[英]Mysqli error with bind_param(): Number of elements in type definition string doesn't match number of bind variables
I tried what I could to solve this error without any success. 我尽力解决此错误,但没有成功。 I'm trying to dynamically build a select query with prepared statement :
我正在尝试使用准备好的语句动态构建选择查询:
I've got this code 我有这个代码
<?php
$gm = $_GET['gm'];
$ct = $_GET['ct'];
$query = 'SELECT * FROM fchar';
$cond = array();
$params = array();
$type = array();
if (!empty($gm)) {
$cond[] = "gm = ?";
$params[] = $gm;
$type[] = "i";
}
if (!empty($ct)) {
$cond[] = "ct = ?";
$params[] = $ct;
$type[] = "s";
}
if (count($cond)) {
$query .= ' WHERE ' . implode(' AND ', $cond);
}
if (count($params)) {
$paramok = implode(', ', $params);
}
if (count($type)) {
$typeok = implode($type);
}
$stmt = $connection->prepare($query);
$stmt->bind_param(''.$typeok.'',$paramok);
$stmt->execute();
if (!$stmt->execute()) {
echo "Execute failed: (" . $stmt->errno . ") " . $stmt->error;
}
while ($stmt->fetch()) {
}
}
?>
I've got this error : 我有这个错误:
Warning: mysqli_stmt::bind_param(): Number of elements in type definition string doesn't match number of bind variables in C:\\xampp\\htdocs\\cebusingles\\search.php on line 42 警告:mysqli_stmt :: bind_param():类型定义字符串中的元素数量与第42行的C:\\ xampp \\ htdocs \\ cebusingles \\ search.php中的绑定变量数量不匹配
But when I echo the types and params, I've got this : 但是,当我回应类型和参数时,我得到了:
echo "<br><br>Types : ".$typeok."<br>Param: ".$paramok."<br><br>Query: ".$query."<br><br>";
// gives :
// Types : is
// Param: 1, USA
// Query: SELECT * FROM fchar WHERE gm = ? AND ct = ?
So i have 2 types : is, and 2 param : 1, USA. 所以我有2种类型:is和2 param:1,美国。
I don't understand why it says that the number of types is not matching the number of params... Any clue ? 我不明白为什么它说类型的数量与参数的数量不匹配...任何线索? Thank you !
谢谢 !
$stmt->bind_param(''.$typeok.'',$paramok);
Is missing what type of variabled you're trying to insert on the ? 缺少要在上插入哪种类型的变量? places
地方
$stmt->bind_param('ss', ''.$typeok.'', $paramok);
You can read here what characters should be used when using numbers, strings or such: 您可以在此处阅读使用数字,字符串等时应使用哪些字符:
http://php.net/manual/en/mysqli-stmt.bind-param.php http://php.net/manual/en/mysqli-stmt.bind-param.php
types
类型
A string that contains one or more characters which specify the types for the corresponding bind variables:
一个包含一个或多个字符的字符串,这些字符指定相应绑定变量的类型:
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