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Java 6 RowSet ʹÓÃÍêÈ«ÆÊÎö(2)

Java 6 RowSet ʹÓÃÍêÈ«ÆÊÎö(2)
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ÓÉÓÚ CachedRowSet Êǽ«Êý¾ÝÁÙʱ´æ´¢ÔÚÄÚ´æÖУ¬Òò´Ë¶ÔÓÚÐí¶à SQL ²éѯ£¬»á·µ»Ø´óÁ¿µÄÊý¾Ý¡£Èç¹û½«Õû¸ö½á¹û¼¯È«²¿´æ´¢ÔÚÄÚ´æÖлáÕ¼ÓôóÁ¿µÄÄڴ棬ÓÐʱÉõÖÁÊDz»¿ÉÐеġ£¶Ô´Ë CachedRowSet ÌṩÁË·ÖÅú´Ó ResultSet ÖлñÈ¡Êý¾ÝµÄ·½Ê½£¬Õâ¾ÍÊÇ·ÖÒ³¡£Ó¦ÓóÌÐò¿ÉÒÔ¼òµ¥µÄͨ¹ý setPageSize ÉèÖÃÒ»Ò³ÖÐÊý¾ÝµÄ×î´óÐÐÊý¡£Ò²¾ÍÊÇ˵£¬Èç¹ûÒ³´óСÉèÖÃΪ 5£¬Ò»´ÎÖ»»á´ÓÊý¾ÝÔ´»ñÈ¡ 5 ÌõÊý¾Ý¡£ÏÂÃæµÄ´úÂëʾ·¶ÁËÈçºÎ½øÐмòµ¥·ÖÒ³²Ù×÷¡££¨·ÖÒ³²¿·Ö´úÂëĬÈÏ ORDERS ±íÖÐÓÐ 10 ÌõÊý¾Ý£©
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ResultSet rs = stmt.executeQuery(DBCreator.SQL_SELECT_ORDERS);    
  
CachedRowSet cachedRS = new CachedRowSetImpl(); // ÉèÖÃÒ³´óС    
  
cachedRS.setPageSize(4);    
  
cachedRS.populate(rs, 1);    
  
while (cachedRS.nextPage()) { printRowSet(cachedRS); }    
  
while (cachedRS.previousPage()) { printRowSet(cachedRS); }    
ResultSet rs = stmt.executeQuery(DBCreator.SQL_SELECT_ORDERS);
CachedRowSet cachedRS = new CachedRowSetImpl(); // ÉèÖÃÒ³´óС
cachedRS.setPageSize(4);
cachedRS.populate(rs, 1);
while (cachedRS.nextPage()) { printRowSet(cachedRS); }
while (cachedRS.previousPage()) { printRowSet(cachedRS); }
¿ÉÒÔ¿´µ½Ö»ÐèÒªÔÚ populate ֮ǰʹÓà setPageSize ÉèÖÃÒ³µÄ´óС£¬¾Í¿ÉÒÔÇáËÉʵÏÖ·ÖÒ³ÁË¡£Ã¿´Îµ÷Óà nextPage »ò previousPage ½øÐз­Ò³ºó£¬ÐÐÓα궼»á±»×Ô¶¯Òƶ¯µ½µ±Ç°Ò³µÚÒ»ÐеÄÇ°Ãæ£¬²¢ÇÒÖ»ÄÜÔÚµ±Ç°Ò³ÄÚÒÆ¶¯¡£ÕâÑùÎÒÃǶÔÿһҳ¶¼¿ÉÒÔÏñеÄÊý¾Ý¼¯Ò»Ñù½øÐбéÀú£¬·Ç³£·½±ã¡£ÕâÀïÐèҪעÒâµÄÊÇ£º
ÓÃÀ´Ìî³ä CachedRowSet µÄ ResultSet ±ØÐëÊǿɹö¶¯µÄ£¨Scrollable£©¡£
populate ±ØÐëʹÓÃÓÐÁ½¸ö²ÎÊýµÄ°æ±¾£¬·ñÔòÎÞ·¨½øÐзÖÒ³¡£¶ÁÕß¿ÉÒÔ½« cachedRS.populate(rs, 1); »»³É cachedRS.populate(rs); ¿´¿´»áÓÐÔõÑùµÄÇé¿ö·¢Éú¡£
ResultSet rs ±ØÐëÔÚ±éÀúÍê±Ïºó²ÅÄܹرգ¬·ñÔò·­Ò³±éÀúʱ»áÅ× SQLException¡£
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̸µ½JavaÓïÑÔ»ù´¡Ñ§Ï°µÄÊé¼®£¬´ó¼Ò¿Ï¶¨»áÍÆ¼öBruce EckelµÄ¡¶ThinkinginJava¡·¡£ËüÊÇÒ»±¾Ð´µÄÏ൱Éî¿ÌµÄ¼¼ÊõÊé¼®£¬JavaÓïÑÔ»ù´¡²¿·Ö»ù±¾Ã»ÓÐÆäËüÈκÎÒ»±¾Êé¿ÉÒÔ³¬Ô½Ëü¡£¸ÃÊéµÄ×÷ÕßBruceEckelÔÚÍøÂçÉϱ»³ÆÎªÌì²ÅµÄͶ»úÕߣ¬×÷Õߵġ¶Thinking in C++¡·ÔÚ1995ÄêÔø»ñSoftwareDevelopmentJoltAward×î¼ÑÊé¼®´ó½±£¬¡ ......

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C++µ÷ÓÃJAVAÖ÷ÒªÓõ½ÁËSUN¹«Ë¾µÄJNI¼¼Êõ£¬ JNIÊÇJava Native InterfaceµÄ Ëõд¡£´ÓJava 1.1¿ªÊ¼£¬Java Native Interface (JNI)±ê×¼³ÉΪjavaƽ̨µÄÒ»²¿·Ö£¬ËüÔÊÐíJava´úÂëºÍÆäËûÓïÑÔдµÄ´úÂë½øÐн»»¥¡£Ïà¹Ø×ÊÁϼûhttp://java.sun.com/j2se/1.5.0/docs/guide/jni/spec/jniTOC.htm ......

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Java: Simple HTTPUrlConnection example


Java:
Simple HTTPUrlConnection example
 
package
ChinaCache;
 
import
java.io.BufferedReader;
import
java.io.IOException;
import
java.io.InputStreamReader;
import
java.io.OutputStreamWriter;
import
java.net.HttpURLConnection;
 
import
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