关于ConnectionManager中的代码public class ConnectionManager {
private static ConnectionProvider connectionProvider;
private static Object providerLock = new Object();
// True if connection profiling is turned on. Always false by default.
private static boolean profilingEnabled = false;
// True if the database support transactions.
protected static boolean supportsTransactions;
// True if the database requires large text fields to be streamed.
protected static boolean streamLargeText;
// True if the database supports the Statement.setMaxRows() method.
protected static boolean supportsMaxRows;
// True if the database supports the Statement.setFetchSize() method.
protected static boolean supportsFetchSize;
// True if the database supports correlated subqueries.
protected static boolean supportsSubqueries;
private static DatabaseType databaseType = DatabaseType.OTHER;
static {
// Add a shutdown hook to the VM if we're running JDK 1.3. When the
// thread is executed, it will call the destroy() method of the
// current connection provider. This is necessary for some connection
// providers -- especially those for in-VM Java databases.
Runtime runtime = Runtime.getRuntime();
Class c = runtime.getClass();
try {
Method m = c.getMethod("addShutdownHook", new Class[] { Thread.class } );
m.invoke(runtime, new Object[] { new ShutdownThread() });
}
catch (NoSuchMethodException nsme) {
// Ignore -- the user might not be running JDK 1.3.
}
catch (Exception e) {
e.printStackTrace();
}
}.............................
}
在这个连接池的wrap中,这个静态声明的作用是什末,我没有看懂得它的作用,
请大家指点,这个声明的不用被调用吗?*(菜菜。。