mysql - Edit and delete aren't executing in the database in my PHP form -


everything in code seems work fine, except when try edit/delete queried data. i'm new php , mysql please give me advice or direction... trying have run correctly.

php code:

<?php     $servername = "localhost";     $username = tschauss;     $password = "";     $dbname = "tschauss";      // create connection     $db = new mysqli($servername, $username, $password, $dbname);      // check connection     if ($db->connect_error) {         die("connection failed: " . $cdb->connect_error);     }      echo "connected <br>";      $thisphp = $_server['php_self'];      if (!isset($_post['btnedit'])) {         echo <<<eot         <form action="$thisphp" method="post"><br>         employer id: <input type="text" name="eid"><br>         company name: <input type="text" name="compname"><br>         address: <input type="text" name="address"><br>         phone: <input type="text" name="phone"><br>          email: <input type="text" name="email"><br>         position: <input type="text" name="position"> description: <input type="text" name="description">          location: <select name="state" id="state">             <option value="">--</option>             <option value="al">al</option>              <option value="ak">ak</option>              <option value="az">az</option>              <option value="ar">ar</option>              <option value="ca">ca</option>              <option value="co">co</option>              <option value="ct">ct</option>              <option value="de">de</option>              <option value="fl">fl</option>              <option value="ga">ga</option>              <option value="hi">hi</option>              <option value="id">id</option>              <option value="il">il</option>              <option value="in">in</option>              <option value="ia">ia</option>              <option value="ks">ks</option>              <option value="ky">ky</option>              <option value="la">la</option>              <option value="me">me</option>              <option value="md">md</option>              <option value="ma">ma</option>              <option value="mi">mi</option>              <option value="mn">mn</option>              <option value="ms">ms</option>              <option value="mo">mo</option>              <option value="mt">mt</option>              <option value="ne">ne</option>              <option value="nv">nv</option>              <option value="nh">nh</option>              <option value="nj">nj</option>              <option value="nm">nm</option>              <option value="ny">ny</option>              <option value="nc">nc</option>              <option value="nd">nd</option>              <option value="oh">oh</option>              <option value="ok">ok</option>              <option value="or">or</option>              <option value="pa">pa</option>              <option value="ri">ri</option>              <option value="sc">sc</option>              <option value="sd">sd</option>              <option value="tn">tn</option>              <option value="tx">tx</option>              <option value="ut">ut</option>              <option value="vt">vt</option>              <option value="wa">wa</option>              <option value="wv">wv</option>              <option value="wi">wi</option>              <option value="wy">wy</option>              <option value="dc">dc</option>          </select> <br>         skill: <select name="skill1">             <option value="skill1">skill 1</option>             <option value="skill2">skill 2</option>             <option value="skill3">skill 3</option>             </select>         experience: <select name="experience1">             <option value="0">0</option>             <option value="1">1-3</option>             <option value="3">3-5</option>             <option value="5">5-10</option>             <option value="10">10+</option>             </select><br>         skill: <select name="skill2">             <option value="skill1">skill 1</option>             <option value="skill2">skill 2</option>             <option value="skill3">skill 3</option>             </select>         experience: <select name="experience2">             <option value="0">0</option>             <option value="1">1-3</option>             <option value="3">3-5</option>             <option value="5">5-10</option>             <option value="10">10+</option>             </select><br>         skill: <select name="skill3">             <option value="skill1">skill 1</option>             <option value="skill2">skill 2</option>             <option value="skill3">skill 3</option>             </select>         experience: <select name="experience3">             <option value="0">0</option>             <option value="1">1-3</option>             <option value="3">3-5</option>             <option value="5">5-10</option>             <option value="10">10+</option>             </select><br>         need: <input type="radio" name="need" value="urgent" checked> urgent (<1 month) <br>              <input type="radio" name="need" value="soon"> (1-3 months) <br>              <input type="radio" name="need" value="upcoming"> upcoming (3+ month) <br>         <input type="submit" name="btnadd" value="add"> <br>         <hr>         </form>   eot;     }      $eid = $_post["eid"];     $compname = $_post["compname"];     $address = $_post["address"];     $phone = $_post["phone"];     $email = $_post["email"];     $position = $_post["position"];     $description = $_post["description"];     $location = $_post["state"];     $skill1 = $_post["skill1"];     $experience1 = $_post["experience1"];     $skill2 = $_post["skill2"];     $experience2 = $_post["experience2"];     $skill3 = $_post["skill3"];     $experience3 = $_post["experience3"];     $need = $_post["need"];      if (isset($_post['btnadd'])){         if (!empty($eid)){             // form sql string             $location = $_post["state"];             $sql = "insert employer (employerid, compname, address, phone, email, postitle, description, location, skill1, experience1, skill2, experience2, skill3, experience3, need) values ('$eid', '$compname', '$address', '$phone', '$email', '$position', '$description', '$location', '$skill1', '$experience1', '$skill2', '$experience2', '$skill3', '$experience3', '$need')";             if ($db->query ($sql) == true) {                 echo "record added <br>";             }         }     }      if (isset($_post['btndelete'])) {         $eid= $_post['eid'];         $sql = "delete employer employerid='$eid'";         echo mysql_error();         if ($db->query ($sql) == true)         {             echo "record deleted <br>";         }     }      if (isset($_post['btnedit'])) {         $sql = "select * employer employerid='$eid'";         if (($result = $db->query ($sql)) == true)         {             while($row = $result->fetch_assoc()) {                 $eid = $row["employerid"];                 $compname = $row["compname"];                 $address = $row["address"];                 $phone = $row["phone"];                 $email = $row["email"];                 $position = $row["postitle"];                 $description = $row["description"];                 $location = $row["location"];                 $skill1 = $row["skill1"];                 $experience1 = $row["experience1"];                 $skill2 = $row["skill2"];                 $experience2 = $row["experience2"];                 $skill3 = $row["skill3"];                 $experience3 = $row["experience3"];                 $need = $row["need"];             }         }           echo <<<eoe         <form action="$thisphp" method="post">         employer id: <input type="text" name="eid" value='$eid'>          company name: <input type="text" name="compname" value='$compname'>          address: <input type="text" name="address" value='$address'>          phone: <input type="text" name="phone" value='$phone'>          email: <input type="text" name="email" value='$email'><br>         position: <input type="text" name="position" value='$position'>          description: <input type="text" name="description" value='$description'>          location: <select name="state" id="state" value='$location'>             <option value="">--</option>             <option value="al">al</option>              <option value="ak">ak</option>              <option value="az">az</option>              <option value="ar">ar</option>              <option value="ca">ca</option>              <option value="co">co</option>              <option value="ct">ct</option>              <option value="de">de</option>              <option value="fl">fl</option>              <option value="ga">ga</option>              <option value="hi">hi</option>              <option value="id">id</option>              <option value="il">il</option>              <option value="in">in</option>              <option value="ia">ia</option>              <option value="ks">ks</option>              <option value="ky">ky</option>              <option value="la">la</option>              <option value="me">me</option>              <option value="md">md</option>              <option value="ma">ma</option>              <option value="mi">mi</option>              <option value="mn">mn</option>              <option value="ms">ms</option>              <option value="mo">mo</option>              <option value="mt">mt</option>              <option value="ne">ne</option>              <option value="nv">nv</option>              <option value="nh">nh</option>              <option value="nj">nj</option>              <option value="nm">nm</option>              <option value="ny">ny</option>              <option value="nc">nc</option>              <option value="nd">nd</option>              <option value="oh">oh</option>              <option value="ok">ok</option>              <option value="or">or</option>              <option value="pa">pa</option>              <option value="ri">ri</option>              <option value="sc">sc</option>              <option value="sd">sd</option>              <option value="tn">tn</option>              <option value="tx">tx</option>              <option value="ut">ut</option>              <option value="vt">vt</option>              <option value="wa">wa</option>              <option value="wv">wv</option>              <option value="wi">wi</option>              <option value="wy">wy</option>              <option value="dc">dc</option>          </select> <br>         skill: <select name="skill1" value='$skill1'>             <option value="skill1">skill 1</option>             <option value="skill2">skill 2</option>             <option value="skill3">skill 3</option>             </select>         experience: <select name="experience1" value='$experience1'>             <option value="0">0</option>             <option value="1">1-3</option>             <option value="3">3-5</option>             <option value="5">5-10</option>             <option value="10">10+</option>             </select><br>         skill: <select name="skill2" value='$skill2'>             <option value="skill1">skill 1</option>             <option value="skill2">skill 2</option>             <option value="skill3">skill 3</option>             </select>         experience: <select name="experience2" value='$experience'>             <option value="0">0</option>             <option value="1">1-3</option>             <option value="3">3-5</option>             <option value="5">5-10</option>             <option value="10">10+</option>             </select><br>         skill: <select name="skill3" value='$skill3'>             <option value="skill1">skill 1</option>             <option value="skill2">skill 2</option>             <option value="skill3">skill 3</option>             </select>         experience: <select name="experience3" value='$experience3'>             <option value="0">0</option>             <option value="1">1-3</option>             <option value="3">3-5</option>             <option value="5">5-10</option>             <option value="10">10+</option>             </select><br>         need: <input type="radio" name="need" value="urgent" checked value='$name'> urgent (<1 month) <br>              <input type="radio" name="need" value="soon" value='$name'> (1-3 months) <br>              <input type="radio" name="need" value="upcoming" value='$name'> upcoming (3+ month) <br>         <input type="submit" name="update" value="update"> <br>         <hr>         </form>   eoe;    }      if (isset($_post['update'])) {         $link = mysql_connect("0.0.0.0", $username, $password) or die (mysql_error());            $db_selected = mysql_select_db('tschauss', $link);         if (!$db_selected) {     die ('can\'t use foo : ' . mysql_error()); }         mysql_query(" update employer set eid='$eid' , compname='$compname' , address='$address' , phone='$phone' , email='$email' , position='$position' , description= '$description' , location= '$state' , skill1= '$skill1' , experience1= '$experience1' , skill2= '$skill2' , experience2= '$experience2' , skill3= '$skill3' , experience3= '$experience3' , need= '$need' eid='$eid'") or die ("query has failed us" . mysql_error());         echo "record updated <br>";         mysql_close($link);          $sql = "update employer (employerid, compname, address, phone, email, postitle, description, location, skill1, experience1, skill2, experience2, skill3, experience3, need ) values ('$eid', '$compname', '$address', '$phone', '$email', '$position', '$description', '$location', '$skill1', '$experience1', '$skill2', '$experience2', '$skill3', '$experience3', '$need')";         if ($db->query ($sql) == true)         {            mysql_query(" update employer set eid='$eid' , compname='$compname' , address='$address' , phone='$phone' , email='$email' , position=$'position' , description= '$description' , location= '$state' , skill1= '$skill1' , experience1= '$experience1' , skill2= '$skill2' , experience2= '$experience2' , skill3= '$skill3' , experience3= '$experience3' , need= '$need' eid='$eid'");             echo "record updated 2 <br>";         }      }      $sql = "select employerid, compname, address, phone, email, postitle, description, location, skill1, experience1, skill2, experience2, skill3, experience3, need employer";     $result = $db->query($sql);      if ($result->num_rows > 0) {     // output data of each row     while($row = $result->fetch_assoc()) {         echo "employerid: " . $row["employerid"] . " - company name: " . $row["compname"] . " - address: " . $row["address"] . " - phone: " . $row["phone"] . " - email: " . $row["email"] . "<br>" . "position title: " . $row["postitle"] . " - description: " . $row["description"] . " - location: " . $row["location"] . " - skill 1: " . $row["skill1"] . " - experience 1: " . $row["experience1"] . " - skill 2: " . $row["skill2"] . " - experience 2: " . $row["experience2"] . " - skill 3: " . $row["skill3"] . " - experience 3: " . $row["experience3"] . " - need: " . $row["need"];          echo " <form action=\"$thisphp\" method='post' style=\"display:inline\" >";             echo "<input type='hidden' name='eid' value='$eid'>";             echo "<input type='submit' name='btnedit' value='edit'> ";             echo "<input type='submit' name='btndelete' value='delete'>  </form>" . "<br>";     }      } else {         echo "0 results";     }     $db->close(); ?> 

/// -- database below --- ///

-- phpmyadmin sql dump -- version 4.0.9deb1.lucid~ppa.1 -- http://www.phpmyadmin.net -- -- host: localhost -- generation time: mar 30, 2017 @ 01:31 pm -- server version: 5.5.52-0ubuntu0.12.04.1-log -- php version: 5.3.10-1ubuntu3.25  set sql_mode = "no_auto_value_on_zero"; set time_zone = "+00:00";   /*!40101 set @old_character_set_client=@@character_set_client */; /*!40101 set @old_character_set_results=@@character_set_results */; /*!40101 set @old_collation_connection=@@collation_connection */; /*!40101 set names utf8 */;  -- -- database: `tschauss` --  -- --------------------------------------------------------  -- -- table structure table `employer` --  create table if not exists `employer` (   "employerid" int(60) not null,   `compname` varchar(60) not null,   `address` varchar(20) not null,   `phone` int(10) not null,   `email` varchar(30) not null,   `postitle` varchar(30) not null,   `description` varchar(100) not null,   `location` varchar(35) not null,   `skill1` varchar(20) not null,   `experience1` int(10) not null,   `skill2` varchar(20) not null,   `experience2` int(11) not null,   `skill3` varchar(20) not null,   `experience3` int(11) not null,   `need` varchar(15) not null,   primary key (`employerid`) ) engine=innodb default charset=latin1;  -- -- dumping data table `employer` --  insert `employer` (`employerid`, `compname`, `address`, `phone`, `email`, `postitle`, `description`, `location`, `skill1`, `experience1`, `skill2`, `experience2`, `skill3`, `experience3`, `need`) values (0, '', '', 0, '', '', '', '', '', 0, '', 0, '', 0, '');  /*!40101 set character_set_client=@old_character_set_client */; /*!40101 set character_set_results=@old_character_set_results */; /*!40101 set collation_connection=@old_collation_connection */; 

you have used mysql_connect() in update clause of code. if php version 7 , above not work (will work 5.5 , 5.6 versions warning) deprecated.

warning

this extension deprecated in php 5.5.0, , removed in php 7.0.0. instead, mysqli or pdo_mysql extension should used. see mysql: choosing api guide , related faq more information. alternatives function include:

mysqli_connect() pdo::__construct() 

read more here.

i don't see point in establishing new connection while editing when there database connection made in beginning of script. use same functions used insert data database script:

$db->query("update tablename set column_name = value"); // check no. of rows affected previous query  $db->affected_rows() 

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