<HTML>
<HEAD>
<meta name="GENERATOR" content="Microsoft Internet Assistant for PowerPoint 97">
<TITLE>Handling LONG/BLOB data</TITLE>
</HEAD>
<BODY >
<H1>Handling LONG/BLOB data</H1>
<P><UL>
<LI><H2>What makes LONG / BLOB data special?
</H2>
<UL>
<LI>Not practical to pre-allocate fixed size buffers for worst case
<LI>
</UL></UL><UL>
<LI><H2>Fetching LONGs - treat as normal fields after setting:
</H2>
<UL>
<LI>$dbh->{LongReadLen} - buffer size to allocate for expected data
<LI>$dbh->{LongTruncOk} - should truncating-to-fit be allowed
<LI>
</UL></UL><UL>
<LI><H2>Inserting LONGs
</H2>
<UL>
<LI>The limitations of string literals
<LI>The benefits of placeholders
<LI>
</UL></UL><UL>
<LI><H2>Chunking / Piecewise processing not yet supported
</H2>
<UL>
<LI>So you're limited to available memory
<LI>Some drivers support blob_read()and other private methods
</UL></UL><UL>
<H2>-</H2>
</UL></P>
<P></P>
<P>
<TABLE>
<TD HEIGHT=100 WIDTH=100> <A HREF="tsld078.htm">Previous slide</A> </TD>
<TD HEIGHT=100 WIDTH=100> <A HREF="tsld080.htm">Next slide</A> </TD>
<TD HEIGHT=100 WIDTH=150> <A HREF="tsld001.htm">Back to first slide</A> </TD>
<TD HEIGHT=100 WIDTH=150> <A HREF="sld079.htm">View graphic version</A> </TD>
</TABLE>
<BR>
</P>
</Body>
</HTML>