"Advanced Technology" PHP How to import and export CSV files

We first prepare the MySQL data table, assuming that the project has a record of student information table student, and there are id,name,sex,age to record the student's name, gender, age and other information.

CREATE TABLE ' student ' (   ' id ' int (one) not null auto_increment,   ' name ' varchar (a) ' NOT null,   ' sex ' varchar (10) Not NULL,   ' age ' smallint (3) is not null default ' 0 ',   PRIMARY KEY  (' id ')) engine=myisam  default Charset=utf 8;

We also need an HTML interactive page to place the import form and export button.

<form id= "AddForm" action= "Do.php?action=import" method= "post" enctype= "Multipart/form-data" >     <p> Please select the CSV file to import: <br/><input type= "file" name= "file" > <input type= "Submit"     class= "btn" value= "Import csv" >     <input type= "button" class= "BTN" value= "Export csv" onclick= "window.location.href=" do.php?     Action=export ' "></p> </form>

After selecting a good local CSV file, click Import, submit to Do.php?action=import processing, and click the Export button to request the address Do.php?action=export for data export processing.

Import CSV

Do.php needs to handle the import and export process separately based on the parameters of Get, PHP structure is as follows:

Include_once ("connect.php"); Connect database  $action = $_get[' action '), if ($action = = ' Import ') {//import CSV    //import processing} elseif ($action = = ' export ') {//EXPORT CS V    //Export Processing}

Import CSV process: Verify CSV file legitimacy (this article ignores), open read-in and parse CSV

The fields in the pieces, loop get each field value, and then bulk add to the datasheet, complete.

if ($action = = ' Import ') {//import csv $filename = $_files[' file ' [' Tmp_name ']; if (empty ($filename)) {echo ' Please select the CSV file to import!         ';     Exit     } $handle = fopen ($filename, ' R '); $result = Input_csv ($handle);     Parse csv $len _result = count ($result); if ($len _result==0) {echo ' doesn't have any data!         ';     Exit } for ($i = 1; $i < $len _result; $i + +) {//Loop get each field value $name = Iconv (' gb2312 ', ' utf-8 ', $result [$i][0]);//Chinese to         Code $sex = iconv (' gb2312 ', ' utf-8 ', $result [$i][1]);         $age = $result [$i][2];     $data _values. = "(' $name ', ' $sex ', ' $age '),"; } $data _values = substr ($data _values,0,-1); Remove the last comma fclose ($handle);         Close pointer $query = mysql_query ("INSERT into student (name,sex,age) values $data _values");//Bulk INSERT in the datasheet if ($query) { Echo ' Import succeeded!     '; }else{echo ' Import failed!     '; } }

Note that PHP's own fgetcsv function makes it easy to work with CSV, which allows you to read a line from the file pointer and parse the CSV field. The following function parses the CSV file field and returns it as an array.

function Input_csv ($handle) {     $out = array ();     $n = 0;     while ($data = Fgetcsv ($handle, 10000)) {         $num = count ($data);         for ($i = 0; $i < $num; $i + +) {$out [$n] [             $i] = $data [$i];         }         $n + +;     }     return $out; }

In addition, when importing into a database, we are using bulk inserts instead of inserts, so when you build the SQL statement, you need to handle it a bit, see code.

Export CSV

We know that a CSV file is a plain text file made up of comma separators, which you can open with Excel, with the same effect as the XLS table.

Export CSV processing process: Read the Student information table, circular record building comma-delimited field information, setting header information, export file (download) to local.

... } ElseIf ($action = = ' export ') {//export csv     $result = mysql_query ("SELECT * from student ORDER by ID ASC");     $str = "Name, gender, age \ n";     $str = Iconv (' utf-8 ', ' gb2312 ', $str);     while ($row =mysql_fetch_array ($result)) {         $name = iconv (' utf-8 ', ' gb2312 ', $row [' name ']);//chinese transcoding         $sex = Iconv (' Utf-8 ', ' gb2312 ', $row [' sex ']);         $str. = $name. ",". $sex. ",". $row [' age ']. " \ n "; Separated by a comma of quotation     $filename = Date (' Ymd '). CSV '; Set file name     export_csv ($filename, $STR);//Export}

To export the data locally, the header information needs to be modified, with the following code:

function Export_csv ($filename, $data) {     header ("Content-type:text/csv");     Header ("Content-disposition:attachment;filename=". $filename);     Header (' cache-control:must-revalidate,post-check=0,pre-check=0 ');     Header (' expires:0 ');     Header (' Pragma:public ');     Echo $data; }

Note the import and export process, because we are using a unified UTF-8 encoding, encountered in Chinese characters must remember transcoding, otherwise there may be garbled in the situation.

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