php - i wan to export an excel from mysql database. i want to have the column name from users with the help of check box -

-

this normal csv query. want take column name user input. form containing checkbox or dropdown. how should modify it? have tried checkbox isset($_post["checkboxname"]) not working. me please.

<?php      include("../../../config.php");     //if(isset($_post["submit"])){      $xls_filename = 'export_'.date('y-m-d').'.xls'; // define excel (.xls) file name     $start_date=$_post["date_time"];     $sql_ex = "select device_name,description,card,device_module,uid device";     $result = @mysql_query($sql_ex,$conn) or die("failed execute query:<br />" . mysql_error(). "<br />" . mysql_errno());      // header info settings     header("content-type: application/xls");     header("content-disposition: attachment; filename=$xls_filename");     header("pragma: no-cache");     header("expires: 0");      /***** start of formatting excel *****/     // define separator (defines columns in excel &amp; tabs in word)     $sep = "\t"; // tabbed character      // start of printing column names names of mysql fields     ($i = 0; $i<mysql_num_fields($result); $i++) {       echo mysql_field_name($result, $i) . "\t";     }     print("\n");     // end of printing column names      // start while loop data     while($row = mysql_fetch_row($result))     {       $schema_insert = "";       for($j=0; $j<mysql_num_fields($result); $j++)       {         if(!isset($row[$j])) {           $schema_insert .= "null".$sep;         }         elseif ($row[$j] != "") {           $schema_insert .= "$row[$j]".$sep;         }         else {           $schema_insert .= "".$sep;         }       }       $schema_insert = str_replace($sep."$", "", $schema_insert);       $schema_insert = preg_replace("/\r\n|\n\r|\n|\r/", " ", $schema_insert);       $schema_insert .= "\t";       print(trim($schema_insert));       print "\n";     }      ?>

firstly not excel format. you're making tsv file (and corrupting data removing line break characters). use fputcsv , write straight output, escape data don't have to.

for column selector, set associative array column names keys , user-friendly labels values. use form checkboxes created iterating array, name="columns[]" , value set column name , label echoed next checkbox. in part of script reading received values, first check if isset($_post['columns']) , if each value in posted value array exists in first array. if everything's okay, implode() posted columns use in query.

start off, don't have use post form reads data:

<?php $columns = [     'device_name' => 'device name',     'description' => 'description',     ... ];  // validate if (isset($_get['columns'])) {     if (!is_array($_get['columns'])) {         unset($_get['columns']);     }     else {         foreach ($_get['columns'] $k => $column) {             if (!is_string($column) || !isset($columns[$column])) {                 unset($_get['columns'][$k]);             }         }         if ($_get['columns']) {             $_get['columns'] = array_values($_get['columns']);         }         else {             unset($_get['columns']);         }     } }  // no (valid) column selection if (!isset($_get['columns']) {?>     <form action="">         <?php foreach ($columns $column => $label) {?>             <label><input type=checkbox value="<?php echo $column;?>">                 <?php echo $label;?></label>         <?php }?>     ... <?php } else {     ...     $sql_ex = 'select ' . implode(', ', $_get['columns']) . ' device';     ...     // column headings     fputcsv($output, array_intersect_key($columns, array_flip($_get['columns'])));     // output rows     ... }

Comments

Post a Comment

Popular posts from this blog

Spring Boot + JPA + Hibernate: Unable to locate persister -

-
i trying work entity inside request method of spring boot application. entity in project , pom.xml has dependencies it. why error message?: org.hibernate.unknownentitytypeexception: unable locate persister: com.ric.bill.model.bs.par package com.ric.web; import java.util.concurrent.atomic.atomiclong; import javax.persistence.entitymanager; import javax.persistence.persistencecontext; import net.sf.ehcache.cachemanager; import net.sf.ehcache.management.cache; import net.sf.ehcache.management.cachestatistics; import org.hibernate.stat.statistics; import org.springframework.beans.factory.annotation.autowired; import org.springframework.boot.autoconfigure.domain.entityscan; import org.springframework.cache.annotation.enablecaching; import org.springframework.transaction.annotation.enabletransactionmanagement; import org.springframework.transaction.annotation.propagation; import org.springframework.transaction.annotation.transactional; import org.springframework.web.bind.annotati
Read more

go - Golang: panic: runtime error: invalid memory address or nil pointer dereference using bufio.Scanner -

-
i implementing go program uses bufio.scanner , bufio.writer have packaged code follows package main import ( "fmt" "player/command" "strings" ) func main() { //enter code here. read input stdin. print output stdout commands.scanner.scan() { //scan new line , send comand variable check command exist or not input := strings.split(strings.trim(commands.scanner.text(), " "), " ") command := input[0] if command == "" { fmt.printf("$ %s:", commands.pwd) continue } if !commands.commands[command] { commands.throwerror("cannot recognize input.") } else { commands.execute(command, input[1:], nil) } fmt.printf("$ %s:", commands.pwd) } } i using init.go file in main package follows package main import ( "flag" "player/sourc
Read more

c - double free or corruption (fasttop) -

-
this code reads null terminated string file (file containing null terminated strings & should provide index wanted string). error: *** error in `./main': double free or corruption (fasttop): 0x090a4a80 *** aborted code: char *tmp_realloc=null; char *sstring=null; int i=1; /*set file pointer point string*/ fseek(fh,index,seek_set); sstring=(char*)malloc(sizeof(char)); if(sstring == null) return null; tmp_realloc=sstring; while( (*(sstring+i-1)=(char)fgetc((file*)fh)) != 0x0 ) { /*reallocate more memory*/ tmp_realloc=(char*)realloc((char*)sstring,++i); /*if not same address copy old new & set old point new*/ if(tmp_realloc != sstring){ strcpy((char*)tmp_realloc,(char*)sstring); free(sstring); sstring=tmp_realloc; } } could tell me pointer causing issue (& reason) ? remove part /*if not same address copy old new & set old point new*/ if(tmp_realloc != sstring){ strc
Read more