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[英]java.lang.ClassCastException: java.math.BigDecimal cannot be cast to java.lang.Long
[英]Exception when getting Collection<Long> values using Hibernate - ClassCastException: java.math.BigDecimal cannot be cast to java.lang.Long
我有列表propertyIds。 我想按集合獲取propertyIds。 這是我的代碼:
Collection<Long> propertyIds = externalTaxManager.getPropertyIdsByTaxId(id); //Return type must be Collection<Long>
這是我的DAOImpl,
public Collection<Long> getPropertyIdsByTaxId(Long externalTaxId) {
SQLQuery query = currentSession().createSQLQuery("select b.OMH_PROPERTY_ID from OMH_EXTERNAL_TAX a , " +
"OMH_EXTERNAL_TAX_PROP_XREF b\n" +
"where a.OMH_EXTERNAL_TAX_ID=b.OMH_EXTERNAL_TAX_ID and a.OMH_EXTERNAL_TAX_ID = :externalTaxId ")
.addScalar("OMH_PROPERTY_ID" , LongType.INSTANCE);
query.setParameter("externalTaxId", externalTaxId);
Collection<BigDecimal> propertyIdsList = (Collection<BigDecimal>) query.list();
Long val = null;
Collection<Long> expRes = new HashSet<Long>();
for(BigDecimal values : propertyIdsList){
val = values.longValue();
expRes.add(val);
}
return expRes;
}
上面的查詢返回500+個與externalTaxId關聯的值。
拋出的異常是:
java.lang.ClassCastException: java.math.BigDecimal cannot be cast to java.lang.Long.
怎么了 ?
查看您的預期收益類型:
Collection<Long>
但是數據庫返回:
Collection<BigDecimal>
因此,您應該將代碼更改為:
Collection<BigDecimal> propertyIdsList = query.list();
然后嘗試以其他方式將BigDecimal轉換為Long;
^ _ ^原諒我的英語不好。
如下代碼片段對我有用。
public Collection<Long> getPropertyIdsByTaxId(Long externalTaxId) {
SQLQuery query = currentSession().createSQLQuery("select b.OMH_PROPERTY_ID from OMH_EXTERNAL_TAX a , " +
"OMH_EXTERNAL_TAX_PROP_XREF b\n" +
"where a.OMH_EXTERNAL_TAX_ID=b.OMH_EXTERNAL_TAX_ID and a.OMH_EXTERNAL_TAX_ID = :externalTaxId ")
.addScalar("OMH_PROPERTY_ID", LongType.INSTANCE);
query.setParameter("externalTaxId", externalTaxId);
Collection<BigDecimal> propertyIdsList = (Collection<BigDecimal>) query.list();
Long propertyIdsListValue = null;
Collection<Long> propertyIds = new HashSet<Long>();
for (BigDecimal propertyId : propertyIdsList) {
propertyIdsListValue = propertyId.longValue();
propertyIds.add(propertyIdsListValue);
}
return propertyIds;
}
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