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From "Jeff Butler" <jeffgbut...@gmail.com>
Subject Re: blob vs clob in mysql
Date Mon, 03 Nov 2008 17:17:59 GMT
With the combination of byte[] and CLOB, iBATIS should use the
ByteArrayTypeHandler.  This type hander executes the JDBC call
ResultSet.getBytes().

With the combination of byte[] and BLOB or LONGVARBINARY, iBATIS
should use BlobTypeHandlerCallback.  This type handler basically
executes the JDBC call ResultSet.getBlob().getBytes().

It might be enlightening to know where the exception is being thrown.
That might help track down the error.

Jeff Butler


On Fri, Oct 31, 2008 at 10:20 AM, Jason Sheedy <mobilejason@gmail.com> wrote:
> Hi Jeff,
> the result type is indeed byte[]. The strange thing is that it works fine
> when using CLOB as the jdbcType, but not BLOG or LONGVARBINARY. I used
> abator to create the initial mapping, but I'm actually a bit unclear about
> the purpose of LONGVARBINARY. Any idea what the difference is between that
> and BLOG? I know CLOB is supposed to be used for character data...
>
> Cheers,
>
> Jason
>
> 2008/11/1 Jeff Butler <jeffgbutler@gmail.com>
>>
>> What is the Java type of  the file_data propoerty in your result
>> class?  Should be byte[] for a BLOB.
>>
>> Jeff Butler
>>
>> On Thu, Oct 30, 2008 at 7:01 PM, Jason Sheedy <mobilejason@gmail.com>
>> wrote:
>> > Hi,
>> > I'm new to this list, so please excuse be kind. I'm trying to get my
>> > head
>> > around using blobs with ibatis/mysql and have run into an issue when
>> > trying
>> > to read the blobs back into my result map.
>> >
>> > For some unknown reason using BLOB or LONGVARBINARY for the jdbcType on
>> > my
>> > result map throws a strange exception. The binary data is written
>> > correctly,  but when i try and read it in i get the following exception.
>> >
>> > com.ibatis.sqlmap.client.SqlMapException: Error getting nested result
>> > map
>> > values
>> >     for 'attachments'.  Cause: java.sql.SQLException: Not a valid escape
>> > sequence:
>> >
>> > <resultMap id="compositeAttachment" class="........EQAttach" >
>> >     <result column="eq_attach_id" property="eqAttachId"
>> > jdbcType="INTEGER"
>> > />
>> >     <result column="eq_id" property="eqId" jdbcType="INTEGER" />
>> >     <result column="file_name" property="fileName" jdbcType="VARCHAR" />
>> >     <result column="file_size" property="size" jdbcType="SMALLINT" />
>> >     <result column="file_data" property="fileContent" jdbcType="BLOB" />
>> >   </resultMap>
>> >
>> > The really strange thing is that everything works ok if I user CLOB as
>> > the
>> > jdbcType. My data type on the mysql field is blob.
>> >
>> > Any tips would be appreciated.
>> >
>> >
>> > --
>> > Jason Sheedy
>> > www.bytespring.com
>> > www.jmpj.net
>> >
>> > ---------------------------------------------------------------------------------------------
>> >
>> > ---------------------------------------------------------------------------------------------
>> >
>
>
>
> --
> Jason Sheedy
> www.bytespring.com
> www.jmpj.net
> ---------------------------------------------------------------------------------------------
> ---------------------------------------------------------------------------------------------
>

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