF @ColumnName IS NOT NULL
BEGIN
if(@TableName <> '[dbo].[eLogs_Master_Company]')

SET @SQL='UPDATE ' + @TableName +
' SET ' + @ColumnName
+ ' = REPLACE(' + @ColumnName + ', '
+ QUOTENAME(@SearchStr, '''') + ', ' + QUOTENAME(@ReplaceStr, '''') +
') WHERE ' + @ColumnName + ' = ' + @SearchStr2

EXEC (@SQL)
SET @RCTR = @RCTR + @@ROWCOUNT
END
END
END

SELECT CAST(@RCTR AS varchar)
END


GO
SET QUOTED_IDENTIFIER OFF
GO
SET ANSI_NULLS ON
GO



Thanks&Regs

Magesh.A