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POWhat's the best way to get a bunch of rows from MySQL if you have an array of integer primary keys?
 

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  1. POWhat's the best way to get a bunch of rows from MySQL if you have an array of integer primary keys?
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    <p>I have a MySQL table with an auto-incremented integer primary key. I want to get a bunch of rows from the table based on an array of integers I have in memory in my program. The array ranges from a handful to about 1000 items.</p> <p>What's the most efficient query syntax to get the rows?</p> <p>I can think of a few:</p> <ol> <li>"SELECT * FROM thetable WHERE id IN (1, 2, 3, 4, 5)" (this is what I do now)</li> <li>"SELECT * FROM thetable where id = 1 OR id = 2 OR id = 3"</li> <li>Multiple queries of the form "SELECT * FROM thetable WHERE id = 1". Probably the most friendly to the query cache, but expensive due to having lots of query parsing.</li> <li>A union, like "SELECT * FROM thetable WHERE id = 1 UNION SELECT * FROM thetable WHERE id = 2 ..." I'm not sure if MySQL caches the results of each query; it's also the most verbose format.</li> </ol> <p>I think using the NoSQL interface in MySQL 5.6+ would be the most efficient way to do this, but I'm not yet up to MySQL 5.6.</p>
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    1. USEvan P.
    1. USEvan P.
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      1. VTUpMod
    1. COOh hey, [I recognize you](http://identi.ca/evan)
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      1. POWhat's the best way to get a bunch of rows from MySQL if you have an array of integer primary keys?
      1. USMichael Berkowski
    2. COIndeed. This is for StatusNet.
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      1. POWhat's the best way to get a bunch of rows from MySQL if you have an array of integer primary keys?
      1. USEvan P.
    3. COProbably worth noting that: 1) I'm making hundreds of these queries per second 2) The same IDs end up in lots of different queries (so, first [1, 2, 3, 4, 5], then [2, 4, 5, 7, 9], then [5, 9, 14, 18, 22]). 3) I have a pluggable caching interface on the front end, so I don't depend on query-cache that much.
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      1. USEvan P.
 

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