???? ?? ? PDO? ?????? ?? ??
????? ?? ??? ??? ???? ?? ?? ????? ??? ?? ???????. MD5? ?? ?? ??? ? ?? ???? ???? ???? ??? ?? ??? ???? ?????.
PDO? ???? ???? ??? ??? ???? ?? ??? ?? ????? ??? ???????. ????? ?? ???? ???? ?? ?? ??? ????? ??? ?? ??????.
PHP ???? ???? ??? ???? ??? ??? ????.
??? ????:
$dbh = new PDO(...); $sql = "SELECT * FROM users WHERE username = :u"; $query = $dbh->prepare($sql); $params = array(":u" => $_POST['username']); $query->execute($params); $results = $query->fetchAll(); if (count($results) > 0) { $firstrow = $results[0]; if (password_verify($_POST['password'], $firstrow['password'])) { // valid login } else { // invalid password } } else { // invalid username }
?? ????:
$dbh = new PDO(...); $username = $_POST["username"]; $email = $_POST["email"]; $password = $_POST["password"]; $hash = password_hash($password, PASSWORD_DEFAULT); // Hash password $stmt = $dbh->prepare("insert into users set username=?, email=?, password=?"); $stmt->execute([$username, $email, $hash]);
password_compat ?? phpass? ?? ?????? ???? ??? ????? ??? ?? ??? ???? ?? ???? ?? ? ????.
???? ??? PDO ??? ???? ?? ?????? ??? ?? ??? ???? ??????? ??? ?? ?????.
? ??? PDO? ???? ??? ??? ?????? ??? ??? ? ????? ?? ?????. ??? ??? PHP ??? ????? ?? ?? ??? ?????!

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MySQL ????? ?? ??? ?? ?????? ????? ???? ???? ?????. ??, ???? ??? ???? ??? ????? ?????. ?? ?? ?? ?? ??? ?????. ?? ??, ?? ? ??? ?? ???? ??? ????? ??? ???? ??????. ??, ???? ????? ??????? ? ??? ???? ?? ??? ?? ? ? ????? ?? ?? ? ???? ?? ????? ?? ??? ??? ??? ?????. ??, ??? ?? ??? ?? ??? ???? ????, ??? ??, ?? ???? ?? ? ??? ??? ?????. MySQL? readuncommitted ? readcommi? ?????.

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

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_

TOSECIBERYNECTTOEREMOTEMYSQLSERVER, USESSHTUNNENG, CONFIGUREMYSQLFORREMOTEACCESS, SETFIREWALLRULES ? CONSIDERSSLENCRYPTION .First, SpectionANSSHTUNNELWITHSSH-L3307 : LocalHost : 3306user@remote-Server-NandConnectViamySQL-H127.0.1-P3307.second, editmys

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? ????.

AconnectionpoolisacacheofdatabaseConnection? ??? ??????

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. ??? ????? ????? ?? ? ?? ??? ???? ?? ????.
