# OCILIB - C and C++ Drivers for Oracle

1. About

OCILIB is an open source and cross platform Oracle Driver that delivers efficient access to Oracle databases.

The OCILIB library :

• offers a rich, full featured and easy to use API
• runs on all Oracle platforms
• is written in pure ISO C99 code with native ISO C Unicode support
• provides also a C++ API written in standard C++03 with support for some C++11 features
• Enables high productivity
• encapsulates OCI (Oracle Call Interface)
• is the most complete available OCI wrapper

OCILIB is developed by Vincent Rogier. Get the latest package, install and enjoy it!

2. License

The source code is free source code licensed under Apache License, Version 2.0 - see LICENSE file

3. Features

• ISO C API
• ISO C ++ API
• Full ANSI and Unicode support on all platforms (ISO C wide strings or UTF8 strings)
• Full 32/64 bits compatibility
• Compatible with all Oracle version >= 8.0
• Automatic adaptation to the runtime Oracle client version
• Runtime loading of Oracle libraries
• Built-in error handling (global and thread context)
• Full support for SQL API and Object API
• Full support for ALL Oracle SQL and PL/SQL datatypes (scalars, objects, refs, collections, ..)
• Full support for PL/SQL (blocks, cursors, Index by Tables and Nested tables)
• Support for non scalar datatype with trough library objects
• Oracle Pooling (connections and sessions pools)
• Oracle XA connectivity (X/Open Distributed Transaction Processing XA interface)
• Oracle AQ (Advanced Queues)
• Oracle TAF (Transparent Application Failover) and HA (High availability) support
• Binding array Interface
• Returning DML feature
• Scrollable statements
• Statement cache
• Direct Path loading
• Remote Instances Startup/Shutdown
• Oracle Database Change notification / Continuous Query Notification
• Oracle warnings support
• Global and local transactions
• Describe database schema objects
• Hash tables API
• Portable Threads and mutexes API

5. Installation

Windows platforms

• unzip the archive
• copy ocilib\include\ocilib.h to any place located in your include’s path
• copy ocilib\lib32|64\ocilib[x].lib to any place located in your libraries path
• copy ocilib\lib32|64\ocilib[x].dll to any place located in your windows path

GNU (Unix / Linux) platforms

• untar the archive
• $ cd ocilib-x.y.z
• $ ./configure
• $ make
• $ make install (you might need to su to make install)

Make sure Oracle and OCILIB libraries paths are defined in your shared library environment variable You need to provide extra configure parameters when using Instant Clients – see Installation section)

6. Examples

Example of a minimal OCILIB C application

#include "ocilib.h"

int main(int argc, char *argv[])
{
    OCI_Connection* cn;
    OCI_Statement* st;
    OCI_Resultset* rs;

    OCI_Initialize(NULL, NULL, OCI_ENV_DEFAULT);

    cn = OCI_ConnectionCreate("db", "usr", "pwd", OCI_SESSION_DEFAULT);
    st = OCI_StatementCreate(cn);

    OCI_ExecuteStmt(st, "select intcol, strcol from table");

    rs = OCI_GetResultset(st);

    while (OCI_FetchNext(rs))
    {
        printf("%i - %s\n", OCI_GetInt(rs, 1), OCI_GetString(rs,2));
    }

    OCI_Cleanup();

    return EXIT_SUCCESS;
}

Example of a minimal OCILIB C++ application

#include "ocilib.hpp"

using namespace ocilib;

int main(void)
{
    try
    {
        Environment::Initialize();

        Connection con("db", "usr", "pwd");

        Statement st(con);
        st.Execute("select intcol, strcol from table");

        Resultset rs = st.GetResultset();
        while (rs.Next())
        {
            std::cout << rs.Get<int>(1) << " - " <<  rs.Get<ostring>(2) << std::endl;
        }
    }
    catch(std::exception &ex)
    {
         std::cout << ex.what() << std::endl;
    }

    Environment::Cleanup();

    return EXIT_SUCCESS;
}