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Is there a java equivalent of Mysql's "multiple-statement-queries" – Facebook api

So basically, I would like to avoid stored procedures, but at the same time I would’nt want multiple round-trips to database to execute sequential statements.

Apparently this blog says Facebook uses mysql’s multiple-statement-queries. Unfortunately, its a C API, is there a java equivalent of it?

So in brief, the question “is in java+mysql how can a second jdbc statement use the output of the first statement as input to execute, without a round-trip to database and without a storedproc” ?

If not how do other people approach this problem?

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Answers


  1. 0

    It sounds like you want to do batch processing.
    here is a duplicate question with an good answer:
    How to execute multiple SQL statements from java

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  2. 0

    Yes, the JDBC driver for MySQL support the multi-statement queries. It is however disabled by default for security reasons, as multi-statement queries significantly increase the risks associated with eventual SQL injections.

    To turn on multi-statement queries support, simply add the allowMultiQueries=true option to your connection string (or pass the equivalent option in map format). You can get more information on that option here: https://dev.mysql.com/doc/connector-j/5.1/en/connector-j-reference-configuration-properties.html.

    Once this option enabled, you can simply execute a call similar to: statement.execute("select ... ; select ... ; select ..."). Returned ResultSets can be iterated from the Statement object: each call to statement.getResultSet() return the next one. Use statement.getMoreResults() to determine if there are indeed more ResultSet available.

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