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1-9. What Is the JDBC API (in a Nutshell)

Figure 6-15. The news text scrolling toward the top border of the news box Then the news will start scrolling toward the top border of the news box slowly, and vanish as it crosses the top border, as shown in Figure 6-16.

The JDBC API is comprised of two Java packages (both are included in JDK 1.4): java.sql: This is the initial package that provides the API for accessing and processing data stored in a data source (usually a relational database) using the Java programming language. For details, please refer to the official documentation at http://java.sun.com/j2se/1.5.0/ docs/api/java/sql/package-summary.html. javax.sql: This is an extended package that provides the API for server-side data source access and processing from the Java programming language. For details, please refer to the official documentation at http://java.sun.com/j2se/1.5.0/docs/api/javax/sql/package-summary.html. As mentioned, the java.sql package provides the API for accessing and processing data stored in a data source (usually a relational database) using the Java programming language. This JDBC API includes a framework and architecture whereby different drivers (implemented by different database vendors) can be installed dynamically to access different data sources (see Figure 1-9). Although the JDBC API is mainly geared to passing SQL statements to a database, it provides for reading and writing data from any data source with a tabular format. The reader/writer facility, available through the javax.sql.RowSet group of interfaces, can be customized to use and update data from a spreadsheet, flat file, or any other tabular data source.

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public DemoCustomRowSet() { try { SyncFactory.registerProvider("MySyncProvider"); Hashtable env = new Hashtable(); env.put(SyncFactory.ROWSET_SYNC_PROVIDER, "MySyncProvider"); crs = new CachedRowSetImpl(env); crs.execute(); // load data from custom RowSetReader System.out.println("Fetching from RowSet..."); while(crs.next()) { displayData(); } if(crs.isAfterLast() == true) { System.out.println("We have reached the end"); System.out.println("crs row: " + crs.getRow()); } System.out.println("And now backwards..."); while(crs.previous()) { displayData(); } // end while previous

The javax.sql package supports the following concepts: The DataSource interface as an alternative to DriverManager for establishing a connection with a data source. 2 discusses DataSource in detail. Connection pooling Distributed transactions Row sets

Figure 6-16. The news text that is scrolled up disappears When all the news text is scrolled up, the first line of the news will appear at the bottom border of the window and will continue scrolling upward.

The core JDBC classes/interfaces are as follows: java.sql.DriverManager: The major task of the DriverManager class is to access the JDBC drivers and create java.sql.Connection (database connection) objects. java.sql.Connection: This interface represents a database connection. This is the key for accessing most of the database objects (such as tables, columns, and so on). java.sql.Statement: The Connection object creates Statement objects. You can use the Statement object to execute SQL statements and queries, which produce ResultSet objects (the result of executing SQL statements and queries). java.sql.PreparedStatement: The Connection object creates PreparedStatement (parameterized statement) objects. You can use the PreparedStatement object to execute SQL statements and queries, which produce ResultSet objects (the result of executing SQL statements and queries). java.sql.CallableStatement: The Connection object creates CallableStatement (statements used to execute stored procedures) objects. You can use the PreparedStatement object to execute SQL statements and queries, which produce ResultSet objects (the result of executing SQL statements and queries). java.sql.ResultSet: The result of a SQL query is returned via a ResultSet object (a table of data representing a database result set, which is usually generated by executing a statement that queries the database).

if(crs.isBeforeFirst()) { System.out.println("We have reached the start"); } crs.first(); if(crs.isFirst()) { System.out.println("We have moved to first"); } System.out.println("crs row: " + crs.getRow()); if(!crs.isBeforeFirst()) { System.out.println("We aren't before the first row."); } crs.last(); if(crs.isLast()) { System.out.println("...and now we have moved to the last"); } System.out.println("crs row: " + crs.getRow()); if(!crs.isAfterLast()) { System.out.println("we aren't after the last."); } } // end try catch (SQLException e) { e.printStackTrace(); System.err.println("SQLException: " + e.getMessage()); } } // end constructor

Step 2: Using MapListHandler (Example 2)

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