如何在MsSQL中做一个简单的“查找和replace”？
问题相当自我解释。 我想做一个简单的查找和replace，就像在文本编辑器中对数据库的一列中的数据（MS Windows Server 2003上的MsSQL）
以下查询用b字符replace每个字符。
UPDATE YourTable SET Column1 = REPLACE(Column1,'a','b') WHERE Column1 LIKE '%a%'
这在SQL Server 2003上不起作用。
像这样：
BEGIN TRANSACTION; UPDATE table_name SET column_name=REPLACE(column_name,'text_to_find','replace_with_this'); COMMIT TRANSACTION;
示例：用<a …replace<script …以消除javascript漏洞
BEGIN TRANSACTION; UPDATE testdb SET title=REPLACE(title,'script','a'); COMMIT TRANSACTION;
这指出我在正确的方向，但我有一个数据库，起源于MSSQL 2000，仍然使用ntext数据types的列我replace。 当你尝试运行这种types的REPLACE时，你会得到这个错误：
参数数据typesntext对replace函数的参数1无效。
如果列数据适合nvarchar ，最简单的解决方法是在replace期间转换列。 从接受的答案中借用代码：
UPDATE YourTable SET Column1 = REPLACE(cast(Column1 as nvarchar(max)),'a','b') WHERE Column1 LIKE '%a%'
这对我来说是完美的。 感谢这个论坛post，我find了修复。 希望这可以帮助别人！
以下内容将查找并replace连接到的实例的每个表上的每个数据库（不包括系统数据库）中的string：
只需将'Search String'更改为任何您要查找的内容，然后'Replace String'即可。
--Getting all the databases and making a cursor DECLARE db_cursor CURSOR FOR SELECT name FROM master.dbo.sysdatabases WHERE name NOT IN ('master','model','msdb','tempdb') -- exclude these databases DECLARE @databaseName nvarchar(1000) --opening the cursor to move over the databases in this instance OPEN db_cursor FETCH NEXT FROM db_cursor INTO @databaseName WHILE @@FETCH_STATUS = 0 BEGIN PRINT @databaseName --Setting up temp table for the results of our search DECLARE @Results TABLE(TableName nvarchar(370), RealColumnName nvarchar(370), ColumnName nvarchar(370), ColumnValue nvarchar(3630)) SET NOCOUNT ON DECLARE @SearchStr nvarchar(100), @ReplaceStr nvarchar(100), @SearchStr2 nvarchar(110) SET @SearchStr = 'Search String' SET @ReplaceStr = 'Replace String' SET @SearchStr2 = QUOTENAME('%' + @SearchStr + '%','''') DECLARE @TableName nvarchar(256), @ColumnName nvarchar(128) SET @TableName = '' --Looping over all the tables in the database WHILE @TableName IS NOT NULL BEGIN DECLARE @SQL nvarchar(2000) SET @ColumnName = '' DECLARE @result NVARCHAR(256) SET @SQL = 'USE ' + @databaseName + ' SELECT @result = MIN(QUOTENAME(TABLE_SCHEMA) + ''.'' + QUOTENAME(TABLE_NAME)) FROM [' + @databaseName + '].INFORMATION_SCHEMA.TABLES WHERE TABLE_TYPE = ''BASE TABLE'' AND TABLE_CATALOG = ''' + @databaseName + ''' AND QUOTENAME(TABLE_SCHEMA) + ''.'' + QUOTENAME(TABLE_NAME) > ''' + @TableName + ''' AND OBJECTPROPERTY( OBJECT_ID( QUOTENAME(TABLE_SCHEMA) + ''.'' + QUOTENAME(TABLE_NAME) ), ''IsMSShipped'' ) = 0' EXEC master..sp_executesql @SQL, N'@result nvarchar(256) out', @result out SET @TableName = @result PRINT @TableName WHILE (@TableName IS NOT NULL) AND (@ColumnName IS NOT NULL) BEGIN DECLARE @ColumnResult NVARCHAR(256) SET @SQL = ' SELECT @ColumnResult = MIN(QUOTENAME(COLUMN_NAME)) FROM [' + @databaseName + '].INFORMATION_SCHEMA.COLUMNS WHERE TABLE_SCHEMA = PARSENAME(''[' + @databaseName + '].' + @TableName + ''', 2) AND TABLE_NAME = PARSENAME(''[' + @databaseName + '].' + @TableName + ''', 1) AND DATA_TYPE IN (''char'', ''varchar'', ''nchar'', ''nvarchar'') AND TABLE_CATALOG = ''' + @databaseName + ''' AND QUOTENAME(COLUMN_NAME) > ''' + @ColumnName + '''' PRINT @SQL EXEC master..sp_executesql @SQL, N'@ColumnResult nvarchar(256) out', @ColumnResult out SET @ColumnName = @ColumnResult PRINT @ColumnName IF @ColumnName IS NOT NULL BEGIN INSERT INTO @Results EXEC ( 'USE ' + @databaseName + ' SELECT ''' + @TableName + ''',''' + @ColumnName + ''',''' + @TableName + '.' + @ColumnName + ''', LEFT(' + @ColumnName + ', 3630) FROM ' + @TableName + ' (NOLOCK) ' + ' WHERE ' + @ColumnName + ' LIKE ' + @SearchStr2 ) END END END --Declaring another temporary table DECLARE @time_to_update TABLE(TableName nvarchar(370), RealColumnName nvarchar(370)) INSERT INTO @time_to_update SELECT TableName, RealColumnName FROM @Results GROUP BY TableName, RealColumnName DECLARE @MyCursor CURSOR; BEGIN DECLARE @t nvarchar(370) DECLARE @c nvarchar(370) --Looping over the search results SET @MyCursor = CURSOR FOR SELECT TableName, RealColumnName FROM @time_to_update GROUP BY TableName, RealColumnName --Getting my variables from the first item OPEN @MyCursor FETCH NEXT FROM @MyCursor INTO @t, @c WHILE @@FETCH_STATUS = 0 BEGIN -- Updating the old values with the new value DECLARE @sqlCommand varchar(1000) SET @sqlCommand = ' USE ' + @databaseName + ' UPDATE [' + @databaseName + '].' + @t + ' SET ' + @c + ' = REPLACE(' + @c + ', ''' + @SearchStr + ''', ''' + @ReplaceStr + ''') WHERE ' + @c + ' LIKE ''' + @SearchStr2 + '''' PRINT @sqlCommand BEGIN TRY EXEC (@sqlCommand) END TRY BEGIN CATCH PRINT ERROR_MESSAGE() END CATCH --Getting next row values FETCH NEXT FROM @MyCursor INTO @t, @c END; CLOSE @MyCursor ; DEALLOCATE @MyCursor; END; DELETE FROM @time_to_update DELETE FROM @Results FETCH NEXT FROM db_cursor INTO @databaseName END CLOSE db_cursor DEALLOCATE db_cursor
注意：这并不理想，也不是优化
如果您正在使用SQL Server 2005或更高版本，还可以在http://www.sqlsharp.com/上find一个CLR库，它提供了string和RegEx函数的;.NET实现，这取决于您的数据量和数据types更容易使用，在某些情况下，.NETstring操作函数可能比T-SQL更有效。
