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Causes of MySQL Error 2014: Cannot Execute Queries While Other Unbuffered Queries Are Active
MySQL's client protocol restricts executing multiple queries concurrently when the results of a previous query have not been completely retrieved. This limitation arises due to the unbuffered nature of some queries, where rows are incrementally fetched instead of being immediately cached as in buffered queries.
When executing an unbuffered query and attempting to execute another query before retrieving all rows from the first, MySQL returns the error "Cannot execute queries while other unbuffered queries are active."
Emulated Prepared Statements
PDO::ATTR_EMULATE_PREPARES specifies whether prepared statements are emulated or executed as native MySQL prepared statements. If set to false, using unbuffered PHP queries can trigger the error 2014. This is because PHP's internal caching mechanism for query results doesn't handle unbuffered queries properly.
Resolving the Error
There are several ways to resolve this error:
Best Practices
To avoid encountering this error, it's recommended to:
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