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try { System.out.println("-- TestConnectToMoreThanOneDatabase begin --"); // get connection to an Oracle database oracleConn = getOracleConnection(); // get connection to a MySQL database mysqlConn = getMySqlConnection(); System.out.println("oracleConn="+oracleConn); System.out.println("mysqlConn="+mysqlConn); // now, you may use oracleConn to access an Oracle database // and use mysqlConn to access a MySQL database // // use oracleConn and mysqlConn // System.out.println("-- TestConnectToMoreThanOneDatabase end --"); } catch(Exception e){ // handle the exception e.printStackTrace(); System.exit(1); } finally { // release database resources DatabaseUtil.close(oracleConn); DatabaseUtil.close(mysqlConn); } } }

UNSIGNED_ATTRIBUTE FIXED_PREC_SCALE AUTO_INCREMENT LOCAL_TYPE_NAME MINIMUM_SCALE MAXIMUM_SCALE SQL_DATA_TYPE SQL_DATETIME_SUB NUM_PREC_RADIX

To test more than one database, use this code: $ javac TestConnectToMoreThanOneDatabase.java $ java TestConnectToMoreThanOneDatabase -- TestConnectToMoreThanOneDatabase begin -oracleConn=oracle.jdbc.driver.OracleConnection@16f0472 mysqlConn=com.mysql.jdbc.Connection@18d107f -- TestConnectToMoreThanOneDatabase end --

We can also import only the desired HTML elements from the imported file. So in the following jQuery code, we import only the list items (and no paragraph elements) from the namesinfo.htm file : $(document).ready(function() { $('.list').click(function () { $('#message').load('namesinfo.htm li'); return false; }); });

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Among java.sql objects, the JDBC Connection object (java.sql.Connection) is the most important object in the java.sql package. When you get a Connection object, with some simple tests you can figure it out to see if the connection is a valid connection. The following scenarios show how a connection can go bad: If you hold a Connection object for a while and then the database server goes down (for any reason), then that connection is no longer a valid connection. If you hold a Connection object for a while and then the connection times out (closes itself), then that connection is no longer a valid connection.

import java.io.PrintWriter; import java.io.IOException; import java.sql.*; import javax.servlet.*; import javax.servlet.http.*;

Before we begin understanding the above jQuery code, let s first see what the load() method does, and how it is used in above code. Essentially, this function adds the specified file from the server and returns its HTML contents, like this: Syntax: .load(url, parameters, callback function) url is the string defining the location of the server side script file parameters contains the data that we want to be passed to the server side script file for some processing callback function is the one that is executed when the request succeeds

If you hold a Connection object for a while and then the network connection dies, then that connection is no longer a valid connection. There might be other situations where you might think you are holding a valid connection but the reality is that the connection cannot do much (which is an obsolete connection). Now, the real question is this: once you have a connection, how do you determine if that connection is a valid/useful connection and you can get/set data from/to a database In the following recipes, I have developed a method that accepts a connection and its vendor and then returns true if the connection is a valid connection; otherwise, it returns false. If a connection s validation fails, it must be destroyed, and a new Connection object must be created and returned.

The following code is quite lengthy, but it shows a full creation-and-test sequence so that you can see the validation technique at work. I ve put plenty of comments in the code so you can easily see what it s doing. I provide some sample output immediately after this listing. import java.util.*; import java.io.*; import java.sql.*; import jcb.db.*; import jcb.meta.*; public class TestValidityOfConnection { /** * Create an Oracle connection... */ public static Connection getOracleConnection() throws Exception { String driver = "oracle.jdbc.driver.OracleDriver"; String url = "jdbc:oracle:thin:@localhost:1521:scorpian"; String username = "octopus"; String password = "octopus"; Class.forName(driver); // load Oracle driver return DriverManager.getConnection(url, username, password); } /** * Create a MySQL connection... */ public static Connection getMySqlConnection() throws Exception { String driver = "org.gjt.mm.mysql.Driver"; String url = "jdbc:mysql://localhost/tiger"; String username = "root"; String password = "root"; Class.forName(driver); // load MySQL driver return DriverManager.getConnection(url, username, password); } /** * Test validity of a connection * @param conn a JDBC Connection object * @param vendor a database vendor: { "oracle", "mysql", ...} * @return true if a given Connection object is a valid one; * otherwise return false.

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