jdbc Óë mysqlÁ¬½Ó
JDBCÁ¬½ÓMySQL
JDBCÁ¬½ÓMySQL
¼ÓÔؼ°×¢²áJDBCÇý¶¯³ÌÐò
Class.forName("com.mysql.jdbc.Driver");
Class.forName("com.mysql.jdbc.Driver").newInstance();
JDBC URL ¶¨ÒåÇý¶¯³ÌÐòÓëÊý¾ÝÔ´Ö®¼äµÄÁ¬½Ó
±ê×¼Óï·¨£º
<protocol£¨Ö÷ҪͨѶÐÒ飩>:<subprotocol£¨´ÎҪͨѶÐÒ飬¼´Çý¶¯³ÌÐòÃû³Æ£©>:<data source identifier£¨Êý¾ÝÔ´£©>
MySQLµÄJDBC URL¸ñʽ£º
jdbc:mysql//[hostname][:port]/[dbname][?param1=value1][¶m2=value2]….
ʾÀý£ºjdbc:mysql://localhost:3306/sample_db?user=root&password=your_password
³£¼û²ÎÊý£º
user ̞
password ÃÜÂë
autoReconnect Áª»úʧ°Ü£¬ÊÇ·ñÖØÐÂÁª»ú£¨true/false£©
maxReconnect ³¢ÊÔÖØÐÂÁª»ú´ÎÊý
initialTimeout ³¢ÊÔÖØÐÂÁª»ú¼ä¸ô
maxRows ´«»Ø×î´óÐÐÊý
useUnicode ÊÇ·ñʹÓÃUnicode×ÖÌå±àÂ루true/false£©
characterEncoding ºÎÖÖ±àÂ루GB2312/UTF-8/…£©
relaxAutocommit ÊÇ·ñ×Ô¶¯Ìá½»£¨true/false£©
capitalizeTypeNames Êý¾Ý¶¨ÒåµÄÃû³ÆÒÔ´óд±íʾ
½¨Á¢Á¬½Ó¶ÔÏó
String url="jdbc:mysql://localhost:3306/sample_db?user=root&password=your_password";
Connection con = DriverManager.getConnection(url);
½¨Á¢SQL³ÂÊöʽ¶ÔÏó£¨Statement Object£©
Statement stmt = con.createStatem
Ïà¹ØÎĵµ£º
ÍíÉÏÓÐÅóÓÑÎÊÆ𣬼òµ¥µÄдÁËÒ»¸ö¡£
DELIMITER $$
CREATE
FUNCTION `t_girl`
.
`func_rand_string`
(
f_num tinyint
unsigned
,
f_type tinyint
unsigned
)
RETURNS varchar
(
32)
BEGIN
......
Ò».Óï·¨
explain < table_name >
ÀýÈç: explain select * from t3 where id=3952602;
¶þ.explainÊä³ö½âÊÍ
+----+-------------+-------+-------+-------------------+---------+---------+-------+------+-------+
| id | select_type | table | type | possible_keys | key ......
ÔÚApache, PHP, MySQLµÄÌåϵ¼Ü¹¹ÖУ¬MySQL¶ÔÓÚÐÔÄܵÄÓ°Ïì×î´ó£¬Ò²ÊǹؼüµÄºËÐIJ¿·Ö¡£¶ÔÓÚDiscuz!ÂÛ̳³ÌÐòÒ²ÊÇÈç´Ë£¬MySQLµÄÉèÖÃÊÇ·ñºÏÀíÓÅ»¯£¬Ö±½ÓÓ°Ïìµ½ÂÛ̳µÄËٶȺͳÐÔØÁ¿£¡Í¬Ê±£¬MySQLÒ²ÊÇÓÅ»¯ÄѶÈ×î´óµÄÒ»¸ö²¿·Ö£¬²»µ«ÐèÒªÀí½âһЩMySQLרҵ֪ʶ£¬Í¬Ê±»¹ÐèÒª³¤Ê±¼äµÄ¹Û²ìͳ¼Æ²¢ÇÒ¸ù¾Ý¾Ñé½øÐÐÅжϣ¬È»ºóÉèÖúÏÀíµÄ²ÎÊý¡ ......
mysqlÊý¾ÝÂÒÂëÎÊÌâÔÒò¼°½â¾ö£¨×ܽáƪ£©
µÚÒ»½â¾ö·½·¨£º
ÂÒÂëÎÊÌâ¼òµ¥Ëµ¾ÍÊÇÊý¾Ý¿âдÈë¶ÁÈ¡£¬ÍøÒ³Îļþ£¬ÍøÒ³ÏÔʾʱ¼¸¸ö»·½ÚµÄ±àÂë²»Ò»ÖÂÔì³ÉµÄ¡£
ÂÒÂëÎÊÌâ
дÈëʱ£ºÒ³ÃæÌáȡдÈëÊý¾Ý±àÂëºÍдÈëÊý¾Ý¿âʱ±àÂë²»Ò»ÖÂ
¶Áȡʱ£º¶ÁÈ¡ºóËùÓñàÂëÓëÊý¾Ý¿âдÈëʱ²»Ò»ÖÂ
......
¿ÉÒÔ£¬µ«ÊÇÍêÈ«»Ö¸´ËùÓÐµÄ±í²»Ò»¶¨¿ÉÒÔ
¹¤¾ß: innodb-recovery
Official Website: http://code.google.com/p/innodb-tools/
This set of tools could be used to check InnoDB
tablespaces and to recover data from damaged tablespaces or from
dropped/truncated InnoDB tables.
Õâ¸ö¹¤¾ßÓÃÀ´¼ì²éInnoDB¿Õ¼ä±íºÍ» ......