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Dec 09, 2024 pm 08:16 PMMySQL ??????? ?? ??? ? ??? ?? ?? ??
? ????? ?? ??? ?? ??? ? ??? ?? ??? ???? MySQL ??????? ????? ???? ????. ?? ??? ???? ??? ?? ??? ??? ?????.
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? ?? ??? ???? ??? ??? ?????. ?? ??? ???? ?? ???? ???? ??? ?? ??? ??? ??? ??? ?????. ?? ???? ?? ?? ???? ?????.
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? ?? ??? ??????? ???? ??? ???? ???? ????. ??????? ????? ??????? ???? ???? ???? ?????. ?? ?? ???? ??? ??? MySQLi ? mysql_query API? ???? ???? ?? ?????.
?? ??
??? ??? ???? ?? ??? ?? ?? ??? ?????.
- ?? ?? ? ??? ????? ??? ??? ????? ?????? HTML ??? ?????. ?.
- PHP ???? ??? ???? ???? ??? ??? ?? MySQLi? ??? ???? ?????.
- HTML?? ?? ?? ?? ???? ?? ?? ???????? ??? ???? ??? ??? ?????. .
- ?? ???? MySQLi API? ???? ??????.
????? HTML:
<form method="POST"> <input type="hidden" name="item[]" value="cupcake"> <input type="text" name="items" value="cupcake" readonly><br> <b>Price :</b> <span name="price" value="3.00">.00</span><br> Quantity: <input tabindex="1" name="quantity[]" min="0" max="5" type="number" class="quantity" value="1" /><br> <input tabindex="1" name="checkbox[0]" type="checkbox" value="17" /><span>Add to Cart</span></label></div></div></td><br> <input type="hidden" name="item[]" value="cake"> <input type="text" name="items" value="cake" readonly><br> <b>Price :</b> <span name="price" value="20.00">.00</span><br> Quantity: <input tabindex="1" name="quantity[]" min="0" max="5" type="number" class="quantity" value="1" /><br> <input tabindex="1" name="checkbox[1]" type="checkbox" value="20" /><span>Add to Cart</span></label></div></div></td><br> <input type="submit" name = "insertBT"><br> </form>
??? PHP ????:
if(isset($_POST['insertBT'])) { $conn = new mysqli ($servername, $username, $password, $db); if($conn->connect_error) { die ("Connection Failed : " . $conn->connect_error); } else { $stmt = $conn->prepare("INSERT INTO purchases (Product, Quantity, Price) VALUES (?, ?, ?)"); $stmt->bind_param("sis", $name, $quantity, $price); foreach ($_POST['checkbox'] as $i => $price) { $name = $_POST['name'][$i]; $quantity = $_POST['quantity'][$i]; $stmt->execute(); } } }
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? ??? ???? ?? ???? ???? ??? ??? ????? ?? ??? ? ??? ?? ??? ???? MySQL ??????? ????? ????? ??? ?? ????? ?? ?????. ??? ??? PHP ??? ????? ?? ?? ??? ?????!

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MySQL? ? ????? ??? ??? ????? ?? ?? ??? ?? ???????. 1. Windows ??? : MySQL ?? ?????? ? ??? ????? (?? ??? ????? C : \ programfiles \ mysql \ mysqlserverx.x \ bin), "? ???"→ "??"→ "Advanced System ??"→ "?? ??", "??? ??", MySQlb in wors in mysqlb in wors in mysqlb in world in that the the the the the seel worl ?? ????? ?? ???? MySQL? ??????-Version Versification; 2.Macos ? Linux ??? : Bash ??? ?? ~/.bashrc ?? ~/.bash_

MySQL? ?? ???? ?? ??? ??? ? A??, ?? MVCC ? GAP ?? ??? ?? ??? ?? ? ?? ???? ??? ???? ???? ?? ?? ??? ????. ?? ?? ??? ??? ?? (??)? ????? ??? ??? ????? ?? ?? ??? ????? 1. ??? ??? (read committed)? ?? ? ???? ?? ? ??? ?? ? ??? ?? ? ?? ?? ?? ?? ? ? ????. ???, ??? ??? ????? ??? ??;

mysqlworkbench? ??? ?? ??? ?? ??? ?????. ?? ??? ?? ??? ?? ????. 1. Windows ???? %appdata %\ mysql \ workbench \ connections.xml? ????. 2. MacOS ???? ~/Library/ApplicationSupport/MySQL/Workbench/Connections.xml? ????. 3. ????? Linux ???? ~/.mysql/workbench/connections.xml ?? ~/.local/share/data/mysql/wor? ????.

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

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

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

MySQL? ?? ????? ?????? ?? ??? ?????. 1. MySQL ?? ??, sudosystemctlstopmysql ?? sudosystemctlstopmysqld? ??????. 2. -skip-grant-tables ???? mysql? ???? sudomysqld-skip-grant-tables &; 3. MySQL? ????? ?? SQL ??? ???? FlushPrivileges; Alteruser'Root '@'localHost'IndifiedBy'Your_new? ?? ??? ?? ????? ??????.
