How Can I Efficiently Convert MySQL Query Results to CSV in PHP?

Converting MySQL Queries to CSV in PHP: Efficient Methods

Converting MySQL query results into CSV format is a common task in data analysis. In PHP, there are several efficient approaches to achieve this.

Method 1: Using SELECT * INTO OUTFILE

This method utilizes MySQL's built-in SELECT * INTO OUTFILE command. It allows you to directly write the query results to a CSV file.

SELECT * INTO OUTFILE "c:/mydata.csv"
FIELDS TERMINATED BY ',' OPTIONALLY ENCLOSED BY '"'
LINES TERMINATED BY "\n"
FROM my_table;

Method 2: Iterating over Query Results

Another efficient approach is to loop through the query results and manually build the CSV string.

$select = "SELECT * FROM table_name";

$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";
}

Both methods efficiently convert MySQL query results to CSV format in PHP, enabling you to export and analyze data conveniently.

The above is the detailed content of How Can I Efficiently Convert MySQL Query Results to CSV in PHP?. For more information, please follow other related articles on the PHP Chinese website!