zuzu-rust 0.6.0

Rust implementation of ZuzuScript
Documentation 
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from test/more import *;

requires_capability( "db" );

from std/db import DB;
from std/defer import Guard;

let dbh := DB.temp( { auto_commit: true } );
dbh.prepare( "create table lifecycle (label text)" ).execute();
let insert := dbh.prepare( "insert into lifecycle (label) values (?)" );

{
	dbh.begin();
	let Object rollback_guard := new Guard( callback: function() {
		dbh.rollback();
	} );
	insert.execute("rolled");
}

{
	let committed := false;
	dbh.begin();
	let Object rollback_guard := new Guard( callback: function() {
		if ( not committed ) {
			dbh.rollback();
		}
	} );
	insert.execute("kept");
	dbh.commit();
	committed := true;
}

let q := dbh.prepare( "select label from lifecycle order by rowid" );
q.execute();
let rows := q.all_array();

is( rows.length(), 1, "defer guard rolled back uncommitted transaction" );
is( rows[0][0], "kept", "committed transaction survives guarded scope exit" );

done_testing();