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1.Êý¾Ý¿âµÄurl  jdbc:mysql://loaclhost:3306/test
 jdbc:±íʾÁ¬½ÓÊý¾Ý¿âʹÓõÄÊÇjdbcЭÒé
 mysql£º±íʾÁ¬½ÓÊý¾Ý¿âµÄ×ÓЭÒ飬²»Í¬µÄÊý¾Ý¿âʹÓõÄЭÒé²» Ò»Ñù
 localhost£ºÊý¾Ý¿â·þÎñÆ÷ËùÔÚµÄipµØÖ·
 3306 £ºÊ¹ÓõĶ˿ںÅ
 test£ºÁ¬½ÓµÄÊý¾Ý¿â
2.Class.forname("com.mysql.jdbc.Driver")
  Ëü¼ÓÔØÁË×Ö½ÚÂ룬µ«²»µ÷ÓÃcom.mysql.jdbc.DriverÀàµÄ¹¹Ôì·½ ·¨£¬
   Ëü×¢²áÁËÇý¶¯£¬µ÷ÓõÄÊÇcom.mysql.jdbc.DriverµÄ¾²Ì¬´úÂë ¿é
3.Á¬½ÓÊý¾Ý¿âÓÐÒ쳣ʱ£¬ÓÃtry-catch´¦Àí
4.´´½¨statement¶ÔÏ󣬿ÉÒÔ¿´³ÉÒ»¸öÈÝÆ÷£¬ÓÃÀ´ÔËËÍsqlÓï¾ä£¬
 stmt=conn.createStatemrnt();
5.×éÖ¯sqlÓï¾ä£¬
 String sql="insert into test(id,name)
   values(null,'ccc')"; null´ú±í×ÔÔö
 Ö´ÐÐsqlÓï¾ä£ºint k=symt.executeUpdate(sql);
 executeUpdate ¿ÉÒÔÖ´Ðиø¶¨µÄsqlÓï¾ä£¬
 Ö´ÐÐDML£¨insert update delete£©·µ»ØÖµÊÇÓ°ÏìµÄÐÐÊý£¬
 Ö´ÐÐDDL£¨create alter drop£©Óï¾ä ·µ»ØÖµÊÇ0
6.¹Ø±ÕÁ¬½Ó£ºÏȹØstatement£¬ÔÚ¹Øconn£¬
  if stmt!=null stmt.close();
  if conn!=null conn.close();
7.Ö´ÐÐÊý¾Ý¿âµÄ²éѯÓï¾ä£»
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 String sql="select id ,name from test";
 Resultset rs= stmt.executeQuery(sql);//·µ»ØֵΪResultset
 Resultset ÊÇÒ»¸ö½á¹û¼¯£¬¸ú±íµÄ½á¹¹ÀàËÆ£¬
8.´ÓResultset ÀïÃæÈ¡Êý¾Ýʱ£¬¹â±ê´¦ÓÚµÚÒ»ÐÐÊý¾ÝµÄÇ°Ã棬
 rs.next();//½«½á¹û¼¯µÄ¹â±êÏÂÒÆÒ»ÐУ¬
  rs.getXxxxx(columneLable) ²ÎÊýÊÇÁеÄË÷ÒýÖµ,¸ÃË÷ÒýÖµ´Ó1  ¿ªÊ¼ 2 3...
 int id=rs.getInt(1);//È¡µÚÒ»ÁÐÊý¾Ý,
 String name=rs.getString(2);//È¡µÚ¶þÁÐÊý¾Ý
9.ʹÓÃwhile±éÀú   //²»ÓÃÅжÏrs£¡=null £¬ÒòΪrs ÓÀÔ¶²»Îª¿Õ
  while(rs.next){
   int id=rs.getInt(1);
   String name=rs.getString(2);
   system.out.print(id+" "+name);
  }
10.¹Ø±ÕµÄ˳Ðò£ºrs stmt conn
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 rs.next();//½«½á¹û¼¯µÄ¹â±êÏÂÒÆÒ»ÐУ¬
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 int id=rs.getInt("id");//È¡ÁÐΪ"id"Êý¾Ý
 String name=rs.getString("name");//È¡ÁÐ


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