在PHP中查询mysql并以CSV格式导出数据

如果您想将每一行MySQL写入CSV文件，您可以使用PHP5内置的函数fputcsv

$result = mysqli_query($con, 'SELECT * FROM table');
$row = mysqli_fetch_array($result, MYSQLI_ASSOC);
$fp = fopen('file.csv', 'w');
foreach ($row as $val) {
    fputcsv($fp, $val);
}
fclose($fp);

应该为写入file.csv的每一行返回一个逗号分隔的字符串:

row1 val1, row1 val2
row2 val1, row2 val2 
etc..

这是一个通过使用MySQLi的fetch_fields函数合并头或字段名的解决方案-

$query = "SELECT * FROM table";
$result = $db->query($query);
if (!$result) die('Couldn''t fetch records');
$headers = $result->fetch_fields();
foreach($headers as $header) {
    $head[] = $header->name;
}
$fp = fopen('php://output', 'w');
if ($fp && $result) {
    header('Content-Type: text/csv');
    header('Content-Disposition: attachment; filename="export.csv"');
    header('Pragma: no-cache');
    header('Expires: 0');
    fputcsv($fp, array_values($head)); 
    while ($row = $result->fetch_array(MYSQLI_NUM)) {
        fputcsv($fp, array_values($row));
    }
    die;
}

这也是一个不同的答案的修改，其中提出了类似的解决方案，但头部分不适合我，所以我改变了检索它们的方法。功劳归功于@Jrgns

你可以尝试使用MySql的INTO OUTFILE子句:

SELECT *
  INTO OUTFILE '/tmp/tablename.csv'
       FIELDS TERMINATED BY ',' OPTIONALLY ENCLOSED BY '"'
       LINES TERMINATED BY ''n'
   FROM tablename
  WHERE userid = 1

用于从mysqli查询(使用面向对象)创建和下载csv文件，我认为这将有所帮助。

这是一个连接数据库的类，函数将使用mysqli和PHP做任何你想做的事情。在这种情况下，调用这个类(require或include)，只需使用"downloadCsv()"函数。

作为一个例子，这是"class.php"文件:

<?php
class DB{
private $con;
//this constructor connects with the database
public function __construct(){
$this->con = new mysqli("Your_Host","Your_User","Your_Pass","Your_DatabaseName");
if($this->con->connect_errno > 0){
    die('There was a problem [' . $con->connect_error . ']');
    }
}
//create the function that will download a csv file from a mysqli query
public function downloadCsv(){
$count = 0;
$header = "";
$data = "";
//query
$result = $this->con->query("SELECT * FROM Your_TableName");
//count fields
$count = $result->field_count;
//columns names
$names = $result->fetch_fields();
//put column names into header
foreach($names as $value) {
    $header .= $value->name.";";
    }
}
//put rows from your query
while($row = $result->fetch_row())  {
    $line = '';
    foreach($row as $value)       {
        if(!isset($value) || $value == "")  {
            $value = ";"; //in this case, ";" separates columns
    } else {
            $value = str_replace('"', '""', $value);
            $value = '"' . $value . '"' . ";"; //if you change the separator before, change this ";" too
        }
        $line .= $value;
    } //end foreach
    $data .= trim($line)."'n";
} //end while
//avoiding problems with data that includes "'r"
$data = str_replace("'r", "", $data);
//if empty query
if ($data == "") {
    $data = "'nno matching records found'n";
}
$count = $result->field_count;
//Download csv file
header("Content-type: application/octet-stream");
header("Content-Disposition: attachment; filename=FILENAME.csv");
header("Pragma: no-cache");
header("Expires: 0");
echo $header."'n".$data."'n";
}
?>

创建"class.php"文件后，在本例中，对"download.php"文件使用该函数:

<?php
//call the "class.php" file
require_once 'class.php';
//instantiate DB class
$export = new DB();
//call function
$export->downloadCsv();
?>

下载后，用MS Excel打开文件

我希望这对你有帮助，我认为我写得很好，我对文本和代码字段感到不舒服。

试一下

function addRowToCsv(& $csvString, $cols) {
    $csvString .= implode(',', $cols) . PHP_EOL; //Edits must be 6 characters - all I added was a "." before the =. :-)
}
$csvString = '';
$first = true;
while ($row = mysqli_fetch_assoc($query)) {
    if ($first === true) {
        $first = false;
        addRowToCsv($csvString, array_keys($row));
    }
    addRowToCsv($csvString, $row);
}
header('Content-type: text/csv');
header('Content-disposition: attachment;filename=MyCsvFile.csv');
echo $csvString;

注意，addRowToCsv的第一个参数是通过引用传递的。这不是必需的，您可以很容易地使用返回值，但这正是我要做的。

如果您想将输出保存到文件中，而不是作为下载提供，则使用上述命令，但替换

header('Content-type: text/csv');
header('Content-disposition: attachment;filename=MyCsvFile.csv');
echo $csvString;

file_put_contents('MyCsvFile.csv', $csvString);