Hibernate异常之Integer转float(自动类型转换错误)

错误代码：

 java.lang.ClassCastException: java.lang.Integer cannot be cast to java.lang.Float
     at org.hibernate.type.descriptor.java.FloatTypeDescriptor.unwrap(FloatTypeDescriptor.java:19)
     at org.hibernate.type.descriptor.sql.RealTypeDescriptor$1.doBind(RealTypeDescriptor.java:46)
     at org.hibernate.type.descriptor.sql.BasicBinder.bind(BasicBinder.java:74)
     at org.hibernate.type.AbstractStandardBasicType.nullSafeSet(AbstractStandardBasicType.java:280)
     at org.hibernate.type.AbstractStandardBasicType.nullSafeSet(AbstractStandardBasicType.java:275)
     at org.hibernate.param.PositionalParameterSpecification.bind(PositionalParameterSpecification.java:51)
     at org.hibernate.loader.hql.QueryLoader.bindParameterValues(QueryLoader.java:628)
     at org.hibernate.loader.Loader.prepareQueryStatement(Loader.java:2001)
     at org.hibernate.loader.Loader.executeQueryStatement(Loader.java:1915)
     at org.hibernate.loader.Loader.executeQueryStatement(Loader.java:1893)
     at org.hibernate.loader.Loader.doQuery(Loader.java:938)
     at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:341)
     at org.hibernate.loader.Loader.doList(Loader.java:2692)
     at org.hibernate.loader.Loader.doList(Loader.java:2675)
     at org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2507)
     at org.hibernate.loader.Loader.list(Loader.java:2502)
     at org.hibernate.loader.hql.QueryLoader.list(QueryLoader.java:502)
     at org.hibernate.hql.internal.ast.QueryTranslatorImpl.list(QueryTranslatorImpl.java:392)
     at org.hibernate.engine.query.spi.HQLQueryPlan.performList(HQLQueryPlan.java:216)
     at org.hibernate.internal.SessionImpl.list(SessionImpl.java:1489)
     at org.hibernate.query.internal.AbstractProducedQuery.doList(AbstractProducedQuery.java:1445)
     at org.hibernate.query.internal.AbstractProducedQuery.list(AbstractProducedQuery.java:1414)
     at pw.fengya.test.TestHibernate.testHQL(TestHibernate.java:84)
     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
     at java.lang.reflect.Method.invoke(Method.java:483)
     at org.junit.platform.commons.util.ReflectionUtils.invokeMethod(ReflectionUtils.java:389)
     at org.junit.jupiter.engine.execution.ExecutableInvoker.invoke(ExecutableInvoker.java:115)
     at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.lambda$invokeTestMethod$6(TestMethodTestDescriptor.java:167)
     at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor$$Lambda$201/1771687225.execute(Unknown Source)
     at org.junit.jupiter.engine.execution.ThrowableCollector.execute(ThrowableCollector.java:40)
     at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.invokeTestMethod(TestMethodTestDescriptor.java:163)
     at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.execute(TestMethodTestDescriptor.java:110)
     at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.execute(TestMethodTestDescriptor.java:57)
     at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.lambda$execute$3(HierarchicalTestExecutor.java:83)
     at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor$$Lambda$133/1144648478.execute(Unknown Source)
     at org.junit.platform.engine.support.hierarchical.SingleTestExecutor.executeSafely(SingleTestExecutor.java:66)
     at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.execute(HierarchicalTestExecutor.java:77)
     at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.lambda$null$2(HierarchicalTestExecutor.java:92)
     at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor$$Lambda$136/1681595665.accept(Unknown Source)
     at java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:183)
     at java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:175)
     at java.util.Iterator.forEachRemaining(Iterator.java:116)
     at java.util.Spliterators$IteratorSpliterator.forEachRemaining(Spliterators.java:1801)
     at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:512)
     at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:502)
     at java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:150)
     at java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:173)
     at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
     at java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:418)
     at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.lambda$execute$3(HierarchicalTestExecutor.java:92)
     at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor$$Lambda$133/1144648478.execute(Unknown Source)
     at org.junit.platform.engine.support.hierarchical.SingleTestExecutor.executeSafely(SingleTestExecutor.java:66)
     at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.execute(HierarchicalTestExecutor.java:77)
     at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.lambda$null$2(HierarchicalTestExecutor.java:92)
     at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor$$Lambda$136/1681595665.accept(Unknown Source)
     at java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:183)
     at java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:175)
     at java.util.Iterator.forEachRemaining(Iterator.java:116)
     at java.util.Spliterators$IteratorSpliterator.forEachRemaining(Spliterators.java:1801)
     at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:512)
     at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:502)
     at java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:150)
     at java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:173)
     at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
     at java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:418)
     at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.lambda$execute$3(HierarchicalTestExecutor.java:92)
     at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor$$Lambda$133/1144648478.execute(Unknown Source)
     at org.junit.platform.engine.support.hierarchical.SingleTestExecutor.executeSafely(SingleTestExecutor.java:66)
     at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.execute(HierarchicalTestExecutor.java:77)
     at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.execute(HierarchicalTestExecutor.java:51)
     at org.junit.platform.engine.support.hierarchical.HierarchicalTestEngine.execute(HierarchicalTestEngine.java:43)
     at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:170)
     at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:154)
     at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:90)
     at org.eclipse.jdt.internal.junit5.runner.JUnit5TestReference.run(JUnit5TestReference.java:86)
     at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
     at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:538)
     at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:760)
     at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:460)
     at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:206)

根据首行的异常信息可以得出，这个错误是由int转float类型错误，我的查询HQL语句如下：

 void testHQL() {
         String hql = "FROM Employee e where e.salary > ? AND e.dept = ? AND e.email like ?";
         Query<Employee> query = session.createQuery(hql);

         Deptartment dept = new Deptartment();
         dept.setId(5);
         //动态绑定参数
         query.setParameter(0, 6000)
              .setParameter(1, dept)
              .setParameter(2,"%a%");

         List<Employee> emps = query.list();
         System.out.println(emps.size());
     } 

后来经过查找，发现salary是float类型，直接传入一个int整型参数，无法自动转换成float类型，可以先将int型参数转换为String 类型，再转换为float类型：

 void testHQL() {
         String hql = "FROM Employee e where e.salary > ? AND e.dept = ? AND e.email like ?";
         Query<Employee> query = session.createQuery(hql);

         Deptartment dept = new Deptartment();
         dept.setId(5);
         //动态绑定参数
         query.setParameter(0, Float.valueOf(6000))
              .setParameter(1, dept)
              .setParameter(2,"%a%");

         List<Employee> emps = query.list();
         System.out.println(emps.size());
     }