deleteEntry—从数据库表删除条目的函数。
DeleteEntry - a function that removes an entry from the database table.
通过从备份中提取单个表执行恢复，可恢复单个表故障或意外的表删除
Recover from single table failures or accidental table drops by extracting a single table from a backup for restoration
在获取这个序列号和使用它获取薪水之间，另一个线程可能从两个表删除员工信息。
Between obtaining the serial number and using it to obtain the salary, another thread could remove the employee from both tables.
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