增强监控

git-svn-id: http://code.alibabatech.com/svn/druid/trunk@553 b9813039-fb51-4c41-a8b9-e21c2acb5095

src/main/java/com/alibaba/druid/pool/ConnectionHolder.java

@@ -18,6 +18,7 @@ package com.alibaba.druid.pool;
 import java.sql.Connection;
 import java.sql.Statement;
 import java.util.ArrayList;
+import java.util.Date;
 import java.util.List;
 import java.util.concurrent.CopyOnWriteArrayList;
 
@@ -129,4 +130,26 @@ public final class ConnectionHolder {
         }
         statementTrace.clear();
     }
+    
+    public String toString() {
+        StringBuilder buf = new StringBuilder();
+
+        buf.append("{ID:");
+        buf.append(System.identityHashCode(conn));
+        buf.append(", ConnectTime:\"");
+        buf.append(JdbcUtils.toString(new Date(this.connecttimeMillis)));
+        
+        buf.append("\", UseCount:");
+        buf.append(useCount);
+        
+        if (lastActiveTimeMillis > 0) {
+            buf.append(", LastActiveTime:\"");
+            buf.append(JdbcUtils.toString(new Date(this.lastActiveTimeMillis)));
+            buf.append("\"");
+        }
+        
+        buf.append("}");
+        
+        return buf.toString();
+    }
 }