04-Nov-2015 05:12

Mysql updating timestamp

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Recently, while doing some development work for one of my clients, I was given the requirement to add Created and Modified timestamps to a whole bunch of existing data tables.There comes a time when it is appropriate to update a My SQL table when only a SELECT statement is being executed.You may be tracking the number of reads, or marking a column with the latest TIMESTAMP.Unfortunately, there is no 'UPDATE ON SELECT' property available in My SQL to do this automatically.Instead, one must rely on executing a compound statement.These tables were referenced by hundreds of different My SQL queries, and to complicate matters further, we were in the middle of migrating the code over to a new database library.

I didn’t much fancy rewriting all of the SQL queries, potentially twice, just to add a couple of timestamps, so modifying code wasn’t much of an option.

Thankfully, a couple of My SQL’s internal features came to the rescue.

In my case, my table holds proxy usage information, and it is useful to keep track of when these proxies are used.

To do this, the statement I use to get a proxy is this: There are more complicated ways to do this, but the basis is simple.

You must insert an extra command into your query, and the simplest way is to separate them with a semicolon.

And no, you cannot set up a trigger for select statements.

Profile for mysql updating timestamp:

mysql updating timestamp-46

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