Minor fixes...
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@ -35,6 +35,10 @@ public class Driver implements java.sql.Driver
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// my early jdbc work did - and that was based on other examples).
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// Placing it here, means that the driver is registered once only.
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java.sql.DriverManager.registerDriver(new Driver());
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// New in 7.1 - register ourselves with the JVM - JDK1.3+ only
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@JDK1.3ONLY@org.postgresql.core.ConnectionHook.init();
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} catch (SQLException e) {
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e.printStackTrace();
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}
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95
src/interfaces/jdbc/org/postgresql/core/ConnectionHook.java
Normal file
95
src/interfaces/jdbc/org/postgresql/core/ConnectionHook.java
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@ -0,0 +1,95 @@
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package org.postgresql.core;
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import java.sql.SQLException;
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import java.util.ArrayList;
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import java.util.Iterator;
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import org.postgresql.Connection;
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/**
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* ConnectionHook keeps track of all open Connections. It's used only in
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* Java2 (JDK1.3+) VM's, and it's purpose is to close all connections cleanly
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* when the VM terminates.
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*
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* Important: This only works for JDK1.3 or later as it uses methods new to
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* that JDK.
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*
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* This is a singleton object ;-)
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*
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* How it works: This is an initiated but un-started Thread. When it's created,
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* it registers it'self with the Runtime.addShutdownHook() method.
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*
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* When a Connection is made, two static methods in org.postgresql.Driver are
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* called. For pre JDK1.3 these are noops, but for 1.3+ ANT adds calls to
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* methods in this class, which add/remove it from an ArrayList.
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*
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* Now when the VM terminates it starts this thread, which then Itterates
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* through the ArrayList and closes each Connection.
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*
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* Obviously this doesn't trap things like Runtime.halt() or SIGKILL etc, but
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* this captures 99% of all other forms of VM termination.
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*
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*/
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public class ConnectionHook implements Runnable
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{
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/**
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* This ensures that the hook is created and the system is notified of it.
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*
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* Important: We have to use an instance, as we have to pass a reference to
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* the VM.
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*/
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private static final ConnectionHook SINGLETON = new ConnectionHook();
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/**
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* The currently open connections
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*/
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private ArrayList cons = new ArrayList();
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/**
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* Constructor. This is private because we are a singleton. Here we set
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* our selves up, and then register with the VM.
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*/
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private ConnectionHook() {
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super();
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Runtime.getRuntime().addShutdownHook(new Thread(this));
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}
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/**
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* Called by Driver, this simply forces us to be created.
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*/
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public static final void init() {
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}
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/**
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* This is used by org.postgresql.Connection to register itself. Because it's
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* called internally, we don't bother with checking to see if it's already
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* present (performance boost).
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*/
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public static final void open(Connection con) {
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SINGLETON.cons.add(con);
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}
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/**
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* This is used by org.postgresql.Connection to remove itself.
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*/
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public static final void close(Connection con) {
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SINGLETON.cons.remove(con);
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}
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/**
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* This is called by the VM when it terminates. It itterates through the list
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* of connections and implicitly closes them.
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*/
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public void run() {
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Iterator i = cons.iterator();
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while(i.hasNext()) {
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Connection c = (Connection) i.next();
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try {
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c.close();
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} catch(SQLException e) {
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// Ignore as at this point we are dying anyhow ;-)
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}
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}
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}
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}
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@ -214,6 +214,7 @@ public int getInt(int parameterIndex) throws SQLException {
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* desired number of digits to the right of the decimal point
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* @return the parameter value; if the value is SQL NULL, the result is null
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* @exception SQLException if a database-access error occurs.
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* @deprecated in Java2.0
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*/
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public BigDecimal getBigDecimal(int parameterIndex, int scale)
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throws SQLException {
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