add tracing support. Enable with sqlite3.verbose()

lib/sqlite3.js

 var sqlite3 = module.exports = exports = require('./sqlite3_bindings');
-var sys = require("sys");
-
 
 var Database = sqlite3.Database;
 var Statement = sqlite3.Statement;
@@ -49,3 +47,23 @@ Database.prototype.each = function(sql) {
     statement.each.apply(statement, Array.prototype.slice.call(arguments, 1)).finalize();
     return this;
 }
+
+// Save the stack trace over EIO callbacks.
+sqlite3.verbose = function() {
+    var trace = require('./trace');
+    trace.extendTrace(Database.prototype, 'prepare');
+    trace.extendTrace(Database.prototype, 'get');
+    trace.extendTrace(Database.prototype, 'run');
+    trace.extendTrace(Database.prototype, 'all');
+    trace.extendTrace(Database.prototype, 'each');
+    trace.extendTrace(Database.prototype, 'exec');
+    trace.extendTrace(Database.prototype, 'close');
+    trace.extendTrace(Statement.prototype, 'bind');
+    trace.extendTrace(Statement.prototype, 'get');
+    trace.extendTrace(Statement.prototype, 'run');
+    trace.extendTrace(Statement.prototype, 'all');
+    trace.extendTrace(Statement.prototype, 'each');
+    trace.extendTrace(Statement.prototype, 'reset');
+    trace.extendTrace(Statement.prototype, 'finalize');
+    return this;
+};

lib/trace.js

+// Inspired by https://github.com/tlrobinson/long-stack-traces
+var EventEmitter = require('events').EventEmitter;
+var util = require('util');
+
+function extendTrace(object, property) {
+    var old = object[property];
+    object[property] = function(x) {
+        var error = new Error();
+        var name = object.constructor.name + '#' + property + '(' + 
+            Array.prototype.slice.call(arguments).map(function(el) {
+                return util.inspect(el, false, 0);
+            }).join(', ') + ')';
+
+        var last = arguments.length - 1;
+        var cb = arguments[last];
+        if (typeof arguments[last] === 'function') {
+            arguments[last] = function replacement() {
+                try {
+                    return cb.apply(this, arguments);
+                } catch (err) {
+                    if (err && err.stack && !err.__augmented) {
+                        err.stack = filter(err).join('\n');
+                        err.stack += '\n--> in ' + name;
+                        err.stack += '\n' + filter(error).slice(1).join('\n');
+                        err.__augmented = true;
+                    }
+                    throw err;
+                }
+            };
+        }
+        return old.apply(this, arguments);
+    };
+}
+exports.extendTrace = extendTrace;
+
+
+function filter(error) {
+    return error.stack.split('\n').filter(function(line) {
+        return line.indexOf(__filename) < 0;
+    });
+}