Warning: Attempt to read property "num_rows" on bool in D:\Web\mysql.php on line 37

这个错误提示意味着在 D:\Web\mysql.php 文件的第 37 行尝试读取一个布尔类型的属性 "num_rows"，但是该属性不存在。这可能是由于 SQL 查询出错或者查询结果为空导致的。建议检查 SQL 查询语句是否正确，以及查询结果是否为空。

相关问题

23/06/07 17:19:28 INFO mapreduce.Job: Task Id : attempt_1686128528321_0001_m_000016_2, Status : FAILED AttemptID:attempt_1686128528321_0001_m_000016_2 Timed out after 300 secs 23/06/07 17:19:28 INFO mapreduce.Job: Task Id : attempt_1686128528321_0001_m_000014_2, Status : FAILED AttemptID:attempt_1686128528321_0001_m_000014_2 Timed out after 300 secs

这些错误消息看起来是在执行MapReduce作业时发生的。它们指示两个任务（ID为attempt_1686128528321_0001_m_000016_2和attempt_1686128528321_0001_m_000014_2）已经超时，因此失败了。可能是因为这些任务需要更长的时间来完成，但是由于超时限制，它们被强制终止了。要解决这个问题，您可以尝试增加超时限制或优化作业以减少任务执行时间。

FATAL: `thread_run' function failed: ./tpcc_run.lua:115: attempt to perform arithmetic on local 'd_next_o_id' (a nil value) (last message repeated 2 times) FATAL: `thread_run' function failed: ./tpcc_run.lua:353: attempt to perform arithmetic on a nil value ALERT: attempt to fetch row from an empty result set FATAL: `thread_run' function failed: ./tpcc_run.lua:325: attempt to index global 'row' (a nil value) FATAL: `thread_run' function failed: ./tpcc_run.lua:115: attempt to perform arithmetic on local 'd_next_o_id' (a nil value) FATAL: `thread_run' function failed: ./tpcc_run.lua:353: attempt to perform arithmetic on a nil value ALERT: attempt to fetch row from an empty result set FATAL: `thread_run' function failed: ./tpcc_run.lua:353: attempt to perform arithmetic on a nil value FATAL: `thread_run' function failed: ./tpcc_run.lua:325: attempt to index global 'row' (a nil value) ALERT: attempt to fetch row from an empty result set FATAL: `thread_run' function failed: ./tpcc_run.lua:325: attempt to index global 'row' (a nil value) FATAL: `thread_run' function failed: ./tpcc_run.lua:353: attempt to perform arithmetic on a nil value ALERT: attempt to fetch row from an empty result set FATAL: `thread_run' function failed: ./tpcc_run.lua:325: attempt to index global 'row' (a nil value)怎么解决

这段错误信息看起来是来自一个名为 tpcc_run.lua 的 Lua 脚本。其中的错误包括尝试在一个空值上进行算术运算，尝试从一个空结果集中获取行等等。要解决这些错误，你需要检查代码并确定哪些变量或值为空或未定义，然后进行必要的检查和处理。这可能需要对代码进行逐行分析和调试，以确定问题的确切原因。建议你仔细检查代码并使用调试器或其他工具来帮助你找到问题所在。