在经历了很多麻烦之后，我的 webapp 已经接近最终版本了，但它仍然需要一些东西。
所以我需要使用“复杂”查询来获取一些结果。
此查询需要调用 MySql 例程并且必须返回 Map 而不是 List。
这是查询:
SELECT d.id, contaOccorrenze(d.descrizione, '" + query + "') AS 'occorrenze' FROM Dispensa d WHERE d.tag LIKE '%" + query + "%' OR d.titolo LIKE '%" + query + "%' OR d.descrizione LIKE '%" + query + "%'
其中 query 是我要查找的词，contaOccorrenze 是我需要调用的例程。
这个查询在 Workbench 中运行良好，所以这个查询不是我的问题。
这是我尝试执行查询后出现的堆栈跟踪:
Caused by: java.lang.IllegalArgumentException: An exception occurred while creating a query in EntityManager:
Exception Description: Syntax error parsing the query [SELECT d.id, contaOccorrenze(d.descrizione, 'lunga') AS 'occorrenze' FROM Dispensa d WHERE d.tag LIKE '%lunga%' OR d.titolo LIKE '%lunga%' OR d.descrizione LIKE '%lunga%'], line 1, column 28: unexpected token [(].
Internal Exception: NoViableAltException(83@[()* loopback of 383:9: (d= DOT right= attribute )*])
at org.eclipse.persistence.internal.jpa.EntityManagerImpl.createQuery(EntityManagerImpl.java:1477)
at com.sun.enterprise.container.common.impl.EntityManagerWrapper.createQuery(EntityManagerWrapper.java:436)
at facade.DispensaFacade.findLikeComplex(DispensaFacade.java:101)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:601)
at org.glassfish.ejb.security.application.EJBSecurityManager.runMethod(EJBSecurityManager.java:1052)
at org.glassfish.ejb.security.application.EJBSecurityManager.invoke(EJBSecurityManager.java:1124)
at com.sun.ejb.containers.BaseContainer.invokeBeanMethod(BaseContainer.java:5388)
at com.sun.ejb.EjbInvocation.invokeBeanMethod(EjbInvocation.java:619)
at com.sun.ejb.containers.interceptors.AroundInvokeChainImpl.invokeNext(InterceptorManager.java:800)
at com.sun.ejb.EjbInvocation.proceed(EjbInvocation.java:571)
at com.sun.ejb.containers.interceptors.SystemInterceptorProxy.doAround(SystemInterceptorProxy.java:162)
at com.sun.ejb.containers.interceptors.SystemInterceptorProxy.aroundInvoke(SystemInterceptorProxy.java:144)
at sun.reflect.GeneratedMethodAccessor80.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:601)
at com.sun.ejb.containers.interceptors.AroundInvokeInterceptor.intercept(InterceptorManager.java:861)
at com.sun.ejb.containers.interceptors.AroundInvokeChainImpl.invokeNext(InterceptorManager.java:800)
at com.sun.ejb.containers.interceptors.InterceptorManager.intercept(InterceptorManager.java:370)
at com.sun.ejb.containers.BaseContainer.__intercept(BaseContainer.java:5360)
at com.sun.ejb.containers.BaseContainer.intercept(BaseContainer.java:5348)
at com.sun.ejb.containers.EJBLocalObjectInvocationHandler.invoke(EJBLocalObjectInvocationHandler.java:214)
... 77 more
Caused by: Exception [EclipseLink-8025] (Eclipse Persistence Services - 2.3.2.v20111125-r10461): org.eclipse.persistence.exceptions.JPQLException
Exception Description: Syntax error parsing the query [SELECT d.id, contaOccorrenze(d.descrizione, 'lunga') AS 'occorrenze' FROM Dispensa d WHERE d.tag LIKE '%lunga%' OR d.titolo LIKE '%lunga%' OR d.descrizione LIKE '%lunga%'], line 1, column 28: unexpected token [(].
Internal Exception: NoViableAltException(83@[()* loopback of 383:9: (d= DOT right= attribute )*])
at org.eclipse.persistence.exceptions.JPQLException.unexpectedToken(JPQLException.java:372)
at org.eclipse.persistence.internal.jpa.parsing.jpql.JPQLParser.handleRecognitionException(JPQLParser.java:320)
at org.eclipse.persistence.internal.jpa.parsing.jpql.JPQLParser.addError(JPQLParser.java:246)
at org.eclipse.persistence.internal.jpa.parsing.jpql.JPQLParser.reportError(JPQLParser.java:363)
at org.eclipse.persistence.internal.jpa.parsing.jpql.antlr.JPQLParser.pathExprOrVariableAccess(JPQLParser.java:1436)
at org.eclipse.persistence.internal.jpa.parsing.jpql.antlr.JPQLParser.arithmeticPrimary(JPQLParser.java:4720)
at org.eclipse.persistence.internal.jpa.parsing.jpql.antlr.JPQLParser.arithmeticFactor(JPQLParser.java:4660)
at org.eclipse.persistence.internal.jpa.parsing.jpql.antlr.JPQLParser.arithmeticTerm(JPQLParser.java:4546)
at org.eclipse.persistence.internal.jpa.parsing.jpql.antlr.JPQLParser.simpleArithmeticExpression(JPQLParser.java:4462)
at org.eclipse.persistence.internal.jpa.parsing.jpql.antlr.JPQLParser.scalarExpression(JPQLParser.java:4834)
at org.eclipse.persistence.internal.jpa.parsing.jpql.antlr.JPQLParser.selectExpression(JPQLParser.java:1269)
at org.eclipse.persistence.internal.jpa.parsing.jpql.antlr.JPQLParser.selectItem(JPQLParser.java:1169)
at org.eclipse.persistence.internal.jpa.parsing.jpql.antlr.JPQLParser.selectClause(JPQLParser.java:1108)
at org.eclipse.persistence.internal.jpa.parsing.jpql.antlr.JPQLParser.selectStatement(JPQLParser.java:359)
at org.eclipse.persistence.internal.jpa.parsing.jpql.antlr.JPQLParser.document(JPQLParser.java:281)
at org.eclipse.persistence.internal.jpa.parsing.jpql.JPQLParser.parse(JPQLParser.java:134)
at org.eclipse.persistence.internal.jpa.parsing.jpql.JPQLParser.buildParseTree(JPQLParser.java:95)
at org.eclipse.persistence.internal.jpa.EJBQueryImpl.buildEJBQLDatabaseQuery(EJBQueryImpl.java:215)
at org.eclipse.persistence.internal.jpa.EJBQueryImpl.buildEJBQLDatabaseQuery(EJBQueryImpl.java:190)
at org.eclipse.persistence.internal.jpa.EJBQueryImpl.<init>(EJBQueryImpl.java:142)
at org.eclipse.persistence.internal.jpa.EJBQueryImpl.<init>(EJBQueryImpl.java:126)
at org.eclipse.persistence.internal.jpa.EntityManagerImpl.createQuery(EntityManagerImpl.java:1475)
... 100 more
Caused by: NoViableAltException(83@[()* loopback of 383:9: (d= DOT right= attribute )*])
at org.eclipse.persistence.internal.libraries.antlr.runtime.DFA.noViableAlt(DFA.java:159)
at org.eclipse.persistence.internal.libraries.antlr.runtime.DFA.predict(DFA.java:116)
at org.eclipse.persistence.internal.jpa.parsing.jpql.antlr.JPQLParser.pathExprOrVariableAccess(JPQLParser.java:1408)
... 117 more
这是我尝试使用的完整方法(将结果 List 转换为 HashMap 是我发现谷歌搜索的一种方式，但我很确定有更好的方法从我的查询中获取 HashMap)
public HashMap<Integer, Integer> findLikeComplex(String query) {
String SQLquery = "SELECT d.id, contaOccorrenze(d.descrizione, '" + query + "') AS 'occorrenze' FROM Dispensa d WHERE d.tag LIKE '%" + query + "%' OR d.titolo LIKE '%" + query + "%' OR d.descrizione LIKE '%" + query + "%'";
return (HashMap<Integer, Integer>) getEntityManager().createQuery(SQLquery).getResultList();
}
我还想通过将查询的 HashMap 语句更改为 HashMap<Integer, Integer> 来将我的 HashMap<Dispensa, Integer> 从 d.id 更改为 * 。
它会起作用还是我要求太多？
最佳答案
您应该尝试使用 getEntityManager().createNativeQuery()
关于mysql - 使用 EJB 查询调用 MySql 例程/存储过程，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/10472623/