| 发表于：2008-01-19 18:09:56 楼主 |
console:
hibernate: select student0_.id as id1_, student0_.name as name1_, student0_.sex as sex1_, student0_.age as age1_, student0_.password as password1_ from tomcatusers.student student0_
hibernate: select max（id) from student
log4j:warn no appenders could be found for logger （dao.studentdao).
log4j:warn please initialize the log4j system properly.
exception in thread "main" org.hibernate.exception.genericjdbcexception: could not fetch initial value for increment generator
at org.hibernate.exception.sqlstateconverter.handlednonspecificexception（sqlstateconverter.java:103)
at org.hibernate.exception.sqlstateconverter.convert（sqlstateconverter.java:91)
at org.hibernate.exception.jdbcexceptionhelper.convert（jdbcexceptionhelper.java:43)
at org.hibernate.id.incrementgenerator.getnext（incrementgenerator.java:107)
at org.hibernate.id.incrementgenerator.generate（incrementgenerator.java:44)
at org.hibernate.event.def.abstractsaveeventlistener.savewithgeneratedid（abstractsaveeventlistener.java:91)
at org.hibernate.event.def.defaultsaveorupdateeventlistener.savewithgeneratedorrequestedid（defaultsaveorupdateeventlistener.java:186)
at org.hibernate.event.def.defaultsaveeventlistener.savewithgeneratedorrequestedid（defaultsaveeventlistener.java:33)
at org.hibernate.event.def.defaultsaveorupdateeventlistener.entityistransient（defaultsaveorupdateeventlistener.java:175)
at org.hibernate.event.def.defaultsaveeventlistener.performsaveorupdate（defaultsaveeventlistener.java:27)
at org.hibernate.event.def.defaultsaveorupdateeventlistener.onsaveorupdate（defaultsaveorupdateeventlistener.java:70)
at org.hibernate.impl.sessionimpl.firesave（sessionimpl.java:530)
at org.hibernate.impl.sessionimpl.save（sessionimpl.java:518)
at org.hibernate.impl.sessionimpl.save（sessionimpl.java:514)
at dao.studentdao.save（studentdao.java:33)
at test.daotest.main（daotest.java:28)
caused by: java.sql.sqlexception: no database selected
at com.mysql.jdbc.sqlerror.createsqlexception（sqlerror.java:1056)
at com.mysql.jdbc.sqlerror.createsqlexception（sqlerror.java:957)
at com.mysql.jdbc.mysqlio.checkerrorpacket（mysqlio.java:3376)
at com.mysql.jdbc.mysqlio.checkerrorpacket（mysqlio.java:3308)
at com.mysql.jdbc.mysqlio.sendcommand（mysqlio.java:1837)
at com.mysql.jdbc.mysqlio.sqlquerydirect（mysqlio.java:1961)
at com.mysql.jdbc.connectionimpl.ＥＸＥＣsql（connectionimpl.java:2543)
at com.mysql.jdbc.preparedstatement.ＥＸＥＣuteinternal（preparedstatement.java:1737)
at com.mysql.jdbc.preparedstatement.ＥＸＥＣutequery（preparedstatement.java:1888)
at org.hibernate.id.incrementgenerator.getnext（incrementgenerator.java:85)
... 12 more
hbm.xml:
- xml code
<hibernate-mapping>
<class name="dao.student" table="student" catalog="tomcatusers">
<id name="id" type="java.lang.integer">
<column name="id" />
<generator class="increment" />
</id>
<property name="name" type="java.lang.string">
<column name="name" length="16" />
</property>
<property name="sex" type="java.lang.byte">
<column name="sex" />
</property>
<property name="age" type="java.lang.integer">
<column name="age">
<comment></comment>
</column>
</property>
<property name="password" type="java.lang.string">
<column name="password" length="16" />
</property>
</class>
</hibernate-mapping>
code:
- java code
studentdao dao = new studentdao （);
list<student> list = dao.findall（);
transaction ts = dao.getsession（).gettransaction（);
student student = new student（);
student.setage（26);
student.setname（ "testname");
student.setpassword（ "1234");
student.setsex（byte.valueof（"1"));
dao.save（student);
ts.commit（);
dao.getsession（).close（);
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