按年和月获取数据库中的记录

Question

What I have here is a dropdown's that selects records from database by year and month. This works correctly getting year and only 1 month. What I need is get all Januanry to June records or July to December by year. Help?

My date format is yyyy-mm-dd

<form id="form1" name="form1" action="<?php $_SERVER['PHP_SELF']?>" method="post">
<?php
$startYear = 2013;
$curYear = date('Y');
    echo'<select name="year">';
    foreach (range($startYear, $curYear) as $year) {
    echo '<option>'.$year.'</option>';
    }
    echo'</select>';

    echo'<select name="month">';
    for ($x=1; $x<=12; $x++)
    {
    $val=strlen($x);
    if($val==1)
    {
    echo '<option value="'.'0'.$x.'">'.'0'.$x.'</option>';
    } else {
     echo '<option value="'.$x.'">'.$x.'</option>';
    }
    }
    echo'</select>';
?>
<input type="submit" name="date" value="date"/>
</form>

<?php
    $year = $mysqli->real_escape_string($_POST["year"]);
    $month = $mysqli->real_escape_string($_POST["month"]);

    echo $year.'-'.$month;
    $result1 = $mysqli->query("SELECT po_date, rfq, shop, nego, shop, po_number, counter FROM purchase_order WHERE po_date LIKE '$year-$month-__' GROUP BY counter ORDER BY po_date");

Answer 1

If you want to fetch records for a specific month and year, use month and year functions on the date field.

WHERE Year( po_date ) = $year
 and ( Month( po_date ) between 1 and 6    -- for JAN to JUN
       OR
       Month( po_date ) between 7 and 12   -- for JUL to DEC
     )

And the statement

Month( po_date ) between 1 and 6    -- for JAN to JUN
OR
Month( po_date ) between 7 and 12   -- for JUL to DEC

is equivalent to

Month( po_date ) between 1 and 12    -- for JAN to DEC

And hence you should not use both between conditions.
Instead change the lower and upper boundary values of between clause as desired.

Example 1 :
If you want records between april and august , both inclusive, try

Month( po_date ) between 4 and 8    -- for APR to AUG, both inclusive

Example 2 :
If you want records within a specific month, say, 'october', try

Month( po_date ) = 10    -- for OCT

If you still want to use between for a single month output, try

Month( po_date ) between 10 and 10   -- for OCT