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04.18.2007 at 04:01AM PDT, ID: 22518251
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7.6

problem with generating a new ID using Hibernate with MySQL

Asked by mbayader in MySQL Server, Java Programming Language, J2EE

Tags: , , , ,

Hi everyone,
I have a problem with hibernate save method in the reverse engineering generated DAO classes.  I am using hibernate, myeclipse and mysql server. i dont have a prblem reading from the database, the only problem is with adding new records.

my user.hbm.xml file is as follows:
<hibernate-mapping>
    <class name="com.office.hibernate.User" table="user" catalog="officedb">
        <id name="userId" type="java.lang.Integer">
            <column name="userID" />
            <generator class="increment" />
        </id>
        <property name="loginname" type="java.lang.String">
            <column name="loginname" length="50" not-null="true" />
        </property>
        <property name="password" type="java.lang.String">
            <column name="password" length="50" not-null="true" />
        </property>
        <property name="userName" type="java.lang.String">
            <column name="userName" length="50" not-null="true" />
        </property>
        <property name="userType" type="java.lang.Integer">
            <column name="userType" not-null="true" />
        </property>
    </class>
</hibernate-mapping>

Whenever I try to save a new record to the database I get the following error:

root cause

org.hibernate.exception.GenericJDBCException: could not fetch initial value for increment generator
      org.hibernate.exception.SQLStateConverter.handledNonSpecificException(SQLStateConverter.java:103)
      org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:91)
      org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:43)
      org.hibernate.id.IncrementGenerator.getNext(IncrementGenerator.java:107)
      org.hibernate.id.IncrementGenerator.generate(IncrementGenerator.java:44)
      org.hibernate.event.def.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:91)
      org.hibernate.event.def.DefaultSaveOrUpdateEventListener.saveWithGeneratedOrRequestedId(DefaultSaveOrUpdateEventListener.java:186)
      org.hibernate.event.def.DefaultSaveEventListener.saveWithGeneratedOrRequestedId(DefaultSaveEventListener.java:33)
      org.hibernate.event.def.DefaultSaveOrUpdateEventListener.entityIsTransient(DefaultSaveOrUpdateEventListener.java:175)
      org.hibernate.event.def.DefaultSaveEventListener.performSaveOrUpdate(DefaultSaveEventListener.java:27)
      org.hibernate.event.def.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:70)
      org.hibernate.impl.SessionImpl.fireSave(SessionImpl.java:530)
      org.hibernate.impl.SessionImpl.save(SessionImpl.java:518)
      org.hibernate.impl.SessionImpl.save(SessionImpl.java:514)
      com.studentadminsystem.hibernate.UserDAO.save(UserDAO.java:29)



root cause

java.sql.SQLException: No database selected
      com.mysql.jdbc.SQLError.createSQLException(SQLError.java:946)
      com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:2941)
      com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:1623)
      com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:1715)
      com.mysql.jdbc.Connection.execSQL(Connection.java:3249)
      com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:1268)
      com.mysql.jdbc.PreparedStatement.executeQuery(PreparedStatement.java:1403)
      org.hibernate.id.IncrementGenerator.getNext(IncrementGenerator.java:85)
      org.hibernate.id.IncrementGenerator.generate(IncrementGenerator.java:44)
      org.hibernate.event.def.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:91)
      org.hibernate.event.def.DefaultSaveOrUpdateEventListener.saveWithGeneratedOrRequestedId(DefaultSaveOrUpdateEventListener.java:186)
      org.hibernate.event.def.DefaultSaveEventListener.saveWithGeneratedOrRequestedId(DefaultSaveEventListener.java:33)
      org.hibernate.event.def.DefaultSaveOrUpdateEventListener.entityIsTransient(DefaultSaveOrUpdateEventListener.java:175)
      org.hibernate.event.def.DefaultSaveEventListener.performSaveOrUpdate(DefaultSaveEventListener.java:27)
      org.hibernate.event.def.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:70)
      org.hibernate.impl.SessionImpl.fireSave(SessionImpl.java:530)
      org.hibernate.impl.SessionImpl.save(SessionImpl.java:518)
      org.hibernate.impl.SessionImpl.save(SessionImpl.java:514)
      com.studentadminsystem.hibernate.UserDAO.save(UserDAO.java:29Start Free Trial
[+][-]04.18.2007 at 04:07AM PDT, ID: 18930661

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[+][-]04.18.2007 at 04:15AM PDT, ID: 18930687

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[+][-]04.18.2007 at 04:19AM PDT, ID: 18930700

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About this solution

Zones: MySQL Server, Java Programming Language, J2EE
Tags: hibernate, increment, initial, mysql, generator
Sign Up Now!
Solution Provided By: mnrz
Participating Experts: 2
Solution Grade: B
 
 
[+][-]04.18.2007 at 06:11AM PDT, ID: 18931338

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