validationQuery didn't return a row

弄了一个spring+ibatis的例子，在测试的时候报了下面的错误：

Exception in thread "main" org.springframework.jdbc.UncategorizedSQLException: SqlMapClient operation; uncategorized SQLException for SQL []; SQL state [null]; error code [0];
--- The error occurred in config/sqlmap/user.xml.
--- The error occurred while executing update.
--- Check the INSERT INTO User(UserName,PassWord,Age) VALUES (?, ?, ?); .
--- Check the SQL Statement (preparation failed).
--- Cause: org.apache.commons.dbcp.SQLNestedException: Cannot create PoolableConnectionFactory (validationQuery didn't return a row); nested exception is com.ibatis.common.jdbc.exception.NestedSQLException:
--- The error occurred in config/sqlmap/user.xml.
--- The error occurred while executing update.
--- Check the INSERT INTO User(UserName,PassWord,Age) VALUES (?, ?, ?); .
--- Check the SQL Statement (preparation failed).
--- Cause: org.apache.commons.dbcp.SQLNestedException: Cannot create PoolableConnectionFactory (validationQuery didn't return a row)
at org.springframework.jdbc.support.AbstractFallbackSQLExceptionTranslator.translate(AbstractFallbackSQLExceptionTranslator.java:83)
at org.springframework.jdbc.support.AbstractFallbackSQLExceptionTranslator.translate(AbstractFallbackSQLExceptionTranslator.java:80)
at org.springframework.jdbc.support.AbstractFallbackSQLExceptionTranslator.translate(AbstractFallbackSQLExceptionTranslator.java:80)
at org.springframework.orm.ibatis.SqlMapClientTemplate.execute(SqlMapClientTemplate.java:203)
at org.springframework.orm.ibatis.SqlMapClientTemplate.insert(SqlMapClientTemplate.java:364)
at com.mynote.web.dao.impl.UserDaoImpl.registerUser(UserDaoImpl.java:11)
at com.mynote.web.service.impl.UserServiceImpl.registerUser(UserServiceImpl.java:13)
at com.mynote.web.junit.IbatisDemo.main(IbatisDemo.java:21)
Caused by: com.ibatis.common.jdbc.exception.NestedSQLException:
--- The error occurred in config/sqlmap/user.xml.
--- The error occurred while executing update.
--- Check the INSERT INTO User(UserName,PassWord,Age) VALUES (?, ?, ?); .
--- Check the SQL Statement (preparation failed).
--- Cause: org.apache.commons.dbcp.SQLNestedException: Cannot create PoolableConnectionFactory (validationQuery didn't return a row)
at com.ibatis.sqlmap.engine.mapping.statement.MappedStatement.executeUpdate(MappedStatement.java:107)
at com.ibatis.sqlmap.engine.impl.SqlMapExecutorDelegate.insert(SqlMapExecutorDelegate.java:393)
at com.ibatis.sqlmap.engine.impl.SqlMapSessionImpl.insert(SqlMapSessionImpl.java:82)
at org.springframework.orm.ibatis.SqlMapClientTemplate$8.doInSqlMapClient(SqlMapClientTemplate.java:366)
at org.springframework.orm.ibatis.SqlMapClientTemplate.execute(SqlMapClientTemplate.java:200)
... 4 more
Caused by: org.apache.commons.dbcp.SQLNestedException: Cannot create PoolableConnectionFactory (validationQuery didn't return a row)
at org.apache.commons.dbcp.BasicDataSource.createPoolableConnectionFactory(BasicDataSource.java:1549)
at org.apache.commons.dbcp.BasicDataSource.createDataSource(BasicDataSource.java:1388)
at org.apache.commons.dbcp.BasicDataSource.getConnection(BasicDataSource.java:1044)
at org.springframework.jdbc.datasource.DataSourceUtils.doGetConnection(DataSourceUtils.java:111)
at org.springframework.jdbc.datasource.TransactionAwareDataSourceProxy$TransactionAwareInvocationHandler.invoke(TransactionAwareDataSourceProxy.java:224)
at com.sun.proxy.$Proxy4.prepareStatement(Unknown Source)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at com.ibatis.common.jdbc.logging.ConnectionLogProxy.invoke(ConnectionLogProxy.java:53)
at com.sun.proxy.$Proxy5.prepareStatement(Unknown Source)
at com.ibatis.sqlmap.engine.execution.SqlExecutor.prepareStatement(SqlExecutor.java:497)
at com.ibatis.sqlmap.engine.execution.SqlExecutor.executeUpdate(SqlExecutor.java:75)
at com.ibatis.sqlmap.engine.mapping.statement.MappedStatement.sqlExecuteUpdate(MappedStatement.java:216)
at com.ibatis.sqlmap.engine.mapping.statement.MappedStatement.executeUpdate(MappedStatement.java:94)
... 8 more
Caused by: java.sql.SQLException: validationQuery didn't return a row
at org.apache.commons.dbcp.PoolableConnectionFactory.validateConnection(PoolableConnectionFactory.java:660)
at org.apache.commons.dbcp.BasicDataSource.validateConnectionFactory(BasicDataSource.java:1558)
at org.apache.commons.dbcp.BasicDataSource.createPoolableConnectionFactory(BasicDataSource.java:1545)
... 23 more

折腾了很久，才发现，问题在于我的spring配置里面有下面一条：

validationQuery是用于验证连接是否成功的查询SQL语句，但是当数据库表中没有数据时，就会出现异常。

我的User表是空的，没有默认数据，所以运行时就出错了。如果在表中插入一条记录，就不会出现上述问题了。

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