Changing POJO class after Domain to Table creation using SchemaExport!

[Roshni Chandrashekar]

Hi All,

We are trying to create database tables from our already existing domain Pojo classes and I am using SchemaExport to create them. Problem is, If I change the pojo class like adding a new attribute (enumStatus) after table creation and run it, I am getting Caused by: com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: Unknown column 'enumStatus' in 'field list' error. I am using the schema export as se.execute(true, true, false, true); so that when the app runs, existing tables are not dropped and the data is not lost. Below is the sample code I have been trying to execute. Please advice on how to avoid this error and facilitate future changes to the POJOs.


hibernate.cfg.xml:

<?xml version="1.0" encoding="UTF-8"?>
 <!DOCTYPE hibernate-configuration PUBLIC
        "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
        "http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
  <session-factory>
    <property name="connection.driver_class">com.mysql.jdbc.Driver</property>
    <property name="connection.url">jdbc:mysql://localhost:3306/testDB</property>
    <property name="connection.username">test</property>
    <property name="connection.password">test123</property>
    <property name="show_sql">true</property>
    <property name="dialect">org.hibernate.dialect.MySQLDialect</property>
    <property name="hibernate.default_schema">testSchema</property>
  </session-factory>
</hibernate-configuration>

Person.java:

@Entity
@Inheritance(strategy = InheritanceType.JOINED)
public abstract class Person {

    private int id;

    private String name;

    private IssueStatusEnum enumStatus;    //Added this after tables are already created and this is why its failing

 

    @Column(columnDefinition = "enum('ACTIVE','RESOLVED','CANCELED')")
    public IssueStatusEnum getEnumStatus() {
        return enumStatus;
    }

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    public int getId() {
        return id;
    }


    public String getName() {
        return name;
    }


    public void setEnumStatus(final IssueStatusEnum enumStatus) {
        this.enumStatus = enumStatus;
    }


    public void setId(final int id) {
        this.id = id;
    }


    public void setName(final String name) {
        this.name = name;
    }

}

FulltimeEmployee.java

import javax.persistence.Entity;
import javax.persistence.PrimaryKeyJoinColumn;
import org.hibernate.annotations.Type;
import org.joda.time.DateTime;


@Entity
@PrimaryKeyJoinColumn(name = "id")
public class FulltimeEmployee extends Person {

    private String departmentName;

    private int salary;

    private DateTime hireDate;



    public String getDepartmentName() {
        return departmentName;
    }

    @Type(type = "org.jadira.usertype.dateandtime.joda.PersistentDateTime")
    public DateTime getHireDate() {
        return hireDate;
    }

    public int getSalary() {
        return salary;
    }


    public void setDepartmentName(final String departmentName) {
        this.departmentName = departmentName;
    }


    public void setHireDate(final DateTime hireDate) {
        this.hireDate = hireDate;
    }

    public void setSalary(final int salary) {
        this.salary = salary;
    }

}

ContractEmployee.java

import javax.persistence.Entity;
import javax.persistence.PrimaryKeyJoinColumn;


@Entity
@PrimaryKeyJoinColumn(name = "id")
public class ContractEmployee extends Person {

    private String departmentName;


    public String getDepartmentName() {
        return departmentName;
    }


    public void setDepartmentName(final String departmentName) {
        this.departmentName = departmentName;
    }

}

Main.java:

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;
import org.hibernate.tool.hbm2ddl.SchemaExport;
import org.joda.time.DateTime;


public class Main {

    public static void main(final String args[]) {

        Configuration config = new Configuration();
        config.addAnnotatedClass(ContractEmployee.class);
        config.addAnnotatedClass(FulltimeEmployee.class);

        config.configure("hibernate.cfg.xml");

        SchemaExport se = new SchemaExport(config);
        se.execute(true, true, false, true);
        // new SchemaExport(config).create(true, true);

        SessionFactory factory = config.buildSessionFactory();
        Session session = factory.openSession();

        session.beginTransaction();

        ContractEmployee cEmployee = new ContractEmployee();
        cEmployee.setName("Don");
        cEmployee.setDepartmentName("Technology");
        cEmployee.setEnumStatus(IssueStatusEnum.ACTIVE);

        FulltimeEmployee fEmployee = new FulltimeEmployee();
        fEmployee.setName("Ken");
        fEmployee.setDepartmentName("Business");
        fEmployee.setSalary(1000);
        DateTime dt = DateTime.now();

        fEmployee.setHireDate(DateTime.now());

        session.save(cEmployee);
        session.save(fEmployee);

        session.getTransaction().commit();
        session.close();

    }
}

Error stack trace:

Exception in thread "main" org.hibernate.exception.SQLGrammarException: could not execute statement
	at org.hibernate.exception.internal.SQLExceptionTypeDelegate.convert(SQLExceptionTypeDelegate.java:82)
	at org.hibernate.exception.internal.StandardSQLExceptionConverter.convert(StandardSQLExceptionConverter.java:49)
	at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:125)
	at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:110)
	at org.hibernate.engine.jdbc.internal.ResultSetReturnImpl.executeUpdate(ResultSetReturnImpl.java:136)
	at org.hibernate.id.IdentityGenerator$GetGeneratedKeysDelegate.executeAndExtract(IdentityGenerator.java:96)
	at org.hibernate.id.insert.AbstractReturningDelegate.performInsert(AbstractReturningDelegate.java:58)
	at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:2975)
	at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:3487)
	at org.hibernate.action.internal.EntityIdentityInsertAction.execute(EntityIdentityInsertAction.java:81)
	at org.hibernate.engine.spi.ActionQueue.execute(ActionQueue.java:377)
	at org.hibernate.engine.spi.ActionQueue.addResolvedEntityInsertAction(ActionQueue.java:214)
	at org.hibernate.engine.spi.ActionQueue.addInsertAction(ActionQueue.java:194)
	at org.hibernate.engine.spi.ActionQueue.addAction(ActionQueue.java:178)
	at org.hibernate.event.internal.AbstractSaveEventListener.addInsertAction(AbstractSaveEventListener.java:321)
	at org.hibernate.event.internal.AbstractSaveEventListener.performSaveOrReplicate(AbstractSaveEventListener.java:286)
	at org.hibernate.event.internal.AbstractSaveEventListener.performSave(AbstractSaveEventListener.java:192)
	at org.hibernate.event.internal.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:125)
	at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.saveWithGeneratedOrRequestedId(DefaultSaveOrUpdateEventListener.java:206)
	at org.hibernate.event.internal.DefaultSaveEventListener.saveWithGeneratedOrRequestedId(DefaultSaveEventListener.java:55)
	at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.entityIsTransient(DefaultSaveOrUpdateEventListener.java:191)
	at org.hibernate.event.internal.DefaultSaveEventListener.performSaveOrUpdate(DefaultSaveEventListener.java:49)
	at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:90)
	at org.hibernate.internal.SessionImpl.fireSave(SessionImpl.java:764)
	at org.hibernate.internal.SessionImpl.save(SessionImpl.java:756)
	at org.hibernate.internal.SessionImpl.save(SessionImpl.java:752)
	at Main.main(Main.java:55)
Caused by: com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: Unknown column 'enumStatus' in 'field list'
	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
	at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
	at java.lang.reflect.Constructor.newInstance(Constructor.java:525)
	at com.mysql.jdbc.Util.handleNewInstance(Util.java:411)
	at com.mysql.jdbc.Util.getInstance(Util.java:386)
	at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1054)
	at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:4120)
	at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:4052)
	at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2503)
	at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2664)
	at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2815)
	at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:2155)
	at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2458)
	at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2375)
	at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2359)
	at org.hibernate.engine.jdbc.internal.ResultSetReturnImpl.executeUpdate(ResultSetReturnImpl.java:133)

Thanks

[Roshni Chandrashekar]

Ok, If I delete the existing tables and run it, even then it wont work. Gives me error. Only if I comment out the below in the main class its working

   cEmployee.setEnumStatus(OpsIssueStatusEnum.ACTIVE);

  fEmployee.setEnumStatus(OpsIssueStatusEnum.CANCELED);

.

Any idea why?

ERROR: Data truncated for column 'enumStatus' at row 1
Exception in thread "main" org.hibernate.exception.GenericJDBCException: could not execute statement
	at org.hibernate.exception.internal.StandardSQLExceptionConverter.convert(StandardSQLExceptionConverter.java:54)
	at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:125)
	at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:110)
	at org.hibernate.engine.jdbc.internal.ResultSetReturnImpl.executeUpdate(ResultSetReturnImpl.java:136)
	at org.hibernate.id.IdentityGenerator$GetGeneratedKeysDelegate.executeAndExtract(IdentityGenerator.java:96)
	at org.hibernate.id.insert.AbstractReturningDelegate.performInsert(AbstractReturningDelegate.java:58)
	at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:2975)
	at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:3487)
	at org.hibernate.action.internal.EntityIdentityInsertAction.execute(EntityIdentityInsertAction.java:81)
	at org.hibernate.engine.spi.ActionQueue.execute(ActionQueue.java:377)
	at org.hibernate.engine.spi.ActionQueue.addResolvedEntityInsertAction(ActionQueue.java:214)
	at org.hibernate.engine.spi.ActionQueue.addInsertAction(ActionQueue.java:194)
	at org.hibernate.engine.spi.ActionQueue.addAction(ActionQueue.java:178)
	at org.hibernate.event.internal.AbstractSaveEventListener.addInsertAction(AbstractSaveEventListener.java:321)
	at org.hibernate.event.internal.AbstractSaveEventListener.performSaveOrReplicate(AbstractSaveEventListener.java:286)
	at org.hibernate.event.internal.AbstractSaveEventListener.performSave(AbstractSaveEventListener.java:192)
	at org.hibernate.event.internal.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:125)
	at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.saveWithGeneratedOrRequestedId(DefaultSaveOrUpdateEventListener.java:206)
	at org.hibernate.event.internal.DefaultSaveEventListener.saveWithGeneratedOrRequestedId(DefaultSaveEventListener.java:55)
	at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.entityIsTransient(DefaultSaveOrUpdateEventListener.java:191)
	at org.hibernate.event.internal.DefaultSaveEventListener.performSaveOrUpdate(DefaultSaveEventListener.java:49)
	at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:90)
	at org.hibernate.internal.SessionImpl.fireSave(SessionImpl.java:764)
	at org.hibernate.internal.SessionImpl.save(SessionImpl.java:756)
	at org.hibernate.internal.SessionImpl.save(SessionImpl.java:752)
	at Main.main(Main.java:55)
Caused by: java.sql.SQLException: Data truncated for column 'enumStatus' at row 1
	at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1078)
	at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:4120)
	at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:4052)
	at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2503)
	at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2664)
	at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2815)
	at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:2155)
	at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2458)
	at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2375)
	at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2359)
	at org.hibernate.engine.jdbc.internal.ResultSetReturnImpl.executeUpdate(ResultSetReturnImpl.java:133)
	... 22 more