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我正在使用 ibatis 和 java webapp 插入一行。POJO 有一个字段需要存储一个数字（如 3.0 或 2.34）。我曾尝试在 java 端使用 BigDecimal 和 Double。在 MySQL 方面，我使用的是 Decimal(5, 5) 数据类型。

当我尝试插入具有“4”作为此数字字段值的行时，MySQL 和 iBatis 抛出以下异常：

org.springframework.jdbc.UncategorizedSQLException: SqlMapClient operation: encountered SQLException [  
--- The error occurred in org/mySQL.xml.  
--- The error occurred while applying a result map.  
--- Check the mySQL.insertQuery.  
--- The error happened while setting a property on the result object.  
--- Cause: java.lang.RuntimeException: org.springframework.jdbc.UncategorizedSQLException: SqlMapClient operation: encountered SQLException [  
--- The error occurred while applying a parameter map.  
--- Check the insertQuery-InlineParameterMap.  
--- Check the statement (update failed).  
--- Cause: com.mysql.jdbc.MysqlDataTruncation: Data truncation: Out of range value for column 'numericColumn' at row 316]; nested exception is com.ibatis.common.jdbc.exception.NestedSQLException:   
    at com.ibatis.sqlmap.engine.mapping.statement.GeneralStatement.executeQueryWithCallback(GeneralStatement.java:188)
    at com.ibatis.sqlmap.engine.mapping.statement.GeneralStatement.executeQueryWithRowHandler(GeneralStatement.java:133)
    at com.ibatis.sqlmap.engine.impl.SqlMapExecutorDelegate.queryWithRowHandler(SqlMapExecutorDelegate.java:649)
    at com.ibatis.sqlmap.engine.impl.SqlMapSessionImpl.queryWithRowHandler(SqlMapSessionImpl.java:156)
    at com.ibatis.sqlmap.engine.impl.SqlMapClientImpl.queryWithRowHandler(SqlMapClientImpl.java:133)
    at org.springframework.orm.ibatis.SqlMapClientTemplate$5.doInSqlMapClient(SqlMapClientTemplate.java:267)
    at org.springframework.orm.ibatis.SqlMapClientTemplate.execute(SqlMapClientTemplate.java:165)
    at org.springframework.orm.ibatis.SqlMapClientTemplate.queryWithRowHandler(SqlMapClientTemplate.java:265)
    at org.myClass(myClass.java:83)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:324)
    at org.springframework.util.MethodInvoker.invoke(MethodInvoker.java:248)
    at org.springframework.scheduling.quartz.MethodInvokingJobDetailFactoryBean$MethodInvokingJob.executeInternal(MethodInvokingJobDetailFactoryBean.java:165)
    at org.springframework.scheduling.quartz.QuartzJobBean.execute(QuartzJobBean.java:66)
    at org.quartz.core.JobRunShell.run(JobRunShell.java:191)
    at org.quartz.simpl.SimpleThreadPool$WorkerThread.run(SimpleThreadPool.java:516)

我是否为要插入的值使用了错误的 java 数据类型？如果没有，为什么 MySQL 不让我插入值？

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1 回答 1

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您似乎误解了在 SQL 中定义DECIMAL（或可能NUMERIC）列的工作方式 -
具体而言，将列定义为 时DECIMAL(x, y)，x是该列将存储的总位数，并且y是小数点后的位数。因此，在您的列定义中，您指定了-1 < column < 1的范围。数据类型是正确的，但您尝试指定的值超出了该列被告知允许的范围。幸运的是，修复很简单：更改列定义。我假设您希望在小数点前DECIMAL(10, 5)最多保留 5 位数字，这将使列定义。

于 2012-08-21T15:56:53.873 回答