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I will now break this program down and discuss the importance of each line: Lines 1 5: These lines import the required classes and interfaces from the java.sql package. Lines 8 15: The getConnection() method loads the proper driver for the database I intend to use. In this case, I used Microsoft Access to create the database, which uses ODBC. To handle ODBC databases, a JDBC-ODBC bridge acts as the driver. I am using the method Class.forName() to load the driver. This method gets a Connection object from the DriverManager class. All interactions with the database happen through this Connection object. Lines 22 26: These lines generate a SQL query and retrieve data from the database. First, I get a Connection object and then get a Statement object from the Connection object. A Statement object is basically used to perform a single SQL statement. In this case, I used the executeQuery() method to execute the simple SELECT statement shown. Lines 27 30: The ResultSet object contains the retrieved data from the database. A ResultSet is a container that holds the results of the query. A ResultSet works as an iterator, as shown in the code.

Figure 9-9. Invoking GetForeignKeys for MySQL (XML output)

Figure 8-15. The available options get highlighted on hovering over them On clicking on any name, it appears in the input text field as shown in Figure 8-16:

This code shows how to pass additional properties using a database URL: import java.sql.DriverManager; import java.sql.Connection; ... // // define and set connection properties using a database URL // String databaseURL = "jdbc:mysql://localhost/snipit user=root"+ "&password=rootp&useUnicode=true&characterEncoding=utf8"; // // create Connection object // Connection conn = DriverManager.getConnection(databaseURL);

You can also pass connection properties by using java.util.Properties and a database URL, as shown here: import java.util.Properties; import java.sql.DriverManager; import java.sql.Connection; ... // // define and set connection properties // Properties props = new Properties(); props.put("user", "root"); props.put("password","rootp"); // add additional connection properties to the database URL String databaseURL = "jdbc:mysql://localhost/snipit " + "useUnicode=true&characterEncoding=utf8";

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Figure 8-16. The clicked option appears in the input text field Let's examine the database solution. We start by retrieving the character sent from the JavaScript file (though data parameter) with the help of the $_POST array (since the request was sent via HTTP POST method) and storing it in variable $name. I'll skip the DB connection code, as that will vary according to your setup. The interesting part comes when writing a SQL query to retrieve all the names from the info table that begins with the character stored in $name (which was typed by the user in the input text field). We execute the SQL query, and the rows returned by the table as the outcome of the query are stored in the $results array. We then retrieve each name stored in the $results array, one by one, using a while loop and sending each nane to the JavaScript file after enclosing them in <li> tags, because of course we want to generate names in the form of list items.

Figure 9-10. Invoking GetForeignKeys for Oracle (XML output)

// // create Connection object // Connection conn = DriverManager.getConnection(databaseURL, props); For more information about the java.sql.Connection properties, their definitions, and their default values, refer to http://dev.mysql.com/doc/connector/j/en/cj-driver-classname. html#id2624462.

Now, we get the names beginning with any character that we type in the input text field. So, if we type character k , we get all the names beginning with character k as shown in Figure 8-17:

In general, to get a database Connection object (that is, a java.sql.Connection) object, you need to provide three values: a database URL, the database user, and the database user s password. Some vendors (such as Oracle) provide additional properties (such as defaultRowPrefetch and defaultBatchValue) for their drivers. Also, I will show how to use Oracle roles for user logon (such as SYS). You can use the DriverManager s getConnection() method to pass additional properties; its signature is as follows: import java.sql.Connection; import java.util.Properties; ... public static Connection getConnection(String url, Properties info)

To get the list of available SQL data types used by a database, you can use the DatabaseMetaData.getTypeInfo() method, which retrieves a description of all the standard SQL types supported by this database. This method returns the result as a ResultSet object, which is not very useful for web-based applications. The results of this method are ordered by DATA_TYPE and then by how closely the data type maps to the corresponding JDBC SQL type.

The following signature takes a URL, together with a Properties object that specifies a username and password (perhaps among other things): getConnection(String URL, Properties info); where the URL is of this form: jdbc:oracle:<drivertype>:@<database> In addition to the URL, use an object of the standard Java Properties class as input. For example: java.util.Properties info = new java.util.Properties(); info.put ("user", "scott"); info.put ("password","tiger"); info.put ("defaultRowPrefetch","15"); Connection conn = DriverManager.getConnection("jdbc:oracle:oci:@", info); Oracle 10 s JDBC drivers recognize an additional driver properties; see http://www.oracle.com/ technology/tech/java/sqlj_jdbc/htdocs/jdbc_faq.htm for more information.

Figure 8-17. The options in the suggestion box change on the basis of first character typed in input text field

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