为什么我通过php/mysql生成的CSV文件上写有错误,而不是数据
我一直在尝试通过我的一个sql表InnoDB创建CSV文件。当前,当我运行生成CSV的相应脚本时。它下载一个CSV文件,该文件的单元格上写有错误,如下所示: PHP警告:空行数据包正文 脚本: 生成CSV的函数:为什么我通过php/mysql生成的CSV文件上写有错误,而不是数据,php,mysql,csv,Php,Mysql,Csv,我一直在尝试通过我的一个sql表InnoDB创建CSV文件。当前,当我运行生成CSV的相应脚本时。它下载一个CSV文件,该文件的单元格上写有错误,如下所示: PHP警告:空行数据包正文 脚本: 生成CSV的函数: 更新:当表有超过10000条记录时会出现此错误,否则它可以正常工作。有人能告诉我为什么大量记录会出现这种情况吗?这里有一个我用来将数据提取到csv的小库,它在过去运行得非常好。它使用fputcsv,但需要PDO数据库连接,这可能是正常的,因为您使用的数据库连接已弃用。FetchTabl
更新:当表有超过10000条记录时会出现此错误,否则它可以正常工作。有人能告诉我为什么大量记录会出现这种情况吗?这里有一个我用来将数据提取到csv的小库,它在过去运行得非常好。它使用fputcsv,但需要PDO数据库连接,这可能是正常的,因为您使用的数据库连接已弃用。FetchTable函数是一个实际构建csv并将其保存到磁盘的函数,从技术上讲,您可以复制该代码并将其修改为纯过程:
class CSVtoZip
{
protected $db;
protected $files;
protected $zipname;
protected $headerAddr;
protected $rootdir;
public function __construct($rootdir = '',$db)
{
$this->db = $db;
$this->rootdir = $rootdir;
}
public function FetchTable($table = false, $columns = array(), $filename = false, $db)
{
if($table !== false && $filename !== false && !empty($columns)) {
$filename = $this->rootdir.$filename.".csv";
$output = fopen($filename, 'w');
fputcsv($output, $columns);
$query = $this->db->prepare("select ".implode(",",$columns)." from $table");
$query->execute();
while($rows = $query->fetch(PDO::FETCH_ASSOC)) {
fputcsv($output, $rows);
}
$this->files[] = $filename;
fclose($output);
}
}
public function Zipit($zipname = false)
{
if(isset($this->files) && !empty($this->files)) {
$this->zipname = ($zipname == false)? date("YmdHis").uniqid().".zip":$zipname;
$zipper = new ZipArchive();
$zipper->open($this->rootdir.$this->zipname, ZipArchive::CREATE);
foreach($this->files as $filelocation) {
$zipper->addFile(basename($filelocation));
}
$zipper->close();
foreach($this->files as $filelocation) {
unlink($filelocation);
}
$this->headerAddr = "Location: ".str_replace($_SERVER['DOCUMENT_ROOT'],"",$this->rootdir.$this->zipname);
$this->DownloadZip();
unlink($this->rootdir.$this->zipname);
}
}
protected function DownloadZip()
{
if(isset($this->headerAddr)) {
header('Content-Type: text/csv; charset=utf-8');
header('Content-Disposition: attachment; filename='.basename($this->zipname));
header($this->headerAddr);
}
}
}
// Accepts a root directory and database connection (PDO)
$csv = new CSVtoZip($_SERVER['DOCUMENT_ROOT'].'/mydirectory/',$con);
// Fetch 'users' table and grab specific columns, name the file users.csv
$csv->FetchTable('users',array('ID','usergroup','first_name'),'users');
// Fetch another table with 2 columns, name it table2.csv
$csv->FetchTable('table2',array('ID','username'),'table2');
// Zip the file(s) into an archive called tester.zip, then download it
$csv->Zipit('tester.zip');
这是一种表锁与行锁的对比,用于处理大量记录/缓冲区和更新 解决这个问题最简单的方法就是将其切换到InnoDB 在执行此操作之前锁定MyISAM表也可能会起作用,请尝试一下
编辑:我删除了,只要试着锁定它,这样当你转储它时,你是唯一一个访问它的人。这实际上是一个mysql错误。是的,它是如何导致你知道的!!!有些人说我要检查表是否是myisam,因为这会导致错误。但是它已经是innodb了。为什么要手动创建CSV呢?你能给我一两个关于其他方法的提示吗
function exportMysqlToCsv($table,$filename = 'export.csv')
{
$csv_terminated = "\n";
$csv_separator = ",";
$csv_enclosed = '"';
$csv_escaped = "\\";
$sql_query = "select * from $table";
// Gets the data from the database
$result = mysql_query($sql_query);
$fields_cnt = mysql_num_fields($result);
$schema_insert = '';
for ($i = 0; $i < $fields_cnt; $i++)
{
$l = $csv_enclosed . str_replace($csv_enclosed, $csv_escaped . $csv_enclosed,
stripslashes(mysql_field_name($result, $i))) . $csv_enclosed;
$schema_insert .= $l;
$schema_insert .= $csv_separator;
} // end for
$out = trim(substr($schema_insert, 0, -1));
$out .= $csv_terminated;
// Format the data
while ($row = mysql_fetch_array($result))
{
$schema_insert = '';
for ($j = 0; $j < $fields_cnt; $j++)
{
if ($row[$j] == '0' || $row[$j] != '')
{
if ($csv_enclosed == '')
{
$schema_insert .= $row[$j];
} else
{
$schema_insert .= $csv_enclosed .
str_replace($csv_enclosed, $csv_escaped . $csv_enclosed, $row[$j]) . $csv_enclosed;
}
} else
{
$schema_insert .= '';
}
if ($j < $fields_cnt - 1)
{
$schema_insert .= $csv_separator;
}
}
$out .= $schema_insert;
$out .= $csv_terminated;
}
header("Cache-Control: must-revalidate, post-check=0, pre-check=0");
header("Content-Length: " . strlen($out));
// Output to browser with appropriate mime type, you choose ;)
header("Content-type: text/x-csv");
//header("Content-type: text/csv");
//header("Content-type: application/csv");
header("Content-Disposition: attachment; filename=$filename");
echo $out;
exit;
}
class CSVtoZip
{
protected $db;
protected $files;
protected $zipname;
protected $headerAddr;
protected $rootdir;
public function __construct($rootdir = '',$db)
{
$this->db = $db;
$this->rootdir = $rootdir;
}
public function FetchTable($table = false, $columns = array(), $filename = false, $db)
{
if($table !== false && $filename !== false && !empty($columns)) {
$filename = $this->rootdir.$filename.".csv";
$output = fopen($filename, 'w');
fputcsv($output, $columns);
$query = $this->db->prepare("select ".implode(",",$columns)." from $table");
$query->execute();
while($rows = $query->fetch(PDO::FETCH_ASSOC)) {
fputcsv($output, $rows);
}
$this->files[] = $filename;
fclose($output);
}
}
public function Zipit($zipname = false)
{
if(isset($this->files) && !empty($this->files)) {
$this->zipname = ($zipname == false)? date("YmdHis").uniqid().".zip":$zipname;
$zipper = new ZipArchive();
$zipper->open($this->rootdir.$this->zipname, ZipArchive::CREATE);
foreach($this->files as $filelocation) {
$zipper->addFile(basename($filelocation));
}
$zipper->close();
foreach($this->files as $filelocation) {
unlink($filelocation);
}
$this->headerAddr = "Location: ".str_replace($_SERVER['DOCUMENT_ROOT'],"",$this->rootdir.$this->zipname);
$this->DownloadZip();
unlink($this->rootdir.$this->zipname);
}
}
protected function DownloadZip()
{
if(isset($this->headerAddr)) {
header('Content-Type: text/csv; charset=utf-8');
header('Content-Disposition: attachment; filename='.basename($this->zipname));
header($this->headerAddr);
}
}
}
// Accepts a root directory and database connection (PDO)
$csv = new CSVtoZip($_SERVER['DOCUMENT_ROOT'].'/mydirectory/',$con);
// Fetch 'users' table and grab specific columns, name the file users.csv
$csv->FetchTable('users',array('ID','usergroup','first_name'),'users');
// Fetch another table with 2 columns, name it table2.csv
$csv->FetchTable('table2',array('ID','username'),'table2');
// Zip the file(s) into an archive called tester.zip, then download it
$csv->Zipit('tester.zip');