ORA-01858: a non-numeric character was found where a numeric was expected

文档解释

ORA-01858: a non-numeric character was found where a numeric was expected

Cause: The input data to be converted using a date format model was incorrect. The input data did not contain a number where a number was required by the format model.

Action: Fix the input data or the date format model to make sure the elements match in number and type. Then retry the operation.

ORA-01858错误表示在要求数字的地方出现非数字。官方解释是,该错误表示引发了一个由ODBC报告的ORA-01858(a non-numeric character was found where a numeric was expected)错误。

该错误的常见案例是,当在Oracle数据库中使用TO_CHAR函数转换一个数字值到字符串值时,会将非数字字符放到想要得到数字的地方。

正常处理该问题的步骤是:

第一步:检查TO_CHAR函数中的格式参数,以确保转换正确;

第二步:检查数据库中值为字符类型的列是否正确提供;

第三步:检查字符串,以查看是否有特殊字符;

第四步:使用TRIM函数去掉无关的多余字符;

第五步:检查语句中是否有非法字符。

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