我正在尝试创建一个表格，用于使用从卫星收集的数据更新水库信息。
我返回要创建的 php 代码，但无法显示表单。我只看到一个空白网页。可能是什么问题。请参阅下面的代码：
<?php
$id = $_SESSION['user'];
include "pgsql.connect.php";
$text="";
$seasonArray = array('Dry','Wet');
$sateliteDataTypeArray = array('MSS','LANDSAT TM','LANDSAT ETM','JRS','SPOT','ASTER','ALMAZ','IRS','OTHER');
echo "What!!!";
$id_query="SELECT * FROM tbl_reservoir";
$id_result=@mysql_query($id_query,$dbc);
$text.='<form enctype="multipart/form-data" action="index.php?mod=update_res" method="post">
<table><tr><td>Reservior ID: </td><td><select id="res_id" name="res_id">
<option selected></option>';
while ($id_row=@mysql_fetch_array($id_result)) {
$ids=$id_row['res_id'];
$text.='<option>'.$ids.'</option>';
}
$text.='</select>
</td></tr>
<tr><td>Reading Date: </td><td><input type="text" name="reading_date" size="25" maxlength="25" value="" />
</td></tr>
<tr><td>Satelite Datatype: </td><td><select id="sat_data" name="sat_data">';
// For each value of the array assign variable name Satelite Type
foreach($sateliteDataTypeArray as $sat){
$text.='<option>'.$sat.'</option>';}
$text.='</select></td></tr>
<tr><td>Dry or Wet Season: </td><td><select id="season" name="season">';
// For each value of the array assign variable name city
foreach($seasonArray as $season){
$text.='<option>'.$season.'</option>';}
$text.='</select>
</td></tr>
<tr><td>Reservoir Surface Area: </td><td><input type="text" name="surfArea" size="25" maxlength="25" value="" />
</td></tr>
<tr><td>Reservoir Volume: </td><td><input type="text" name="resVol" size="25" maxlength="25" value="" />
</td></tr>
<tr><td>Reservoir Average Depth: </td><td><input type="text" name="resAvDepth" size="25" maxlength="25" value="" />
</td></tr>
</table>
<div align="center"><input type="submit"
name="submit" value="Submit" /></div>
<input type="hidden" name="submitted"
value="TRUE" />
</form>';
//end form creation
if(isset($_POST['submitted'])) //checks if form submitted
{
//assign entered values from the form to variables
$resID=$_POST['res_id'];
$dateReading=$_POST['reading_date'];
$satType=$_POST['sat_data']
$season=$_POST['season']
$surfaceArea=$_POST['surfArea'];
$resVol=$_POST['resVol'];
$avDepth=$_POST['resAvDepth'];
//echo $plot.
$warning='';
//validate the entered values into the form
if($dateReading==''||$satType==''|| $season=='' || $surfaceArea=='' || $resVol=='' || $avDepth=='')
{
$warning="<span class='warning'>Please complete all fields.</span>";
}
//if (s)he's made an error (one of the above IF statements is true
if($warning!='')
{
//display the form with some error or warning message(s)
$p=new Page('Join us');
$p->setHeading('Please complete the form');
$p->setContent($text.$warning.$form_text);
$p->printIt();
}
else
{
//****************** insert satelite data details into SATELITE DATA TABLE *******************************
$query="INSERT INTO tbl_volfromsatelite SET res_id='$resID',
reading_date='$dateReading',
res_sat_surfacearea='$surfaceArea',
res_avg_depth='$avDepth',
res_vol='$resVol',
dry_or_wet='$season',
sat_datatype='$satType'";
$result=@mysql_query($query,$dbc) or die(mysql_error());
//mysql_close($dbc);
//********************************************************************************************************
if ($result)
{
//update reservoir details in the Database
$q="UPDATE tbl_reservoir SET res_vol='$resVol', res_area='$surfaceArea', res_vol_date='$dateReading' WHERE res_id='$resID'";
$r=@mysql_query($q);
if(@mysql_affected_rows()==1)
{
$p=new Page('Update Reservoir Details');
$p->setHeading('Update Complete');
$p->setContent('The Reservoir details have been updated');
$p->printIt();
}
else
{
$p=new Page('Update Error');
$p->setHeading('Update not successful');
$_POST['res_id']='';
$p->setContent($text.'The reservoir details could not be updated due to some system error.
<br/> We apolosize for inconvenience <p/>');
$p->printIt();
}
}
}
}
else
{
//display the form
$p=new Page('Update Reservoir Information');
$p->setHeading('Please complete the form, <b>all fields are compulsary</b>.');
$p->setContent($text);
$p->printIt();
}
?>