Category Archives: Programming

Material related to computer programming.

MySQL: Error in SQL: Commands out of sync; you can’t run this command now

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Today I was programming MySQL via PHP and I received an error “Error in SQL: Commands out of sync; you can’t run this command now”. It turned out the problem was that a previous mulit_query had mysqli_results that hadn’t been freed. This article helped me solve the problem, and now my batch mode SQL processor looks like this:

  public function execute_batch( $sql ) {

    $this->write_count++;

    if ( ! $this->link->multi_query( $sql ) ) {

      $this->throw_error( $sql );

    }

    if ( $this->link->more_results() ) {

      do {
        $result = $this->link->use_result();
        if ( $result instanceof mysqli_result ) {
          $result->free();
        }
      }
      while ( $this->link->more_results() && $this->link->next_result() );

    }
  }

This code executes the SQL batch and then frees any mysqli_results that result from the query batch.

Enabling Server Side Includes (SSIs)

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I have some old web content that works using Server Side Includes and I needed to get it functional on a new web server. I found this article How do I enable server-side includes (SSIs) on my site? which had everything I needed to know.

First I needed to add the content type and output filter to the Apache configuration:

  AddType text/html .shtml
  AddOutputFilter INCLUDES .shtml

Then I needed to add the IncludesNoExec option:

  Options MultiViews Indexes SymLinksIfOwnerMatch IncludesNoExec

Then I needed to specify the DirectoryIndex:

  DirectoryIndex index.shtml index.html

And that was it!