Crystal ODBC driver implements crystal-db API and is a wrapper around unixODBC.

unixODBC is an open-source ODBC-library that you can run on non-Windows platforms. It is the glue between odbc (this shard) and your SQL driver.

If you want to use odbc with unixODBC make sure you are running unixODBC 2.3.7!

1. Install unixODBC and your database's ODBC driver:

   Ubuntu/Debian:

   sudo apt-get install unixodbc unixodbc-dev
   # For SQLite: sudo apt-get install libsqliteodbc
   # For MSSQL: sudo apt-get install msodbcsql17
   # For Oracle: Download from Oracle website

   macOS:

   brew install unixodbc
   # For SQLite: brew install sqliteodbc
   # For MSSQL: brew tap microsoft/mssql-release && brew install msodbcsql17

2. Add the dependency to your shard.yml:

   dependencies:
     odbc:
       github: naqvis/crystal-odbc

3. Run shards install

require "db"
require "odbc"

DB.open "odbc://DSN=mydb;UID=user;PWD=password" do |db|
  db.exec "create table contacts (name text, age integer)"
  db.exec "insert into contacts values (?, ?)", "John Doe", 30

  puts db.scalar "select max(age) from contacts" # => 30

  db.query "select name, age from contacts" do |rs|
    rs.each do
      puts "#{rs.read(String)} (#{rs.read(Int32)})"
    end
  end
end

Different databases use different connection string formats:

# Using DSN (Data Source Name)
DB.open "odbc://DSN=mydb;UID=user;PWD=password"

# SQLite (file-based)
DB.open "odbc://Driver=SQLITE3;Database=/path/to/database.db"

# SQL Server
DB.open "odbc://Driver=ODBC Driver 17 for SQL Server;Server=localhost;Database=mydb;UID=user;PWD=password"

# Oracle
DB.open "odbc://Driver=Oracle in OraClient19Home1;DBQ=localhost:1521/XE;UID=user;PWD=password"

Configure ODBC behavior using environment variables:

export ODBC_CONNECTION_TIMEOUT=30
export ODBC_QUERY_TIMEOUT=30
export ODBC_ENABLE_TRACING=true
export ODBC_TRACE_FILE=/tmp/odbc.log

Refer to crystal-db for more usage instructions.

To run all tests:

crystal spec

1. Fork it (https://github.com/naqvis/crystal-odbc/fork)
2. Create your feature branch (git checkout -b my-new-feature)
3. Commit your changes (git commit -am 'Add some feature')
4. Push to the branch (git push origin my-new-feature)
5. Create a new Pull Request

• Ali Naqvi - creator and maintainer