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/* to use WebSQL or the SQLite plugin (https://github.com/davibe/Phonegap-SQLitePlugin) with the same function) */
executeSqlBridge: function(tx, sql, params, dataHandler, errorHandler) {
		var self = this;
		if (typeof self.db.dbPath !== 'undefined') {
			//Native SQLite DB with phonegap : https://github.com/davibe/Phonegap-SQLitePlugin/
			//this is a native DB, the method signature is different:

			var sqlAndParams = [sql].concat(params);

			var cb = function(res) {
				//in WebSQL : result.rows.item(0)
				//in the phonegap plugin : res.rows[0]
				res.rows.item = function(i) {
					return this[i];
				};

				//the result callback hasn't the tx param
				dataHandler(tx, res);
			};

			tx.executeSql(sqlAndParams, cb, errorHandler);
		} else {
			//Standard WebSQL
			tx.executeSql(sql, params, dataHandler, errorHandler);
		}
	},