I have this page which mysql_num_rows return 0 and it shouldn't. (Like in Fringe, the TV series). To retrieve the number of rows affected by a INSERT, UPDATE, REPLACE or DELETE query, use mysql_affected_rows. return 0;}} Thanks in advance Mark ***** This e-mail is intended for the recipient only and ... 18. kesäkuuta 2002 15:00 To: php-general@lists.php.net Subject: [PHP] mysql_num_rows always returns 1? If you issue "SELECT FOUND_ROWS()" just in sequence, in the same connection resource, it allways returns 0 rather than expected 5. your coworkers to find and share information. and mysql_num_rows returns 2. But FOUND_ROWS() returns 0 if the previous query was optimized to a NULL join type because of an impossible where. By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy. Nie ma to jak, to ze ktos sobie zobaczy jakas funkcje, na dodatek tylko sam jej koniec (konkretnie return 0) i wyrabuje penerskie pytanie, zamiast: 1. In this particular case, there is one match (I tested the query directly in phpMyAdmin and it returns one match.) To learn more, see our tips on writing great answers. I am using the number of rows to format the html that follows, so it is important that the number be correct. I don't understand why. rev 2020.12.18.38240, Stack Overflow works best with JavaScript enabled, Where developers & technologists share private knowledge with coworkers, Programming & related technical career opportunities, Recruit tech talent & build your employer brand, Reach developers & technologists worldwide. I don't understand what's wrong with it! Description. This always returns 0, and I doubt this's a type cast problem. If no rows match the given criteria then it returns false instead. If you use mysqli_stmt_store_result(), mysqli_stmt_num_rows() may be called immediately. Clustered Index fragmentation vs Index with Included columns fragmentation. site design / logo © 2020 Stack Exchange Inc; user contributions licensed under cc by-sa. Specifies a result set identifier returned by mysqli_query(), mysqli_store_result() or mysqli_use_result() Technical Details. Thanks for contributing an answer to Stack Overflow! Why are most discovered exoplanets heavier than Earth? Mała rzecz, a cieszy. Use store_result method with "num_rows", "bind_result" and "fetch". Is there a monster that has resistance to magical attacks on top of immunity against nonmagical attacks? Copy and paste value from a feature sharing the same id, Looking for name of (short) story of clone stranded on a planet. It is a result set identifier returned by mysqli_query(), mysqli_store_result() or mysqli_use_result() Example. Did the actors in All Creatures Great and Small actually have their hands in the animals? num_rows is a property of mysqli_stmt, not of a result resource. Hello, i am using mysql_num_rows to find the number of rows in a result set, but when there are now rows in the resultset, then , instead of returning zero, the program is halting. So, double check your code. Databases are often used to answer the question, “ How often does a certain type of data occur in a table? Differences between Mage Hand, Unseen Servant and Find Familiar. Nauczyc sie c++ 2. Asking for help, clarification, or responding to other answers. To get the number of rows stored there use $stmt->num_rows. Both of these methods fetch the results. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Note : mysql_* function is deprecated, move on mysqli_* function asap. Making statements based on opinion; back them up with references or personal experience. [mysql_num_rows returns 0 instead of actual value] View as plain text >Description: i have a sample program from the o'reilly book mysql and msql and when i try to run this program the mysql_num_rows returns '0' results rows even though there are 2 rows in the result set. Nope I cannot see any other update. Hi,Aaron, thank u for your help,but it is not a problem on table name,every thing is OK(I did a lot experiment),I want to input a sql statement from a form,and let the PHP do the query and generate the data listing.I input some sql like inserting and alter table,all works well.but when I select something,the fieldnum is allways 1,and when I want to repeat by: Here is the query: I open the .php file and run the query and it returns empty values, like this: I also tried to echo the value that returns and is, guess what? Sr.No Parameters & Description; 1: result. Here’s an example of using the COUNT()function to return the total number of rows in a table: Result: This returns the number of rows in the table because we didn’t provide any criteria to narrow the results down. Stack Overflow for Teams is a private, secure spot for you and Those extra quotation marks are not a must and your query will produce 100% same result as their query did. Once the results are fetched from MySQL, they cannot be fetched again. What is different in this query, functionally, from OP's query except back ticks? When I run this simple query, it mysql_num_rows return 0, instead of 1. Yes, I'm using that domain to send the values in the login form. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. No coz moze powtorze, return 0 znaczy" "zwroc 0" po wykonaniu funkcji - co wydaje mi sie te oczywiste, a pytanie smieszne. So you should be doing: $result = $stmt->get_result(); // Also check strict comparison against int 0, // to avoid incorrect equality with boolean FALSE if($stmt->num_rows === 0) { echo 'No rows found'; } share. get_result() fetches the results and saves them in a separate object. Where as in reality, the query returns 5 records, and I get it via mysql_fetch_row. Here is what I want to make, is a login in jQuery Mobile, but it doesn't work! If 1 or more rows exist, it always returns 1 more than the number of rows that exist. Interpolation works fine in double quotes. V-brake pads make contact but don't apply pressure to wheel, Why write "does" instead of "is" "What time does/is the pharmacy open?". Can anyone identify this biplane from a TV show? I tried using this function directly, and with explicit type cast -- (unsigned long) mysql_num_rows(res) unsigned long no_rows = mysql_num_rows ( tbl_content ); But no matter what I do, it's always 0. The mysqli_num_rows() function returns the number of rows in a result set. rev 2020.12.18.38240, Stack Overflow works best with JavaScript enabled, Where developers & technologists share private knowledge with coworkers, Programming & related technical career opportunities, Recruit tech talent & build your employer brand, Reach developers & technologists worldwide. Hi Everyone, I am having some problems with mysql_num_rows. @kush.impetus Then your query failed, and, @kush.impetus you are right. Returns the number of rows in the result set. In your case you first stored the results in mysqli_stmt and then fetched an empty result set into $result. I have this strange problem with mySQL and PHP. As expected, running the query directly gives the desired result. How to prevent the water from hitting me while sitting on toilet? Consider there is a table named geek in a MySQL database named Geeks. It returns the number of rows in a result set. The variables are empty in the query, and I'm sending the correct fields and the jQuery application always send me to the "Incorrect information" dialog! Alternatives to this function include: mysqli_num_fields() PDOStatement::columnCount() Php / MYSQL problems. Making statements based on opinion; back them up with references or personal experience. mysql_num_rows returns 0 for HANDLER statement. Syntax. Where as in reality, the query returns 5 records, and I get it via mysql_fetch_row. how to count multiple arrays returned from query, php script echoing part of the php instead of what intended, mysqli prepared statement , how to loop the result set, prepared statement mysqli not returning rows, PHP Fatal error: Call to a member function bind_param() on a non-object, PHP no error detected but not showing properly, MySQLI Prepared Statement: num_rows & fetch_assoc. @Hanky웃Panky did you checked my whole query? Here is the To learn more, see our tips on writing great answers. You can still use the "num_rows" property in the income get_result method as shown below. sometime without double quotes php variable remains same (0). Try out the following example Stack Overflow for Teams is a private, secure spot for you and Zero! I have read in another threads that pasting the query in phpMyAdmin returns the amount of rows that you have, but in my case it doesn't even returns a value in phpMyAdmin, it's always 0! Your POST values are not there, simple as that. This extension was deprecated in PHP 5.5.0, and it was removed in PHP 7.0.0. This page has moved or been replaced. See also MySQL: choosing an API guide and related FAQ for more information. Nauczyc sie analizowac kod zrodlowy. Return Value: It returns the number of rows present in a result set. Share a … you can't see any other update? How to prevent the water from hitting me while sitting on toilet? By using our site, you acknowledge that you have read and understand our Cookie Policy, Privacy Policy, and our Terms of Service. Have your code echo back the form inputs when the page first loads and look for anything peculiar. How to read voice clips off a glass plate? Why does the EU-UK trade deal have the 7-bit ASCII table as an appendix? Posted by: Steven Palm Date: January 07, 2005 12:06AM Running 4.1.8 on MacOS X, and trying to debug a problem in a program I'm working with. It is difficult to use. Can you post your database structure with data? Please help! You either need to do, in2.php.net/manual/en/mysqli-result.num-rows.php, Podcast Episode 299: It’s hard to get hacked worse than this, PHP statement with mysqli_fetch_assoc not working. 0. num_rows is a property of mysqli_stmt, not of a result resource. Can one reuse positive referee reports if paper ends up being rejected? Parameter Description; result: Required. Object oriented style int mysqli_result->num_rows ; Procedural style int mysqli_num_rows (mysqli_result result); Returns the number of rows in the result set. how is this supposed to solve it? Did I shock myself? Ideal way to deactivate a Sun Gun when not in use? @Michael: I read it in documentation on php.net. Use mysqli or PDO statements, as mysql is deprecated. Did the actors in All Creatures Great and Small actually have their hands in the animals? Returns the number of rows in the result set. The tricky part is that even when the sql query contains a COUNT() statement, it is still a query result like any other. Just switch mysql.trace_mode to Off and things will work. The use of mysqli_stmt_num_rows() depends on whether or not you used mysqli_stmt_store_result() to buffer the entire result set in the statement handle.. I have the following code and it returns the incorrect number of rows. Yes so that means check your FORM that posts to this PHP, your PHP is fine. You need to check the number of affected rows, instead of the number of rows.The num_rows constant is the number of selected rows, while the affected_rows constant is for for insert, update and delete queries.. You also should use a prepared statement instead of injecting variables directly in the query. Their problem is that those variables do not hold a value. Archived. My bottle of water accidentally fell and dropped some pieces. I have read in another threads that pasting the query in phpMyAdmin returns the amount of rows that you have, but in my case it doesn't even returns a value in phpMyAdmin, it's always 0! Are you sure the resulting SQL is correct and it is being pd and prepared without errors? Is it wise to keep some savings in a cash account to protect against a long term market crash? For get_result method, use "affected_rows" and "fetch_array". It was working but now it simply isn't anymore and it's always returning 0. Right it's not a problem with the mysql_num_rows function as I thought it was as my query for testing if a username already exists while registering doesn't work either so it has to be a problem with the database. Try this: And also your condition is incorrect.It should be like this: Also this type of problem occurre when $_POST variable is empty.. Instead, the MySQLi or PDO_MySQL extension should be used. From a comment on PHP manual documentation: If you do not use mysqli_stmt_store_result(), and immediately call this function after executing a prepared statement, this function will usually return 0 as it has no way to know how many rows are in the result set as the result set is not saved in memory yet. Here is the problem: If 0 rows exist mysql sometimes returns 0 and sometimes returns 1. Also, sql injection .. blah blah blah. Why removing noise increases my audio file size? The function below works when I pass in a valid username and password and returns '1'. By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy. mysql_num_rows() on the other hand, just counts the number of rows in the result of the query that was actually executed. that depends on the structure of code. int|false mysql_num_rows (resource result); Retrieves the number of rows from a result set. Should you post basic computer science homework to your github? Object oriented style int mysqli_result->num_rows ; Procedural style int mysqli_num_rows (mysqli_result result); Returns the number of rows in the result set. mysql_num_rows() returns 1 as expected. The problem is that you used two methods which are in conflict with each other. and mysql_num_rows returns 2. By otuatail, May 18, 2011 in PHP Coding Help I mean to ask whether your login form also resides on android.neosoftware.org.mx ? Description. For unbuffered result sets, mysqli_num_rows() will not return the correct number of rows until all the rows in the result have been retrieved. Can archers bypass partial cover by arcing their shot? How do politicians scrutinize bills that are thousands of pages long? Parameters. It returns the number of rows in a result set. Are you aware that you cannot ordinarily send values using AJAX to a different domain? Why does the EU-UK trade deal have the 7-bit ASCII table as an appendix? I would advise to avoid this method whenever possible. Use only one of these methods at a time. Both mysqli_stmt and mysqli_result classes have the num_rows property. Why are many obviously pointless papers published, or worse studied? The key is to use the appropriate one. I didn't write the program, just trying to figure out why it's not working for me but is working for them, either a 4.0 or 3.x series MySQL installation. Here is the complete .php file (is for a login): Hope someone can help me figure out where I have gone wrong? Would a lobby-like system of self-governing work? store_result() fetches the results internally and stores them in the statement object. Parameters Asking for help, clarification, or responding to other answers. Do damage to electrical wiring? This doesn't work. Why shouldn't I use mysql_* functions in PHP? How to convert specific text from a list into uppercase? This topic is now archived and is closed to further replies. Return Values. If MySQL is returning 0 rows, then there must be something different in the form submitted to make the query. The code always echoes No rows found. How to split equation into a table and under square root? In this particular case, there is one match (I tested the query directly in phpMyAdmin and it returns one match.) autor: Piotr Kuźmiński, ostatnia modyfikacja: 2008-01-04. szukaj: mysql_num_rows kurs mysql Podczas poprzedniej części naszego kursu nauczyliście się wybierać dokładniej interesujące nas rekordy (precyzowanie wielokrotnych warunków) - do tego przydałoby się jeszcze określenie ile wierszy zostało wybranych przez dane zapytanie. mysql_num_rows() returns error on zero rows. site design / logo © 2020 Stack Exchange Inc; user contributions licensed under cc by-sa. I tried using this function directly, and with explicit type cast -- (unsigned long) mysql_num_rows(res) unsigned long no_rows = mysql_num_rows ( tbl_content ); But no matter what I do, it's always 0. and what are the values of your usu and pass javascript variables? Description: FOUND_ROWS() should return 1 after any simple query that does SELECT COUNT(*) with no GROUP BY. If I take this query and run it on the db, it returns one row, but if I run it in my script and call mysql_num_rows it always shows 0. The behaviour of mysqli_num_rows depends on whether buffered or unbuffered result sets are being used. The behaviour of mysqli_num_rows depends on whether buffered or unbuffered result sets are being used. your coworkers to find and share information. So you should be doing: Don't use store_result and get_result together in the same statement. Thanks for contributing an answer to Stack Overflow! Why is there a 'p' in "assumption" but not in "assume? The new page is located here: https://dev.mysql.com/doc/c-api/8.0/en/mysql-num-rows.html. This always returns 0, and I doubt this's a type cast problem. It didn't work, any other idea of what it could be? What are the values $referenceid and $enteredvalue? mysqli_num_rows(result); Parameter Values. $result will contain 0 rows, because all of the records have already been stored in the statement. MySQL will return a row containg a single column with the number of rows that would have been returned, should you have issued a reglar query. ” For example, you might want to know how many pets you have, or how many pets each owner has, or you might want to perform various kinds of census operations on your animals. 3. Is there any theoretical problem powering the fan with an electric motor. Hi.. What is the output of. mysql_num_rows() returns 0, Creating login page with a student ID mysql and php, Don't understand how Plato's State is ideal. This command is only valid for statements like SELECT or SHOW that return an actual result set. Now what? Below is the description of the table geek. By using our site, you acknowledge that you have read and understand our Cookie Policy, Privacy Policy, and our Terms of Service. I faced this many times, and sometime it works.. :), Podcast Episode 299: It’s hard to get hacked worse than this, mysql_fetch_array()/mysql_fetch_assoc()/mysql_fetch_row()/mysql_num_rows etc… expects parameter 1 to be resource, Problem with $_POST, if isset() and mysql_fetch_assoc(): echo returns correct value, page source always returns else value, PHP5 $_SESSION not working while register_globals is off. After Mar-Vell was murdered, how come the Tesseract got transported back to her secret laboratory? What mammal most abhors physical violence? The behaviour of mysqli_num_rows() depends on whether buffered or unbuffered result sets are being used. That is, the SELECT COUNT(*) returns 1 row, whether the query matched any rows or not. A day or two before, it was working fine. Can one reuse positive referee reports if paper ends up being rejected? Maybe it could be because of my javascript? !
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