Note that this code is using the mysql_* functions which were removed in PHP 7; when considering a replacement, see this interesting conundrum ... ... <看更多>

MySQL upsert 操作. Aug 20 2019 database. upsert 操作是说如果这条记录存在（含有unique key 或primary key 的字段存在）那么就更新，否则就插入一条新的记录。 ... <看更多>

Upsert on MySQL, PostgreSQL, and SQLite3. Transparently creates functions (UDF) for MySQL and PostgreSQL; on SQLite3, uses INSERT OR IGNORE. ... <看更多>

This video is part of CCA 159 Data Analyst course. If you want to sign up for the course in Udemy for $10, please ... ... <看更多>

And from looking at the code, it does not seem possible to me that it will try to insert the same data from 2 different transactions. ... <看更多>