ODBCPP - Multi-Database ODBC Driver Framework

A modern C++20 framework for building database-specific ODBC drivers with pluggable protocol support.

Features

Complete ODBC API: 23 ODBC functions implemented with full descriptor support
4 ODBC Descriptors: IRD, APD, ARD, IPD fully implemented
Prepared Statements: Full SQLPrepare/SQLBindParameter/SQLExecute workflow
Column Binding: SQLBindCol with automatic data population during fetch
Single Database Per Build: Each build targets one specific database for optimal size and performance
Pluggable Architecture: Easy to add new database protocols
Modern C++20: Clean, type-safe interfaces
Secure Transport: Built-in TLS/SSL support via OpenSSL
Cross-Platform: macOS, Linux, Windows support
Comprehensive Testing: 17 unit and integration tests with 100% pass rate

Implementation Status

ODBC API Coverage

Component	Status	Functions
Core APIs	✅ Complete	SQLAllocHandle, SQLFreeHandle, SQLConnect, SQLDisconnect
Statement Execution	✅ Complete	SQLExecDirect, SQLFetch, SQLGetData
Prepared Statements	✅ Complete	SQLPrepare, SQLExecute, SQLBindParameter
Column Binding	✅ Complete	SQLBindCol with auto-population
Metadata	✅ Complete	SQLNumResultCols, SQLDescribeCol, SQLColAttribute
Parameter Metadata	✅ Complete	SQLDescribeParam
Error Handling	✅ Complete	SQLGetDiagRec
Driver Info	✅ Complete	SQLGetInfo, SQLSetEnvAttr

ODBC Descriptors

Descriptor	Status	Purpose
IRD	✅ Complete	Implementation Row Descriptor - result column metadata
APD	✅ Complete	Application Parameter Descriptor - parameter binding
ARD	✅ Complete	Application Row Descriptor - column binding
IPD	✅ Complete	Implementation Parameter Descriptor - parameter metadata

Supported Databases

Database	Status	Protocol
Redshift	✅ Production Ready	PostgreSQL Wire Protocol
PostgreSQL	✅ Production Ready	PostgreSQL Wire Protocol
MySQL	🚧 Planned	MySQL Protocol
SQL Server	🚧 Planned	TDS Protocol

Quick Start

Prerequisites

CMake 3.20+
C++20 compiler (GCC 10+, Clang 12+, MSVC 2019+)
OpenSSL 3.0+
unixODBC (for system integration)

Build ODBC Driver

# Build database-specific driver (recommended)
./build-database.sh redshift

# Or build manually
cmake -DTARGET_DATABASE=REDSHIFT -B build-redshift
cmake --build build-redshift

ODBC Configuration Setup

# Setup test environment with local ODBC configuration
source ./setup-test-env.sh

# Verify configuration
echo $ODBCINI    # Should point to ./odbc.ini
echo $ODBCSYSINI # Should point to current directory

Build for Specific Database

# Redshift ODBC driver
./build-database.sh redshift

# PostgreSQL ODBC driver  
./build-database.sh postgresql

# Minimal build (no examples/tests)
./build-database.sh minimal

# Debug build
./build-database.sh redshift --debug

Usage

Standard ODBC (Recommended)

#include <sql.h>
#include <sqlext.h>

int main() {
    SQLHENV henv;
    SQLHDBC hdbc;
    SQLHSTMT hstmt;
    
    // Allocate handles
    SQLAllocHandle(SQL_HANDLE_ENV, nullptr, &henv);
    SQLSetEnvAttr(henv, SQL_ATTR_ODBC_VERSION, (void*)SQL_OV_ODBC3, 0);
    SQLAllocHandle(SQL_HANDLE_DBC, henv, &hdbc);
    
    // Connect using DSN or connection string
    SQLConnect(hdbc, 
        (SQLCHAR*)"DSN=RedshiftProd", SQL_NTS,
        (SQLCHAR*)"username", SQL_NTS,
        (SQLCHAR*)"password", SQL_NTS);
    
    // Execute query
    SQLAllocHandle(SQL_HANDLE_STMT, hdbc, &hstmt);
    SQLExecDirect(hstmt, (SQLCHAR*)"SELECT version()", SQL_NTS);
    
    // Fetch results
    char version[512];
    while (SQLFetch(hstmt) == SQL_SUCCESS) {
        SQLGetData(hstmt, 1, SQL_C_CHAR, version, sizeof(version), nullptr);
        printf("Version: %s\n", version);
    }
    
    // Cleanup
    SQLFreeHandle(SQL_HANDLE_STMT, hstmt);
    SQLDisconnect(hdbc);
    SQLFreeHandle(SQL_HANDLE_DBC, hdbc);
    SQLFreeHandle(SQL_HANDLE_ENV, henv);
    
    return 0;
}

Column Binding (Advanced)

#include <sql.h>
#include <sqlext.h>

int main() {
    SQLHENV henv;
    SQLHDBC hdbc;
    SQLHSTMT hstmt;
    
    // Setup handles
    SQLAllocHandle(SQL_HANDLE_ENV, nullptr, &henv);
    SQLSetEnvAttr(henv, SQL_ATTR_ODBC_VERSION, (void*)SQL_OV_ODBC3, 0);
    SQLAllocHandle(SQL_HANDLE_DBC, henv, &hdbc);
    SQLConnect(hdbc, (SQLCHAR*)"DSN=RedshiftProd", SQL_NTS, nullptr, 0, nullptr, 0);
    SQLAllocHandle(SQL_HANDLE_STMT, hdbc, &hstmt);
    
    // Execute query
    SQLExecDirect(hstmt, (SQLCHAR*)"SELECT name, age, salary FROM employees", SQL_NTS);
    
    // Bind columns to variables
    char name[256];
    SQLINTEGER age;
    SQLDOUBLE salary;
    SQLLEN name_len, age_len, salary_len;
    
    SQLBindCol(hstmt, 1, SQL_C_CHAR, name, sizeof(name), &name_len);
    SQLBindCol(hstmt, 2, SQL_C_SLONG, &age, 0, &age_len);
    SQLBindCol(hstmt, 3, SQL_C_DOUBLE, &salary, 0, &salary_len);
    
    // Fetch automatically populates bound variables
    while (SQLFetch(hstmt) == SQL_SUCCESS) {
        printf("Employee: %s, Age: %d, Salary: %.2f\n", name, age, salary);
    }
    
    // Cleanup
    SQLFreeHandle(SQL_HANDLE_STMT, hstmt);
    SQLDisconnect(hdbc);
    SQLFreeHandle(SQL_HANDLE_DBC, hdbc);
    SQLFreeHandle(SQL_HANDLE_ENV, henv);
    
    return 0;
}

Direct Library Usage

#include "core/database/database_factory.h"

using namespace rs::core::database;

int main() {
    // Create connection for compiled database
    auto conn = DatabaseFactory::create_connection();
    
    // Configure connection
    ConnectionSettings settings;
    settings.host = "your-redshift-cluster.amazonaws.com";
    settings.port = 5439;
    settings.user = "username";
    settings.password = "password";
    settings.database = "dev";
    settings.use_ssl = true;
    
    // Connect and query
    conn->connect(settings);
    
    auto deadline = rs::util::make_deadline(std::chrono::seconds(30));
    auto result = conn->execute_query("SELECT version()", deadline);
    
    std::cout << "Version: " << result.rows[0][0] << std::endl;
    
    return 0;
}

Build Options

Database Selection

Option	Description
`-DTARGET_DATABASE=REDSHIFT`	Build Redshift ODBC driver
`-DTARGET_DATABASE=POSTGRESQL`	Build PostgreSQL ODBC driver
`-DTARGET_DATABASE=MYSQL`	Build MySQL ODBC driver (future)
`-DTARGET_DATABASE=SQLSERVER`	Build SQL Server ODBC driver (future)

Additional Options

Option	Default	Description
`BUILD_EXAMPLES`	ON	Build example applications
`BUILD_TESTING`	ON	Build unit and integration tests
`OPENSSL_USE_STATIC_LIBS`	OFF	Link OpenSSL statically

Build Scripts

build-database.sh - Database-specific builds:

# Show all options
./build-database.sh --help

# Build specific database drivers
./build-database.sh redshift     # Redshift-only driver
./build-database.sh postgresql   # PostgreSQL-only driver
./build-database.sh minimal      # Minimal Redshift (no examples/tests)

# Build options
./build-database.sh redshift --debug  # Debug build
./build-database.sh redshift --clean  # Clean first

setup-test-env.sh - ODBC environment setup:

# Source to set environment variables
source ./setup-test-env.sh

# Or run to check configuration
./setup-test-env.sh

CMake Presets (Alternative)

# List available presets
cmake --list-presets

# Use preset
cmake --preset redshift
cmake --build --preset redshift

Examples

The examples/ directory contains:

query_example: Basic connection and query execution
pg_handshake_example: Connection establishment and server parameters
extended_query_example: Prepared statements and transactions
multi_database_example: Shows database-specific build behavior

Run examples:

# After building
./build-redshift/examples/query_example your-host.com 5439 mydb user pass

ODBC Configuration

Local Configuration (Recommended for Development)

The project includes local ODBC configuration files for development and testing:

# Setup local ODBC environment
source ./setup-test-env.sh

# This sets:
# ODBCINI=./odbc.ini          # Data source definitions
# ODBCSYSINI=./               # Driver definitions (odbcinst.ini)

Configuration Files

odbc.ini - Data Source Names (DSNs):

[RedshiftTest]
Driver = ODBCPP
Description = Redshift Test Database
Server = your-cluster.redshift.amazonaws.com
Port = 5439
Database = dev
SSL = true

[PostgreSQLTest] 
Driver = ODBCPP
Description = PostgreSQL Test Database
Server = localhost
Port = 5432
Database = testdb
SSL = false

odbcinst.ini - Driver Definitions:

[ODBCPP]
Description = ODBCPP Multi-Database Driver
Driver64 = /path/to/build-redshift/libodbcpp.dylib
Setup64 = /path/to/build-redshift/libodbcpp.dylib
FileUsage = 1

System Installation (Optional)

# Install driver system-wide
sudo cp build-redshift/libodbcpp.dylib /usr/local/lib/
sudo odbcinst -i -d -f odbcinst.ini

# Add DSNs system-wide
sudo odbcinst -i -s -f odbc.ini

Testing

Test Coverage

Total Tests: 17 (10 unit + 7 integration)
Success Rate: 100% (17/17 unit tests, 39/39 integration tests)
Coverage: All ODBC APIs, descriptors, prepared statements, column binding

Running Tests

# Setup test environment first
source ./setup-test-env.sh

# Build and run all tests
./build-database.sh redshift
ctest --test-dir build-redshift

# Run specific test categories
ctest --test-dir build-redshift -L unit         # 10 unit tests
ctest --test-dir build-redshift -L integration  # 8 integration test suites

# Test specific functionality
ctest --test-dir build-redshift -R prepared_statements
ctest --test-dir build-redshift -R descriptor_apis
ctest --test-dir build-redshift -R bind_col

Test Requirements

Unit Tests: No external dependencies
Integration Tests: Require valid DSN configuration in odbc.ini
Database Access: Integration tests need actual Redshift/PostgreSQL connection

Architecture

core/
├── database/           # Database abstraction layer
│   ├── i_database_connection.h    # Generic connection interface
│   ├── i_protocol_parser.h        # Protocol parser interface
│   ├── database_factory.{h,cpp}   # Factory for database connections
│   ├── generic_database_connection.{h,cpp}  # Generic implementation
│   └── postgres/       # PostgreSQL/Redshift protocol implementation
│       ├── pg_protocol_parser.{h,cpp}
│       └── pg_messages.h
├── transport/          # Network transport layer
│   ├── i_transport.h   # Transport interface
│   ├── socket_transport.{h,cpp}   # TCP sockets
│   └── tls_transport.{h,cpp}      # TLS/SSL transport
└── util/              # Utilities
    ├── deadline.h     # Timeout handling
    ├── errors.h       # Error types
    └── platform.h     # Platform abstractions

Adding New Database Support

Create protocol parser:

mkdir -p core/database/mysql
# Implement mysql_protocol_parser.{h,cpp}

Implement IProtocolParser interface:

class MySQLProtocolParser : public IProtocolParser {
    // Implement all virtual methods
};

Update factory (automatic via conditional compilation)

Build:

cmake -DTARGET_DATABASE=MYSQL -B build-mysql

Contributing

Fork the repository
Create feature branch: git checkout -b feature/mysql-support
Make changes and add tests
Ensure all tests pass: ctest --test-dir build
Submit pull request

License

[Your License Here]

Support

Issues: GitHub Issues
Documentation: See examples/ directory
Architecture: See docs/ directory (if available)

Name		Name	Last commit message	Last commit date
Latest commit History 53 Commits
.github/workflows		.github/workflows
cmake		cmake
core		core
examples		examples
install		install
odbc		odbc
tests		tests
.gitignore		.gitignore
BUILD_SYSTEM.md		BUILD_SYSTEM.md
CHANGELOG.md		CHANGELOG.md
CMakeLists.txt		CMakeLists.txt
CMakePresets.json		CMakePresets.json
ODBC_INTEGRATION.md		ODBC_INTEGRATION.md
README.md		README.md
ROADMAP.md		ROADMAP.md
build-database.sh		build-database.sh
debug_prepared.cpp		debug_prepared.cpp
odbc.ini		odbc.ini
odbcinst.ini		odbcinst.ini
odbcpp.dsn		odbcpp.dsn
root.crt		root.crt
setup-test-env.sh		setup-test-env.sh

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