Correct JPA Annotation for PostgreSQL's text type without Hibernate Annotations

Question

I\'m developing an application using:

• Java 1.7
• JPA (included in javaee-api 7.0)
• Hibernate 4.3.8.Final
• PostgreSQL-JDBC 9.4-1200-jdbc4

Answer 1

If you want to use plain JPA you could just remap the used CLOB type on the Dialect like this:

public class PGSQLMapDialect extends PostgreSQL9Dialect {


  @Override
  public SqlTypeDescriptor remapSqlTypeDescriptor(SqlTypeDescriptor sqlTypeDescriptor) {
    if (Types.CLOB == sqlTypeDescriptor.getSqlType()) {
      return LongVarcharTypeDescriptor.INSTANCE;
    }
    return super.remapSqlTypeDescriptor(sqlTypeDescriptor);
  }


}

So it won't use the CLOB mapping from the JDBC driver which uses a OID for the column and stores/loads the text via large object handling. This would just result in setString and getString calls on the createt text column on the Postgres JDBC Driver via the VarcharTypeDescriptor class.