NDXSQLite

Professional SQLite Library for Free Pascal/Lazarus

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Overview

NDXSQLite is a modern, thread-safe SQLite wrapper for Free Pascal and Lazarus. It provides a clean, object-oriented API for database operations with support for advanced features like connection pooling, schema migrations, and transparent encryption via SQLCipher.

Key Features

• Native SQLite API - Direct bindings without SQLDB dependency
• Thread-Safe - Full thread safety with connection pooling
• SQLCipher Support - Transparent AES-256 database encryption
• Schema Migrations - Version-controlled database schema evolution
• Cross-Platform - Linux, Windows, and macOS support
• TDataSet Compatible - Works with Lazarus DB-aware controls
• Comprehensive - 148 working examples covering all features

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Quick Start

Installation

1. Clone or download the repository
2. Add the source paths to your project:

-Fu/path/to/src-NDXSQLite/src
-Fu/path/to/src-NDXSQLite/src/core
-Fu/path/to/src-NDXSQLite/src/api

Basic Usage

program QuickDemo;

{$mode objfpc}{$H+}

uses
ndxsqliteconnection, ndxsqliteconnectionoptions;

var
Options: TNDXSQLiteConnectionOptions;
Conn: TNDXSQLiteConnection;
begin
Options := TNDXSQLiteConnectionOptions.Create;
try
Options.DatabasePath := 'myapp.db';
Options.JournalMode := jmWAL;

Conn := TNDXSQLiteConnection.Create(Options);
try
Conn.Open;

// Create table
Conn.ExecuteNonQuery(
'CREATE TABLE IF NOT EXISTS users (id INTEGER PRIMARY KEY, name TEXT)');

// Insert with parameters
Conn.ExecuteNonQuery(
'INSERT INTO users (name) VALUES (?)', ['Alice']);

// Query
WriteLn('Total: ', Conn.ExecuteScalar('SELECT COUNT(*) FROM users'));

Conn.Close;
finally
Conn.Free;
end;
finally
Options.Free;
end;
end.

With Encryption (SQLCipher)

Options.DatabasePath := 'secure.db';
Options.EncryptionKey := 'my-secret-key';  // AES-256 encryption

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Features

Core

Feature	Description
Connection Management	Auto-close timeout, connection states, action logging
Transactions	Deferred, Immediate, Exclusive modes with savepoints
Query Execution	ExecuteNonQuery, ExecuteScalar, ExecuteQuery with parameters
PRAGMA Support	Journal mode, sync mode, cache size, foreign keys, etc.

Advanced

Feature	Description
Connection Pool	Thread-safe pooling with statistics
Schema Migrations	Version tracking, up/down migrations
Online Backup	Progress reporting, integrity verification
Incremental BLOB I/O	Stream-based large binary handling
Full-Text Search	FTS5 helper functions
JSON Support	JSON extraction and manipulation
Virtual Tables	Custom virtual table framework

Platform Support

Platform	Architecture	Status
Linux	x86_64, aarch64	Supported
Windows	x86, x64	Supported
macOS	Intel, Apple Silicon	Supported
Snap	x86_64	Supported
Flatpak	x86_64	Supported

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Documentation

Document	Description
Quick Start Guide	Installation and first program
API Reference	Complete class and method documentation
Changelog	Version history
Building	Compilation instructions
Table of Contents	Full documentation index

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Examples

The examples/console/ directory contains 148 working examples:

01_BasicConnection     - Simple connection and queries
02_Transactions        - Transaction handling
08_ConnectionPool      - Thread-safe connection pooling
11_BackupRestore       - Online database backup
14_Migrations          - Schema version control
43_EncryptedDatabase   - SQLCipher encryption
148_SQLCipherEncryption - Advanced encryption scenarios

Run an example:

cd examples/console/01_BasicConnection
fpc -Fu../../../src BasicConnection.lpr
./BasicConnection

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Requirements

• Compiler: Free Pascal 3.2.0 or later
• IDE: Lazarus 2.0+ (optional)
• SQLite: Automatically detected from system paths
• SQLCipher: Optional, for encryption support

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Project Structure

src-NDXSQLite/
├── src/                    # Source code
│   ├── core/               # Connection, options, types
│   ├── api/                # SQLite3 API bindings
│   ├── advanced/           # Backup, migrations, BLOB, etc.
│   ├── pool/               # Connection pooling
│   └── ...
├── tests/                  # Test suites
├── examples/               # Working examples
├── docs/                   # Documentation
└── .github/workflows/      # CI/CD configuration

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Contributing

Contributions are welcome. Please ensure:

1. Code compiles without warnings
2. Tests pass
3. Examples work correctly
4. Documentation is updated

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License

MIT License - See LICENSE for details.

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Author

Nicolas DEOUX

• 📧 NDXDev@gmail.com
• 💼 LinkedIn
• 🐙 GitHub

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Last updated: January 2026 | SQLite 3.45.0+