?? ??? PHP ??? ???? MySQL ????? ???? ???? ??
??:
MySQL ???? ??? HTML ???? "??" ??? ??? ??? ??? ??????. ??? ?? ??? ????? ???????? ?? ?? ???? ??? ?? ??? ???? ????.
?? ???:
results.php :
<code class="php">// Fetch data from the database $contacts = mysql_query("SELECT * FROM contacts ORDER BY ID ASC") or die(mysql_error()); // If results exist, display the table if (mysql_num_rows($contacts) > 0) { // Table markup echo '<table id="contact-list">'; // Table head echo '<thead><tr><th>Name</th><th>Email</th><th>Telephone</th><th>Address</th><th>Delete</th></tr></thead>'; // Table body while ($contact = mysql_fetch_array($contacts)) { echo '<tr>'; echo '<td>' . $contact['name'] . '</td>'; echo '<td>' . $contact['email'] . '</td>'; echo '<td>' . $contact['telephone'] . '</td>'; echo '<td>' . $contact['address'] . '</td>'; // Delete form echo '<td><form action="delete.php" method="post">'; echo '<input type="hidden" name="name" value="">'; echo '<input type="submit" name="submit" value="Delete">'; echo '</form></td>'; echo '</tr>'; } // Table foot echo '</table>'; }</code>
delete.php:
<code class="php">// Define the deletion query $query = "DELETE FROM contacts WHERE name={$_POST['name']} LIMIT 1"; // Execute the query mysql_query($query); // Display a success or failure message based on the number of affected rows if (mysql_affected_rows() == 1) { echo '<strong>Contact Has Been Deleted</strong><br /><br />'; } else { echo '<strong>Deletion Failed</strong><br /><br />'; }</code>
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??? ??? ????. ?? ? ?(? ?? ??)? delete.php ????? ?????. ?? ????? ?? ??? ??? ??? ?? ?? URL ????? ?? ?? ???? ???.
????? ??:
<code class="php">// Within the table body loop in results.php echo '<td><form action="delete.php?name=' . $contact['name'] . '" method="post">';</code>
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TOSECIBERYNECTTOEREMOTEMYSQLSERVER, USESSHTUNNENG, CONFIGUREMYSQLFORREMOTEACCESS, SETFIREWALLRULES ? CONSIDERSSLENCRYPTION .First, SpectionANSSHTUNNELWITHSSH-L3307 : LocalHost : 3306user@remote-Server-NandConnectViamySQL-H127.0.1-P3307.second, editmys

MySQL ??? ?? ??? ?? ?? ??? ?? ??? ??????. 1. ?? ?? ?? ?? ???? Slow_Query_Log ? Long_Query_Time; 2. ???? ??? ?? ??? ???? ? ????? query_time, lock_time, rows_examined? ?? ?? ??? ???? ????. 3. ??? ????? ???? ?? mysqldumpslow ?? pt-query idigest ??? ??????. 4. ??? ???? ??? ??, ??*???*, ??? ?? ?? ?? ?????. ?? ??, user_id? ???? ???? ?? ? ?? ?? ?? ??? ?? ???? ???? ? ????.

MySQLDump? MySQL ??????? ??? ??? ???? ???? ?????. ??????? ???? ?? ?? ? ?? ?? ???? SQL ??? ?????. 1. ?? ??? ????? ??? ?????? ??? ???? ??? SQL ???? ?????. 2. ??? ?????? ?? ??? ??? ???? TB ?? ???? ?? ???? ???? ????. 3. ???? ???-single transaction,-databases,-all-databases,-routines ?; 4. MySQL ??? ???? ?? ?? ?? ?? ?? ? ??? ?? ??? ???? ? ????. 5. ??? ????? ????? ?? ? ?? ??? ???? ?? ????.

MySQL?? NULL ?? ?? ? ? 1. ???? ?? ? ? ? ??? NotNull? ???? ?? ??? NULL? ?????. 2. iSnull ?? ISNOTNULL = ??! =; 3. Ifnull ?? Coalesce ??? ????? ???? ???? ? ??? ? ????. 4. ?? ?? ????? NULL ?? ?? ??? ?? ???? ??? ?? ? ORM ??? ?? ?? ?????? ??????. NULL? ???? ?? ?? ???? ??? ???? ?? ?? ?? ????. ??? ???? ??, ?? ? ???? ?? ? ??? ?? ??? ??? ?? ???????. ??? ??? ???? ??? ?? ?? ??? ????? ?? ? ????.

MySQL ?????? ? ???? ??? ??? information_schema? ?? ????? ?? ? ??? ??? ? ????. 1. ?? ?????? ?? ?? : SQL ?? ???? selecttable_schemaas'database ', sum (data_length index_length)/1024/1024as'size (mb) 'frominformation_schema.tablessgroupbytable_schema; ?? ??????? ? ??? ??? ?? ??????? ???? ??? ?? ? ? ????. 2. ?? ??? ??? ?????? : selectta? ??????

?? ?? ? ?? ?? ??? ??? ??? ?????? ?? ??? ??? ?????? ??? ?????? ?????? ??? ?????. ? ?? ?? ???? ????. ??, ??????, ??? ? ??? ?? ??? UTF8MB4? ???? ???? ShowCreatedAtabase/Table? ???? ? Alter ??? ??????. ??, ?????? ??? ? UTF8MB4 ?? ??? ???? ?? ?? ??? ????? SetNames? ??????. ??, ?? ??? ????? ???? UTF8MB4_UNICODE_CI? ???? ?? ? ????? ???? ???? ?????? ???? ?? ? ? ?? ?? ??? ????? ??????.

GroupBy? ???? ???? ????? ?? ??? ???? ? ???? ??? ? ??? ????? ? ?????. ?? ??, GroupByCustomer_ID? ???? ? ??? ? ???? ??? ? ????. ???? ? 1,000 ? ??? ? ??? ??? ?? ? ? ????. ?? ? ? ?? ??? GroupBy? ??????, ?? ?? ?? ???? ???? ??? ??? ? ? ????. ???? ???? ? ??? ? ??, ?? ?? ??? ? ?? ???? ???? ?????.

MySQL? ???? ??? ???? InnoDB ?? ??? ???? ??? ???? ???? ?????. 1. ????? ??? SQL ?? ????, ?? ?? ?? ?? ??? ?????. 2. ? ???? ???, ???, ?? ? ???? ?????. 3. ????? ???? ????? ??? STARTTRANSACTION, CONMING ? ROLLBACK???. 4. 4 ?? ?? ???? ?? ??, ?? ? ??, ?? ??? ?? ? ???? ?????. 5. ????? ???? ???? ?? ??? ??? ?? ??? ?? ?? ? ??? ????? ??????. ??? ????? ?? MySQL? ?? ???? ?? ??? ?? ? ? ????.
