Java 为什么我在Spring引导应用程序中使用prepared语句执行JdbcTemplate查询时会出现此错误？

我很久没有使用Spring了，现在我发现使用prepared语句执行查询时有一些困难。查询结果是数据库中的一行

我将此方法写入@Repository类：

如您所见，我使用：tagIdentifier参数指定where条件参数，并尝试将其替换为将新对象[]{tagIdentifier}作为方法参数传递的查询方法

但这是行不通的

当我执行单元测试失败时，在stacktrace中，我仅获得以下错误消息：

org.springframework.jdbc.UncategorizedSQLException: PreparedStatementCallback; uncategorized SQLException for SQL [SELECT * FROM Tags WHERE TagIdentifier = :tagIdentifier]; SQL state [null]; error code [0]; Could not set parameter at position 1 (values vas 'Y_KT8_401_ETA_GTCOMP'); nested exception is java.sql.SQLException: Could not set parameter at position 1 (values vas 'Y_KT8_401_ETA_GTCOMP')
    at org.springframework.jdbc.support.AbstractFallbackSQLExceptionTranslator.translate(AbstractFallbackSQLExceptionTranslator.java:90)
    at org.springframework.jdbc.support.AbstractFallbackSQLExceptionTranslator.translate(AbstractFallbackSQLExceptionTranslator.java:82)
    at org.springframework.jdbc.support.AbstractFallbackSQLExceptionTranslator.translate(AbstractFallbackSQLExceptionTranslator.java:82)
    at org.springframework.jdbc.core.JdbcTemplate.execute(JdbcTemplate.java:655)
    at org.springframework.jdbc.core.JdbcTemplate.query(JdbcTemplate.java:690)
    at org.springframework.jdbc.core.JdbcTemplate.query(JdbcTemplate.java:722)
    at org.springframework.jdbc.core.JdbcTemplate.query(JdbcTemplate.java:732)
    at org.springframework.jdbc.core.JdbcTemplate.query(JdbcTemplate.java:782)
    at com.springboot.excelapi.repository.TagRepository.findTagByTagIdentifier(TagRepository.java:32)
    at com.springboot.excelapi.repository.TagRepository$$FastClassBySpringCGLIB$$d21d6de9.invoke(<generated>)
    at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:204)
    at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:738)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:157)
    at org.springframework.dao.support.PersistenceExceptionTranslationInterceptor.invoke(PersistenceExceptionTranslationInterceptor.java:136)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
    at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:673)
    at com.springboot.excelapi.repository.TagRepository$$EnhancerBySpringCGLIB$$f8b080ad.findTagByTagIdentifier(<generated>)
    at com.springboot.excelapi.service.TagService.findTagByTagIdentifier(TagService.java:26)
    at com.springboot.excelapi.integration.ServiceTest.findTagByTagIdentifier(ServiceTest.java:43)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.base/java.lang.reflect.Method.invoke(Method.java:567)
    at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
    at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
    at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
    at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
    at org.springframework.test.context.junit4.statements.RunBeforeTestMethodCallbacks.evaluate(RunBeforeTestMethodCallbacks.java:75)
    at org.springframework.test.context.junit4.statements.RunAfterTestMethodCallbacks.evaluate(RunAfterTestMethodCallbacks.java:86)
    at org.springframework.test.context.junit4.statements.SpringRepeat.evaluate(SpringRepeat.java:84)
    at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
    at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:252)
    at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:94)
    at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
    at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
    at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
    at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
    at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
    at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61)
    at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:70)
    at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
    at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:191)
    at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:89)
    at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:41)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:542)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:770)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:464)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:210)
Caused by: java.sql.SQLException: Could not set parameter at position 1 (values vas 'Y_KT8_401_ETA_GTCOMP')
    at org.mariadb.jdbc.internal.util.ExceptionMapper.getSqlException(ExceptionMapper.java:163)
    at org.mariadb.jdbc.MariaDbClientPreparedStatement.setParameter(MariaDbClientPreparedStatement.java:415)
    at org.mariadb.jdbc.AbstractPrepareStatement.setString(AbstractPrepareStatement.java:1230)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.base/java.lang.reflect.Method.invoke(Method.java:567)
    at org.apache.tomcat.jdbc.pool.StatementFacade$StatementProxy.invoke(StatementFacade.java:114)
    at com.sun.proxy.$Proxy89.setString(Unknown Source)
    at org.springframework.jdbc.core.StatementCreatorUtils.setValue(StatementCreatorUtils.java:453)
    at org.springframework.jdbc.core.StatementCreatorUtils.setParameterValueInternal(StatementCreatorUtils.java:241)
    at org.springframework.jdbc.core.StatementCreatorUtils.setParameterValue(StatementCreatorUtils.java:172)
    at org.springframework.jdbc.core.ArgumentPreparedStatementSetter.doSetValue(ArgumentPreparedStatementSetter.java:66)
    at org.springframework.jdbc.core.ArgumentPreparedStatementSetter.setValues(ArgumentPreparedStatementSetter.java:47)
    at org.springframework.jdbc.core.JdbcTemplate$1.doInPreparedStatement(JdbcTemplate.java:696)
    at org.springframework.jdbc.core.JdbcTemplate.execute(JdbcTemplate.java:639)
    ... 44 more

为了完整性：在同一个类中，我有一个类似的方法执行一个类似的查询，该查询没有where条件，并返回多行，并且运行良好

---

那么，我的代码有什么问题？我错过了什么？如何修复它以正确执行查询？

您正在使用命名SQL查询。您需要传递如下所示的参数：

Map namedParameters = Collections.singletonMap("tagIdentifier", tagIdentifier);

---

这是因为您混合了命名和位置JDBC参数。JdbcTemplate仅支持位置参数

因此，对于JDBCTemplate，可以执行以下操作：

String SELECT_BY_TAG_IDENTIFIER = "SELECT * FROM Tags WHERE TagIdentifier = ?";

TagDTO result = (TagDTO) jdbcTemplate.query(SELECT_BY_TAG_IDENTIFIER, 
                                            new Object[] { tagIdentifier }, 
                                            BeanPropertyRowMapper.newInstance(TagDTO.class));

或者使用NamedJdbcParameterTemplate并执行以下操作：

SqlParameterSource namedParameters = new MapSqlParameterSource().addValue("tagIdentifier", 1);

String SELECT_BY_TAG_IDENTIFIER = "SELECT * FROM Tags WHERE TagIdentifier = :tagIdentifier";

TagDTO result = (TagDTO) namedParamJdbcTemplate.query(SELECT_BY_TAG_IDENTIFIER, 
                                            namedParameters,  BeanPropertyRowMapper.newInstance(TagDTO.class)}, 

---

看起来您正在使用带有命名参数的JdbcTemplate，这是不受支持的。替换：标记标识符到？或者切换到NamedParameterJdbcTemplate

使用命名参数时，必须使用NamedParameterJdbcTemplate而不是JdbcTemplate，如：

或者，您仍然可以将JdbcTemplate与通用占位符一起使用：

---

这不是一条错误消息。这只是一个有用的例子message@jhamon你是对的。我编辑了我的原始帖子，插入了正确的exception@AndreaNobili您目前在项目中使用的是哪个版本的Spring JPA？@SariqShaikh据我所知，JdbcTemplate不应该使用Spring JPA。还是我错了？@AndreaNobili我这么问是因为基于您的查询，您可以直接生成存储库方法，而无需使用jdbctemplate。

SqlParameterSource namedParameters = new MapSqlParameterSource().addValue("tagIdentifier", 1);

String SELECT_BY_TAG_IDENTIFIER = "SELECT * FROM Tags WHERE TagIdentifier = :tagIdentifier";

TagDTO result = (TagDTO) namedParamJdbcTemplate.query(SELECT_BY_TAG_IDENTIFIER, 
                                            namedParameters,  BeanPropertyRowMapper.newInstance(TagDTO.class)}, 

@Override
public TagDTO findTagByTagIdentifier(String tagIdentifier) {
    TagDTO tagDto = new TagDTO();
    String SELECT_BY_TAG_IDENTIFIER = "SELECT * FROM Tags WHERE TagIdentifier = :tagIdentifier";

    SqlParameterSource param = new MapSqlParameterSource("tagIdentifier", tagIdentifier);
    TagDTO result = (TagDTO) namedParameterJdbcTemplate.query(SELECT_BY_TAG_IDENTIFIER, 
                                                param, BeanPropertyRowMapper.newInstance(TagDTO.class));
return tagDto;

String SELECT_BY_TAG_IDENTIFIER = "SELECT * FROM Tags WHERE TagIdentifier = ?";

TagDTO result = (TagDTO) jdbcTemplate.query(SELECT_BY_TAG_IDENTIFIER, 
                                            new Object[] { tagIdentifier }, 
                                            BeanPropertyRowMapper.newInstance(TagDTO.class));