使用不同的SQL查询多次将此MySQL重复为CSV

Question

我有以下PHP，它会以CSV格式将结果返回给我查询，但顶部显示的LIKE语句中的代码（两个字母）需要在多个不同的代码之间进行更改。

我有大约30种不同的代码。 我需要定义所有代码，例如：

CV，LC，RCA，JOR等......

并让脚本为每个不同的代码创建一个新的CSV，然后快速地逐个处理每个代码。 所以我最终得到了30个文件。 我可能需要这样做几次，所以手动更改它30次不是我的首选。

<?php

// database variables
$hostname = "localhost";
$user = "###";
$password = "###";
$database = "###";

$select = "select * from subscribers where list=27 and custom_fields LIKE '%\%CV\%%'";

$con = mysql_connect($hostname, $user, $password);
$db_selected = mysql_select_db($database, $con);

// Check connection
if (!$con)
{
    die('Could not connect: ' . mysql_error());
}

$export = mysql_query ( $select ) or die ( "Sql error : " . mysql_error( ) );

$fields = mysql_num_fields ( $export );

for ( $i = 0; $i < $fields; $i++ )
{
    $header .= mysql_field_name( $export , $i ) . "\t";
}

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";
}

header("Content-type: application/octet-stream");
header("Content-Disposition: attachment; filename=list-export.xls");
header("Pragma: no-cache");
header("Expires: 0");
print "$header\n$data";

?>

Answer 1

正如Mike W所说，你只需要一个包含你的代码的数组，如下所示：
$codes = array("CV", "LC", "RCA", "JOR", etc....)

然后生成查询，但直到您检查连接为止：

//...
// connection has been checked
foreach($codes as $single_code){
  // do the file-writing-stuff here, using $single_code to generate each query
}
// ...

为什么不考虑查询中的两个字段（ select FIELD1, FIELD2 from subscribers... ）？
如果这些字段名称因代码而异，您可以使用以下内容：

1. 将数组声明为
   $codes = array("CV"=>"field_a, field_b", "LC"=>"field_c, field_d", ...)
2. 生成查询如下
   foreach($codes as $single_code){ $select = "select $codes[$single_code] from subscribers where list=27 and custom_fields LIKE '%$single_code%'"; // ... }

Answer 2

最简单的方法是使用OR运算符在查询中插入所有值：

SELECT * 
FROM subscribers
WHERE list = 27 
AND (
     custom_fields LIKE '%value_1%'
  OR custom_fields LIKE '%value_2%'
  OR custom_fields LIKE '%value_3%'
  OR custom_fields LIKE '%value_4%'
)

等等。

请阅读为什么你不应该在PHP中使用mysql_ * functons 。

编辑

对不起，我没有这样理解你的问题。

@RenéHoffmann的答案就是要走的路。

首先创建一个包含所有值和相关文件的数组：

$data = array(
    'value1' => 'myvalue1.csv',
    'value2' => 'myvalue2.csv',
    'value3' => 'myvalue3.csv',
    ...
); 

然后迭代这个数组：

foreach ($data as $value => $file)
{
    $escapedValue = mysql_real_escape_string($value);
    $select = "select * from subscribers where list=27 and field LIKE '%{$escapedData}%'";
    $response = mysql_query($select);

    $rows = array();
    while ($row = mysql_fetch_assoc($response))
    {
        $rows[] = $row;
    }

    $csv = array2csv($rows); // see https://stackoverflow.com/a/13474770/731138
    file_put_contents($file, $csv);
}

Answer 3

在csv文件中导出数据的最简单方法是使用INTO OUTFILE ：

你的代码：

<?php 

$codes = array("CV", "LC", "RCA", "JOR", etc....)


foreach($codes as $single_code){

   $query = "SELECT * 
               INTO OUTFILE '/tmp/document_".$single_code.".csv'
               FIELDS TERMINATED BY ',' OPTIONALLY ENCLOSED BY '".'"'."'
               LINES TERMINATED BY '\n'
        FROM subscribers WHERE list=27 AND custom_fields LIKE '%\%".$single_code."\%%'"; 

   $export = mysql_query ( $query ) or die ( "Sql error : " . mysql_error( ) );

}

?>

Answer 4

1. 不要使用'mysql'扩展名。

2. 使用内置的csv-writing函数，因为没有理由手工完成。

---

<?php

$dbh = new PDO('mysql:host=localhost;dbname=database', 'user', 'password');

$data   = fopen('php://temp', 'r+');
$header = false;

$codes = ["CV", "LC", "RCA", "JOR", '...'];
foreach ($codes as $code) {
    $result = $dbh->query("select * from subscribers where list=27 and custom_fields LIKE '%{$code}%'");

    if ($result->rowCount()) {
        while ($row = $result->fetch(PDO::FETCH_ASSOC)) {
            if (!$header) {
                $header   = true;
                fputcsv($data, array_keys($row));
            }

            fputcsv($data, $row);
        }
    } else {
        fputcsv($data, ["(0) Records Found!"]);
    }
}

// Read what we have written.
header("Content-type: application/octet-stream");
header("Content-Disposition: attachment; filename=list-export.xls");
header("Pragma: no-cache");
header("Expires: 0");
rewind($data);
echo stream_get_contents($data);

Answer 5

“把你所有的代码放在一个数组中，然后通过它为每个代码构建一个新的查询，”Hobo Sapiens说道。 让我们来做吧！

<?php

// database variables
$hostname = "localhost";
$user = "###";
$password = "###";
$database = "###";
$codes = array("CV", "LC", "RCA", "JOR");

$con = mysql_connect($hostname, $user, $password);
$db_selected = mysql_select_db($database, $con);

// Check connection
if (!$con)
{
    die('Could not connect: ' . mysql_error());
}


for ( $c = 0; $c < $codes; $c++ )
{

$select = "select * from subscribers where list=27 and custom_fields LIKE '%\%" + $c + "\%%'";

// and that's it :)


$export = mysql_query ( $select ) or die ( "Sql error : " . mysql_error( ) );

$fields = mysql_num_fields ( $export );

for ( $i = 0; $i < $fields; $i++ )
{
    $header .= mysql_field_name( $export , $i ) . "\t";
}

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";
}

header("Content-type: application/octet-stream");
header("Content-Disposition: attachment; filename=list-export.xls");
header("Pragma: no-cache");
header("Expires: 0");
print "$header\n$data";
}
?>