The Art of C++ / PostgreSQL is a C++11 client library for PostgreSQL.

Preface
Example
Requirements
Installation
License

The Art of C++ / PostgreSQL is a light-weight C++11 client library for accessing a PostgreSQL database, providing a modern API around PostgreSQL's libpq. Besides a C++11 compatible compiler and libpq, it has no further dependencies.

The below is a small "getting started" example. The library has a lot more to offer and best practice is often different from the initial example's style.

#include <tao/postgres.hpp>

#include <cassert>
#include <iostream>

int main()
{
  // open a connection
  const auto conn = tao::postgres::connection::create( "dbname=template1" );

  // execute statements directly
  conn->execute( "DROP TABLE IF EXISTS tao_example" );
  conn->execute( "CREATE TABLE tao_example ( a INTEGER PRIMARY KEY, b INTEGER, c TEXT NOT NULL )" );

  // preparing a statement is optional, but often recommended
  conn->prepare( "insert", "INSERT INTO tao_example VALUES ( $1, $2, $3 )" );

  // use a transaction if needed
  {
    const auto tr = conn->transaction();

    // execute statement with parameters directly
    tr->execute( "INSERT INTO tao_example VALUES ( $1, $2, $3 )", 1, 42, "foo" );

    // execute prepared statement with parameters
    tr->execute( "insert", 2, tao::postgres::null, "Hello, world!" );

    tr->commit();
  }

  // insert/update/delete statements return a result which can be queried for the rows affected
  {
    const auto res = conn->execute( "insert", 3, 3, "drei" );
    assert( res.rows_affected() == 1 );
  }

  // queries have a result as well, it contains the returned data
  const auto res = conn->execute( "SELECT * FROM tao_example" );
  assert( res.size() == 3 );

  // iterate over a result
  for( const auto& row : res ) {
    // access fields by index or (less efficiently) by name
    std::cout << row[ 0 ].as< int >() << ": " << row[ "c" ].as< std::string >() << std::endl;
  }

  // or convert a result into a container
  const auto v = res.vector< std::tuple< int, tao::optional< int >, std::string > >();
}

The Art of C++ is certified Open Source software. It may be used for any purpose, including commercial purposes, at absolutely no cost. It is distributed under the terms of the MIT license reproduced here.

Copyright (c) 2016 Daniel Frey

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

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