问题描述
我对收到以下消息的原因感到困惑:
I am confused about why I am received the following message:
mysqli_num_rows() 期望参数 1 为 mysqli_result，给定布尔值
mysqli_num_rows() expects parameter 1 to be mysqli_result, boolean given
这个问题与之前的查询不同，因为我的查询实际上正确执行(确实已将值输入到数据库中).所以，我希望 MySQL 返回一个结果集而不是一个布尔值.
This question is different from previous queries because my query actually executes correctly (values were indeed entered into the database). So, I would expect MySQL to return a result set and NOT A BOOLIAN.
以下是我的功能:
function join_main_newsletter($firstName = null, $email)
{
global $dbc;
$valuesEntered = "values entered";
$insert = "INSERT INTO newsletter (first_name, email ) VALUES ('name', 'testemail@yahoo.com')";
$R3 = mysqli_query($dbc, $insert) or trigger_error("Query Failed! SQL: $sql - Error: " . mysqli_error(db_conx), E_USER_ERROR);
if (mysqli_num_rows($R3) == 1) {
return $valueentered;
} else {
}
}
这是错误的部分结果:
[valuesEntered] => values entered
[insert] => INSERT INTO newsletter (first_name, email )
VALUES ('name', 'testemail@yahoo.com')
[R3] => 1
推荐答案
mysqli_num_rows() 函数返回结果集中的行数.对于插入、更新和删除使用 mysqli_affected_rows
The mysqli_num_rows() function returns the number of rows in a result set. For insert, update and delete use mysqli_affected_rows
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