限制保存到其他表的数据数量

Question

I have to tables :

tb_document           tb_sentence
=================     ===========================================
|doc_id|document|     | id | sentence_id |sentence | doc_id|
=================     ===========================================

I want to take the document data from tb_document . the data is text and then parse the data become sentences. I need to store maximum 50 sentences only for every document in tb_sentence.

here's the code :

foreach ($content as $doc_id => $sentences){ //$content is variable that save document from tb_document
   $i = 0;
   foreach(preg_split('/\\.\\s*/', $sentences) as $current_sentence){
      $q = mysql_query("INSERT INTO tb_sentence SET doc_id = {$doc_id}, sentence_id = {$i}, sentence = '{$current_sentence}'") or die(mysql_error());
      $i<51; $i++;
   }
}

but, it still save whole data. please help me. thank you :)

Answer 1

In your code, you compare $i to 51, but don't do anything with the comparison. Try:

foreach ($content as $doc_id => $sentences){ //$content is variable that save document from tb_document
   $i = 0;
   foreach(preg_split('/\\.\\s*/', $sentences) as $current_sentence){
      $q = mysql_query("INSERT INTO tb_sentence SET doc_id = {$doc_id}, sentence_id = {$i}, sentence = '{$current_sentence}'") or die(mysql_error());

      if(++$i >= 50) 
          break; 
   }
}

The break statement will exit out of the foreach loop.