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- com.mysql.jdbc.CommunicationsException: Communications link failure due to underlying exception:
- ** BEGIN NESTED EXCEPTION **
- java.net.ConnectException
- MESSAGE: Connection refused
- STACKTRACE:
- java.net.ConnectException: Connection refused
- at java.net.PlainSocketImpl.socketConnect(Native Method)
- at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
- at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
- at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
- at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
- at java.net.Socket.connect(Socket.java:589)
- at java.net.Socket.connect(Socket.java:538)
- at java.net.Socket.<init>(Socket.java:434)
- at java.net.Socket.<init>(Socket.java:244)
- at com.mysql.jdbc.StandardSocketFactory.connect(StandardSocketFactory.java:256)
- at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:271)
- at com.mysql.jdbc.Connection.createNewIO(Connection.java:2771)
- at com.mysql.jdbc.Connection.<init>(Connection.java:1555)
- at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:285)
- at java.sql.DriverManager.getConnection(DriverManager.java:664)
- at java.sql.DriverManager.getConnection(DriverManager.java:247)
- at JDBC.main(JDBC.java:22)
- at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
- at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
- at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
- at java.lang.reflect.Method.invoke(Method.java:498)
- at com.intellij.rt.execution.application.AppMain.main(AppMain.java:147)
- ** END NESTED EXCEPTION **
- Last packet sent to the server was 0 ms ago.
- at com.mysql.jdbc.Connection.createNewIO(Connection.java:2847)
- at com.mysql.jdbc.Connection.<init>(Connection.java:1555)
- at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:285)
- at java.sql.DriverManager.getConnection(DriverManager.java:664)
- at java.sql.DriverManager.getConnection(DriverManager.java:247)
- at JDBC.main(JDBC.java:22)
- at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
- at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
- at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
- at java.lang.reflect.Method.invoke(Method.java:498)
- at com.intellij.rt.execution.application.AppMain.main(AppMain.java:147)
- //STEP 1. Import required packages
- import java.sql.*;
- public class JDBC {
- // JDBC driver name and database URL
- static final String JDBC_DRIVER = "com.mysql.jdbc.Driver";
- static final String DB_URL = "jdbc:mysql://localhost/";
- // Database credentials
- static final String USER = "username";
- static final String PASS = "password";
- public static void main(String[] args) {
- Connection conn = null;
- Statement stmt = null;
- try{
- //STEP 2: Register JDBC driver
- Class.forName("com.mysql.jdbc.Driver");
- //STEP 3: Open a connection
- System.out.println("Connecting to database...");
- conn = DriverManager.getConnection(DB_URL, USER, PASS);
- //STEP 4: Execute a query
- System.out.println("Creating database...");
- stmt = conn.createStatement();
- String sql = "CREATE DATABASE PREDICTOR";
- stmt.executeUpdate(sql);
- System.out.println("Database created successfully...");
- }catch(SQLException se){
- //Handle errors for JDBC
- se.printStackTrace();
- }catch(Exception e){
- //Handle errors for Class.forName
- e.printStackTrace();
- }finally{
- //finally block used to close resources
- try{
- if(stmt!=null)
- stmt.close();
- }catch(SQLException se2){
- }// nothing we can do
- try{
- if(conn!=null)
- conn.close();
- }catch(SQLException se){
- se.printStackTrace();
- }//end finally try
- }//end try
- System.out.println("Goodbye!");
- }//end main
- }
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