Php 更新将零值写入数据库的查询

我正在尝试更新表单中未填写的某些字段，但当我单击“更新”按钮时，早期存储的值设置为0，新插入的值保持不变。如果我再次尝试编辑记录，则会继续此操作。以前存储的值设置为0。如果有人可以查看此信息并帮助我解决此问题，那太好了

以下是编辑页面的代码

    <?php
    include 'db.php';
    $mykey1=$_REQUEST['key1'];
    $mykey2=$_REQUEST['key2'];
    $mykey3=$_REQUEST['key3'];
    $mykey4=$_REQUEST['key4'];
    $mykey5=$_REQUEST['key5'];
    $mykey6=$_REQUEST['key6'];
    $mykey7=$_REQUEST['key7'];
    $mykey8=$_REQUEST['key8'];
    $mykey9=$_REQUEST['key9'];
    $mykey10=$_REQUEST['key10'];
    $mykey11=$_REQUEST['key11'];
    $mykey12=$_REQUEST['key12'];
    $mykey13=$_REQUEST['key13'];
    $mykey14=$_REQUEST['key14'];
    $mykey15=$_REQUEST['key15'];
    $mykey16=$_REQUEST["key16"];



    $t6 = "SELECT t.name FROM sicherheitsunterweisung as t where t.id = '".$mykey6."'";
    $r6 = mysql_query($t6)or die($myQuery."<br/><br/>".mysql_error());
    while($row = mysql_fetch_assoc($r6)){
    $x6= $row['name'];  //handle rows.
    }


    $t7 = "SELECT t.training FROM trainings as t where t.id = '".$mykey7."'";
    $r7 = mysql_query($t7)or die($myQuery."<br/><br/>".mysql_error());
    while($row = mysql_fetch_assoc($r7)){
    $x7= $row['training'];  //handle rows.
    }

    $t8 = "SELECT t.training FROM trainings as t where t.id = '".$mykey8."'";
    $r8 = mysql_query($t8)or die($myQuery."<br/><br/>".mysql_error());
    while($row = mysql_fetch_assoc($r8)){
    $x8= $row['training'];  //handle rows.
    }

    $t9 = "SELECT t.training FROM trainings as t where t.id = '".$mykey9."'";
    $r9 = mysql_query($t9)or die($myQuery."<br/><br/>".mysql_error());
    while($row = mysql_fetch_assoc($r9)){
    $x9= $row['training'];  //handle rows.
    }

    $t10 = "SELECT t.training FROM trainings as t where t.id = '".$mykey10."'";
    $r10 = mysql_query($t10)or die($myQuery."<br/><br/>".mysql_error());
    while($row = mysql_fetch_assoc($r10)){
    $x10= $row['training'];  //handle rows.
    }

    $t11 = "SELECT t.training FROM trainings as t where t.id = '".$mykey11."'";
    $r11 = mysql_query($t11)or die($myQuery."<br/><br/>".mysql_error());
    while($row = mysql_fetch_assoc($r11)){
    $x11= $row['training'];  //handle rows.
    }

    $t12 = "SELECT t.training FROM trainings as t where t.id = '".$mykey12."'";
    $r12 = mysql_query($t12)or die($myQuery."<br/><br/>".mysql_error());
    while($row = mysql_fetch_assoc($r12)){
    $x12= $row['training'];  //handle rows.
    }

    $t13 = "SELECT t.training FROM trainings as t where t.id = '".$mykey13."'";
    $r13 = mysql_query($t13)or die($myQuery."<br/><br/>".mysql_error());
    while($row = mysql_fetch_assoc($r13)){
    $x13= $row['training'];  //handle rows.
    }

    $t14 = "SELECT t.training FROM trainings as t where t.id = '".$mykey14."'";
    $r14 = mysql_query($t14)or die($myQuery."<br/><br/>".mysql_error());
    while($row = mysql_fetch_assoc($r14)){
    $x14= $row['training'];  //handle rows.
    }

    $t15 = "SELECT t.training FROM trainings as t where t.id = '".$mykey15."'";
    $r15 = mysql_query($t15)or die($myQuery."<br/><br/>".mysql_error());
    while($row = mysql_fetch_assoc($r15)){
    $x15= $row['training'];  //handle rows.
    }

    $t16 = "SELECT t.training FROM trainings as t where t.id = '".$mykey16."'";
    $r16 = mysql_query($t16)or die($myQuery."<br/><br/>".mysql_error());
    while($row = mysql_fetch_assoc($r16)){
    $x16= $row['training'];  //handle rows.
    }
    echo "<form action='update.php?key1=" . $mykey1 .  "'method='POST'>";
    echo "<center><table>";
    echo  "<TR><TD>ID Number</TD><TD><INPUT TYPE=text name='pers_nr' value=$mykey1 disabled = true></TD></TR>";
    echo  "<TR><TD>Family Name</TD><TD><INPUT TYPE=text name='n_name' value=$mykey2 disabled = true ></TD></TR>";
    echo  "<TR><TD>First Name</TD><TD><INPUT TYPE=text name='v_name' value=$mykey3 disabled = true></TD></TR>";
    echo  "<TR><TD>Access Level</TD><TD><INPUT TYPE=text name='berectigung_id' value=$mykey4 disabled = true></TD></TR>";
    echo  "<TR><TD>Sicherheitsunterweisung</TD><TD><INPUT TYPE=text name='sicherheisunterweisung_id' value=$x6 disabled = true ></TD></TR>";
    echo  "<TR><TD>Experience</TD><TD><INPUT TYPE=text name='erfahrungen_id' value=$mykey5 ></TD></TR>";
    if($x7!= NULL)
    {
    echo  "<TR><TD>Schulung 1</TD><TD><INPUT TYPE=text name='schulungen_id1' value=$x7 disabled = true></TD></TR>";
     }
     else {
    $sql1="SELECT id,training  FROM trainings as s"; 
    $result=mysql_query($sql1); 
    echo "<TR><TD> Schulung 1</TD><TD> <select name='schulungen_id1'><option value            default>$x7</option>";
    while ($row = mysql_fetch_array($result)) 
    {
    echo "<option value='".$row['id']."'>" . $row['training'] . "</option>";
    }
    echo "</select></TD></TR>";
    }
    if($x8!= NULL)
    {
    echo  "<TR><TD>Schulung 2</TD><TD><INPUT TYPE=text name='schulungen_id2' value=$x8 disabled = true></TD></TR>";
    }
    else {
    $sql2="SELECT id,training  FROM trainings as s"; 
    $result=mysql_query($sql2); 
    echo "<TR><TD> Schulung 2</TD><TD> <select name='schulungen_id2'><option value default>$x8</option>";
    while ($row = mysql_fetch_array($result)) 
    {
    echo "<option value='".$row['id']."'>" . $row['training'] . "</option>";
     }
     echo "</select></TD></TR>";
    }
   if($x9!= NULL)
   {
   echo  "<TR><TD>Schulung 3</TD><TD><INPUT TYPE=text name='schulungen_id3' value=$x9 disabled = true></TD></TR>";
    }
   else {
   $sql3="SELECT id,training  FROM trainings as s"; 
   $result=mysql_query($sql1); 
   echo "<TR><TD> Schulung 3 </TD><TD><select name='schulungen_id3'><option value default>$x9</option>";
   while ($row = mysql_fetch_array($result)) 
   {
   echo "<option value='".$row['id']."'>" . $row['training'] . "</option>";
   }
   echo "</select></TD></TR>";
   }
   if($x10!= NULL)
   {
   echo  "<TR><TD>Schulung 4</TD><TD><INPUT TYPE=text name='schulungen_id4' value=$x10 disabled = true></TD></TR>";
   }
   else {
   $sql4="SELECT id,training  FROM trainings as s"; 
   $result=mysql_query($sql4); 
   echo "<TR><TD> Schulung 4 </TD><TD><select name='schulungen_id4'><option value default>$x10</option>";
   while ($row = mysql_fetch_array($result)) 
   {
   echo "<option value='".$row['id']."'>" . $row['training'] . "</option>";
   }
   echo "</select></TD></TR>";
   }
   if($x11 != NULL)
   {
   echo  "<TR><TD>Schulung 5</TD><TD><INPUT TYPE=text name='schulungen_id5' value=$x11  disabled = true></TD></TR>";
   }
   else {
   $sql5="SELECT id,training  FROM trainings as s"; 
   $result=mysql_query($sql5); 
   echo "<TR><TD> Schulung 5 </TD><TD><select name='schulungen_id5'><option value       default>$x11</option>";
   while ($row = mysql_fetch_array($result)) 
   {
   echo "<option value='".$row['id']."'>" . $row['training'] . "</option>";
   }
   echo "</select></TD></TR>";
   }
   if($x12 != NULL)
   {
   echo  "<TR><TD>Schulung 6</TD><TD><INPUT TYPE=text name='schulungen_id6' value=$x12 disabled = true></TD></TR>";
   }
   else 
   {
   $sql6="SELECT id,training  FROM trainings as s"; 
   $result=mysql_query($sql6); 
   echo "<TR><TD> Schulung 6 </TD><TD><select name='schulungen_id6'><option value default>$x12</option>";
   while ($row = mysql_fetch_array($result)) 
   {
   echo "<option value='".$row['id']."'>" . $row['training'] . "</option>";
   }
   echo "</select></TD></TR>";
   }
   if($x13!= NULL)
   {
   echo  "<TR><TD>Schulung 7</TD><TD><INPUT TYPE=text name='schulungen_id7' value=$x13 disabled = true></TD></TR>";
   }
   else {
   $sql7="SELECT id,training  FROM trainings as s"; 
   $result=mysql_query($sql7); 
   echo "<TR><TD> Schulung 7</TD><TD> <select name='schulungen_id7'><option value default>$x13</option>";
   while ($row = mysql_fetch_array($result)) 
   {
   echo "<option value='".$row['id']."'>" . $row['training'] . "</option>";
   }
   echo "</select></TD></TR>";
   }
   if($x14!= NULL)
   {
   echo  "<TR><TD>Schulung 8</TD><TD><INPUT TYPE=text name='schulungen_id8' value=$x14 disabled = true></TD></TR>";
   }
   else {
   $sql8="SELECT id,training  FROM trainings as s"; 
   $result=mysql_query($sql8); 
   echo "<TR><TD> Schulung 8</TD><TD> <select name='schulungen_id8'><option value default>$x14</option>";
   while ($row = mysql_fetch_array($result)) 
   {
   echo "<option value='".$row['id']."'>" . $row['training'] . "</option>";
    }
   echo "</select></TD></TR>";
    }
   if($x15!= NULL)
   {
    echo  "<TR><TD>Schulung 9</TD><TD><INPUT TYPE=text name='schulungen_id9' value=$x15 ></TD></TR>";
    }
   else {
   $sql9="SELECT id,training  FROM trainings as s"; 
   $result=mysql_query($sql9); 
   echo "<TR><TD> Schulung 9 </TD><TD><select name='schulungen_id9'><option value default>$x15</option>";
   while ($row = mysql_fetch_array($result)) 
    {
    echo "<option value='".$row['id']."'>" . $row['training'] . "</option>";
     }
    echo "</select></TD></TR>";
    }
    if($x16!= NULL)
    {
    echo  "<TR><TD>Schulung 10</TD><TD><INPUT TYPE=text name='schulungen_id10' value=$x16 ></TD></TR>";
    }
    else {
    $sql10="SELECT id,training  FROM trainings as s"; 
    $result=mysql_query($sql10); 
    echo "<TR><TD> Schulung 10</TD><TD> <select name='schulungen_id10'><option value default>$x16</option>";
    while ($row = mysql_fetch_array($result)) 
    {
    echo "<option value='".$row['id']."'>" . $row['training'] . "</option>";
    }
    echo "</select></TD></TR>";
    }
    echo "<TR><TD><INPUT TYPE=submit value=Update></TD><TD><INPUT TYPE=reset value='cancel'></TD></TR></table>";

---

这可能是由于使用
disabled=true
造成的

<INPUT TYPE=text name='schulungen_id1' value=$x7 disabled = true>



从-

这就是禁用属性的工作方式。禁用表单控件时，提交表单时将忽略该值，并且$\u POST（或$\u GET）中不存在该键

如果您希望值出现在提交的数据中，但不希望用户能够更改页面上的值（我想这就是您试图实现的），请使用readonly=“readonly”而不是disabled=“disabled”

另见-

<INPUT TYPE=text name='schulungen_id1' value=$x7 disabled = true>