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Proof of concept
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‎GNUmakefile.in

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@@ -131,4 +131,12 @@ distcheck: dist
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rm -rf $(distdir) $(dummy)
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@echo "Distribution integrity checks out."
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LIBPQPARSEROBJS= $(shell cat src/backend/access/objfiles.txt src/backend/bootstrap/objfiles.txt src/backend/catalog/objfiles.txt src/backend/parser/objfiles.txt src/backend/commands/objfiles.txt src/backend/executor/objfiles.txt src/backend/foreign/objfiles.txt src/backend/lib/objfiles.txt src/backend/libpq/objfiles.txt src/backend/nodes/objfiles.txt src/backend/optimizer/objfiles.txt src/backend/port/objfiles.txt src/backend/postmaster/objfiles.txt src/backend/regex/objfiles.txt src/backend/replication/objfiles.txt src/backend/rewrite/objfiles.txt src/backend/storage/objfiles.txt src/backend/tcop/objfiles.txt src/backend/tsearch/objfiles.txt src/backend/utils/objfiles.txt src/timezone/objfiles.txt src/backend/parser/objfiles.txt)
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libpqparser:
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ar cr libpqparser.a $(LIBPQPARSEROBJS)
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ranlib libpqparser.a
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cp src/port/libpgport_srv.a $(DESTDIR)$(libdir)
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cp libpqparser.a $(DESTDIR)$(libdir)/
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.PHONY: dist distdir distcheck docs install-docs world check-world install-world installcheck-world

‎README.md

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PostgreSQL Wire Protocol Experiment
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===================================
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DRAFT
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-----
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Original PostgreSQL README file
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-------------------------------
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The original PostgreSQL README file is [here](postgres/blob/master/README).
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Overview
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--------
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This is an experiment to see what happens if SQL isn't used as a wire protocol for relational database access.
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The reasoning is as follows:
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* Most sophisticated relational database libraries (including ORMs) store queries internally as expression trees.
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* These expression trees are converted to SQL for transmission to a database.
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* The database then parses the SQL into an expression tree.
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* In theory, the expression tree can be passed directly from the client to the server, rather than going through
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the intermediate SQL conversion step.
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Status
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------
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As at the date of writing (12/16/2012) this is a minimally viable proof of concept:
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* It can execute simple SQL arithmetic expressions. (E.g. "select 1 + 2;")
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* It can select simple columns from tables (no namespacing, etc.) (E.g. "select first_name from users;")
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* It can name selected columns (E.g. "select 2 * 5 as result;")
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Solution Components
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-------------------
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There are two repositories associated with this experiment:
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* A modified version of PostgreSQL that can accept a serialized expression tree.
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* A modified version of ruby-pg, the ruby client-side interface for PostgreSQL.
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This component links to customized PostgreSQL libraries that parse SQL to an expression tree, before passing
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that expression tree to the PostgreSQL server.
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Building
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--------
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### Install Prefix
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To be sure you don't break your existing Postgresql installation, we'll install somewhere else:
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export INSTALL_PREFIX="${HOME}/test-postgresql"
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export DB_PREFIX="${HOME}/testdb"
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export DB_NAME="testdb"
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### Postgresql
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1. Download, unpack and cd
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2. Build and install
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export CFLAGS="-g -fPIC"
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autoconf
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./configure --prefix=${INSTALL_PREFIX} --enable-debug --with-libxml
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make && make install
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### ruby-pg
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1. Set path
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PATH="${INSTALL_PREFIX}/bin:$PATH"; export PATH
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2. Download, unpack and cd
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3. Build and install
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rake install_gem
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Testing
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--------
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### Setup test database
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1. Create database
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initdb -D ${DB_PREFIX}
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2. Run postgresql server
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postgres -D ${DB_PREFIX}
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3. Create test table
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psql ${DB_NAME}
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create table test (num integer, str varchar(50));
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insert into test values (14, 'Test');
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^D
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### Run client
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irb
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require 'pg'
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conn = PG.connect( host: "localhost", dbname: ENV["DB_PREFIX"])
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x = conn.exec "select * from test;"
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x.first
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Build Notes
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-----------------
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### Build Environment
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My development system runs FreeBSD 9.0. To build in this environment, you must upgrade GCC (I'm using 4.8).
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‎config/programs.m4

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@@ -235,3 +235,24 @@ AC_DEFUN([PGAC_CHECK_STRIP],
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AC_SUBST(STRIP_STATIC_LIB)
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AC_SUBST(STRIP_SHARED_LIB)
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])# PGAC_CHECK_STRIP
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# PGAC_PATH_ASN1C
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# ---------------
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# Look for asn1c, set the output variable ASN1C to its path if found.
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AC_DEFUN([PGAC_PATH_ASN1C],
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[# Let the user override the search
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if test -z "$ASN1C"; then
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AC_PATH_PROGS(ASN1C, asn1c)
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fi
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if test -z "$ASN1C"; then
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AC_MSG_WARN([
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*** Without asn1c you will not be able to build PostgreSQL from Git nor
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*** change any of the PDU definition files. (If you are using the
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*** official distribution of PostgreSQL then you do not need to worry
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*** about this, because the asn1c output is pre-generated.)])
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fi
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# We don't need AC_SUBST(ASN1C) because AC_PATH_PROG did it
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AC_SUBST(ASN1CFLAGS)
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])# PGAC_PATH_ASN1C

‎configure.in

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PGAC_PATH_BISON
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PGAC_PATH_FLEX
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PGAC_PATH_ASN1C
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PGAC_PATH_PERL
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if test "$with_perl" = yes; then

‎src/Makefile

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include Makefile.global
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SUBDIRS = \
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asn1 \
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common \
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port \
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timezone \

‎src/Makefile.global.in

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@@ -204,7 +204,7 @@ PTHREAD_LIBS = @PTHREAD_LIBS@
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# Compilers
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CPP = @CPP@
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CPPFLAGS = @CPPFLAGS@
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CPPFLAGS = @CPPFLAGS@ -I$(top_srcdir)/src/include/asn1
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ifdef PGXS
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override CPPFLAGS := -I$(includedir_server) -I$(includedir_internal) $(CPPFLAGS)
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# Kind-of compilers
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ASN1C = @ASN1C@
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BISON = @BISON@
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BISONFLAGS = @BISONFLAGS@ $(YFLAGS)
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FLEX = @FLEX@

‎src/asn1/ASNBinaryExpression.c

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/*
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* Generated by asn1c-0.9.21 (http://lionet.info/asn1c)
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* From ASN.1 module "SQLQuery"
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* found in "SQLQuery.asn1"
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* `asn1c -fskeletons-copy -fnative-types`
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*/
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#include <asn_internal.h>
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#include "ASNBinaryExpression.h"
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static asn_TYPE_member_t asn_MBR_ASNBinaryExpression_1[] = {
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{ ATF_POINTER, 0, offsetof(struct ASNBinaryExpression, lhs),
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-1 /* Ambiguous tag (CHOICE?) */,
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0,
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&asn_DEF_ASNExpression,
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0, /* Defer constraints checking to the member type */
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0, /* No PER visible constraints */
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0,
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"lhs"
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},
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{ ATF_NOFLAGS, 0, offsetof(struct ASNBinaryExpression, operator),
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(ASN_TAG_CLASS_UNIVERSAL | (10 << 2)),
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0,
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&asn_DEF_ASNBinaryOperator,
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0, /* Defer constraints checking to the member type */
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0, /* No PER visible constraints */
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0,
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"operator"
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},
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{ ATF_POINTER, 0, offsetof(struct ASNBinaryExpression, rhs),
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-1 /* Ambiguous tag (CHOICE?) */,
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0,
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&asn_DEF_ASNExpression,
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0, /* Defer constraints checking to the member type */
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0, /* No PER visible constraints */
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0,
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"rhs"
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},
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};
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static ber_tlv_tag_t asn_DEF_ASNBinaryExpression_tags_1[] = {
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(ASN_TAG_CLASS_UNIVERSAL | (16 << 2))
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};
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static asn_TYPE_tag2member_t asn_MAP_ASNBinaryExpression_tag2el_1[] = {
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{ (ASN_TAG_CLASS_UNIVERSAL | (10 << 2)), 1, 0, 0 }, /* operator at 54 */
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{ (ASN_TAG_CLASS_CONTEXT | (0 << 2)), 0, 0, 1 }, /* intConst at 46 */
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{ (ASN_TAG_CLASS_CONTEXT | (0 << 2)), 2, -1, 0 }, /* intConst at 46 */
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{ (ASN_TAG_CLASS_CONTEXT | (1 << 2)), 0, 0, 1 }, /* floatConst at 47 */
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{ (ASN_TAG_CLASS_CONTEXT | (1 << 2)), 2, -1, 0 }, /* floatConst at 47 */
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{ (ASN_TAG_CLASS_CONTEXT | (2 << 2)), 0, 0, 1 }, /* stringConst at 48 */
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{ (ASN_TAG_CLASS_CONTEXT | (2 << 2)), 2, -1, 0 }, /* stringConst at 48 */
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{ (ASN_TAG_CLASS_CONTEXT | (3 << 2)), 0, 0, 1 }, /* binaryExpr at 50 */
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{ (ASN_TAG_CLASS_CONTEXT | (3 << 2)), 2, -1, 0 } /* binaryExpr at 50 */
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};
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static asn_SEQUENCE_specifics_t asn_SPC_ASNBinaryExpression_specs_1 = {
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sizeof(struct ASNBinaryExpression),
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offsetof(struct ASNBinaryExpression, _asn_ctx),
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asn_MAP_ASNBinaryExpression_tag2el_1,
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9, /* Count of tags in the map */
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0, 0, 0, /* Optional elements (not needed) */
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-1, /* Start extensions */
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-1 /* Stop extensions */
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};
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asn_TYPE_descriptor_t asn_DEF_ASNBinaryExpression = {
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"ASNBinaryExpression",
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"ASNBinaryExpression",
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SEQUENCE_free,
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SEQUENCE_print,
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SEQUENCE_constraint,
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SEQUENCE_decode_ber,
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SEQUENCE_encode_der,
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SEQUENCE_decode_xer,
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SEQUENCE_encode_xer,
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SEQUENCE_decode_uper,
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SEQUENCE_encode_uper,
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0, /* Use generic outmost tag fetcher */
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asn_DEF_ASNBinaryExpression_tags_1,
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sizeof(asn_DEF_ASNBinaryExpression_tags_1)
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/sizeof(asn_DEF_ASNBinaryExpression_tags_1[0]), /* 1 */
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asn_DEF_ASNBinaryExpression_tags_1, /* Same as above */
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sizeof(asn_DEF_ASNBinaryExpression_tags_1)
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/sizeof(asn_DEF_ASNBinaryExpression_tags_1[0]), /* 1 */
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0, /* No PER visible constraints */
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asn_MBR_ASNBinaryExpression_1,
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3, /* Elements count */
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&asn_SPC_ASNBinaryExpression_specs_1 /* Additional specs */
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};
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‎src/asn1/ASNBinaryExpression.h

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/*
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* Generated by asn1c-0.9.21 (http://lionet.info/asn1c)
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* From ASN.1 module "SQLQuery"
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* found in "SQLQuery.asn1"
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* `asn1c -fskeletons-copy -fnative-types`
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*/
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#ifndef _ASNBinaryExpression_H_
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#define _ASNBinaryExpression_H_
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#include <asn_application.h>
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/* Including external dependencies */
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#include "ASNBinaryOperator.h"
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#include <constr_SEQUENCE.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* Forward declarations */
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struct ASNExpression;
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/* ASNBinaryExpression */
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typedef struct ASNBinaryExpression {
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struct ASNExpression *lhs;
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ASNBinaryOperator_t operator;
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struct ASNExpression *rhs;
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/* Context for parsing across buffer boundaries */
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asn_struct_ctx_t _asn_ctx;
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} ASNBinaryExpression_t;
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/* Implementation */
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extern asn_TYPE_descriptor_t asn_DEF_ASNBinaryExpression;
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#ifdef __cplusplus
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}
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#endif
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/* Referred external types */
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#include "ASNExpression.h"
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#endif /* _ASNBinaryExpression_H_ */

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