问题描述
我有以下 OpenJPA 查询(通过 db2 数据库):
I have following OpenJPA query (over db2 database):
Select number from Number number where number.uuid = :uuid
列 uuid 定义为 VARCHAR FOR BIT DATA(16).在实体中它表示为 byte[] 类型字段.
Column uuid defined as VARCHAR FOR BIT DATA(16). In entity it represented as byte[] type field.
问题是，当我第一次使用该查询调用方法时(在 WebSphere 服务器启动后)它工作正常.后续调用会导致错误(我什至启用了跟踪日志，看看错误在哪里)
The problem is that when I call method with that query first time(after WebSphere server is up) it works fine. Consequential calls result in error (I even enabled trace log see where the error is)
1st time:> query is running, everything's ok
[11/25/15 13:27:03:803 IST] 0000001d Query 3 openjpa.Query: Trace: Executing query: [Select n from Number n where n.uuid = :uuid] with parameters: ?
[11/25/15 13:27:04:199 IST] 0000001d jdbc_SQL 3 openjpa.jdbc.SQL: Trace: <t 507109353, conn 1755254015> executing prepstmnt -1123134307 SELECT t0.NUMBER_ID, t0.comment, t0.EMPLOYEE_ID, t0.number, t0.RANGE_ID, t0.status, t0.uuid FROM PHONES.Number t0 WHERE (t0.uuid = ?) [params=?]
[11/25/15 13:27:04:249 IST] 0000001d jdbc_SQL 3 openjpa.jdbc.SQL: Trace: <t 507109353, conn 1755254015> [50 ms] spent
[11/25/15 13:27:04:251 IST] 0000001d jdbc_JDBC 3 openjpa.jdbc.JDBC: Trace: <t 507109353, conn 1755254015> [0 ms] close
2nd time:>
[11/25/15 13:27:09:068 IST] 0000001d Query 3 openjpa.Query: Trace: Executing query: [Select n from Number n where n.uuid = :uuid] with parameters: ?
[11/25/15 13:27:09:556 IST] 0000001d BusinessExcep E CNTR0020E: EJB threw an unexpected (non-declared) exception during invocation of method "approve" on bean "BeanId(PhoneAllocationEAR#PhoneAllocationEJB.jar#RangeProvider, null)". Exception data: <openjpa-2.1.2-SNAPSHOT-r422266:1548248 nonfatal user error> org.apache.openjpa.persistence.ArgumentException: Failed to execute query "Select n from Number n where n.uuid = :uuid". Check the query syntax for correctness. See nested exception for details.
这是嵌套异常:
Caused by: java.lang.NullPointerException
at org.apache.openjpa.jdbc.sql.DB2Dictionary.setBytes(DB2Dictionary.java:1037)
at org.apache.openjpa.jdbc.sql.DBDictionary.setUnknown(DBDictionary.java:1481)
at org.apache.openjpa.jdbc.sql.DBDictionary.setUnknown(DBDictionary.java:1429)
at org.apache.openjpa.jdbc.kernel.PreparedSQLStoreQuery$PreparedSQLExecutor.executeQuery(PreparedSQLStoreQuery.java:114)
at org.apache.openjpa.kernel.QueryImpl.execute(QueryImpl.java:1005)
at org.apache.openjpa.kernel.QueryImpl.execute(QueryImpl.java:863)
... 86 more
这是出现异常的代码:
public String findByUUID(UUID uuid) {
TypedQuery<Number> query = em.createQuery("Select n from Number n where n.uuid = :uuid", Number.class);
ByteBuffer bb = ByteBuffer.allocate(16);
bb.putLong(uuid.getMostSignificantBits());
bb.putLong(uuid.getLeastSignificantBits());
byte[] parameter = bb.array();
query.setParameter("uuid", parameter);
List<Number> result = new ArrayList<Number>(query.getResultList());
return result;
}
*附加信息:如果我从列描述中删除 BIT DATA - 我会收到另一个错误:
*additional info: If I drop BIT DATA from column description - I get another error :
nested exception is: javax.ejb.EJBException: See nested exception; nested exception is: org.apache.openjpa.persistence.PersistenceException: The value of input variable, expression or parameter number "1" cannot be used because of its data type.. SQLCODE=-301, SQLSTATE=07006, DRIVER=4.14.113 {prepstmnt 2039708348 SELECT t0.NUMBER_ID, t0.comment, t0.EMPLOYEE_ID, t0.number, t0.RANGE_ID, t0.status, t0.uuid FROM PHONES.Number t0 WHERE (t0.uuid = ?) [params=?]} [code=-301, state=07006]SQLCA OUTPUT[Errp=SQLRI4A4, Errd=-2145779603, 0, 0, 0, -3700, 0] The value of input variable, expression or parameter number "1" cannot be used because of its data type.. SQLCODE=-301, SQLSTATE=07006, DRIVER=4.14.113 FailedObject: Select n from Number n where n.uuid = :uuid [java.lang.String]
我是通过查看 openJPA 但同时它对我没有帮助.
I learned it from looking at source of openJPA but it doesn't help me meanwhile.
推荐答案
尝试禁用准备好的查询缓存.众所周知，它非常有问题.如果需要，您可以搜索 OpenJPA JIRA 以查找详细信息.
Try to disable the prepared query cache. It's known to be quite buggy. You can search the OpenJPA JIRA to find details if you want.
<property name="openjpa.jdbc.QuerySQLCache" value="true(EnableStatistics=true)">
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