How PHP extracts data

Source: Internet
Author: User
How PHP extracts data // Receive data
// Use post for form verification
$ Conn = mysql_connect ('localhost', 'root', 'wampp ');
If (! $ Conn)
Echo "database connection failed". mysql_error ();
Echo "database connection successful ";

// Set the encoding
// Double quotation marks are used.
Mysql_query ("set names 'gbk'") or die (mysql_error ());

// Select a database
Mysql_select_db ('ploy', $ conn) or die ("The cause of the error is". mysql_error ());

$ Id = $ _ POST ['id'];
$ Pwd = $ _ POST ['pwd'];

// Use the database for verification ,,
// Database statement
$ SQL = "select * from admin where id = $ id ";
// Database execution statement
$ Result = mysql_query ($ SQL, $ conn)

// Retrieve the associated array and the password corresponding to the ID number

If ($ row = mysql_fetch_array ($ result ))

{// Query the database and retrieve the database password
If ($ row ['pwd'] = $ pwd)

$ Name = $ row ['name'];
Header ("Location: manage. php? Name = $ name ");
Exit ();
Header ("Location: login. php? Error = 1 ");
Exit ();

?> The above is the code. this is the page code for processing user login. if ($ row = mysql_fetch_assoc ($ result) at runtime, there is no error in the database connection, always report an error. please answer

Reply to discussion (solution)

What is the error?
If the syntax is incorrect
$ Result = mysql_query ($ SQL, $ conn );
If the data type is incorrect
$ Result = mysql_query ($ SQL, $ conn) or die (mysql_error ());

Screenshot to see what is wrong

Post an error,

Incorrect IDE selection

The last and second if brackets are included in the final try

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