DLDwintry
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UID 79102
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注册 2006-8-27
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这个错误怎么解决啊，急死了
Fatal error: Call to a member function query() on a non-object in C:\Apache2\htdocs\Guestbook\libs\guestbook.lib.php on line 112
112行为这里： $this->Db->query(
代码为：
class Guestbook {
// database object
var $sql = null;
// smarty template object
var $tpl = null;
// error messages
var $error = null;
/**
* class constructor
*/
function Guestbook() {
// instantiate the sql object
$this->sql =& new GuestBook_SQL;
// instantiate the template object
$this->tpl =& new Guestbook_Smarty;
}
/**
* display the guestbook entry form
*
* @param array $formvars the form variables
*/
function displayForm($formvars = array()) {
// assign the form vars
$this->tpl->assign('post',$formvars);
// assign error message
$this->tpl->assign('error', $this->error);
$this->tpl->display('guestbook_form.tpl');
}
/**
* fix up form data if necessary
*
* @param array $formvars the form variables
*/
function mungeFormData(&$formvars) {
// trim off excess whitespace
$formvars['Name'] = trim($formvars['Name']);
$formvars['Comment'] = trim($formvars['Comment']);
}
/**
* test if form information is valid
*
* @param array $formvars the form variables
*/
function isValidForm($formvars) {
// reset error message
$this->error = null;
// test if "Name" is empty
if(strlen($formvars['Name']) == 0) {
$this->error = 'name_empty';
return false;
}
// test if "Comment" is empty
if(strlen($formvars['Comment']) == 0) {
$this->error = 'comment_empty';
return false;
}
// form passed validation
return true;
}
/**
* add a new guestbook entry
*
* @param array $formvars the form variables
*/
function addEntry($formvars) {
$_query = sprintf(
"insert into GUESTBOOK values(0,'%s',NOW(),'%s')",
mysql_escape_string($formvars['Name']),
mysql_escape_string($formvars['Comment'])
);
return $this->Db->query($_query);
}
/**
* get the guestbook entries
*/
function getEntries() {
$this->Db->query( //就这里出错了！这里是112行！！！！！！！！！！！！！！！！！！！
"select * from GUESTBOOK order by EntryDate DESC",
SQL_ALL,
SQL_ASSOC
);
return $this->Db->fetch;
}
/**
* display the guestbook
*
* @param array $data the guestbook data
*/
function displayBook($data = array()) {
$this->tpl->assign('data', $data);
$this->tpl->display('guestbook.tpl');
}
}
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