Hibernate开发配置
Hibernate开发配置:
首先加入Hibernate和相应数据库所需要的jar包
接着配置Hibernate和数据库连接的配置文件hibernate.cfg.xml：（位于src目录下）
Hibernate加载其配置文件hibernate.properties和hibernate.cfg.xml,常用xml文件比较直观，方便管理， Hibernate 是一个流行的开源对象关系映射工具，方便连接不同数据库，更换数据库，只要修改Hibernate配置文件，大度减少项目的维护。
完整的配置如下:
<! DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd" >
< hibernate-configuration >
< session-factory >
<!-- Database connection settings -->
< property name ="connection.driver_class" > org.hsqldb.jdbcDriver </ property >//驱动的地址
< property name ="connection.url" > jdbc:hsqldb:hsql://localhost /test</ property >//配置url，其中test为数据库的名字
< property name ="connection.username" > sa </ property >
< property name ="connection.password" ></ property >
<!-- JDBC connection pool (use the built-in) -->
< property name ="connection.pool_size" > 1 </ property >
<!-- SQL dialect -->用于配置适配器，用于移植其他数据库
< property name ="dialect" > org.hibernate.dialect.HSQLDialect </ property >
<!-- Enable Hibernate's automatic session context management -->
< property name ="current_session_context_class" > thread </ property >
<!-- Disable the second-level cache -->
< property name ="cache.provider_class" > org.hibernate.cache.NoCacheProvider </ property >
<!-- Echo all executed SQL to stdout -->
< property name ="show_sql" > true </ property >
<!-- Drop and re-create the database schema on startup -->
< property name ="hbm2ddl.auto" > create </ property >//这个属性设置成create的意思是，每次执行生成表的类时，所有的表都会删除然后再重建一次，这样表里面原来的数据就没了。可以设成update，这样只有表改动了才会删除表，然后重建表，如果表没有变，就不会这样做，这样数据就不会丢失。
< mapping resource ="../*.hbm.xml" />
</ session-factory >
</ hibernate-configuration >
常用数据库连接（包括适配器【方言】，驱动类，数据库url，用户和密码）
MySql 3/4/5:
< property name ="connection.driver_class" > com.mysql.jdbc.Driver </ property >
< property name ="connection.url" > jdbc:mysql://localhost:3306/test </ property >
< property name ="connection.username" > root </ property >
< property name ="connection.password" > </property>
Microsoft SQLServer (via jTDS):
< property name ="connection.driver_class" > net.sourceforge.jtds.jdbc.Driver </ property >
< property name ="connection.url" > jdbc:jtds:sqlserver://localhost:1433/test;useCursors=true </ property >
< property name ="connection.username" > sa </ property >
< property name ="connection.password" ></ property >
IBM DB2:
< property name ="connection.driver_class" > com.ibm.db2.jcc.DB2Driver </ property >
< property name ="connection.url" > jdbc:db2://localhost:50000/test </ property >
< property name ="connection.username" > db2inst1 </ property >
< property name ="connection.password" ></ property >
Oracle:
< property name ="connection.driver_class" > oracle.jdbc.driver.OracleDriver </ property >
< property name ="connection.url" > jdbc:oracle:thin:@localhost:1521:test </ property >
< property name ="connection.username" > ora </ property >
< property name ="connection.password" ></ property >
Informix:
< property name ="connection.driver_class" > com.informix.jdbc.IfxDriver </ property >
< property name ="connection.url" > jdbc:informix-sqli://localhost:1526/test:informixserver=server1 </ property >
< property name ="connection.username" > root </ property >
< property name ="connection.password" ></ property >
< property name ="connection.encoding" > true </ property >
Sybase (via jTDS):
< property name ="connection.driver_class" > net.sourceforge.jtds.jdbc.Driver </ property >
< property name ="connection.url" > jdbc:jtds:sybase://localhost:7100/test;useCursors=true </ property >
< property name ="connection.username" > root </ property >
< property name ="connection.password" ></ property >
PostgreSQL:
< property name ="connection.driver_class" > org.postgresql.Driver </ property >
< property name ="connection.url" > jdbc:postgresql://localhost:5432/test </ property >
< property name ="connection.username" > root </ property >
< property name ="connection.password" ></ property >
MaxDB(SAPDB):
< property name ="connection.driver_class" > com.sap.dbtech.jdbc.DriverSapDB </ property >
< property name ="connection.url" > jdbc:sapdb://localhost/test </ property >
< property name ="connection.username" > root </ property >
< property name ="connection.password" ></ property >
接着配置日志文件：log4j.properties（位于src目录下），为了便于调试.(这个可以不配)
### direct log messages to stdout ###
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.Target=System.out
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%d{ABSOLUTE} %5p %c{1}:%L - %m%n
### direct messages to file hibernate.log ###
#log4j.appender.file=org.apache.log4j.FileAppender
#log4j.appender.file.File=hibernate.log
#log4j.appender.file.layout=org.apache.log4j.PatternLayout
#log4j.appender.file.layout.ConversionPattern=%d{ABSOLUTE} %5p %c{1}:%L - %m%n
### set log levels - for more verbose logging change 'info' to 'debug' ###
log4j.rootLogger=warn, stdout//除了这个不可以注释掉之外，其他的都可以注释掉
#log4j.logger.org.hibernate=info
#log4j.logger.org.hibernate=debug
### log HQL query parser activity
#log4j.logger.org.hibernate.hql.ast.AST=debug
### log just the SQL
#log4j.logger.org.hibernate.SQL=debug
### log JDBC bind parameters ###
#log4j.logger.org.hibernate.type=info
#log4j.logger.org.hibernate.type=debug
### log schema export/update ###
#log4j.logger.org.hibernate.tool.hbm2ddl=debug
### log HQL parse trees
#log4j.logger.org.hibernate.hql=debug
### log cache activity ###
#log4j.logger.org.hibernate.cache=debug
### log transaction activity
#log4j.logger.org.hibernate.transaction=debug
### log JDBC resource acquisition
#log4j.logger.org.hibernate.jdbc=debug
### enable the following line if you want to track down connection ###
### leakages when using DriverManagerConnectionProvider ###
#log4j.logger.org.hibernate.connection.DriverManagerConnectionProvider=trace