I'm working on Java Database Connectivity through Eclipse IDE. I built a database through Ubuntu Terminal, and I need
to connect and work with it. However, when I tried
to run the following code, I don't get any error, but the following output is showed, anybody knows why I don't get the output from the code ?
//STEP 1. Import required packages
import java.sql.*;
public class FirstExample {
// JDBC driver name and database URL
static final String JDBC_DRIVER = "com.
mysql.jdbc.Driver";
static final String DB_URL = "jdbc:mysql://localhost/EMP";
// 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 statement...");
stmt = conn.createStatement();
String sql;
sql = "SELECT id, first, last, age FROM Employees";
ResultSet rs = stmt.executeQuery(sql);
//STEP 5: Extract data from result set
while(rs.next()){
//Retrieve by column name
int id = rs.getInt("id");
int age = rs.getInt("age");
String first = rs.getString("first");
String last = rs.getString("last");
//Display values
System.out.print("ID: " + id);
System.out.print(", Age: " + age);
System.out.print(", First: " + first);
System.out.println(", Last: " + last);
}
//STEP 6: Clean-up environment
rs.close();
stmt.close();
conn.close();
}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
}//end FirstExample
<ConnectionProperties>
<PropertyCategory name="Connection/Authentication">
<Property name="user" required="No" default="" sortOrder="-2147483647" since="all">
The user
to connect as
</Property>
<Property name="password" required="No" default="" sortOrder="-2147483646" since="all">
The password
to use when connecting
</Property>
<Property name="socketFactory" required="No" default="com.
mysql.jdbc.StandardSocketFactory" sortOrder="4" since="3.0.3">
The name of the class that the driver should use for creating socket connections
to the server. This class must implement the interface 'com.
mysql.jdbc.SocketFactory' and have public no-args constructor.
</Property>
<Property name="connectTimeout" required="No" default="0" sortOrder="9" since="3.0.1">
Timeout for socket connect (in milliseconds), with 0 being no timeout. Only works on JDK-1.4 or newer. Defaults
to '0'.
</Property>
...
