[hibernate-issues] [Hibernate-JIRA] Commented: (HHH-2220) session.createSQLQuery(sql) translates database type CHAR(n) to Java type char instead of String

[Allen Yu (JIRA)]

    [ http://opensource.atlassian.com/projects/hibernate/browse/HHH-2220?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_27419 ] 

Allen Yu commented on HHH-2220:
-------------------------------

The problem is also confirmed on MYSQL
INFO: RDBMS: MySQL, version: 5.0.38-Ubuntu_0ubuntu1-log
INFO: JDBC driver: MySQL-AB JDBC Driver, version: mysql-connector-java-5.0.6 ( $Date: 2007-03-09 22:13:57 +0100 (Fri, 09 Mar 2007) $, $Revision: 6341 $ )
INFO: Using dialect: org.hibernate.dialect.MySQLDialect 

Other settings:
INFO: Hibernate Annotations 3.3.0.GA
INFO: Hibernate 3.2.4.sp1
INFO: using JDK 1.4 java.sql.Timestamp handling
INFO: Hibernate EntityManager 3.3.1.GA

Temporary solution:
Problem can be solved by forcing Hibernate.STRING type on the column.

CREATE TABLE  `IN_CATEGORY` (
  `CATEGORY_ID` int(11) NOT NULL auto_increment,
  `PREFIX` char(2) NOT NULL,
  `EXTENSION` char(3) NOT NULL,
  `PARENT_ID` int(11) default NULL,
  PRIMARY KEY  (`CATEGORY_ID`),
  UNIQUE KEY `CATEGORY` (`PREFIX`,`EXTENSION`),
  KEY `FK_PARENT_ID` (`PARENT_ID`),
  CONSTRAINT `FK_PARENT_ID` FOREIGN KEY (`PARENT_ID`) REFERENCES `IN_CATEGORY` (`CATEGORY_ID`) ON DELETE CASCADE ON UPDATE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=utf8 

Ex.
SQLQuery query = session.createSQLQuery("SELECT PREFIX, EXTENSION FROM IN_CATEGORY");
query.addScalar("PREFIX", Hibernate.STRING);
query.addScalar("EXTENSION", Hibernate.STRING);


> session.createSQLQuery(sql) translates database type CHAR(n) to Java type char instead of String
> ------------------------------------------------------------------------------------------------
>
>                 Key: HHH-2220
>                 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-2220
>             Project: Hibernate3
>          Issue Type: Bug
>          Components: query-sql
>    Affects Versions: 3.2.0.ga
>            Reporter: Regis Pires Magalhaes
>
> createSQLQuery() method translates database type CHAR(n) to Java type char instead of String when using setResultTransformer(Criteria.ALIAS_TO_ENTITY_MAP).
> That happens when I do not use addScalar(). And that is the only problem that I have found when not filling return types in advance.
> A workaround I have made is to concatenate the projected field with an empty string (''). See example below:
> ...
> query.setResultTransformer(Criteria.ALIAS_TO_ENTITY_MAP);
> String sqlQuery = "select s.name state from state s where s.name='PI' ";
> query = session.createSQLQuery(sqlQuery);
> ...
> result: [{STATE=P}]
> name field is CHAR(2) in database definition (PostgreSQL, HSQLDB and Oracle were tested).
> Note that it works when I concatenate the field used in projection with an empty string:
> ...
> String sqlQuery = "select s.name || '' state from state s where s.name='PI' ";
> ...
> result: [{STATE=PI}]

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