[英]Mysqli query no result
我在mysqli准备查询中遇到问题,我无法弄清楚出了什么问题。
在phpmyadmin中,我正在编写此查询
SELECT `country_id` FROM `oa_country` WHERE `name` = "Ελλάδα"
我得到了成功的结果。
当我尝试使用mysqli prepare语句执行此操作时,出现错误。
function getCountryId($country) {
print($country); \\prints "Ελλάδα" or anything else, even countries in latin letters.
$db = mysqli_connect(DB_HOSTNAME,DB_USERNAME,DB_PASSWORD,DB_DATABASE);
$result = mysqli_prepare($db, "SELECT `country_id` FROM `oa_country` WHERE `name` = ? ;");
mysqli_stmt_bind_param($result, 's', $country);
mysqli_stmt_execute($result);
mysqli_stmt_bind_result($result, $countcountry);
print_r($result);\\ see below.
while(mysqli_stmt_fetch($result))
{
$countryid = $countcountry;
}
mysqli_stmt_close($result);
mysqli_close($db);
echo $countryid; \\undefined variable countryid
return $countryid;
}
Print $ result打印这些数据。
mysqli_stmt Object
(
[affected_rows] => -1
[insert_id] => 0
[num_rows] => 0
[param_count] => 1
[field_count] => 1
[errno] => 0
[error] =>
[error_list] => Array
(
)
[sqlstate] => 00000
[id] => 1
)
奇怪的是,它曾经可以工作,但是突然间停了下来,我无法解释为什么!
PS所有插入都在使用mysqli + prepare语句。 诸如此类的查询停止工作。
更新1。
我在班级上方记录了此错误
mysqli_report(MYSQLI_REPORT_ERROR | MYSQLI_REPORT_STRICT);
现在我得到这个错误。
Fatal error: Uncaught exception 'mysqli_sql_exception' with message 'Column 'country_id' cannot be null' in /some/url/lib/registerClass.php:49
Stack trace:
#0 /some/url/lib/registerClass.php(49): mysqli_stmt_execute(Object(mysqli_stmt))
#1 /some/url/register.php(34): RegisterLibrary->Address(21267, 'kapa\n', '\xCE\x9D\xCE\xAC\xCF\x84\xCF\x83\xCE\xB9\xCE\xBF\xCF\x82', 'oriste', 'pws', '123123', 'asdasd', '4121sadsa', 'sadas', '13322', '\xCE\x95\xCE\xBB\xCE\xBB\xCE\xAC\xCE\xB4\xCE\xB1', '\xCE\x91\xCF\x84\xCF\x84\xCE\xB9\xCE\xBA\xCE\xAE')
在$db
变量下面,我将字符集设置为utf8。
function getCountryId($country) {
$db = mysqli_connect(DB_HOSTNAME,DB_USERNAME,DB_PASSWORD,DB_DATABASE);
mysqli_set_charset( $db, 'utf8' );
if ($stmt = mysqli_prepare($db, "SELECT country_id FROM oa_country WHERE name=?")) {
/* bind parameters for markers */
mysqli_stmt_bind_param($stmt, "s", $country);
/* execute query */
mysqli_stmt_execute($stmt);
/* bind result variables */
mysqli_stmt_bind_result($stmt, $countryidr);
$thecountryid = $countryidr;
echo $thecountryid; //no echo.
/* fetch value */
mysqli_stmt_fetch($stmt);
/* close statement */
mysqli_stmt_close($stmt);
}
return $thecountryid; //no return.
}
它看起来像字符集问题
尝试设置mysqli_set_charset
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