mysql查询大量数据异常

Question

The driver was unable to create a connection due to an inability to establish the client portion of a socket.

This is usually caused by a limit on the number of sockets imposed by the operating system. This limit is usually configurable.

For Unix-based platforms, see the manual page for the 'ulimit' command. Kernel or system reconfiguration may also be required.
数据库没问题，每次查询完执行：
if(rs!=null){
try {
rs.close();
} catch (Exception e) {
// TODO: handle exception
}
}
//关闭资源[先开后闭];
if(ps!=null){
try {
ps.close();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
ps=null;//使用垃圾回收.
}
if(ct!=null){
try {
ct.close();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
ct=null;
}
在一个方法里有个循环要反复去查询数据库，每次都是调用工具类去查询，也就是每次都执行了上面的关闭。可当查询到4000次左右时就抛出了上面的异常。请帮忙看看，万分感谢！

Answer 1

这个问题很简单，你加个连接缓冲池就OK了。因为你写了连接关闭，但是数据库连接没有立马关闭，需要等待一小段时间才会关闭。