遍歷列的SQL循環並執行REPLACE語句

Question

我試圖在SQL Server中的表中替換CRLF字符。一列的聲明的工作原理是這樣的：

select REPLACE(REPLACE(col_name,char(13),''), char(10), '') from table_name 

現在我想對我的表中的每一列重複一遍。我有以下腳本，不工作：

Declare @sql varchar(max) = '' 

select @sql = @sql + 'select [' + c.name + '] REPLACE(REPLACE(' + c.name + ', char(13),''), char(10), '') from [' + t.name + ']; ' 
from sys.columns c 
inner join sys.tables t on c.object_id = t.object_id 
where t.name = table_name 

EXEC (@sql) 

不幸的是，這並不工作，我得到了以下錯誤：

Msg 102, Level 15, State 1, Line 24 
Incorrect syntax near 'REPLACE'. 
Msg 102, Level 15, State 1, Line 24 
Incorrect syntax near 'REPLACE'. 
Msg 102, Level 15, State 1, Line 24 
Incorrect syntax near 'REPLACE'. 
Msg 102, Level 15, State 1 

Answer 1

兩件事情; 正如其他答案 所指出的那樣，在初始[c.name]之後需要有一個逗號。另外，要在字符串中獲得單引號，則需要兩個單引號。因此，要將兩個單引號放在一起，您需要四個單引號。

select @sql = @sql + 'select [' + c.name + '], REPLACE(REPLACE(' + c.name + ', char(13),''''), char(10), '''') from [' + t.name + ']; ' 
    from sys.columns c 
    inner join sys.tables t on c.object_id = t.object_id 
    where t.name = 'table_name' 

    exec (@sql) 

注：print(@sql)對調試這類問題有很大的幫助！

Answer 2

你可以試試這個方法，變量未設置替換爲值，引號不是雙引號...

Declare @sql varchar(max) = '' 

select @sql = @sql + 'select [' + c.name + '] = REPLACE(REPLACE(' + c.name + ', char(13),''''), char(10), '''') from [' + t.name + ']; ' 
from sys.columns c 
inner join sys.tables t on c.object_id = t.object_id 
where t.name = 'commasep' 

select @sql 

Answer 3

添加引號，刪除第一c.name或添加逗號，而不是添加[]使用QUOTENAME ：

Declare @sql varchar(max) = '' 

select @sql = @sql + 'select ' + QUOTENAME(c.name) + ', REPLACE(REPLACE(' + QUOTENAME(c.[name]) + ', char(13),''''), char(10), '''') from ' + QUOTENAME(t.[name]) + '; ' 
from sys.columns c 
inner join sys.tables t 
    on c.object_id = t.object_id 
where t.[name] = 'table_name' 

EXEC (@sql) 

編輯

如果您需要更新變化@sql部分：

select @sql = @sql + 'UPDATE ' + QUOTENAME(t.[name]) + ' SET ' + QUOTENAME(c.name) + ' = REPLACE(REPLACE(' + QUOTENAME(c.[name]) + ', char(13),''''), char(10), '''') ; '