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/** * Get Schemas: Retrieves the catalog names available in * this database. The results are ordered by catalog name. * * @param conn the Connection object * @return list of all schemas. * @exception Failed to get the Get Schemas. */ public static List<String> getSchemas(Connection conn) throws Exception { ResultSet schemas = null; try { DatabaseMetaData meta = conn.getMetaData(); if (meta == null) { return null; } schemas = meta.getSchemas(); if (schemas == null) { return null; } List<String> list = new ArrayList<String>(); while (schemas.next()) { String schema = schemas.getString(1); //"TABLE_CATALOG" if (schema != null) { list.add(schema); } } return list; } finally { DatabaseUtil.close(schemas); } } }

Note The java.sql.Connection object is an interface, and you need an implementing class for it. Please remember that you do not need to implement this interface, because Oracle s JDBC driver provides such an implementation.

The following example uses an Oracle JDBC driver to connect to an Oracle database instance located at server TIGER and port number 1521 with an SID (Oracle database ID) called scorpian. To make sure you have the right values for the SID and port, you may view the tnsnames.ora file (<oracle-installation-directory>/OraHome9i/network/admin/tnsnames.ora). The following shows a portion of the tnsnames.ora file for an Oracle 9i installation. As you can observe, tiger is the server name, tiger.usa.com is the full server name, and scorpian is an SID. ... SCORPIAN.USA.COM = (DESCRIPTION = (ADDRESS_LIST = (ADDRESS = (PROTOCOL = TCP)(HOST = TIGER)(PORT = 1521)) ) (CONNECT_DATA = (SERVER = DEDICATED) (SERVICE_NAME = scorpian.tiger.usa.com) ) ) ...

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In the style sheet file, the style rule listbox includes the position property set to value relative so as to assign it a position in relation with its container (which is usually the browser window when not defined) The left property is set to 10px to make the suggestion box appear at the distance of 10px from the left border of the browser window The Margin property is set to value 10px to keep the distance of 10px from the input text field above it The Width property is set to 200px to make the names (that will be displayed in this box) occupy 200px The background-color and color properties are set to value #000 and #fff respectively to make the background color of the box to turn black, and the names to appear in white color.

Figure 9-5. Invoking GetSchemas for MySQL (XML output)

Solution (Fragment)

In this solution, I will present the most important code, and then I will expand this fragment to a class and some client code so you can see it really working. Connection conn = null; try { // Load the JDBC driver String driverName = "oracle.jdbc.driver.OracleDriver"; Class.forName(driverName); // // Create a connection to the database //

The border property is set to value 2px solid #000 to make a solid black border of 2px thickness appear around the names displayed in the suggestion box Moving along to our jQuery code, we hide the div element of class listbox at the beginning, because we only want to display it when user types a character in the input text field We attach the keyup() event to the input text field, which is assigned the class name userid, so that its event handling function is fired when the user releases a key on the keyboard We then retrieve the character typed by the user in the input text field of class userid and store it the variable uid; then define a variable data that will store a string userid=uid where uid holds the first character (of the name) entered by the user.

Figure 9-6. Invoking GetSchemas for Oracle (XML output)

String serverName = "TIGER"; String portNumber = "1521"; String sid = "scorpian"; String url = "jdbc:oracle:thin:@" + serverName + ":" + portNumber + ":" + sid; String username = "octopus"; String password = "octopus"; conn = DriverManager.getConnection(url, username, password); // here the Connection object is ready to be used. } catch (ClassNotFoundException e) { // Could not find the database driver // When you are here, it means that your .jar file (which contains // the Driver class) has not been added to the CLASSPATH properly // You have to fix this problem before you // can establish a connection to an Oracle database. // deal with the exception... } catch (SQLException e) { // Could not connect to the database. // Either database server is down, or one/more of // your parameters is/are not specified correctly. // deal with the exception... } finally { // close the Connection object DatabaseUtil.close(conn); }

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