Admin: 1 версия

2010-06-01T05:05:58Z

1 версия

в 17:44, 31 мая 2010

2010-05-31T17:44:27Z

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== Look up DataSource from InitialContext ==



<source lang="java">
import java.sql.Connection;
import javax.naming.InitialContext;
import javax.sql.DataSource;
public class Main {
public static void main(String[] argv) throws Exception {
InitialContext init = new InitialContext();
DataSource source = (DataSource) init.lookup("dsn");
Connection connection = source.getConnection();
System.out.println("Connect to " + connection.getCatalog() + " a success!");
}
}</source>



== Use JNDI to get database connection or data source ==



<source lang="java">
import java.io.IOException;
import java.io.PrintWriter;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;
import javax.naming.InitialContext;
import javax.naming.NamingException;
import javax.servlet.Servlet;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.sql.DataSource;
public class Main extends HttpServlet implements Servlet {
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
DateFormat dateFormat = new SimpleDateFormat("dd/MM/yyyy");
response.setContentType("text/html");
PrintWriter writer = response.getWriter();
Connection connection = getConnection();
if (connection != null) {
String sql = "SELECT SYSDATE FROM DUAL";
try{
PreparedStatement statement = connection.prepareStatement(sql);
ResultSet rs = statement.executeQuery();
while (rs.next()) {
Date date = rs.getDate("SYSDATE");
writer.println("The current date is " + dateFormat.format(date));
}
connection.close();
}catch(Exception e){
System.out.println(e);
}
}
}
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
}
private Connection getConnection() {
Connection connection = null;
try {
InitialContext context = new InitialContext();
DataSource dataSource = (DataSource) context.lookup("jdbc/DataSource");
connection = dataSource.getConnection();
} catch (NamingException e) {
e.printStackTrace();
} catch (SQLException e) {
e.printStackTrace();
}
return connection;
}
}</source>

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Admin: 1 версия

в 17:44, 31 мая 2010