php 警告：mysqli_select_db() 需要 2 个参数，1 个在
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/36725982/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
Warning: mysqli_select_db() expects exactly 2 parameters, 1 given in
提问by Steven Surain
im a beginner and also a diploma student... i have created database using localhost... im having problem viewing my database... please help me... i hope u can help me with a full code... this is the ERROR...
我是初学者，也是文凭学生...我已经使用本地主机创建了数据库...我在查看我的数据库时遇到问题...请帮助我...我希望你能帮助我提供完整的代码...这是错误...
Warning: mysqli_select_db() expects exactly 2 parameters, 1 given in C:\xampp\htdocs\SLR\View S110 PC01.php on line 10
cannot select DB
this is my code...
这是我的代码...
<?php
$host="localhost"; // Host name
$username="root"; // Mysql username
$password=""; // Mysql password
$db_name="slr"; // Database name
$tbl_name="s110_pc01"; // Table name
// Connect to server and select databse.
mysqli_connect("$host", "$username", "$password")or die("cannot connect");
mysqli_select_db("$db_name")or die("cannot select DB");
$sql="SELECT * FROM $tbl_name";
$result=mysqli_query($sql);
$count=mysqli_num_rows($result);
?>
<table width="400" border="0" cellspacing="1" cellpadding="0">
<tr>
<td><form name="form1" method="post" action="">
<table width="400" border="0" cellpadding="3" cellspacing="1" bgcolor="#CCCCCC">
<tr>
<td bgcolor="#FFFFFF"> </td>
<td colspan="4" bgcolor="#FFFFFF"><strong>Delete multiple rows in mysql</strong> </td>
</tr>
<tr>
<td align="center" bgcolor="#FFFFFF">#</td>
<td align="center" bgcolor="#FFFFFF"><strong>Software ID</strong></td>
<td align="center" bgcolor="#FFFFFF"><strong>Software Name</strong></td>
<td align="center" bgcolor="#FFFFFF"><strong>Installed Date</strong></td>
<td align="center" bgcolor="#FFFFFF"><strong>Expiry Date</strong></td>
<td align="center" bgcolor="#FFFFFF"><strong>Product Key</strong></td>
</tr>
<?php
while($rows=mysqli_fetch_array($result)){
?>
<tr>
<td align="center" bgcolor="#FFFFFF"><input name="checkbox[]" type="checkbox" id="checkbox[]" value="<? echo $rows['id']; ?>"></td>
<td bgcolor="#FFFFFF"><? echo $rows['soft_id']; ?></td>
<td bgcolor="#FFFFFF"><? echo $rows['soft_name']; ?></td>
<td bgcolor="#FFFFFF"><? echo $rows['installed_date']; ?></td>
<td bgcolor="#FFFFFF"><? echo $rows['expiry_date']; ?></td>
<td bgcolor="#FFFFFF"><? echo $rows['product_key']; ?></td>
</tr>
<?php
}
?>
<tr>
<td colspan="5" align="center" bgcolor="#FFFFFF"><input name="delete" type="submit" id="delete" value="Delete"></td>
</tr>
<?php
// Check if delete button active, start this
if($delete){
for($i=0;$i<$count;$i++){
$del_id = $checkbox[$i];
$sql = "DELETE FROM $tbl_name WHERE soft_id='$soft_id'";
$result = mysqli_query($sql);
}
// if successful redirect to delete_multiple.php
if($result){
echo "<meta http-equiv=\"refresh\" content=\"0;URL=View S110 PC01.php\">";
}
}
mysqli_close();
?>
</table>
</form>
</td>
</tr>
</table>
回答by olibiaz
If you check the php manual here: http://php.net/manual/fr/mysqli.select-db.php
如果您在此处查看 php 手册：http: //php.net/manual/fr/mysqli.select-db.php
You will see the function mysqli_select_dbtake two params in input.
您将看到该函数mysqli_select_db在输入中采用两个参数。
bool mysqli_select_db ( mysqli $link , string $dbname )
bool mysqli_select_db ( mysqli $link , 字符串 $dbname )
So you should have
所以你应该有
// Connect to server and select databse.
$conn = mysqli_connect($host, $username, $password) or die("cannot connect");
mysqli_select_db($conn, $db_name) or die("cannot select DB");
回答by Akilan
You dont need a separate function for select database in mysqli function,
在 mysqli 函数中，您不需要单独的函数来选择数据库，
The below method is more than enough to connect and select the database,
下面的方法足以连接和选择数据库，
// Connect to server and select databse.
$conn = mysqli_connect($host, $username, $password,$db_name)or die("cannot connect");
回答by Pankaj Thakur
In Mysqli you have to pass two parameters.
1) sql Connection
2) sql query
example :
<?php
// Connect to server and select database.
$con=mysqli_connect("$host", "$username",
"$password","$db_name")or die("cannot connect server ");
$name="abc";
$email="[email protected]";
$sql="INSERT INTO $tbl_name(name, email)VALUES('$name','$email')";
$result=mysqli_query($con,$sql);
mysqli_close($con);
?>
