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import java.io.*;
import java.sql.*;
import java.util.*;
import java.util.Date;
 /*
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  * DBConnectionManagerÀàµÄ½¨¹¹º¯ÊýÊÇ˽Óеģ¬ÕâÊÇΪÁ˱ÜÃâÆäËü¶ÔÏó´´½¨¸ÃÀàµÄʵÀý.
  * DBConnectionManagerÀàµÄ¿Í»§³ÌÐò¿ÉÒÔµ÷ÓÃgetInstance()·½·¨»ñµÃ¶Ô¸ÃÀàΨһʵÀýµÄÒýÓá£
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  * instanceÖС£Ã¿´Îµ÷ÓÃgetInstance()¶¼Ôö¼ÓÒ»¸öDBConnectionManagerµÄ¿Í»§³ÌÐò¼ÆÊý¡£
  * ¼´£¬¸Ã¼ÆÊý´ú±íÒýÓÃDBConnectionManagerΨһʵÀýµÄ¿Í»§³ÌÐò×ÜÊý£¬Ëü½«±»ÓÃÓÚ¿ØÖÆÁ¬½Ó³ØµÄ
  * ¹Ø±Õ²Ù×÷¡£ ¸ÃÀàʵÀýµÄ³õʼ»¯¹¤×÷˽Óз½·¨init()Íê³É¡£ÆäÖÐ getResourceAsStream()·½·¨
  * ÓÃÓÚ¶¨Î»²¢´ò¿ªÍⲿÎļþ¡£ÍⲿÎļþµÄ¶¨Î»·½·¨ÒÀÀµÓÚÀà×°ÔØÆ÷µÄʵÏÖ¡£±ê×¼µÄ±¾µØÀà×°ÔØÆ÷²éÕÒ²Ù
  * ×÷×ÜÊÇ¿ªÊ¼ÓÚÀàÎļþËùÔÚ·¾¶£¬Ò²Äܹ»ËÑË÷CLASSPATHÖÐÉùÃ÷µÄ·¾¶¡£db.propertiesÊÇÒ»¸öÊôÐÔ
  * Îļþ£¬Ëü°üº¬¶¨ÒåÁ¬½Ó³ØµÄ¼ü-Öµ¶Ô¡£¿É¹©¶¨ÒåµÄ¹«ÓÃÊôÐÔÈçÏ£º 
  *   drivers ÒÔ¿Õ¸ñ·Ö¸ôµÄJDBCÇý¶¯³ÌÐòÀàÁбí\\ 
  *   logfile ÈÕÖ¾ÎļþµÄ¾ø¶Ô·¾¶ 
  *  ÆäËüµÄÊôÐÔºÍÌØ¶¨Á¬½Ó³ØÏà¹Ø£¬ÆäÊôÐÔÃû×ÖǰӦ¼ÓÉÏÁ¬½Ó³ØÃû×Ö£º 
  *  < poolname>.url Êý¾Ý¿âµÄ JDBC URL 
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  *  drivers=com.microsoft.jdbc.sqlserver.SQLServerDriver
  *  logfile=D:\\log.txt
  *  access.maxconn=20
  *  access.url=jdbc:microsoft:sqlserver://localhost:1433;databasename=web
  *  access.user=sa
  *  access.passw


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