利用p6spy記錄和分析jdbc sql日志

p6spy 可以輸出日志到文件中、控制臺、或者傳遞給 Log4j，而且還能配搭 SQL Profiler 或 IronTrackSQL 圖形化監控 SQL 語句，監測到哪些語句的執行是耗時的，逐個優化。關于與 SQL Profiler 或 IronTrackSQL 的配合使用可參數文件的鏈接。 

p6spy在sourceforge上下載：http://sourceforge.net/projects/p6spy/?source=dlp

p6spy的配置：
第一：p6spy.jar放入應用的classpath下
第二：修改連接池或者連接配置的jdbc的驅動為p6spy所提供的驅動，com.p6spy.engine.spy.P6SpyDriver

在單獨的Hibernate的應用中，數據庫驅動配置在hibernate.cfg.xml里面,所以我需要配置文件中的connection.driver_class屬性從oracle.jdbc.driver.OracleDriver改為com.p6spy.engine.spy.P6SpyDriver其他的用戶名密碼等等配置信息全部不用修改.在web程序中，配置的連接池部分，也只需要修改jdbc-driver的配置即可。

<session-factory>
    <!-- 在這里改成p6spy提供的數據源 -->
    <property name="connection.driver_class">com.p6spy.engine.spy.P6SpyDriver</property>       
    <property name="connection.url">jdbc:oracle:thin:@localhost:1521:orcl</property>
    <property name="connection.username">scott</property>
    <property name="connection.password">tiger</property>
    <property name="connection.pool_size">1</property>
    <property name="dialect">org.hibernate.dialect.Oracle9Dialect</property>
    <property name="current_session_context_class">thread</property>
    <property name="cache.provider_class">org.hibernate.cache.NoCacheProvider</property>
    <property name="show_sql">true</property>
    <property name="hbm2ddl.auto">false</property>
    <property name="hibernate.jdbc.batch_size">0</property>
</session-factory>

（文件內容太多了，僅附上幾處重要的）

#################################################################
# MODULES                                                       #
#                                                               #
# Modules provide the P6Spy functionality.  If a module, such   #
# as module_log is commented out, that functionality will not   #
# be available.  If it is not commented out (if it is active),  #
# the functionality will be active.                             #
#                                                               #
# Values set in Modules cannot be reloaded using the            #
# reloadproperties variable.  Once they are loaded, they remain #
# in memory until the application is restarted.                 #
#                                                               #
#################################################################
#第一：module.log的屬性必須配置，如果不配置，P6SPY將不起任何作用，典型配置：
module.log=com.p6spy.engine.logging.P6LogFactory
#module.outage=com.p6spy.engine.outage.P6OutageFactory

#################################################################
# REALDRIVER(s)                                                 #
#                                                               #
# In your application server configuration file you replace the #
# "real driver" name with com.p6spy.engine.P6SpyDriver. This is #
# where you put the name of your real driver P6Spy can find and #
# register your real driver to do the database work.            #
#                                                               #
# If your application uses several drivers specify them in      #
# realdriver2, realdriver3.  See the documentation for more     #
# details.                                                      #
#                                                               #
# Values set in REALDRIVER(s) cannot be reloaded using the      #
# reloadproperties variable.  Once they are loaded, they remain #
# in memory until the application is restarted.                 #
#                                                               #
#################################################################

#第二：數據庫驅動配置，你懂的，不多說了
# oracle driver
# realdriver=oracle.jdbc.driver.OracleDriver

# mysql Connector/J driver
# realdriver=com.mysql.jdbc.Driver

# informix driver
# realdriver=com.informix.jdbc.IfxDriver

# ibm db2 driver
# realdriver=COM.ibm.db2.jdbc.net.DB2Driver

# the mysql open source driver
realdriver=org.gjt.mm.mysql.Driver

#specifies another driver to use
realdriver2=
#specifies a third driver to use
realdriver3=

#第三：appender配置，一般分為三種
#specifies the appender to use for logging
#appender=com.p6spy.engine.logging.appender.Log4jLogger
#控制臺
#appender=com.p6spy.engine.logging.appender.StdoutLogger
appender=com.p6spy.engine.logging.appender.FileLogger

# name of logfile to use, note Windows users should make sure to use forward slashes in their pathname (e:/test/spy.log) (used for file logger only)
#日志文件存放路徑及文件名
logfile     = spy.log

# append to  the p6spy log file.  if this is set to false the
# log file is truncated every time.  (file logger only)
append=true

#The following are for log4j logging only
log4j.appender.STDOUT=org.apache.log4j.ConsoleAppender
log4j.appender.STDOUT.layout=org.apache.log4j.PatternLayout
log4j.appender.STDOUT.layout.ConversionPattern=p6spy - %m%n

log4j.logger.p6spy=INFO,STDOUT