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））。

寻找自动而非手动执行此操作的方法。

Answer 1

基于非集合的方法：
以下的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char的列（您可以使用可以修改）。然后它使用动态SQL来更新新字符串。

对于许多表和大型表，这显然需要很长时间才能完成。我相信这可以更好地进行优化如果任何人都可以找到基于集合的方法，那将是一件事。

来源＆amp;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

替换所有数据库字段中的字符

2 个答案: