如何总是遇见这类function query() function fetch_array()这类异常呢

后端开发|php教程

nbsp,tabledump,zangbao,GLOBALS,size

后端开发-php教程

怎么总是遇见这类function query(),function fetch_array()这类错误呢

/**

* 生成数据库备份文件

*/

function sql_dumptable($table, $vol_size, $startfrom = 0, $currsize = 0)

{

global $startrow;

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$allow_max_size = intval(@ ini_get(‘upload_max_filesize’)); //单位M

if ($allow_max_size > 0 && $vol_size > ($allow_max_size * 1024))

{

$vol_size = $allow_max_size * 1024; //单位K

}

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if ($vol_size > 0)

{

$vol_size = $vol_size * 1024;

}

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if (!isset ($tabledump))

{

$tabledump = ”;

}

$offset = 100;

if (!$startfrom)

{

$tabledump = “DROP TABLE IF EXISTS $table;\n”;

$sql=”SHOW CREATE TABLE “.$table.””;

$createtable = $GLOBALS[‘zangbao’]->query($sql); $create = $GLOBALS[‘zangbao’]->fetch_array($createtable);

$tabledump .= $create[1] . “;\n\n”;

if ($GLOBALS[‘zangbao’]->version() > ‘4.1’ && $this->sqlcharset)

{

$tabledump = preg_replace(“/(DEFAULT)*\s*CHARSET=[a-zA-Z0-9]+/”, “DEFAULT CHARSET=” . $this->sqlcharset, $tabledump);

}

}

$tabledumped = 0;

$numrows = $offset;

while ($currsize + strlen($tabledump) < $vol_size && $numrows == $offset)

{

$tabledumped = 1;

$rows = $GLOBALS[‘zangbao’]->query(“SELECT * FROM $table LIMIT $startfrom, $offset”);

$numfields = $GLOBALS[‘zangbao’]->num_fields($rows);

$numrows = $GLOBALS[‘zangbao’]->num_rows($rows);

while ($row = $GLOBALS[‘zangbao’]->fetch_array($rows))

{

$comma = “”;

$tabledump .= “INSERT INTO $table VALUES(“;

for ($i = 0; $i < $numfields; $i++)

{

$tabledump .= $comma . “‘” . $GLOBALS[‘zangbao’]->escape_string($row[$i]) . “‘”;

$comma = “,”;

}

$tabledump .= “);\n”;

}

$startfrom += $offset;

}

$startrow = $startfrom;

$tabledump .= “\n”;

return $tabledump;

}

Fatal error: Call to a member function query() on a non-object in E:\wamp\www\zangbaoshengwu\admin\include\backup.class.php on line 108

我这是做的数据库备份恢复程序，红色那行和下面的一行总是出错，我已经在类文件里面定义了的

——解决方案——————–

print_r($GLOBALS[‘zangbao’]);

看看！多半不是数据库类的实例

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