AJ-679: optimize error info when pool init connect faild; fix issue about DBConnection use highAvailabilitySites;

Author: chengyitian

src/com/xxdb/DBConnection.java

@@ -790,12 +790,14 @@ public boolean connect(String hostName, int port, String userId, String password
 
                 if (bt!=null) {
                     if (!loadBalance_) {
-                        BasicStringVector colHost = (BasicStringVector) bt.getColumn("host");
-                        BasicIntVector colPort = (BasicIntVector) bt.getColumn("port");
-                        for (int i = 0; i < colHost.rows(); i++) {
-                            Node curNode = new Node(colHost.getString(i), colPort.getInt(i));
-                            if (!(curNode.hostName.equals(hostName) && curNode.port == port))
-                                nodes_.add(curNode);
+                        if (highAvailabilitySites == null) {
+                            BasicStringVector colHost = (BasicStringVector) bt.getColumn("host");
+                            BasicIntVector colPort = (BasicIntVector) bt.getColumn("port");
+                            for (int i = 0; i < colHost.rows(); i++) {
+                                Node curNode = new Node(colHost.getString(i), colPort.getInt(i));
+                                if (!(curNode.hostName.equals(hostName) && curNode.port == port))
+                                    nodes_.add(curNode);
+                            }
                         }
                     } else {
                         // enable loadBalance

src/com/xxdb/ExclusiveDBConnectionPool.java

@@ -81,8 +81,15 @@ public ExclusiveDBConnectionPool(String host, int port, String uid, String pwd,
 			// not enable loadBalance
 			for (int i=0; i<count; ++i) {
 				DBConnection conn = new DBConnection(false, useSSL, compress, usePython);
-				if(!conn.connect(host, port, uid, pwd, initialScript, enableHighAvailability, highAvailabilitySites, false, loadBalance))
-					throw new RuntimeException("Can't connect to the specified host.");
+				try {
+					boolean isConnected = conn.connect(host, port, uid, pwd, initialScript, enableHighAvailability, highAvailabilitySites, false, loadBalance);
+					if (!isConnected) {
+						throw new RuntimeException("Can't connect to the specified host.");
+					}
+				} catch (Exception e) {
+					throw new RuntimeException("Can't connect to the specified host: ", e);
+				}
+
 				workers_.add(new AsyncWorker(conn));
 			}
 		} else {