It's really strange, is it usual? Or it is a driver problem. May be I can change this behavior. It's the normal behaviour, but you're really not expected to use that representation directly. Both of them is not pure binary, because they are hex strings [bytea in pgsql terms]. It's a large overhead to convert hex string to byte array evertime when you works with millions of records. Show 1 more comments.
Active Oldest Votes. Improve this answer. Craig Ringer Craig Ringer 4 4 silver badges 13 13 bronze badges. Edited to add more detail. I'm fully understand situation now. I deleted my unuseful comments. Actually, I'd say if you do a protocol dump with WireShark you'll find you're still exchanging the PostGIS data between client and server as text.
See simplified and clarified answer above. The short version is that if you truly feel you must exchange raw binary you must use the binary mode protocol, but it doesn't look like nPgSQL actually supports it. You are right. It's a text protocol i Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown. The Overflow Blog.
I followed my dreams and got demoted to software developer. Podcast How to think in React. Featured on Meta. Opt-in alpha test for a new Stacks editor. Visual design changes to the review queues. Should we promote FOSS community events? You can do it either way. Hard-wiring the type OID will be a bit faster than making the server parse a ton of repetitive cast constructs, but on the other hand it means you have a magic number in your program.
It's unlikely the OID assigned to bytea would ever change, but the technique doesn't scale well to user-defined types. Take your choice. I tried both ways: they're ok. For inserting, you stack an array of composites locally and send it to the database with a single query and the receiving side can unwrap it and do the insert in a function. Advancements in json handling have largely displaced this kind of usage in many situations but if you have extreme performance requirements it's still worth a look.
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David Hinkle. I have been trying to figure this out all morning, and I've gotten no where so far. I am trying to insert binary data into a bytea column with PQExecParams. If anybody could help me find the right way to do this I'd really apreciate it Re: libpq, PQExecParams and the inserting of binary data.
You don't need to also you shouldn't escape any data while using parameters. Because, you'll miss one big advantage of parameter usage. There can be semicolons in it, but not more than one nonempty command. This is a limitation of the underlying protocol, but has some usefulness as an extra defense against SQL-injection attacks. Yea, I know, but that doesn't help me. I need to know how to insert binary data.
I can't do it as text without escaping because it's not null terminated and may contain nulls. I can't do it as binary because I don't have any documentation on how to use it that way. What I'm asking for is an expample or a document showing me how to do it. I already know my way doesn't work. If you could show me the proper way to do it that would be great.
Tom Lane In reply to this post by David Hinkle. No, because PQescapeBytea is designed to do the escaping that would be needed to put the bytea value into a string literal in a SQL command. There's an extra level of backslashing involved to do that because backslashes are special to both the string-literal syntax and the text input syntax for bytea.
But this is really the hard way to do it considering that you are using PQexecParams. Daniel Verite. In reply to this post by Tom Lane I read all the examples and documentation thouroughly. I would not bother you guys otherwise. That example doesn't show you how to use any binary parameters All the parameters are text, it only shows you how get binary results.
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