我沒有運氣讓hibernate(使用HSQLDB)查詢工作。查詢的代碼如下所示:使用枚舉作爲參數的休眠查詢
Query query = session.createQuery("from "+tableName+" where CURRENCY = :currency");
query.setParameter("currency",currency);
List<ExchangeRate> list = query.list();
我始終得到 「:org.hsqldb.HsqlException:通過在引起不兼容的轉換數據類型」:
org.hibernate.exception.SQLGrammarException: could not execute query
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.loader.Loader.doList(Loader.java:2529)
at org.hibernate.loader.Loader.doList(Loader.java:2512)
at org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2342)
at org.hibernate.loader.Loader.list(Loader.java:2337)
at org.hibernate.loader.hql.QueryLoader.list(QueryLoader.java:495)
at org.hibernate.hql.internal.ast.QueryTranslatorImpl.list(QueryTranslatorImpl.java:357)
at org.hibernate.engine.query.spi.HQLQueryPlan.performList(HQLQueryPlan.java:195)
at org.hibernate.internal.SessionImpl.list(SessionImpl.java:1275)
at org.hibernate.internal.QueryImpl.list(QueryImpl.java:101)
at com.rockymountaineer.wsapi.db.test.ExchangeRateDAOTest.getRate(ExchangeRateDAOTest.java:27)
at com.rockymountaineer.wsapi.db.test.ExchangeRateDAOTest.main(ExchangeRateDAOTest.java:39)
Caused by: java.sql.SQLSyntaxErrorException: incompatible data type in conversion
at org.hsqldb.jdbc.JDBCUtil.sqlException(Unknown Source)
at org.hsqldb.jdbc.JDBCUtil.throwError(Unknown Source)
at org.hsqldb.jdbc.JDBCPreparedStatement.setParameter(Unknown Source)
at org.hsqldb.jdbc.JDBCPreparedStatement.setBytes(Unknown Source)
at org.hibernate.type.descriptor.sql.VarbinaryTypeDescriptor$1.doBind(VarbinaryTypeDescriptor.java:57)
at org.hibernate.type.descriptor.sql.BasicBinder.bind(BasicBinder.java:93)
at org.hibernate.type.AbstractStandardBasicType.nullSafeSet(AbstractStandardBasicType.java:280)
at org.hibernate.type.AbstractStandardBasicType.nullSafeSet(AbstractStandardBasicType.java:275)
at org.hibernate.param.NamedParameterSpecification.bind(NamedParameterSpecification.java:66)
at org.hibernate.loader.hql.QueryLoader.bindParameterValues(QueryLoader.java:612)
at org.hibernate.loader.Loader.prepareQueryStatement(Loader.java:1875)
at org.hibernate.loader.Loader.executeQueryStatement(Loader.java:1836)
at org.hibernate.loader.Loader.executeQueryStatement(Loader.java:1816)
at org.hibernate.loader.Loader.doQuery(Loader.java:900)
at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:342)
at org.hibernate.loader.Loader.doList(Loader.java:2526)
... 10 more
Caused by: org.hsqldb.HsqlException: incompatible data type in conversion
at org.hsqldb.error.Error.error(Unknown Source)
at org.hsqldb.error.Error.error(Unknown Source)
at org.hsqldb.types.NumberType.convertToDefaultType(Unknown Source)
... 24 more
類被註釋,如下所示:
@Column(name="CURRENCY", nullable=false)
public CurrencyType getCurrency() {
return currency;
}
...和枚舉類型的樣子:
public enum CurrencyType {
CAD, AUD, EUR, GBP, USD;
/**
* @param currency
* @return
*/
public static CurrencyType getByCurrency(String currency) {
if(currency!=null) {
for(CurrencyType type : CurrencyType.values()) {
if(type.name().equals(currency)) return type;
}
}
return null;
}
}
根據我對Hibernate文檔的理解,這應該是完全可行的 - 更不用說我目前能夠使用其他hibernate方法保存,編輯,刪除,查詢(通過id)對象 - 但是「createQuery」被證明是固執的。
如果有人能幫助,我會誠摯地感謝! 乾杯,
亞歷