TranceSQL provides an easy to use, high performance data access interface for SQL databases. TranceSQL is an alternative to using an ORM which provides an API for creating and executing commands and mapping query results back to objects. You can think of it as sitting in between an ORM like Entity Framework in which queries are generated from object-based DSLs such as LINQ and lightweight clients like Dapper that map results but require the query be provided as a string.

TranceSQL provides a command API for modeling SQL queries and an extensible translation layer for converting results to usable objects. The command definition and command "rendering" are separated into two different steps, allowing for differences between different dialects of SQL to be accounted for in the resulting SQL command. For example SQL Server uses the TOP keyword to indicate the maximum number of rows to return from a SELECT, whereas other vendors use LIMIT or require specialized WHERE clauses. TranceSQL provides platform specific drivers to render compatible SQL code for several dialects:

• Postgres
• Microsoft SQL Server
• Sqlite
• MySql
• Oracle

For more information, see documentation in the wiki

TranceSQL commands leverage collection initialization and implicit type conversion extensively to make code generation simple.

public string GetUsername(int id)
{
	var database = new SqlServerDatabase(connectionString);
	var command = new Command(database)
	{
		new Select
		{
			Column = { "FirstName" }
			From = "Users"
			Where = Condition.Equal("UserID", id)
		}
	};

	// This executes as "SELECT [FirstName] FROM [Users] WHERE [UserID] = @P1"
	var user = command.Fetch<User>();

	return user.FirstName;
}

Values can be included in various query building methods. These values are automatically converted to parameters when the query is executed. In addition, parameter converters may be added to provide application-specific conversion of values to parameters.

To create a automatic parameter, use the Value class.

Deferred execution provides a way to execute multiple queries within a single command and maps the results back to each request. This can be useful for keeping your code simple when building components that compose. For example if you need some user specific information along with some page specific queries.