在Java中设置Oracle 10g数据库连接超时

Question

I tried to set a connection timeout with the following code:

public class ConnectionTimeout {  
  public static void main(String[] args) throws Exception {

    String entry = "jdbc:oracle:thin:@xxx:1521:xxx";
    Connection con=null;

    Class.forName("oracle.jdbc.driver.OracleDriver");

    DriverManager.setLoginTimeout(1);        
    con=DriverManager.getConnection(entry,"username","password");    

    Statement s=con.createStatement();    
    s.execute("select 1 from dual");    
    s.close();

    con.close();
  }
}

The instance xxx is not existing. But I get the following exception:

Exception in thread "main" java.sql.SQLException: E/A-Exception: Socket is not connected
    at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:112)
    at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:146)
    at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:255)
    at oracle.jdbc.driver.T4CConnection.logon(T4CConnection.java:387)
    at oracle.jdbc.driver.PhysicalConnection.<init>(PhysicalConnection.java:439)
    at oracle.jdbc.driver.T4CConnection.<init>(T4CConnection.java:165)
    at oracle.jdbc.driver.T4CDriverExtension.getConnection(T4CDriverExtension.java:35)
    at oracle.jdbc.driver.OracleDriver.connect(OracleDriver.java:801)
    at java.sql.DriverManager.getConnection(Unknown Source)
    at java.sql.DriverManager.getConnection(Unknown Source)
    at my.package.connection.timeout.ConnectionTimeout.main(ConnectionTimeout.java:22)

How I can implement a timeout to an not existing or available Oracle database instance?

Edit: If I set the DriverManager.setLoginTimeout(30); to 30 second, the exception happens so fast as before!

Answer 1

Your DriverManager.setLoginTimeout(1); sets the maximum time in seconds for the driver to wait while connecting to the database. In your case, it's set to 1.

To have no limit, set setLoginTimeout(0) where 0 means no limit.

I hope this helps.

---

Update if your instance xxx doesn't exists, how would you expect your Oracle Driver to connect to the database? It won't make any difference how long you set your loginTimeout there's not "host" to connect to.

Answer 2

Because, in Java doc, it shows: timeout in seconds, but in the implementation of JDBC Oracle, it is milliseconds.

You can try using a measure of milliseconds.