Trim 整个数据库内的空间

Question

如何在特定数据库的所有 table 列值中 trim 空格？

数据库中所有 table 的行列值内必须有 LTrim 和 RTrim 空格。我怎样才能做到这一点？

Answer 1

你可以这样写：

DECLARE @SQL AS VarChar(MAX)
SET @SQL = ''

SELECT @SQL = @SQL + 'UPDATE ' +  IT.TABLE_SCHEMA + '.[' 
              + IT.TABLE_NAME + ']' 
              + 'SET '+IC.COLUMN_NAME
              + ' = LTRIM(RTRIM(' + IC.COLUMN_NAME+')) ' + CHAR(13)
FROM INFORMATION_SCHEMA.TABLES IT
JOIN INFORMATION_SCHEMA.COLUMNS IC ON IT.TABLE_NAME = IC.TABLE_NAME
AND IT.TABLE_SCHEMA = IC.TABLE_SCHEMA

EXEC (@SQL)

Answer 2

请尝试使用以下脚本通过指定 table 名称

trim space

DECLARE @SQL VARCHAR(MAX)
DECLARE @TableName NVARCHAR(100)
SET @TableName = 'TableName'

SELECT @SQL = COALESCE(@SQL + ',[', '[') + 
COLUMN_NAME + ']=RTRIM([' + COLUMN_NAME + '])'
FROM INFORMATION_SCHEMA.COLUMNS
WHERE TABLE_NAME = @TableName
--AND DATA_TYPE = 'varchar' /*If any condition in my case its varchar*/

SET @SQL = 'UPDATE [' + @TableName + '] SET ' + @SQL
PRINT @SQL

Answer 3

天哪..做这件事我都快出汗了:D

这将遍历数据库中的所有表，并生成并执行查询 trim 其中的所有列

DECLARE @tablename as nvarchar(100)=''
Declare @sql varchar(max) = ''

DECLARE tempcursor CURSOR FOR 
SELECT TABLE_NAME
FROM information_schema.tables
where TABLE_TYPE = 'BASE TABLE'

OPEN tempcursor

FETCH NEXT FROM tempcursor 
INTO @tablename


WHILE @@FETCH_STATUS = 0
BEGIN

    if exists (select c.name from sys.columns c inner join sys.tables t on c.object_id = t.object_id
                where t.name = @tablename and collation_name is not null)
    BEGIN
        set @sql = @sql + 'update '+ @tablename + ' SET '

        select @sql = @sql + c.name + '= LTRIM(RTRIM(' + c.name + ')) ,'
        from sys.columns c
        inner join sys.tables t on c.object_id = t.object_id
        where t.name = @tablename
        and collation_name is not null
        and is_ansi_padded = 1
        and is_computed = 0

        SET @sql = LEFT(@sql, LEN(@sql) - 1)
    END

    FETCH NEXT FROM tempcursor 
    INTO @tablename
END 
CLOSE tempcursor;
DEALLOCATE tempcursor;

print @sql
EXEC (@sql)

记住 SQL 查询字符串变量（即 @sql）的 8000 个字符的限制

Answer 4

试试下面一个

     DECLARE @SQL AS VarChar(MAX)
        SET @SQL = ''

         SELECT @SQL = @SQL + 'UPDATE T SET T.'+IC.COLUMN_NAME + 
                          ' = LTRIM(RTRIM(' + IC.COLUMN_NAME+')) 
                          FROM '+ IT.TABLE_SCHEMA + '.[' + IT.TABLE_NAME +
                          '] AS T ;' + CHAR(13)
            FROM INFORMATION_SCHEMA.TABLES IT
            JOIN INFORMATION_SCHEMA.COLUMNS IC ON IT.TABLE_NAME = IC.TABLE_NAME
            AND IT.TABLE_SCHEMA = IC.TABLE_SCHEMA AND IT.TABLE_TYPE = 'BASE TABLE'
and IC.DATA_TYPE in( 'varchar','char','nvarchar','nchar')

        Exec (@SQL)

Answer 5

这解决了我的问题：

    DECLARE @SQL AS VarChar(MAX)
    SET @SQL = ''

    SELECT @SQL += 'UPDATE ' +  IT.TABLE_SCHEMA + '.' 
                  + QUOTENAME(IT.TABLE_NAME) + 
                  + 'SET '+IC.COLUMN_NAME
                  + ' = LTRIM(RTRIM(' + IC.COLUMN_NAME+')) ' + CHAR(13)
    FROM INFORMATION_SCHEMA.TABLES IT
    JOIN INFORMATION_SCHEMA.COLUMNS IC ON IT.TABLE_NAME = IC.TABLE_NAME
    AND IT.TABLE_SCHEMA = IC.TABLE_SCHEMA AND IC.DATA_TYPE in ('nvarchar','char','varchar','nchar')

    EXEC (@SQL)

参考： Deepshikha的回答..谢谢Deepshikha

Trim 整个数据库内的空间

Trim Spaces inside whole Database

sql

database

trim

sql-server-2012