trysqlwarning.java

此程序都是企业级 的数据库开发程序 全面揭示了JAVA对数据库的操作

import java.sql.*;

public class TrySQLWarning
{
	  public static void main(String[] args)
	  {
			String url = "jdbc:cloudscape:Wrox4370.db";
			String driver = "COM.cloudscape.core.JDBCDriver";

			String username = "guest";
			String password = "guest";

			String theStatement =
			   "SELECT recordingid, recordingtitle, listprice FROM recordings";


			try
			{
				Class.forName(driver);
				Connection connection = DriverManager.getConnection(url, username, password);
				Statement queryRecordings = connection.createStatement();

				ResultSet theResults =  queryRecordings.executeQuery(theStatement);
				while(theResults.next())
				{
					int id, price;
					String title;

					id = theResults.getInt("recordingid");
					checkForWarning(theResults.getWarnings());

					title = theResults.getString("recordingtitle");
					checkForWarning(theResults.getWarnings());

					price = theResults.getInt("listprice");
					checkForWarning(theResults.getWarnings());

					System.out.println(id + ", " + title + ", " + price);
				}

			    queryRecordings.close();
		    }
			catch (ClassNotFoundException cnfe)
	    	{
			    System.out.println(cnfe);
		    }
			catch (SQLException sqle)
	    	{
				do // loop through each exception
				{
					// do something with each exception
					System.err.println("Exception occurred:\nMessage: " + sqle.getMessage());
					System.err.println("SQL state: " + sqle.getSQLState());
					System.err.println("Vendor code: " + sqle.getErrorCode() +
								 "\n----------------");
				} while((sqle = sqle.getNextException()) != null);
		    }
		}
	static boolean checkForWarning(SQLWarning w)
	{
		if(w == null)
			return false;
		do
		{
			System.err.println("Warning:\nMessage: " + w.getMessage());
			System.err.println("SQL state: " + w.getSQLState());
			System.err.println("Vendor code: " + w.getErrorCode() +
							   "\n----------------");
		}while((w = w.getNextWarning())!=null);
		return true;
	}
}