datasource

I am reading the Java JDBC specification (vr. 4) and I encountred this statement: DataSource — this interface was introduced in the JDBC 2.0 Optional Package API. It is preferred over DriverManager because it allows details about the underlying data source to be transparent to the application What I am trying to understand is what the difference is between a Connection and a DataSource , and why it exists. I mean, the block above says that the details about a datasource is transparent to the application, but wouldn't externalizing database properties such as username, password, url etc in a

I am trying to send an email with an attachment file in Java. When I send the email without an attachment I receive the email, but when I add the attachment I don't receive anything and I don't get any error messages. This is the code I am using: public void send () throws AddressException, MessagingException{ //system properties Properties props = new Properties(); props.put("mail.smtp.localhost", "localhost"); props.put("mail.smtp.host",Configurations.getInstance().email_serverIp); /* * create some properties and get the default Session */ session = Session.getDefaultInstance(props, null); /

I have a Grails app that loads its data from xml files and delivers rss feeds via rome. I don't have any domain classes and my app has no datasource. I don't want Grails to load an in memory hsql db when the application has no need for it. Deleting the DataSource.groovy file prevents me from launching the web app, it seems as though the datasource is required, but is there anything I can do if my application doesn't need a datasource? The following steps work for a new app (Grails 1.1.1) to run without using a datasource: grails create-app nodb cd nodb grails uninstall-plugin hibernate rm

I'm using .NET 2.0 and I'm trying to bind a combobox's Datasource to a sorted dictionary. So the error I'm getting is "DataMember property 'Key' cannot be found on the Datasource". SortedDictionary<string, int> userCache = UserCache.getSortedUserValueCache(); userListComboBox.DataSource = new BindingSource(userCache, "Key"); //This line is causing the error userListComboBox.DisplayMember = "Key"; userListComboBox.ValueMember = "Value"; SortedDictionary<string, int> userCache = new SortedDictionary<string, int> { {"a", 1}, {"b", 2}, {"c", 3} }; comboBox1.DataSource = new BindingSource(userCache

I'm trying to follow Sun's JDBC tutorial at http://java.sun.com/docs/books/tutorial/jdbc/basics/connecting.html It gives the following example code: DataSource ds = (DataSource) org.apache.derby.jdbc.ClientDataSource() ds.setPort(1527); ds.setHost("localhost"); ds.setUser("APP") ds.setPassword("APP"); Connection con = ds.getConnection(); This code doesn't compile because the DataSource interface has none of these methods, except for the getConnection() method invoked last. (Here's the javadoc: http://java.sun.com/javase/6/docs/api/javax/sql/DataSource.html ) What am I missing? Edit: I'm