我有一个名为pvdata的sql表,我想把它导出到csv文件。
但我获得了以下结果,而不是正常的表格:
<br />
<font size='1'><table class='xdebug-error xe-notice' dir='ltr' border='1'cellspacing='0' cellpadding='1'>
<tr><th align='left' bgcolor='#f57900' colspan="5"><span style='background-color: #cc0000; color: #fce94f; font-size: x-large;'>( ! )</span> Notice: Undefined variable: header in C:\wamp\www\EXPORT TABLE\index.php on line <i>28</i></th></tr>
<tr><th align='left' bgcolor='#e9b96e' colspan='5'>Call Stack</th></tr>
<tr><th align='center' bgcolor='#eeeeec'>#</th><th align='left' bgcolor='#eeeeec'>Time</th><th align='left' bgcolor='#eeeeec'>Memory</th><th align='left' bgcolor='#eeeeec'>Function</th><th align='left' bgcolor='#eeeeec'>Location</th></tr>
<tr><td bgcolor='#eeeeec' align='center'>1</td><td bgcolor='#eeeeec' align='center'>0.0035</td><td bgcolor='#eeeeec' align='right'>256088</td><td bgcolor='#eeeeec'>{main}( )</td><td title='C:\wamp\www\EXPORT TABLE\index.php' bgcolor='#eeeeec'>..\index.php<b>:</b>0</td></tr>
</table></font>
"id id state id state Longitude id state Longitude Latitude id state Longitude Latitude Altitude(km) id state Longitude Latitude Altitude(km) Module Tilt id state Longitude Latitude Altitude(km) Module Tilt Module Azimuth id state Longitude Latitude Altitude(km) Module Tilt Module Azimuth Rated Peak Power(kW) id state Longitude Latitude Altitude(km) Module Tilt Module Azimuth Rated Peak Power(kW) Temperature losses coefficient id state Longitude Latitude Altitude(km) Module Tilt Module Azimuth Rated Peak Power(kW) Temperature losses coefficient Nominal Operation Cell Temperature id state Longitude Latitude Altitude(km) Module Tilt Module Azimuth Rated Peak Power(kW) Temperature losses coefficient Nominal Operation Cell Temperature Invertor Effeciency id state Longitude Latitude Altitude(km) Module Tilt Module Azimuth Rated Peak Power(kW) Temperature losses coefficient Nominal Operation Cell Temperature Invertor Effeciency Persil Name <br />"
<font size='1'><table class='xdebug-error xe-notice' dir='ltr' border='1' cellspacing='0' cellpadding='1'>
<tr><th align='left' bgcolor='#f57900' colspan="5"><span style='background-color: #cc0000; color: #fce94f; font-size: x-large;'>( ! )</span> Notice: Undefined variable: data in C:\wamp\www\EXPORT TABLE\index.php on line <i>49</i></th></tr>
<tr><th align='left' bgcolor='#e9b96e' colspan='5'>Call Stack</th></tr>
<tr><th align='center' bgcolor='#eeeeec'>#</th><th align='left' bgcolor='#eeeeec'>Time</th><th align='left' bgcolor='#eeeeec'>Memory</th><th align='left' bgcolor='#eeeeec'>Function</th><th align='left' bgcolor='#eeeeec'>Location</th></tr>
<tr><td bgcolor='#eeeeec' align='center'>1</td><td bgcolor='#eeeeec' align='center'>0.0035</td><td bgcolor='#eeeeec' align='right'>256088</td><td bgcolor='#eeeeec'>{main}( )</td><td title='C:\wamp\www\EXPORT TABLE\index.php' bgcolor='#eeeeec'>..\index.php<b>:</b>0</td></tr>
</table></font>"id state Longitude Latitude Altitude(km) Module Tilt Module Azimuth Rated Peak Power(kW) Temperature losses coefficient Nominal Operation Cell Temperature Invertor Effeciency Persil Name "
"1 ""persil"" ""0"" ""0"" ""0"" ""0"" ""0"" ""0"" ""0.0047"" ""47"" ""0.9"" ""PERSIL07"""
"2 ""other"" ""12"" ""12"" ""0"" ""15"" ""150"" ""12"" ""0.0046"" ""45"" ""0.95"" ""predefined"""
我的PHP代码是:
<?php
$username = "root";
$password = "";
$hostname = "localhost";
$dbhandle = mysql_connect($hostname, $username, $password)
or die("Unable to connect to MySQL");
$selected = mysql_select_db("user data smart grid",$dbhandle)
or die("Could not select Data Base");
header("Content-type: application/csv");
header("Content-Disposition: attachment; filename=pvdata.csv");
header("Pragma: no-cache");
header("Expires: 0");
$query = "SELECT * FROM pvdata";
$export = mysql_query ($query ) or die ( "Sql error : " . mysql_error( ) );
$fields = mysql_num_fields ( $export );
for ( $i = 0; $i < $fields; $i++ )
{
$header .= mysql_field_name( $export , $i ) . "\t";
echo $header;
}
while( $row = mysql_fetch_row( $export ) )
{
$line = '';
foreach( $row as $value )
{
if ( ( !isset( $value ) ) || ( $value == "" ) )
{
$value = "\t";
}
else
{
$value = str_replace( '"' , '""' , $value );
$value = '"' . $value . '"' . "\t";
}
$line .= $value;
}
$data .= trim( $line ) . "\n";
}
$data = str_replace( "\r" , "" , $data );
if ( $data == "" )
{
$data = "\n(0) Records Found!\n";
}
print "$header\n$data";
exit();
?>
那么出了什么问题? 如果我从phpmyadmin手动导出表,它可以正常工作。 我还想在可能的情况下获取表格中列的名称。
答案 0 :(得分:4)
在for循环之前将$ header初始化为空字符串。
$header = '';//initialize header
for ( $i = 0; $i < $fields; $i++ )
{
$header .= mysql_field_name( $export , $i ) . "\t";
echo $header;//remove this line
}
修改强>
同时在循环时初始化$ data。
$data = '';
while( $row = mysql_fetch_row( $export ) )
{
$line = '';
foreach( $row as $value )
{
if ( ( !isset( $value ) ) || ( $value == "" ) )
{
$value = "\t";
}
else
{
$value = str_replace( '"' , '""' , $value );
$value = '"' . $value . '"' . "\t";
}
$line .= $value;
}
$data .= trim( $line ) . "\n";
}
答案 1 :(得分:1)
我不知道它是否是拼写错误,但在你的脚本中是空格
<?php
这将导致传递html文档,并且您的标头调用将失败。因此,在“标题”调用之前删除空格和任何其他输出。
您收到错误消息,请尝试快速解决方法:
error_reporting(0);
第28行:$ header未知,这是
$header .=
附加到未知变量。
答案 2 :(得分:0)
您可以使用fputcsv函数来清除代码。
答案 3 :(得分:0)
试用此代码 -
<?php
// Database Connection
$host="localhost";
$uname="root";
$pass="";
$database = "a2zwebhelp";
$connection=mysql_connect($host,$uname,$pass);
echo mysql_error();
//or die("Database Connection Failed");
$selectdb=mysql_select_db($database) or
die("Database could not be selected");
$result=mysql_select_db($database)
or die("database cannot be selected <br>");
// Fetch Record from Database
$output = "";
$table = ""; // Enter Your Table Name
$sql = mysql_query("select * from $table");
$columns_total = mysql_num_fields($sql);
// Get The Field Name
for ($i = 0; $i < $columns_total; $i++) {
$heading = mysql_field_name($sql, $i);
$output .= '"'.$heading.'",';
}
$output .="\n";
// Get Records from the table
while ($row = mysql_fetch_array($sql)) {
for ($i = 0; $i < $columns_total; $i++) {
$output .='"'.$row["$i"].'",';
}
$output .="\n";
}
// Download the file
$filename = time().'csv'; //For unique file name
header('Content-type: application/csv');
header('Content-Disposition: attachment; filename='.$filename);
echo $output;
exit;
?>