我正在使用此代码将一些数据添加到我已经存在的sql数据库中，但似乎无法这样做，它也没有给出任何错误。我已经尝试了所有我能想到的东西。这是一个允许用户输入数据的表单，然后当用户点击提交时，它会在url中给出成功消息，但是我得到了成功消息但数据库中没有数据。
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Signup Form</title>
</head>
<body>
<form action="signup.php" method="POST">
<input type="text" name="firstname" placeholder="First Name">
<br>
<input type="text" name="lastname" placeholder="Last Name">
<br>
<input type="text" name="email" placeholder="E-mail">
<br>
<input type="text" name="uid" placeholder="User name">
<br>
<input type="password" name="pwd" placeholder="Password">
<br>
<button type="submit" name="submit">Sign up</button>
</form>
<?php
$sql = "SELECT * FROM users;" ;
$result = mysqli_query($conn,$sql); //connects the database to the query we just generated
$resultcheck = mysqli_num_rows($result); // it returns the number of rows in the query
if($resultcheck > 0){
//the if condition checks if there is any data inside $resultcheck
//The mysqli_fetch_assoc() function fetches a result row as an associative array.
while($row = mysqli_fetch_assoc($result)){
echo $row['user_uid'].'<br>';
}
}
?>
</body>
</html>
<?php
include_once 'dbh.php';
$firstname = $_POST['firstname'];
$lastname = $_POST['lastname'];
$email = $_POST['email'];
$uid = $_POST['uid'];
$pwd = $_POST['pwd'];
$sql = "INSERT INTO users (`user_firstname`, `user_firstname`, `user_email`, `user_uid`, `user_pwd` ) VALUES (\'$firstname\',\'$lastname\',\'$email\',\'$uid\', \'$pwd\');";
//require 'dbh.php';
mysqli_query('$conn','$sql');
/* if($result=$mysqli->query($sql)){
echo "<p>User successfully added to database</p>".'<br>';
}
else{
echo "Error enterting user into database!".mysql_error().'<br>';
} */
header("Location: index.php?signup=success");
?>
<?php
$dbServername = "localhost";
$dbUsername = "root";
$dbPassword = "";
$dbName = "login_system"; // selecting the database
$conn = mysqli_connect($dbServername,$dbUsername,$dbPassword,$dbName );
//$mysqli = new mysqli('localhost','root',"",$dbName );
if(mysqli_connect_errno()){
printf("connection failed %s\n",mysqli_connect_error());
exit();
}
$mysqli->select_db("login_system");
?>
答案 0 :(得分：1)
请删除$ conn和$ sql中的单引号
mysqli_query($conn, $sql);
。
答案 1 :(得分：0)
$sql = "INSERT INTO `users` (`user_firstname`, `user_lastname`, `user_email`, `user_uid`, `user_pwd` ) VALUES ('".$firstname."', '".$lastname ."', '".$email."', '".$uid."', '".$pwd."');";
$result=mysqli_query('$conn','$sql');
if($result)
{
echo "succsessfuly...";
}
else
{
echo "Not succsessfuly...";
}
答案 2 :(得分：0)
试试这个：
extensions [gis]
globals
[
land-use-map
Senario1N ;; the count of patches senario 1 describes
Senario1L
Senario1A
Senario1B
Senario1I
Senario1R
Senario1W
%landusetypeN ;; the amount patches
%landusetypeL
%landusetypeA
%landusetypeB
%landusetypeI
Atractiveneighbor
]
patches-own
[ Land-use ;; Wat kind og landusetype a patch has
Willingstochange ;; If true a patch would like to change (if true the count of patches has a surplus comparing to the sneario, if false they have a shortage)
atractiveness ;; if a patch type is attractive to change in <1 = yess
]
to setup
clear-all
load-gis ;;load the maps
setup-constants
update-global-variables
update-display
reset-ticks
end
to load-gis ;;load the maps
set land-use-map gis:load-dataset "a_LANDUSE_cellsize5.asc" ;;loads the land use map
gis:set-world-envelope-ds gis:envelope-of land-use-map ;;sets the envelope of the world to match that of the GIS dataset
gis:apply-raster land-use-map Land-use ;;patches in the land-use-map have a specific land-use now
ask patches [
if Land-use = 1 [ set pcolor Green ] ; Green = Nature ;; patches have a certain color now
if Land-use = 2 [ set pcolor red ] ; Dark red = Leisure
if Land-use = 3 [ set pcolor Yellow ] ; Yellow = Agriculture
if Land-use = 4 [ set pcolor brown ] ; brouwn = Buildup
if Land-use = 5 [ set pcolor grey ] ; grey = roads
if Land-use = 6 [ set pcolor pink ] ; pink = industry
if Land-use = 7 [ set pcolor blue ] ; Blue = water
]
resize-world 0 1633 0 780
set-patch-size 1
end
to setup-constants
set Senario1N 49174 ;; the count of patches senario 1 describes
set Senario1L 17871
set Senario1A 569970
set Senario1B 34202
set Senario1I 5540
set Senario1R 34968
set Senario1W 65594
end
to go ;; this asks the model to caculate certain variables defined below
askforchange
caculateWILLingtochange
caculateAtrac
tick
end
to update-display
ask patches
[ if Land-use = 1 [ set pcolor Green ] ;; Green = Nature
if Land-use = 2 [ set pcolor red ] ;; Dark red = Leisure
if Land-use = 3 [ set pcolor yellow ] ;; Yellow = Agriculture
if Land-use = 4 [ set pcolor brown ] ;; brouwn = Buildup
if Land-use = 5 [ set pcolor grey ] ;; grey = roads
if Land-use = 6 [ set pcolor pink ] ;; pink = industry
if Land-use = 7 [ set pcolor blue ] ;; Blue = water
] ;; patches have a certain color now
end
to update-global-variables
if count patches > 0
[ set %landusetypeN (count patches with [ Land-use = 1 ] / count patches) * 100
set %landusetypeL (count patches with [ Land-use = 2 ] / count patches) * 100
set %landusetypeA (count patches with [ Land-use = 3 ] / count patches) * 100
set %landusetypeB (count patches with [ Land-use = 4 ] / count patches) * 100
set %landusetypeI (count patches with [ Land-use = 6 ] / count patches) * 100
]
end
to caculateWILLingtochange
Ask patches [
if count patches with [Land-use = 1] > Senario1N [ ask patches with [ Land-use = 1 ][
set Willingstochange True
] ]
if count patches with [Land-use = 2] > Senario1L [ ask patches with [ Land-use = 2 ][
set Willingstochange True
] ]
if count patches with [Land-use = 3] > Senario1A [ ask patches with [ Land-use = 3 ][
set Willingstochange True
] ]
if count patches with [Land-use = 4] > Senario1B [ ask patches with [ Land-use = 4 ][
set Willingstochange True
] ]
if count patches with [Land-use = 5] > Senario1R [ ask patches with [ Land-use = 5 ][
set Willingstochange True
]]
if count patches with [Land-use = 6] > Senario1I [ ask patches with [ Land-use = 6 ][
set Willingstochange True
]]
if count patches with [Land-use = 7] > Senario1W [ ask patches with [ Land-use = 7 ][
set Willingstochange True
] ] ]
end
to caculateAtrac
Ask patches [
if count patches with [Land-use = 1] > Senario1N [ ask patches with [ Land-use = 1 ][
set atractiveness (count patches with [Land-use = 1]/ Senario1N )
] ]
if count patches with [Land-use = 2] > Senario1L [ ask patches with [ Land-use = 2 ][
set atractiveness (count patches with [Land-use = 2]/ Senario1L )
] ]
if count patches with [Land-use = 3] > Senario1A [ ask patches with [ Land-use = 3 ][
set atractiveness (count patches with [Land-use = 3]/ Senario1A )
] ]
if count patches with [Land-use = 4] > Senario1B [ ask patches with [ Land-use = 4 ][
set atractiveness (count patches with [Land-use = 4]/ Senario1B )
] ]
if count patches with [Land-use = 5] > Senario1R [ ask patches with [ Land-use = 5 ][
set atractiveness (count patches with [Land-use = 5]/ Senario1R )
]]
if count patches with [Land-use = 6] > Senario1I [ ask patches with [ Land-use = 6 ][
set atractiveness (count patches with [Land-use = 6]/ Senario1I )
]]
if count patches with [Land-use = 7] > Senario1W [ ask patches with [ Land-use = 7 ][
set atractiveness (count patches with [Land-use = 7]/ Senario1W )
] ] ]
end
to askforchange
ask patches [
if Willingstochange = true [change] ;; this ask the patches that are willing to change (have a surpuls) to go and change
]
end
to change
ask neighbors with [Willingstochange = false ] [ ;; this asks if the patch had neigbors with a shortage
set Atractiveneighbor min-one-of patches [atractiveness] ;; this asks to give the neigbor with the lowest patchcount/senario ratio
]
ask patches with [Willingstochange = true] [
set Land-use ([Land-use] of Atractiveneighbor) ;; this asks the patches to change their land-use to the land-use of neigbor with the lowest patchcount/senario ratio
]
end
<强> signup.php
<?php
include_once 'dbh.php';
?>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title> Signup Form </title>
</head>
<body>
<form action="signup.php" method="POST">
<input type="text" name="firstname" placeholder="First Name">
<br>
<input type="text" name="lastname" placeholder="Last Name">
<br>
<input type="text" name="email" placeholder="E-mail">
<br>
<input type="text" name="uid" placeholder="User name">
<br>
<input type="password" name="pwd" placeholder="Password">
<br>
<button type="submit" name="submit">Sign up</button>
</form>
<?php
$sql = "SELECT * FROM users; " ;
$result = $mysqli->query($sql); //connects the database to the query we just generated
$resultcheck = $result->num_rows; // it returns the number of rows in the query
if($resultcheck > 0){
while($row = $result->fetch_assoc()){
echo $row['user_uid'].'<br>';
}
}
?>
</body>
</html>
<强> dbh.php
<?php
include_once 'dbh.php';
$firstname = $mysqli->real_escape_string($_POST['firstname']);
$lastname = $mysqli->real_escape_string($_POST['lastname']);
$email = $mysqli->real_escape_string($_POST['email']);
$uid = $mysqli->real_escape_string($_POST['uid']);
$pwd = $mysqli->real_escape_string($_POST['pwd']);
$sql = "INSERT INTO users (`user_firstname`, `user_lastname`, `user_email`, `user_uid`, `user_pwd` ) VALUES ('$firstname','$lastname','$email','$uid', '$pwd');";
if($result=$mysqli->query($sql)){
echo "<p>User successfully added to database</p>".'<br>';
}
else{
echo "Error enterting user into database!".$mysqli->error.'<br>';
}
header("Location: index.php?signup=success");
答案 3 :(得分：-1)
应该是这样的
$sql = "INSERT INTO users (firstname, lastname, email, uid, pwd ) VALUES ('$firstname','$lastname','$email','$uid', '$pwd')";
mysqli_query($conn,$sql);