警告：mysqli_select_db（）期望剛好2個參數，1給出

-6

即時通訊初學者，也是一個文憑學生...我已經創建數據庫使用本地...即時通訊有問題查看我的數據庫...請幫助我..我希望你可以幫我一個完整的代碼......這是錯誤...警告：mysqli_select_db（）期望剛好2個參數，1給出

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

這是我的代碼...

<?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">&nbsp;</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>

來源

2016-04-19 Steven Surain

有什麼不清楚的錯誤消息？ –

我不明白先生... –

請不要一遍又一遍地發佈相同的問題。 –

如果您在此處檢查PHP手冊： http://php.net/manual/fr/mysqli.select-db.php

你會看到t他功能mysqli_select_db在輸入中帶兩個參數。

布爾mysqli_select_db（mysqli的$鏈接，串$ DBNAME）

所以，你應該有

// 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");

來源

2016-04-19 18:00:49 olibiaz

你不需要在mysqli的功能選擇數據庫中的一個單獨的函數，

以下方法足以連接和選擇數據庫，

// Connect to server and select databse. 
    $conn = mysqli_connect($host, $username, $password,$db_name)or die("cannot connect");

DOC：http://php.net/manual/en/mysqli.select-db.php

來源

2016-04-19 18:05:22 Akilan

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); 
?>

來源

2016-10-19 01:12:51

警告：mysqli_select_db（）期望剛好2個參數，1給出

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