用PHP导出CSV文件

Question

In exporting CSV file using PHP, there are some records that won't be included. It seemed like while transferring, it stopped even if there are still records to be exported. What's the problem?

Answer 1

i have experience several error while exported CSV content to database. most of the problem is because database fail while save record. for example you have data like this :

 "1;me;24"
 "2;you;"
 "3;they;26"
 "4;she;27"
 "5;it;28"

if your database have the constrain the row cannot be null, so the database will throw error to php. and the php will stop loop before the all of record recorded to database.

the solution, you can add exception at your code, when the database fail to insert to database, it will continue the loop until it finish recorded csv to your database.

<?php

error_reporting(E_ERROR);

class MySQLException extends Exception
{
    public function __construct($message,$code=0){                
        parent::__construct($message,$code);
    }
}

class Mysql
{    
    private $_DB_HOST;
    private $_DB_USERNAME;
    private $_DB_PASSWORD;
    private $_DB_NAME;
    private $_DB_SELECT_STATE;

    private $_CONNECTION;

    public function __construct($host, $username, $password, $dbname) {
        $this->_DB_HOST = $host;
        $this->_DB_USERNAME = $username;
        $this->_DB_PASSWORD = $password;
        $this->_DB_NAME = $dbname;

        $this->__connect();
        $this->__select_db();
    }

    private function __connect() {
        $this->_CONNECTION = mysql_connect($this->_DB_HOST, $this->_DB_USERNAME, $this->_DB_PASSWORD);

        if(!$this->_CONNECTION) {            
            throw new MySQLException('Could Not Connect to database with given setting');            
        }
    }

    private function __select_db() {
        $this->_DB_SELECT_STATE = mysql_select_db( $this->_DB_NAME , $this->_CONNECTION);

        if(!$this->_DB_SELECT_STATE) {
            throw new MySQLException('Could Not select to database with given setting');
        }
    }

    public function query($query){
        if( ( $result = mysql_query($query, $this->_CONNECTION )  )) {
            return $result;
        } else {
            $command = explode(' ', trim($query));
            throw new MySQLException('Could not do' . $command . ' query');
        }

    }
}


// connect to database
$database = new Mysql("localhost", "username", "password", "test");

// example your csv file before parsed
$csv = array("1;me;24", "2;you;", "3;they;26", "4;she;27", "5;it;28");

for($i = 0; $i < sizeof($csv); $i++){
    try{
        $row = explode(";", $csv[$i]);        
        $database->query("INSERT INTO testtable (id, name, age) VALUES (".$row[0].", '".$row[1]."', ".$row[2].")");
    } catch (MySQLException $e){
        echo 'We could not insert to the database <br>';
    }
}

if you wasn't add any try catch, your code will stop while inserting the second query

"1;me;24"
"2;you;"
"3;they;26"
"4;she;27"
"5;it;28"

but the code remain loop till end parsing if you catch the exception.