blocks|key|828145|text|查看Microsoft+KB+OLE+DB+conversion+errors+may+occur|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|828146|如果这对您不起作用，那么您的现场笔记是大文本还是小于32767个字符?如果它很小，请尝试将其转换为32767+i+got+from+here+-+limitations+in+Firebird|828147|SELECT+CAST(NOTES+AS+VARCHAR(32767)),+other+fields+FROM+TABLE_NAME|code-block|syntax|javascript|828148|首先尝试使用最小的音符和较小的varchar类型转换-看看它是否有效-问题根本就是blob|828149|entityMap|0|LINK|mutability|MUTABLE|url|http://support.microsoft.com/kb/813524|1|http://www.firebirdsql.org/en/firebird-technical-specifications/^0|F|Y|0|0|1D|1B|1|0|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@$A|X|B|Y|1|Z]]|C|$]]|$1|D|3|E|5|6|7|10|8|@]|9|@$A|11|B|12|1|13]]|C|$]]|$1|F|3|G|5|H|7|14|8|@]|9|@]|C|$I|J]]|$1|K|3|L|5|6|7|15|8|@]|9|@]|C|$]]|$1|M|3|-4|5|6|7|16|8|@]|9|@]|C|$]]]|N|$O|$5|P|Q|R|C|$S|T]]|U|$5|P|Q|R|C|$S|V]]]]

look at Microsoft KB
<a href="http://support.microsoft.com/kb/813524" rel="nofollow">OLE DB conversion errors may occur</a>

if this not work for you
than is your field NOTES big text or reletive small &lt; 32767 chars?
<a href="http://www.firebirdsql.org/en/firebird-technical-specifications/" rel="nofollow">32767 i got from here - limitations in Firebird</a>
If it is small - try to cast it to varchar 

<pre><code>SELECT CAST(NOTES AS VARCHAR(32767)), other fields FROM TABLE_NAME
</code></pre>

First try with smallest notes and smaller varchar cast - and look if it work
If yes than maybe - problem is with blob at all

blocks|key|828151|text|我相信Firebird+blob在MS+SQL中是image数据类型，所以先转换为varbinary，再转换为varchar应该会有所帮助。你试过这个吗？|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|828152|select+cast(cast(NOTES+as+varbinary(max))+as+varchar(max))+from+openquery(Workbench,'select+*+from+table_name')|code-block|syntax|javascript|828153|希望这能有所帮助。|828154|entityMap^0|C|4|P|5|15|9|1J|7|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@$9|P|A|Q|B|C]|$9|R|A|S|B|C]|$9|T|A|U|B|C]|$9|V|A|W|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|X|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|Y|8|@]|D|@]|E|$]]|$1|M|3|-4|5|6|7|Z|8|@]|D|@]|E|$]]]|N|$]]

I believe Firebird <code>blob</code> is <code>image</code> data type in MS SQL, so casting to <code>varbinary</code> and then to <code>varchar</code> should help. Have you tried this?

<pre><code>select cast(cast(NOTES as varbinary(max)) as varchar(max)) from openquery(Workbench,'select * from table_name')
</code></pre>

Hope that helps.

blocks|key|825930|text|回答晚了，但也许它能帮助一些人...|type|unstyled|depth|inlineStyleRanges|entityRanges|data|825931|您可以通过以下语句将blob转换为varchar：|825932|SELECT+CAST(SUBSTRING(BlobColumn+FROM+1+FOR+32000)+AS+VARCHAR(32000))+AS+NewBlobColumn
FROM+TABLE_NAME|code-block|syntax|javascript|825933|然后，您可以在OPENQUERY-语句中使用它|825934|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|N|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|O|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|P|8|@]|9|@]|A|$]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

Late answer, but maybe it can help someone...

You can cast the blob to a varchar by this statement:

<pre><code>SELECT CAST(SUBSTRING(BlobColumn FROM 1 FOR 32000) AS VARCHAR(32000)) AS NewBlobColumn
FROM TABLE_NAME
</code></pre>

Then you can use this in the OPENQUERY-Statement

I am using <code>SQL Server</code> and have got a <code>Firebird</code> database as a linked server in my SQL Server.

I am trying to do an <code>OPENQUERY</code> to import data from the <code>Firebird</code> db;

<pre><code>SELECT * FROM OPENQUERY(Workbench, 'SELECT * FROM table_name')
</code></pre>

and am getting the following error.

<pre><code>OLE DB provider "MSDASQL" for linked server "Workbench" returned message "Requested conversion is not supported.".
Msg 7341, Level 16, State 2, Line 4
Cannot get the current row value of column "[MSDASQL].NOTES" from OLE DB provider "MSDASQL" for linked server "Workbench". 
</code></pre>

The data type <code>NOTES</code> field in the <code>Firebird</code> db is <code>blob</code>. If I omit the field <code>NOTES</code> the query executes and the results are imported correct.

But I need the information in the <code>NOTES</code> field and am looking for a way to <code>type cast</code> the blob field to <code>nvarchar</code>. I believe that this should be done within the <code>Openquery</code> (i.e. in the Firebird side of the query).

Could somebody suggest a pure <code>SQL</code> solution to convert <code>blob</code> to <code>nvarchar</code> in <code>Firebird</code> Please?

Convert text blob to nvarchar from Firebird to SQL Server

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我正在使用SQL Server，并且在我的SQL Server中有一个Firebird数据库作为链接服务器。我正在尝试执行一个从Firebird数据库导入数据的OPENQUERY；SELECT * FROM OPENQUERY(Workbench, 'SELECT * FROM table_name')我得到了下面的错...

问从Firebird到SQL Server将文本blob转换为nvarchar
EN

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问从Firebird到SQL Server将文本blob转换为nvarcharEN