org.springframework.jdbc.IncorrectResultSetColumnCountException:Incorrect column count: expected 1,_incorrect column count: expected 1, actual 16-优快云博客

本文链接：https://blog.youkuaiyun.com/sky892012/article/details/104723737

本文详细解析了在Spring框架中整合C3P0连接池并使用JdbcTemplate进行数据库操作时遇到的IncorrectResultSetColumnCountException异常。通过示例代码展示了如何正确配置RowMapper来解决查询结果与预期不匹配的问题。

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spring使用注解方式整合c3p0连接数据库，然后使用JdbcTemplate查询数据库记录，报错：

org.springframework.jdbc.IncorrectResultSetColumnCountException: Incorrect column count: expected 1, actual 5
	at org.springframework.jdbc.core.SingleColumnRowMapper.mapRow(SingleColumnRowMapper.java:92)
	at org.springframework.jdbc.core.RowMapperResultSetExtractor.extractData(RowMapperResultSetExtractor.java:93)
	at org.springframework.jdbc.core.RowMapperResultSetExtractor.extractData(RowMapperResultSetExtractor.java:60)
	at org.springframework.jdbc.core.JdbcTemplate$1QueryStatementCallback.doInStatement(JdbcTemplate.java:465)
	at org.springframework.jdbc.core.JdbcTemplate.execute(JdbcTemplate.java:407)
	at org.springframework.jdbc.core.JdbcTemplate.query(JdbcTemplate.java:477)
	at org.springframework.jdbc.core.JdbcTemplate.query(JdbcTemplate.java:487)
	at org.springframework.jdbc.core.JdbcTemplate.queryForObject(JdbcTemplate.java:497)
	at org.springframework.jdbc.core.JdbcTemplate.queryForObject(JdbcTemplate.java:503)
	at spring.mybatis.test.MyTest.test01(MyTest.java:25)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
	at java.lang.reflect.Method.invoke(Unknown Source)
	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.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)
	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)
	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.junit.runners.ParentRunner.run(ParentRunner.java:363)
	at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.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:459)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:678)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:382)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:192)

查询的代码是：

String sql="select * from customer where id=1 ";
Person p=(Person) jt.queryForObject(sql,Person.class);

问题原因是查询出来的记录无法跟类的属性对应，需要添加RowMapper

RowMapper<Person> rowMapper=new BeanPropertyRowMapper<>(Person.class);
Person p=(Person) jt.queryForObject(sql,rowMapper);