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Use PHP to implement simple additions, deletions, modifications and queries in the database (pure code, to be improved)

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2016-08-08 09:21:071310browse

<?<span>php
    </span><span>$con</span> = <span>mysql_connect</span>("localhost:3306","root",""<span>);

    </span><span>if</span> (!<span>$con</span><span>) {
        </span><span>die</span>('Could not connect: ' . <span>mysql_error</span><span>());
    }

    </span><span>mysql_select_db</span>("test", <span>$con</span><span>);

    </span><span>$result</span> = <span>mysql_query</span>("SELECT * FROM user"<span>);

    </span><span>echo</span> "<span><table border='1'>
    <tr>
    <th>Username</th>
    <th>Password</th>
    </tr>"<span>;

    </span><span>while</span>(<span>$row</span> = <span>mysql_fetch_array</span>(<span>$result</span><span>)) {
        </span><span>echo</span> "<tr>"<span>;
        </span><span>echo</span> "<td>" . <span>$row</span>['username'] . "</td>"<span>;
        </span><span>echo</span> "<td>" . <span>$row</span>['password'] . "</td>"<span>;
        </span><span>echo</span> "</tr>"<span>;
    }
    </span><span>echo</span> "</table>"<span>;

    </span><span>mysql_close</span>(<span>$con</span><span>);

</span>?>
Get all the user’s information (SQL SELECT statement) from the server and present it in table form

<?<span>php
    </span><span>$con</span> = <span>mysql_connect</span>("localhost","root",""<span>);
    </span><span>if</span> (!<span>$con</span><span>) {
        </span><span>die</span>('Could not connect: ' . <span>mysql_error</span><span>());
    }

    </span><span>mysql_select_db</span>("test", <span>$con</span><span>);

    </span><span>mysql_query</span>("DELETE FROM user WHERE username = '<span>$_POST</span>[username]'"<span>);

    </span><span>mysql_close</span>(<span>$con</span><span>);
</span>?>
Delete all the user’s information delete.php

<?<span>php
    </span><span>$con</span> = <span>mysql_connect</span>("localhost:3306","root",""<span>);

    </span><span>if</span> (!<span>$con</span><span>) {
        </span><span>die</span>('Could not connect: ' . <span>mysql_error</span><span>());
    }

    </span><span>mysql_select_db</span>("test", <span>$con</span><span>);

    </span><span>$sql</span> = "<span>INSERT INTO user (username,password)
    VALUES
    ('</span><span>$_POST</span>[username]','<span>$_POST</span>[password]')"<span>;

    </span><span>if</span> (!<span>mysql_query</span>(<span>$sql</span>,<span>$con</span><span>)) {
        </span><span>die</span>('Error: ' . <span>mysql_error</span><span>());
    }

    </span><span>echo</span> "1 record added"<span>;

    </span><span>mysql_close</span>(<span>$con</span><span>);

</span>?>
Register a new user insert.php

<?<span>php

    </span><span>$con</span> = <span>mysql_connect</span>("localhost","root",""<span>);
    </span><span>if</span> (!<span>$con</span><span>) {
        </span><span>die</span>('Could not connect: ' . <span>mysql_error</span><span>());
    }

    </span><span>mysql_select_db</span>("test", <span>$con</span><span>);

    </span><span>mysql_query</span>("UPDATE user SET password = '<span>$_POST</span>[password]' WHERE username = '<span>$_POST</span>[username]'"<span>);

    </span><span>mysql_close</span>(<span>$con</span><span>);
</span>?>
Change a user password update.php

<html>
    <head>
        <title>用PHP向数据库中实现简单的增删改查</title>
    </head>
    <body>
        <br />
        <h1>Insert:</h1>
        <form action="insert.php" method="post"><span>            username</span>:<input type="name" name="username"/>
            <br /><span>            password</span>:<input type="password" name="password"/>
            <input type="submit" value="submit"/>
        </form>
        <br /><hr /><br />
        <h1>Delete</h1>
        <form action="delete.php" method="post"><span>            username</span>:<input type="name" name="username" />
            <br /><span>            Are you sure</span>?<input type="submit" value="sure" />
        </form>
        <br /><hr /><br />
        <h1>Update</h1>
        <form action="update.php" method="post"><span>            username</span>:<input type="name" name="username"/>
            <br /><span>            You want to change your password into</span>:<input type="password" name="password"/>
            <input type="submit" value="submit"/>
        </form>
        <br /><hr /><br />
    </body>
</html>
Submission source for the above three functions Operate.html

The above introduces the use of PHP to implement simple additions, deletions, modifications and queries in the database (pure code, to be improved), including the relevant content. I hope it will be helpful to friends who are interested in PHP tutorials.

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