sql-server - 替换所有数据库字段中的字符

Question

我们收到了一个 MSSQL 数据库，其中包含许多需要清理的表和字段。我们需要做的一件事是从任何文本字段中删除所有引号（chr(34) 和 chr(39)）。

寻找一种自动而不是手动执行此操作的方法。

Answer 1

一种基于非集合的方法：
下面的 sproc 基本上可以满足您的需求。
它使用嵌套的 WHILE 循环

• 父 WHILE 循环获取所有用户定义的表
• 嵌套的 WHILE 循环遍历所有基于字符的列（您可以修改）。然后它使用动态 SQL 来更新新字符串。

对于许多桌子和大型桌子，这显然需要相当长的时间才能完成。我相信这可以更好地优化。
如果有人能找到基于集合的方法，那就太好了。

来源和礼貌：Vyaskn

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'
                AND QUOTENAME(TABLE_SCHEMA) + '.' + QUOTENAME(TABLE_NAME) > @TableName
                AND OBJECTPROPERTY(
                        OBJECT_ID(
                            QUOTENAME(TABLE_SCHEMA) + '.' + QUOTENAME(TABLE_NAME)
                             ), 'IsMSShipped'
                               ) = 0
        )

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

            IF @ColumnName IS NOT NULL
            BEGIN
                SET @SQL=   'UPDATE ' + @TableName + 
                        ' SET ' + @ColumnName 
                        + ' =  REPLACE(' + @ColumnName + ', ' 
                        + QUOTENAME(@SearchStr, '''') + ', ' + QUOTENAME(@ReplaceStr, '''') + 
                        ') WHERE ' + @ColumnName + ' LIKE ' + @SearchStr2
                EXEC (@SQL)
                SET @RCTR = @RCTR + @@ROWCOUNT
            END
        END 
    END

    SELECT 'Replaced ' + CAST(@RCTR AS varchar) + ' occurence(s)' AS 'Outcome'
END

Answer 2

如果要替换 Unicode 字符，请使用以下代码：

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'
                AND QUOTENAME(TABLE_SCHEMA) + '.' + QUOTENAME(TABLE_NAME) > @TableName
                AND OBJECTPROPERTY(
                        OBJECT_ID(
                            QUOTENAME(TABLE_SCHEMA) + '.' + QUOTENAME(TABLE_NAME)
                             ), 'IsMSShipped'
                               ) = 0
        )

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

            IF @ColumnName IS NOT NULL
            BEGIN
                SET @SQL=   'UPDATE ' + @TableName + 
                        ' SET ' + @ColumnName 
                        + ' =  REPLACE(' + @ColumnName + ', N' 
                        + QUOTENAME(@SearchStr, '''') + ', N' + QUOTENAME(@ReplaceStr, '''') + 
                        ') WHERE ' + @ColumnName + ' LIKE N' + @SearchStr2
                EXEC (@SQL)
                SET @RCTR = @RCTR + @@ROWCOUNT
            END
        END 
    END

    SELECT 'Replaced ' + CAST(@RCTR AS varchar) + ' occurence(s)' AS 'Outcome'
END