A powerful, single-file C# application that compares database schemas across different environments and generates migration scripts. Supports PostgreSQL, MySQL, SQL Server, and SQLite.

• Lightning-fast schema comparison across all major databases
• Beautiful, colorful console output with rich formatting
• Multiple output formats: Console, SQL, JSON, Markdown
• Comprehensive change detection: tables, columns, indexes, constraints
• Production-ready migration script generation
• Zero-installation single-file deployment

You can clone the repo and put the Schemer.cs file somewhere you like. Make sure you have the NET10 SDK or Runtime installed. (Currently still in preview)

You can run Schemer commands from the terminal.

Example using the test databases provided in this repository:

dotnet run schemer.cs
      --source "Data Source=schemer_source.db"
      --target "Data Source=schemer_target.db"
      --type sqlite

Beautiful, colorful console output with rich formatting showing:

• Summary statistics
• Missing, extra, and modified tables
• Detailed column-level differences

Generate production-ready migration scripts:

./schemer.cs ... --output sql --migration-name "update_user_schema"

Machine-readable JSON format for integration with other tools:

./schemer.cs ... --output json

Human-readable documentation format:

./schemer.cs ... --output markdown

postgres://username:password@hostname:5432/database
Host=hostname;Database=database;Username=username;Password=password

mysql://username:password@hostname:3306/database
Server=hostname;Database=database;Uid=username;Pwd=password

Server=hostname;Database=database;Integrated Security=true
Server=hostname;Database=database;User Id=username;Password=password

Data Source=database.db
Data Source=C:\path\to\database.sqlite

• .NET 10.0 preview
• Database-specific drivers (automatically included via NuGet packages)

The following NuGet packages are automatically included:

• Npgsql - PostgreSQL driver
• MySqlConnector - MySQL driver
• Microsoft.Data.SqlClient - SQL Server driver
• Microsoft.Data.Sqlite - SQLite driver
• Dapper - Micro ORM
• Spectre.Console - Rich console UI
• System.CommandLine - Command line parsing
• Newtonsoft.Json - JSON serialization

• Connection string validation with basic SQL injection prevention
• Credential masking in console output
• Timeout handling for long-running operations
• Retry logic with exponential backoff

This is a single-file application designed for simplicity and portability. Contributions are welcome! Please ensure any changes maintain the single-file architecture.