我在使用jpa eclipselink和mysql 5.7数据库时创建查询包含union我得到错误
Internal Exception: com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'UNION ALL (SELECT t1.id, t1.fullName FROM PatientTable t1))' at line 1
查询代码为
EntityManager entityManager = DataMain.createEntityManager();
String queryString = "";
queryString = "" +
"select " +
" PatientTable.id, PatientTable.fullName " +
"from " +
" PatientTable as PatientTable " +
"UNION ALL " +
"select " +
" PatientTable.id, PatientTable.fullName " +
"from " +
" PatientTable as PatientTable";
Query query = entityManager.createQuery(queryString);
query.getResultList().forEach(System.out::println);
完整的错误堆栈
Thu Apr 06 14:34:56 EDT 2017 WARN: Establishing SSL connection without server's identity verification is not recommended. According to MySQL 5.5.45+, 5.6.26+ and 5.7.6+ requirements SSL connection must be established by default if explicit option isn't set. For compliance with existing applications not using SSL the verifyServerCertificate property is set to 'false'. You need either to explicitly disable SSL by setting useSSL=false, or set useSSL=true and provide truststore for server certificate verification.
Exception in thread "main" javax.persistence.PersistenceException: Exception [EclipseLink-4002] (Eclipse Persistence Services - 2.5.2.v20140319-9ad6abd): org.eclipse.persistence.exceptions.DatabaseException
Internal Exception: com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'UNION ALL (SELECT t1.id, t1.fullName FROM PatientTable t1))' at line 1
Error Code: 1064
Call: (SELECT t0.id, t0.fullName FROM PatientTable t0 UNION ALL (SELECT t1.id, t1.fullName FROM PatientTable t1))
Query: ReportQuery(referenceClass=PatientTable sql="(SELECT t0.id, t0.fullName FROM PatientTable t0 UNION ALL (SELECT t1.id, t1.fullName FROM PatientTable t1))")
at org.eclipse.persistence.internal.jpa.QueryImpl.getDetailedException(QueryImpl.java:378)
at org.eclipse.persistence.internal.jpa.QueryImpl.executeReadQuery(QueryImpl.java:260)
at org.eclipse.persistence.internal.jpa.QueryImpl.getResultList(QueryImpl.java:469)
at com.tawaaq.app.data.persistence.query.patient.PatientQuery.main(PatientQuery.java:49)
Caused by: Exception [EclipseLink-4002] (Eclipse Persistence Services - 2.5.2.v20140319-9ad6abd): org.eclipse.persistence.exceptions.DatabaseException
Internal Exception: com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'UNION ALL (SELECT t1.id, t1.fullName FROM PatientTable t1))' at line 1
Error Code: 1064
Call: (SELECT t0.id, t0.fullName FROM PatientTable t0 UNION ALL (SELECT t1.id, t1.fullName FROM PatientTable t1))
Query: ReportQuery(referenceClass=PatientTable sql="(SELECT t0.id, t0.fullName FROM PatientTable t0 UNION ALL (SELECT t1.id, t1.fullName FROM PatientTable t1))")
at org.eclipse.persistence.exceptions.DatabaseException.sqlException(DatabaseException.java:340)
at org.eclipse.persistence.internal.databaseaccess.DatabaseAccessor.basicExecuteCall(DatabaseAccessor.java:682)
at org.eclipse.persistence.internal.databaseaccess.DatabaseAccessor.executeCall(DatabaseAccessor.java:558)
at org.eclipse.persistence.internal.sessions.AbstractSession.basicExecuteCall(AbstractSession.java:2002)
at org.eclipse.persistence.sessions.server.ServerSession.executeCall(ServerSession.java:570)
at org.eclipse.persistence.sessions.server.ClientSession.executeCall(ClientSession.java:250)
at org.eclipse.persistence.internal.queries.DatasourceCallQueryMechanism.executeCall(DatasourceCallQueryMechanism.java:242)
at org.eclipse.persistence.internal.queries.DatasourceCallQueryMechanism.executeCall(DatasourceCallQueryMechanism.java:228)
at org.eclipse.persistence.internal.queries.DatasourceCallQueryMechanism.executeSelectCall(DatasourceCallQueryMechanism.java:299)
at org.eclipse.persistence.internal.queries.DatasourceCallQueryMechanism.selectAllRows(DatasourceCallQueryMechanism.java:694)
at org.eclipse.persistence.internal.queries.ExpressionQueryMechanism.selectAllRowsFromTable(ExpressionQueryMechanism.java:2738)
at org.eclipse.persistence.internal.queries.ExpressionQueryMechanism.selectAllReportQueryRows(ExpressionQueryMechanism.java:2675)
at org.eclipse.persistence.queries.ReportQuery.executeDatabaseQuery(ReportQuery.java:848)
at org.eclipse.persistence.queries.DatabaseQuery.execute(DatabaseQuery.java:899)
at org.eclipse.persistence.queries.ObjectLevelReadQuery.execute(ObjectLevelReadQuery.java:1127)
at org.eclipse.persistence.queries.ReadAllQuery.execute(ReadAllQuery.java:403)
at org.eclipse.persistence.queries.ObjectLevelReadQuery.executeInUnitOfWork(ObjectLevelReadQuery.java:1215)
at org.eclipse.persistence.internal.sessions.UnitOfWorkImpl.internalExecuteQuery(UnitOfWorkImpl.java:2896)
at org.eclipse.persistence.tools.profiler.PerformanceProfiler.profileExecutionOfQuery(PerformanceProfiler.java:426)
at org.eclipse.persistence.internal.sessions.AbstractSession.executeQuery(AbstractSession.java:1802)
at org.eclipse.persistence.internal.sessions.AbstractSession.executeQuery(AbstractSession.java:1786)
at org.eclipse.persistence.internal.sessions.AbstractSession.executeQuery(AbstractSession.java:1751)
at org.eclipse.persistence.internal.jpa.QueryImpl.executeReadQuery(QueryImpl.java:258)
... 2 more
答案 0 :(得分：0)
我只能用Oracle重新创建它，因为我现在还没有MySql实例。
在分配别名时删除as时，它有效。
使用您的示例：
queryString = "" +
"select " +
" PatientTable.id, PatientTable.fullName " +
"from " +
" PatientTable PatientTable " +
"UNION ALL " +
"select " +
" PatientTable.id, PatientTable.fullName " +
"from " +
" PatientTable PatientTable";
顺便说一句，你们正在结合的两个陈述是完全一样的，这是有意的吗？
编辑：Nvm，根据这个帖子，JPA不支持union： Union in JPA query - from the same table
在此主题中描述了一种解决方法： JPQL equivalent of SQL query using unions and selecting constants