忽略 - 在PHP

Question

我有這樣一個sql文件中讀取一個SQL文件時，在PHP SQL的評論：

CREATE TABLE IF NOT EXISTS `sessionT` (
    `id` int(9) NOT NULL default '0', 
    `time` varchar(14) NOT NULL default '', 
    `id_session` varchar(200) NOT NULL default '', 
    `token` varchar(200) NOT NULL default '', 
    PRIMARY KEY (`id_session`) 
) ENGINE=InnoDB DEFAULT CHARSET=utf8; 

所以我想呼應所有的SQL語句，但是如果SQL文件有- -評論它不工作

$f = fopen($SQL_FILE,"r+"); 
$sql = fread($f, filesize($SQL_FILE)); 
$sqlArray = explode(';',$sql); 
foreach ($sqlArray as $stmt) { 
    //add logic to ignire -- comments,... 
    if (strlen($stmt)>3 && substr(ltrim($stmt),0,2)!='/*') { 
    echo $stmt; 
    } 
} 

怎麼不理像在文件註釋：

-- -------------------------------------------------------- 
-- comment, relation etc 
-- Estructure . 
CREATE TABLE IF NOT EXISTS `sessionT` (
    `id` int(9) NOT NULL default '0', 
    `time` varchar(14) NOT NULL default '', 
    `id_session` varchar(200) NOT NULL default '', 
    `token` varchar(200) NOT NULL default '', 
    PRIMARY KEY (`id_session`) 
) ENGINE=InnoDB DEFAULT CHARSET=utf8; 

Answer 1

我懷疑的問題是這樣的容易，但也許這將幫助：

if (strlen($stmt)>3 && (substr(ltrim($stmt),0,2)!='/*') || substr(ltrim($stmt),0,3)!='-- ')){ 
echo $stmt; 
} 

Answer 2

從http://www.frihost.com/forums/vt-8194.html溶液）

 


<?php 
ini_set('memory_limit', '5120M'); 
set_time_limit (0); 
/*************************************************************************** 
*        sql_parse.php 
*        ------------------- 
*  begin    : Thu May 31, 2001 
*  copyright   : (C) 2001 The phpBB Group 
*  email    : support@phpbb.com 
* 
*  $Id: sql_parse.php,v 1.8 2002/03/18 23:53:12 psotfx Exp $ 
* 
****************************************************************************/ 

/*************************************************************************** 
* 
* This program is free software; you can redistribute it and/or modify 
* it under the terms of the GNU General Public License as published by 
* the Free Software Foundation; either version 2 of the License, or 
* (at your option) any later version. 
* 
***************************************************************************/ 

/*************************************************************************** 
* 
* These functions are mainly for use in the db_utilities under the admin 
* however in order to make these functions available elsewhere, specifically 
* in the installation phase of phpBB I have seperated out a couple of 
* functions into this file. JLH 
* 
\***************************************************************************/ 

// 
// remove_comments will strip the sql comment lines out of an uploaded sql file 
// specifically for mssql and postgres type files in the install.... 
// 
function remove_comments(&$output) 
{ 
    $lines = explode("\n", $output); 
    $output = ""; 

    // try to keep mem. use down 
    $linecount = count($lines); 

    $in_comment = false; 
    for($i = 0; $i < $linecount; $i++) 
    { 
     if(preg_match("/^\/\*/", preg_quote($lines[$i]))) 
     { 
     $in_comment = true; 
     } 

     if(!$in_comment) 
     { 
     $output .= $lines[$i] . "\n"; 
     } 

     if(preg_match("/\*\/$/", preg_quote($lines[$i]))) 
     { 
     $in_comment = false; 
     } 
    } 

    unset($lines); 
    return $output; 
} 

// 
// remove_remarks will strip the sql comment lines out of an uploaded sql file 
// 
function remove_remarks($sql) 
{ 
    $lines = explode("\n", $sql); 

    // try to keep mem. use down 
    $sql = ""; 

    $linecount = count($lines); 
    $output = ""; 

    for ($i = 0; $i < $linecount; $i++) 
    { 
     if (($i != ($linecount - 1)) || (strlen($lines[$i]) > 0)) 
     { 
     if (isset($lines[$i][0]) && $lines[$i][0] != "#") 
     { 
      $output .= $lines[$i] . "\n"; 
     } 
     else 
     { 
      $output .= "\n"; 
     } 
     // Trading a bit of speed for lower mem. use here. 
     $lines[$i] = ""; 
     } 
    } 

    return $output; 

} 

// 
// split_sql_file will split an uploaded sql file into single sql statements. 
// Note: expects trim() to have already been run on $sql. 
// 
function split_sql_file($sql, $delimiter) 
{ 
    // Split up our string into "possible" SQL statements. 
    $tokens = explode($delimiter, $sql); 

    // try to save mem. 
    $sql = ""; 
    $output = array(); 

    // we don't actually care about the matches preg gives us. 
    $matches = array(); 

    // this is faster than calling count($oktens) every time thru the loop. 
    $token_count = count($tokens); 
    for ($i = 0; $i < $token_count; $i++) 
    { 
     // Don't wanna add an empty string as the last thing in the array. 
     if (($i != ($token_count - 1)) || (strlen($tokens[$i] > 0))) 
     { 
     // This is the total number of single quotes in the token. 
     $total_quotes = preg_match_all("/'/", $tokens[$i], $matches); 
     // Counts single quotes that are preceded by an odd number of backslashes, 
     // which means they're escaped quotes. 
     $escaped_quotes = preg_match_all("/(?<!\\\\)(\\\\\\\\)*\\\\'/", $tokens[$i], $matches); 

     $unescaped_quotes = $total_quotes - $escaped_quotes; 

     // If the number of unescaped quotes is even, then the delimiter did NOT occur inside a string literal. 
     if (($unescaped_quotes % 2) == 0) 
     { 
      // It's a complete sql statement. 
      $output[] = $tokens[$i]; 
      // save memory. 
      $tokens[$i] = ""; 
     } 
     else 
     { 
      // incomplete sql statement. keep adding tokens until we have a complete one. 
      // $temp will hold what we have so far. 
      $temp = $tokens[$i] . $delimiter; 
      // save memory.. 
      $tokens[$i] = ""; 

      // Do we have a complete statement yet? 
      $complete_stmt = false; 

      for ($j = $i + 1; (!$complete_stmt && ($j < $token_count)); $j++) 
      { 
       // This is the total number of single quotes in the token. 
       $total_quotes = preg_match_all("/'/", $tokens[$j], $matches); 
       // Counts single quotes that are preceded by an odd number of backslashes, 
       // which means they're escaped quotes. 
       $escaped_quotes = preg_match_all("/(?<!\\\\)(\\\\\\\\)*\\\\'/", $tokens[$j], $matches); 

       $unescaped_quotes = $total_quotes - $escaped_quotes; 

       if (($unescaped_quotes % 2) == 1) 
       { 
        // odd number of unescaped quotes. In combination with the previous incomplete 
        // statement(s), we now have a complete statement. (2 odds always make an even) 
        $output[] = $temp . $tokens[$j]; 

        // save memory. 
        $tokens[$j] = ""; 
        $temp = ""; 

        // exit the loop. 
        $complete_stmt = true; 
        // make sure the outer loop continues at the right point. 
        $i = $j; 
       } 
       else 
       { 
        // even number of unescaped quotes. We still don't have a complete statement. 
        // (1 odd and 1 even always make an odd) 
        $temp .= $tokens[$j] . $delimiter; 
        // save memory. 
        $tokens[$j] = ""; 
       } 

      } // for.. 
     } // else 
     } 
    } 

    return $output; 
} 

$dbms_schema = 'yourfile.sql'; 

$sql_query = @fread(@fopen($dbms_schema, 'r'), @filesize($dbms_schema)) or die('problem '); 
$sql_query = remove_remarks($sql_query); 
$sql_query = split_sql_file($sql_query, ';'); 

$host = 'localhost'; 
$user = 'user'; 
$pass = 'pass'; 
$db = 'database_name'; 

mysql_connect($host,$user,$pass) or die('error connection'); 
mysql_select_db($db) or die('error database selection'); 

$i=1; 
foreach($sql_query as $sql){ 
echo $i++; 
echo "
"; 
mysql_query($sql) or die('error in query'); 
} 

?>