cache connection

chat2db-server/chat2db-spi/src/main/java/ai/chat2db/spi/sql/ConnectInfo.java

@@ -556,6 +556,7 @@ public class ConnectInfo {
         copy.setDriverConfig(this.getDriverConfig());
         copy.setSid(this.getSid());
         copy.setUrlWithOutDatabase(this.getUrlWithOutDatabase());
+        copy.setLastAccessTime(new Date());
         return copy;
     }
 

chat2db-server/chat2db-spi/src/main/java/ai/chat2db/spi/sql/ConnectionPool.java

@@ -120,6 +120,7 @@ public class ConnectionPool {
             synchronized (lock) {
                 int n = lock.decrementRefCount();
                 if (n == 0) {
+                    lock.setLastAccessTime(new Date());
                     lock.setConnection(connectInfo.getConnection());
                 } else {
                     connectInfo.close();