java.sql.SQLException: Fail to convert to internal representation

问题

I'm trying execute following query:

String query = "select entity, entity.id from Site entity";
List resultList = entityManager.createQuery(query).getResultList();

And take exception:

[...]
Caused by: java.sql.SQLException: Fail to convert to internal representation
    at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:112)
    at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:146)
    at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:208)
    at oracle.jdbc.driver.CharCommonAccessor.getLong(CharCommonAccessor.java:239)
    at oracle.jdbc.driver.OracleResultSetImpl.getLong(OracleResultSetImpl.java:552)
    at oracle.jdbc.driver.OracleResultSet.getLong(OracleResultSet.java:1575)
    at org.jboss.resource.adapter.jdbc.WrappedResultSet.getLong(WrappedResultSet.java:724)
    at org.hibernate.type.LongType.get(LongType.java:28)
    at org.hibernate.type.NullableType.nullSafeGet(NullableType.java:163)
    at org.hibernate.type.NullableType.nullSafeGet(NullableType.java:154)
    at org.hibernate.type.ManyToOneType.hydrate(ManyToOneType.java:103)
    at org.hibernate.type.EntityType.nullSafeGet(EntityType.java:204)
    at org.hibernate.loader.hql.QueryLoader.getResultColumnOrRow(QueryLoader.java:338)
    at org.hibernate.loader.Loader.getRowFromResultSet(Loader.java:606)
    at org.hibernate.loader.Loader.doQuery(Loader.java:701)
    at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:236)
    at org.hibernate.loader.Loader.doList(Loader.java:2220)
    ... 102 more

What am I doing wrong? Thank you in advance.

回答1:

Your data types are mismatched when you are retrieving the field values. Check your code and ensure that for each field that you are retrieving that the java object matches that type. For example, retrieving a date into and int. If you are doing a select * then it is possible a change in the fields of the table has happened causing this error to occur. Your SQL should only select the fields you specifically want in order to avoid this error.

Hope this helps.

回答2:

Check your Entity class. Use String instead of Long and float instead of double .

回答3:

I had the same problem and this is my solution. I had the following code:

se.GiftDescription = rs.getString(1);
se.GiftAmount = rs.getInt(2);

And I changed it to:

se.GiftDescription = rs.getString("DESCRIPTION");
se.GiftAmount = rs.getInt("AMOUNT");

And the problem was, after I restarted my PC, the column positions changed. That's why I got this error.

回答4:

Check with your bean class. Column data type and bean datatype must be same.

来源：https://stackoverflow.com/questions/5963472/java-sql-sqlexception-fail-to-convert-to-internal-representation

标签

jpql