Add Ruby bindings for chDB C++ library

.gitignore

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+*.so
+*.bundle
+*.swp
+*.log
+*.o
+
+Gemfile.lock
+.rspec_status
+.ruby-version
+.vscode
+
+doc/
+deps/
+gems/
+issues/
+pkg/
+ports/
+tmp/
+vendor/
+test/
+testdb/
+ext/chdb/include/
+ext/chdb/lib/

.rspec

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+--format documentation
+--color
+--require spec_helper
+--order rand

.rubocop.yml

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+AllCops:
+  Exclude:
+    - 'vendor/**/*'
+    - 'spec/**/*' 
+    - 'tmp/**/*'
+    - 'ext/**/extconf.rb'
+
+  NewCops: enable
+
+  TargetRubyVersion: 3.1
+
+  AutoCorrect: true
+
+  SuggestExtensions: false
+
+Style:
+  StringLiterals:
+    EnforcedStyle: double_quotes
+
+  ParameterLists:
+    EnforcedStyle: compact
+
+  RedundantSelf:
+    Enabled: true
+
+  ModifierForm:
+    AllowModifierForm: true
+
+Layout:
+  LineLength:
+    Max: 120
+
+  FirstParameterIndentation:
+    Enabled: true
+    EnforcedStyle: indented
+
+  Indentation:
+    Width: 2
+
+Metrics:
+  ClassLength:
+    Max: 200
+
+  MethodLength:
+    Max: 20
+
+  ParameterLists:
+    Max: 5
+
+Lint/AmbiguousOperator:
+  Enabled: false
+
+Style/Documentation:
+  Enabled: false 
+
+Style/AccessModifierDeclarations:
+  Enabled: false 

CHANGELOG.md

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+# chdb-ruby Changelog
+
+## [Unreleased]

Gemfile

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+# frozen_string_literal: true
+
+source 'https://rubygems.org'
+
+gemspec
+
+group :test do
+  gem 'rake-compiler', '1.2.9'
+  gem 'rake-compiler-dock', '1.9.1'
+  gem 'rspec', '3.12.0'
+end
+
+group :development do
+  gem 'rdoc', '6.12.0'
+  gem 'rubocop', '1.74.0', require: false
+end

INSTALLATION.md

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+
+# Installation and Using chdb-ruby extensions
+
+This document will help you install the `chdb-ruby` ruby gem. 
+
+## Installation
+
+### Native Gems 
+
+Native (precompiled) gems are available for recent Ruby versions on these platforms:
+
+- `aarch64-linux` 
+- `arm64-darwin` 
+- `x86_64-linux`
+- `x86_64-darwin`
+
+If you are using one of these Ruby versions on one of these platforms, the native gem is the recommended way to install chdb-ruby.
+
+`chdb-ruby` gem does not provide a pure Ruby implementation. Installation will fail if your platform is unsupported.
+
+## Post-Installation: Setting Up libchdb C++ Library
+
+After installing the `chdb-ruby` gem, you must also install the `libchdb` C++ library locally. If the library path is not in your system's default search paths, you'll need to configure the runtime library loading path.
+
+### 1. Download the C++ Library
+
+You can either:
+- Use the automated installation script:
+  ```bash
+  curl -sSL https://github.com/chdb-io/chdb-io.github.io/blob/main/install_libchdb.sh | bash
+  ```
+
+- Or manually download from chdb releases(example for arm64-darwin (v3.12)):
+  ```bash
+  wget https://github.com/chdb-io/chdb/releases/download/v3.12/macos-arm64-libchdb.tar.gz
+  tar -xzf macos-arm64-libchdb.tar.gz
+  ```
+
+### 2. Configure Library Path
+- MacOS:
+    ```bash
+    export DYLD_LIBRARY_PATH="/path/to/libchdb:$DYLD_LIBRARY_PATH"
+    ```
+  (Add to your shell config file like ~/.zshrc for persistence)
+
+- Linux:
+    ```bash
+    export LD_LIBRARY_PATH="/path/to/libchdb:$LD_LIBRARY_PATH"
+    ```
+
+### 3. Verify Installation
+- Ruby:
+    ```bash
+    require 'chdb'
+    ```
+
+- Troubleshooting(If you get "Library not loaded" errors):
+  - Verify the path in DYLD_LIBRARY_PATH/LD_LIBRARY_PATH is correct
+  - Ensure you downloaded the right version for your platform

LICENSE.txt → LICENSE

@@ -188,7 +188,7 @@ Copyright 2025 chDB, Inc.
       same "printed page" as the copyright notice for easier
       identification within third-party archives.
 
-   Copyright 2023 chDB, Inc.
+   Copyright 2025 chDB, Inc.
 
    Licensed under the Apache License, Version 2.0 (the "License");
    you may not use this file except in compliance with the License.

README.md

@@ -4,5 +4,119 @@
 
 [![chDB-ruby](https://github.com/chdb-io/chdb-ruby/actions/workflows/chdb.yml/badge.svg)](https://github.com/chdb-io/chdb-ruby/actions/workflows/chdb.yml)
 
-# chdb-ruby
-[chDB](https://github.com/chdb-io/chdb) ruby bindings and chDB cli.
+# Ruby Interface for chdb
+
+## Overview
+
+This library allows Ruby programs to use the chDB embedded analytical database (https://github.com/chdb-io/chdb).
+
+**Designed with SQLite3-compatible API style** - If you're familiar with Ruby's sqlite3 gem, you'll feel right at home with chdb-ruby's similar interface design.
+
+Note that this module is only compatible with ChDB 3.0.0 or newer.
+
+* Source code: https://github.com/chdb-io/chdb-ruby
+* Download: http://rubygems.org/gems/chdb-ruby
+* Documentation: https://clickhouse.com/docs/chdb
+
+## Quick start
+
+``` ruby
+require 'chdb'
+
+# Open a database
+db = ChDB::Database.new('test_db', results_as_hash: true)
+
+# Create a table
+rows = db.execute <<-SQL
+  CREATE TABLE test_table(
+    id Int32,
+    name String)
+    ENGINE = MergeTree()
+    ORDER BY id);
+SQL
+
+# Execute a few inserts
+{
+      1 => 'Alice',
+      2 => 'Bob'
+}.each do |pair|
+  db.execute 'INSERT INTO test_table VALUES ( ?, ? )', pair
+end
+
+# Find a few rows
+db.execute('SELECT * FROM test_table ORDER BY id') do |row|
+  p row
+end
+# [{ 'id' => '1', 'name' => 'Alice' },
+#  { 'id' => '2', 'name' => 'Bob' }]
+
+# Open another database
+db = ChDB::Database.new 'test2.db'
+
+# Create another table
+rows = db.execute <<-SQL
+  CREATE TABLE test2_table(
+    id Int32,
+    name String)
+    ENGINE = MergeTree()
+    ORDER BY id");
+SQL
+
+# Execute inserts with parameter markers
+db.execute('INSERT INTO test2_table (id, name)
+            VALUES (?, ?)', [3, 'Charlie'])
+
+db.execute2('SELECT * FROM test2_table') do |row|
+  p row
+end
+# [['id', 'name'], [3, 'Charlie']],
+```
+
+## Thread Safety
+
+When using `ChDB::Database.new` to open a session, all read/write operations within that session are thread-safe. However, currently only one active session is allowed per process. Therefore, when you need to open another session, you must first close the previous session.
+
+For example, the following code is fine because only the database
+instance is shared among threads:
+
+```ruby
+require 'chdb'
+
+db = ChDB::Database.new ":memory:'
+
+latch = Queue.new
+
+ts = 10.times.map {
+  Thread.new {
+    latch.pop
+    db.execute 'SELECT 1'
+  }
+}
+10.times { latch << nil }
+
+p ts.map(&:value)
+```
+
+Other instances can be shared among threads, but they require that you provide
+your own locking for thread safety.  For example, `ChDB::Statement` objects
+(prepared statements) are mutable, so applications must take care to add
+appropriate locks to avoid data race conditions when sharing these objects
+among threads.
+
+It is generally recommended that if applications want to share a database among
+threads, they _only_ share the database instance object. Other objects are
+fine to share, but may require manual locking for thread safety.
+
+## Support
+
+### Installation
+
+If you're having trouble with installation, please first read [`INSTALLATION.md`](./INSTALLATION.md).
+
+### Bug reports
+
+You can file the bug at the [github issues page](https://github.com/chdb-io/chdb-ruby/issues).
+
+## License
+
+This library is licensed under `Apache License 2.0`, see [`LICENSE`](./LICENSE).

Rakefile

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+# frozen_string_literal: true
+
+require 'bundler'
+CHDB_SPEC = Bundler.load_gemspec('chdb.gemspec')
+
+task default: %i[rubocop compile test]

chdb.gemspec

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+# frozen_string_literal: true
+
+begin
+  require_relative 'lib/chdb/version'
+rescue LoadError
+  puts 'WARNING: could not load ChDB::VERSION'
+end
+
+Gem::Specification.new do |s|
+  s.name = 'chdb-ruby'
+  s.version = defined?(ChDB::VERSION) ? ChDB::VERSION : '0.0.0'
+
+  s.summary = 'Ruby library to interface with the chDB database engine (https://clickhouse.com/docs/chdb).'
+  s.description = <<~TEXT
+    Ruby library to interface with the chDB database engine (https://clickhouse.com/docs/chdb). Precompiled
+    binaries are available for common platforms for recent versions of Ruby.
+  TEXT
+
+  s.authors = ['Xiaozhe Yu', 'Auxten Wang']
+
+  s.licenses = ['Apache-2.0']
+
+  s.required_ruby_version = Gem::Requirement.new('>= 3.1')
+
+  s.homepage = 'https://github.com/chdb-io/chdb-ruby'
+  s.metadata = {
+    'homepage_uri' => 'https://github.com/chdb-io/chdb-ruby',
+    'bug_tracker_uri' => 'https://github.com/chdb-io/chdb-ruby/issues',
+    'changelog_uri' => 'https://github.com/chdb-io/chdb-ruby/blob/main/CHANGELOG.md',
+    'source_code_uri' => 'https://github.com/chdb-io/chdb-ruby',
+
+    # https://guides.rubygems.org/mfa-requirement-opt-in/
+    'rubygems_mfa_required' => 'true'
+  }
+
+  s.files = [
+    # 'CHANGELOG.md',
+    'INSTALLATION.md',
+    'LICENSE',
+    'README.md',
+    'lib/chdb.rb',
+    'lib/chdb/constants.rb',
+    'lib/chdb/data_path.rb',
+    'lib/chdb/database.rb',
+    'lib/chdb/errors.rb',
+    'lib/chdb/local_result.rb',
+    'lib/chdb/parameter_binding.rb',
+    'lib/chdb/result_handler.rb',
+    'lib/chdb/result_set.rb',
+    'lib/chdb/sql_processor.rb',
+    'lib/chdb/statement.rb',
+    'lib/chdb/version_info.rb',
+    'lib/chdb/version.rb'
+  ]
+
+  s.rdoc_options = ['--main', 'README.md']
+
+  s.add_dependency 'csv', '~> 3.1'
+
+  # s.extensions << 'ext/chdb/extconf.rb'
+end

dependencies.yml

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+chdb:
+  version: "3.1.2"