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The solution to this problem is the same as the previous solution you will merely replace the getConnection() method with the following (which is specific to the MySQL database): public static Connection getConnection() throws SQLException { String driver = " com.mysql.jdbc.Driver "; // load the MySQL JDBC driver Class.forName(driver); // define database connection parameters String dbURL = " jdbc:mysql://localhost/tiger "; String dbUser = "root"; String dbPassword = "root"; // get a database Connection object: A connection (session) // with a specific database. SQL statements are executed, and // results are returned within the context of a connection. return DriverManager.getConnection(dbURL, dbUser, dbPassword); } To run this simple program, use this code: $ javac SimpleProgramToAccessMySQLDatabase.java $ java SimpleProgramToAccessMySQLDatabase name=mono trick=rollover ========== name=mono trick=jump ========== $ mysql Welcome to the MySQL monitor. Commands end with ; or \g. Your MySQL connection id is 4 to server version: 4.0.15-nt mysql> show databases; +----------+ | Database | +----------+ | empdb | | javatest | | mysql | | test | | tiger | +----------+ 5 rows in set (0.02 sec) mysql> use tiger; Database changed mysql> desc cats_tricks; +-------+-------------+------+-----+---------+-------+ | Field | Type | Null | Key | Default | Extra | +-------+-------------+------+-----+---------+-------+ | name | varchar(30) | YES | | NULL | | | trick | varchar(30) | YES | | NULL | | +-------+-------------+------+-----+---------+-------+ 2 rows in set (0.00 sec)

You have an array that contains some names and you want to filter it to see only the desired names. For example, you may want to see only those names with a length of more than four characters.

mysql> select * from cats_tricks; +------+----------+ | name | trick | +------+----------+ | mono | rollover | | mono | jump | +------+----------+ 2 rows in set (0.00 sec)

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/** * Get the Oracle table names for a given connection object. * If you use getTableNames() for an Oracle database, you * will get lots of auxiliary tables, which belong to the user, * but the user is not interested in seeing them. * * @param conn the Connection object * @return the list of table names as a List. * @exception Failed to get the table names from the database. */ public static List<String> getOracleTableNames(Connection conn) throws Exception { Statement stmt = null; ResultSet rs = null; try { stmt = conn.createStatement(); rs = stmt.executeQuery(ORACLE_TABLES); if (rs == null) { return null; } List<String> list = new ArrayList<String>(); while (rs.next()) { String tableName = DatabaseUtil.getTrimmedString(rs, 1); System.out.println("tableName="+tableName); if (tableName != null) { list.add(tableName); } } return list; } finally { DatabaseUtil.close(rs); DatabaseUtil.close(stmt); } }

Let s consider an HTML file that has two heading elements and each is followed by a paragraph element. The first paragraph element is assigned a class name allmem and the other paragraph is assigned the class name selected. The HTML file may appear as shown here:

To enable the JDBC APIs, you must set your CLASSPATH environmental variable to indicate to the Java virtual machine and Java-based applications where to find the class libraries, including userdefined class libraries. To view the content of a CLASSPATH on Windows, use the following code: $ set CLASSPATH CLASSPATH=.;c:\jdk142\lib\dt.jar;c:\jdk142\lib\tools.jar; c:\mp\book\src;c:\j\httpclient.jar To view the content of a CLASSPATH on Unix/Linux, use the following code: $ echo $CLASSPATH .:/usr/java/j2sdk1.4.2_03/lib/dt.jar: /usr/java/j2sdk1.4.2_03/lib/tools.jar: /usr/java/j2sdk1.4.2_03/lib/htmlconverter.jar For example, if you want to add the Oracle driver to your CLASSPATH, then you must do the following, before running your JDBC applications. You can find Oracle s implementation of the java.sql package and other supporting classes in the ojdbc14.jar file.

C:\oracle\product\10.1.0\Db_1\jdbc\lib\ojdbc14.jar is an Oracle JDBC driver for the Oracle 10g database in a Windows environment, and /export/oracle/product/10.1.0/Db_1/jdbc/lib/ojdbc14.jar is an Oracle JDBC driver for the Oracle 10g database in a Linux environment.

/** * Get the table names for a given connection object. * @param conn the Connection object * @return the list of table names as a List. * @exception Failed to get the table names from the database. */

<body> <h3> Members of my Group are </h3> <p class="allmem"></p> <h3> Names with more than 4 characters in length are </h3> <p class="selected"></p> </body> We will be using the first paragraph (class allmem) to display the whole array; that is, all the names in the list. We ll use the second paragraph (class selected) for displaying the filtered names.

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