Proof-of-concept PDO MySQL driver

- Configuration options were added
- Non-transactional locking was added to the savepoint handlers
- Tests were adjusted for MySQL's reserved words

lib/AbstractException.php

@@ -55,6 +55,7 @@ abstract class AbstractException extends \Exception {
         "Db/ExceptionInput.circularDependence"        => 10238,
         "Db/ExceptionInput.subjectMissing"            => 10239,
         "Db/ExceptionTimeout.general"                 => 10241,
+        "Db/ExceptionTimeout.logicalLock"             => 10241,
         "Conf/Exception.fileMissing"                  => 10301,
         "Conf/Exception.fileUnusable"                 => 10302,
         "Conf/Exception.fileUnreadable"               => 10303,

lib/Conf.php

@@ -43,6 +43,16 @@ class Conf {
     public $dbPostgreSQLSchema      = "";
     /** @var string Service file entry to use (if using PostgreSQL); if using a service entry all above parameters except schema are ignored */
     public $dbPostgreSQLService     = "";
+    /** @var string Host name, address, or socket path of MySQL/MariaDB database server (if using MySQL/MariaDB) */
+    public $dbMySQLHost             = "localhost";
+    /** @var string Log-in user name for MySQL/MariaDB database server (if using MySQL/MariaDB) */
+    public $dbMySQLUser             = "arsse";
+    /** @var string Log-in password for MySQL/MariaDB database server (if using MySQL/MariaDB) */
+    public $dbMySQLPass             = "";
+    /** @var integer Listening port for MySQL/MariaDB database server (if using MySQL/MariaDB over TCP) */
+    public $dbMySQLPort             = 3306;
+    /** @var string Database name on MySQL/MariaDB database server (if using MySQL/MariaDB) */
+    public $dbMySQLDb               = "arsse";
 
     /** @var string Class of the user management driver in use (Internal by default) */
     public $userDriver              = User\Internal\Driver::class;

lib/Db/AbstractDriver.php

@@ -75,8 +75,13 @@ abstract class AbstractDriver implements Driver {
             $this->lock();
             $this->locked = true;
         }
-        // create a savepoint, incrementing the transaction depth
-        $this->exec("SAVEPOINT arsse_".(++$this->transDepth));
+        if ($this->locked && static::TRANSACTIONAL_LOCKS == false) {
+            // if locks are not compatible with transactions (and savepoints), don't actually create a savepoint)
+            $this->transDepth++;
+        } else {
+            // create a savepoint, incrementing the transaction depth
+            $this->exec("SAVEPOINT arsse_".(++$this->transDepth));
+        }
         // set the state of the newly created savepoint to pending
         $this->transStatus[$this->transDepth] = self::TR_PEND;
         // return the depth number
@@ -89,8 +94,13 @@ abstract class AbstractDriver implements Driver {
         if (array_key_exists($index, $this->transStatus)) {
             switch ($this->transStatus[$index]) {
                 case self::TR_PEND:
-                    // release the requested savepoint and set its state to committed
-                    $this->exec("RELEASE SAVEPOINT arsse_".$index);
+                    if ($this->locked && static::TRANSACTIONAL_LOCKS == false) {
+                        // if locks are not compatible with transactions, do nothing
+                    } else {
+                        // release the requested savepoint
+                        $this->exec("RELEASE SAVEPOINT arsse_".$index);
+                    }
+                    // set its state to committed
                     $this->transStatus[$index] = self::TR_COMMIT;
                     // for any later pending savepoints, set their state to implicitly committed
                     $a = $index;
@@ -142,8 +152,14 @@ abstract class AbstractDriver implements Driver {
         if (array_key_exists($index, $this->transStatus)) {
             switch ($this->transStatus[$index]) {
                 case self::TR_PEND:
-                    $this->exec("ROLLBACK TRANSACTION TO SAVEPOINT arsse_".$index);
-                    $this->exec("RELEASE SAVEPOINT arsse_".$index);
+                    if ($this->locked && static::TRANSACTIONAL_LOCKS == false) {
+                        // if locks are not compatible with transactions, do nothing and report failure as a rollback cannot occur
+                        $out = false;
+                    } else {
+                        // roll back and then erase the savepoint
+                        $this->exec("ROLLBACK TO SAVEPOINT arsse_".$index);
+                        $this->exec("RELEASE SAVEPOINT arsse_".$index);
+                    }
                     $this->transStatus[$index] = self::TR_ROLLBACK;
                     $a = $index;
                     while (++$a && $a <= $this->transDepth) {
@@ -151,7 +167,7 @@ abstract class AbstractDriver implements Driver {
                             $this->transStatus[$a] = self::TR_PEND_ROLLBACK;
                         }
                     }
-                    $out = true;
+                    $out = $out ?? true;
                     break;
                 case self::TR_PEND_COMMIT:
                     $this->transStatus[$index] = self::TR_ROLLBACK;

lib/Db/MySQL/Driver.php

@@ -0,0 +1,163 @@
+<?php
+/** @license MIT
+ * Copyright 2017 J. King, Dustin Wilson et al.
+ * See LICENSE and AUTHORS files for details */
+
+declare(strict_types=1);
+namespace JKingWeb\Arsse\Db\MySQL;
+
+use JKingWeb\Arsse\Arsse;
+use JKingWeb\Arsse\Conf;
+use JKingWeb\Arsse\Db\Exception;
+use JKingWeb\Arsse\Db\ExceptionInput;
+use JKingWeb\Arsse\Db\ExceptionTimeout;
+
+class Driver extends \JKingWeb\Arsse\Db\AbstractDriver {
+    const SQL_MODE = "ANSI_QUOTES,HIGH_NOT_PRECEDENCE,NO_BACKSLASH_ESCAPES,NO_ENGINE_SUBSTITUTION,ONLY_FULL_GROUP_BY,PIPES_AS_CONCAT,STRICT_ALL_TABLES";
+    const TRANSACTIONAL_LOCKS = false;
+
+    protected $db;
+    protected $transStart = 0;
+
+    public function __construct() {
+        // check to make sure required extension is loaded
+        if (!static::requirementsMet()) {
+            throw new Exception("extMissing", static::driverName()); // @codeCoverageIgnore
+        }
+        $host = Arsse::$conf->dbMySQLHost;
+        if ($host[0] == "/") {
+            // host is a socket
+            $socket = $host;
+            $host = "";
+        } elseif(substr($host, 0, 9) == "\\\\.\\pipe\\") {
+            // host is a Windows named piple
+            $socket = substr($host, 10);
+            $host = "";
+        }
+        $user = Arsse::$conf->dbMySQLUser ?? "";
+        $pass = Arsse::$conf->dbMySQLPass ?? "";
+        $port = Arsse::$conf->dbMySQLPost ?? 3306;
+        $db = Arsse::$conf->dbMySQLDb ?? "arsse";
+        $this->makeConnection($user, $pass, $db, $host, $port, $socket ?? "");
+        $this->exec("SET lock_wait_timeout = 1");
+    }
+
+    /** @codeCoverageIgnore */
+    public static function create(): \JKingWeb\Arsse\Db\Driver {
+        if (self::requirementsMet()) {
+            return new self;
+        } elseif (PDODriver::requirementsMet()) {
+            return new PDODriver;
+        } else {
+            throw new Exception("extMissing", self::driverName());
+        }
+    }
+
+    public static function schemaID(): string {
+        return "MySQL";
+    }
+
+    public function charsetAcceptable(): bool {
+        return true;
+    }
+
+    public function schemaVersion(): int {
+        if ($this->query("SELECT count(*) from information_schema.tables where table_name = 'arsse_meta'")->getValue()) {
+            return (int) $this->query("SELECT value from arsse_meta where `key` = 'schema_version'")->getValue();
+        } else {
+            return 0;
+        }
+    }
+
+    public function sqlToken(string $token): string {
+        switch (strtolower($token)) {
+            case "nocase":
+                return '"utf8mb4_unicode_nopad_ci"';
+            default:
+                return $token;
+        }
+    }
+
+    public function savepointCreate(bool $lock = false): int {
+        if (!$this->transStart && !$lock) {
+            $this->exec("BEGIN");
+            $this->transStart = parent::savepointCreate($lock);
+            return $this->transStart;
+        } else {
+            return parent::savepointCreate($lock);
+        }
+    }
+
+    public function savepointRelease(int $index = null): bool {
+        $index = $index ?? $this->transDepth;
+        $out = parent::savepointRelease($index);
+        if ($index == $this->transStart) {
+            $this->exec("COMMIT");
+            $this->transStart = 0;
+        }
+        return $out;
+    }
+
+    public function savepointUndo(int $index = null): bool {
+        $index = $index ?? $this->transDepth;
+        $out = parent::savepointUndo($index);
+        if ($index == $this->transStart) {
+            $this->exec("ROLLBACK");
+            $this->transStart = 0;
+        }
+        return $out;
+    }
+
+    protected function lock(): bool {
+        $tables = $this->query("SELECT table_name as name from information_schema.tables where table_schema = database() and table_name like 'arsse_%'")->getAll();
+        if ($tables) {
+            $tables = array_column($tables, "name");
+            $tables = array_map(function($table) {
+                $table = str_replace('"', '""', $table);
+                return "\"$table\" write";
+            }, $tables);
+            $tables = implode(", ", $tables);
+            try {
+                $this->exec("SET lock_wait_timeout = 1; LOCK TABLES $tables");
+            } finally {
+                $this->exec("SET lock_wait_timeout = 0");
+            }
+        }
+        return true;
+    }
+
+    protected function unlock(bool $rollback = false): bool {
+        $this->exec("UNLOCK TABLES");
+        return true;
+    }
+
+    public function __destruct() {
+        if (isset($this->db)) {
+            $this->db->close();
+            unset($this->db);
+        }
+    }
+
+    public static function driverName(): string {
+        return Arsse::$lang->msg("Driver.Db.MySQL.Name");
+    }
+
+    public static function requirementsMet(): bool {
+        return false;
+    }
+
+    protected function makeConnection(string $db, string $user, string $password, string $host, int $port, string $socket) {
+    }
+
+    protected function getError(): string {
+    }
+
+    public function exec(string $query): bool {
+    }
+
+    public function query(string $query): \JKingWeb\Arsse\Db\Result {
+    }
+
+    public function prepareArray(string $query, array $paramTypes): \JKingWeb\Arsse\Db\Statement {
+    }
+}

lib/Db/MySQL/PDODriver.php

@@ -0,0 +1,59 @@
+<?php
+/** @license MIT
+ * Copyright 2017 J. King, Dustin Wilson et al.
+ * See LICENSE and AUTHORS files for details */
+
+declare(strict_types=1);
+namespace JKingWeb\Arsse\Db\MySQL;
+
+use JKingWeb\Arsse\Arsse;
+use JKingWeb\Arsse\Db\Exception;
+use JKingWeb\Arsse\Db\ExceptionInput;
+use JKingWeb\Arsse\Db\ExceptionTimeout;
+
+class PDODriver extends Driver {
+    use \JKingWeb\Arsse\Db\PDODriver;
+
+    protected $db;
+
+    public static function requirementsMet(): bool {
+        return class_exists("PDO") && in_array("mysql", \PDO::getAvailableDrivers());
+    }
+
+    protected function makeConnection(string $db, string $user, string $password, string $host, int $port, string $socket) {
+        $dsn = [];
+        $dsn[] = "charset=utf8mb4";
+        $dsn[] = "dbname=$db";
+        if (strlen($host)) {
+            $dsn[] = "host=$host";
+            $dsn[] = "port=$port";
+        } elseif (strlen($socket)) {
+            $dsn[] = "socket=$socket";
+        }
+        $dsn = "mysql:".implode(";", $dsn);
+        $this->db = new \PDO($dsn, $user, $password, [
+            \PDO::ATTR_ERRMODE => \PDO::ERRMODE_EXCEPTION,
+            \PDO::MYSQL_ATTR_INIT_COMMAND => "SET sql_mode = '".self::SQL_MODE."'",
+        ]);
+    }
+
+    public function __destruct() {
+        unset($this->db);
+    }
+
+    /** @codeCoverageIgnore */
+    public static function create(): \JKingWeb\Arsse\Db\Driver {
+        if (self::requirementsMet()) {
+            return new self;
+        } elseif (Driver::requirementsMet()) {
+            return new Driver;
+        } else {
+            throw new Exception("extMissing", self::driverName());
+        }
+    }
+
+
+    public static function driverName(): string {
+        return Arsse::$lang->msg("Driver.Db.MySQLPDO.Name");
+    }
+}

lib/Db/PDOError.php

@@ -6,6 +6,8 @@
 declare(strict_types=1);
 namespace JKingWeb\Arsse\Db;
 
+use JKingWeb\Arsse\Db\SQLite3\Driver as SQLite3;
+
 trait PDOError {
     public function exceptionBuild(bool $statementError = null): array {
         if ($statementError ?? ($this instanceof Statement)) {
@@ -14,6 +16,7 @@ trait PDOError {
             $err = $this->db->errorInfo();
         }
         switch ($err[0]) {
+            case "22007":
             case "22P02":
             case "42804":
                 return [ExceptionInput::class, 'engineTypeViolation', $err[2]];
@@ -29,18 +32,22 @@ trait PDOError {
                 switch ($this->db->getAttribute(\PDO::ATTR_DRIVER_NAME)) {
                     case "sqlite":
                         switch ($err[1]) {
-                            case \JKingWeb\Arsse\Db\SQLite3\Driver::SQLITE_BUSY:
+                            case SQLite3::SQLITE_BUSY:
                                 return [ExceptionTimeout::class, 'general', $err[2]];
-                            case \JKingWeb\Arsse\Db\SQLite3\Driver::SQLITE_MISMATCH:
+                            case SQLite3::SQLITE_MISMATCH:
                                 return [ExceptionInput::class, 'engineTypeViolation', $err[2]];
-                            default:
-                                return [Exception::class, "engineErrorGeneral", $err[1]." - ".$err[2]];
                         }
-                        // no break
-                    default:
-                        return [Exception::class, "engineErrorGeneral", $err[2]]; // @codeCoverageIgnore
+                        break;
+                    case "mysql":
+                        switch ($err[1]) {
+                            case 1205:
+                                return [ExceptionTimeout::class, 'general', $err[2]];
+                            case 1364:
+                                return [ExceptionInput::class, "constraintViolation", $err[2]];
+                        }
+                        break;
                 }
-                // no break
+                return [Exception::class, "engineErrorGeneral", $err[0]."/".$err[1].": ".$err[2]]; // @codeCoverageIgnore
             default:
                 return [Exception::class, "engineErrorGeneral", $err[0].": ".$err[2]]; // @codeCoverageIgnore
         }

lib/Db/PostgreSQL/Driver.php

@@ -15,6 +15,8 @@ use JKingWeb\Arsse\Db\ExceptionTimeout;
 class Driver extends \JKingWeb\Arsse\Db\AbstractDriver {
     use Dispatch;
 
+    const TRANSACTIONAL_LOCKS = true;
+
     protected $db;
     protected $transStart = 0;
 

lib/Db/SQLite3/Driver.php

@@ -14,6 +14,8 @@ use JKingWeb\Arsse\Db\ExceptionTimeout;
 class Driver extends \JKingWeb\Arsse\Db\AbstractDriver {
     use ExceptionBuilder;
 
+    const TRANSACTIONAL_LOCKS = true;
+
     const SQLITE_BUSY = 5;
     const SQLITE_CONSTRAINT = 19;
     const SQLITE_MISMATCH = 20;

locale/en.php

@@ -22,6 +22,8 @@ return [
     'Driver.Db.SQLite3PDO.Name'                                            => 'SQLite 3 (PDO)',
     'Driver.Db.PostgreSQL.Name'                                            => 'PostgreSQL',
     'Driver.Db.PostgreSQLPDO.Name'                                         => 'PostgreSQL (PDO)',
+    'Driver.Db.MySQL.Name'                                                 => 'MySQL/MariaDB',
+    'Driver.Db.MySQLPDO.Name'                                              => 'MySQL/MariaDB (PDO)',
     'Driver.Service.Curl.Name'                                             => 'HTTP (curl)',
     'Driver.Service.Internal.Name'                                         => 'Internal',
     'Driver.User.Internal.Name'                                            => 'Internal',
@@ -163,6 +165,7 @@ return [
     'Exception.JKingWeb/Arsse/Db/ExceptionInput.engineConstraintViolation' => '{0}',
     'Exception.JKingWeb/Arsse/Db/ExceptionInput.engineTypeViolation'       => '{0}',
     'Exception.JKingWeb/Arsse/Db/ExceptionTimeout.general'                 => '{0}',
+    'Exception.JKingWeb/Arsse/Db/ExceptionTimeout.logicalLock'             => 'Database is locked',
     'Exception.JKingWeb/Arsse/User/Exception.alreadyExists'                => 'Could not perform action "{action}" because the user {user} already exists',
     'Exception.JKingWeb/Arsse/User/Exception.doesNotExist'                 => 'Could not perform action "{action}" because the user {user} does not exist',
     'Exception.JKingWeb/Arsse/User/Exception.authMissing'                  => 'Please log in to proceed',

tests/cases/Db/BaseDriver.php

@@ -11,6 +11,7 @@ use JKingWeb\Arsse\Db\Result;
 use JKingWeb\Arsse\Test\DatabaseInformation;
 
 abstract class BaseDriver extends \JKingWeb\Arsse\Test\AbstractTest {
+    protected static $insertDefaultValues = "INSERT INTO arsse_test default values";
     protected static $dbInfo;
     protected static $interface;
     protected $drv;
@@ -39,8 +40,8 @@ abstract class BaseDriver extends \JKingWeb\Arsse\Test\AbstractTest {
         }
         // completely clear the database and ensure the schema version can easily be altered
         (static::$dbInfo->razeFunction)(static::$interface, [
-            "CREATE TABLE arsse_meta(key varchar(255) primary key not null, value text)",
-            "INSERT INTO arsse_meta(key,value) values('schema_version','0')",
+            "CREATE TABLE arsse_meta(\"key\" varchar(255) primary key not null, value text)",
+            "INSERT INTO arsse_meta(\"key\",value) values('schema_version','0')",
         ]);
         // construct a fresh driver for each test
         $this->drv = new static::$dbInfo->driverClass;
@@ -115,14 +116,13 @@ abstract class BaseDriver extends \JKingWeb\Arsse\Test\AbstractTest {
         $this->exec($this->create);
         $this->exec($this->lock);
         $this->assertException("general", "Db", "ExceptionTimeout");
-        $lock = is_array($this->lock) ? implode("; ", $this->lock) : $this->lock;
-        $this->drv->exec($lock);
+        $this->drv->exec("INSERT INTO arsse_meta(\"key\", value) values('lock', '1')");
     }
 
     public function testExecConstraintViolation() {
         $this->drv->exec("CREATE TABLE arsse_test(id varchar(255) not null)");
         $this->assertException("constraintViolation", "Db", "ExceptionInput");
-        $this->drv->exec("INSERT INTO arsse_test default values");
+        $this->drv->exec(static::$insertDefaultValues);
     }
 
     public function testExecTypeViolation() {
@@ -140,18 +140,10 @@ abstract class BaseDriver extends \JKingWeb\Arsse\Test\AbstractTest {
         $this->drv->query("Apollo was astonished; Dionysus thought me mad");
     }
 
-    public function testQueryTimeout() {
-        $this->exec($this->create);
-        $this->exec($this->lock);
-        $this->assertException("general", "Db", "ExceptionTimeout");
-        $lock = is_array($this->lock) ? implode("; ", $this->lock) : $this->lock;
-        $this->drv->exec($lock);
-    }
-
     public function testQueryConstraintViolation() {
         $this->drv->exec("CREATE TABLE arsse_test(id integer not null)");
         $this->assertException("constraintViolation", "Db", "ExceptionInput");
-        $this->drv->query("INSERT INTO arsse_test default values");
+        $this->drv->query(static::$insertDefaultValues);
     }
 
     public function testQueryTypeViolation() {
@@ -220,23 +212,21 @@ abstract class BaseDriver extends \JKingWeb\Arsse\Test\AbstractTest {
 
     public function testBeginATransaction() {
         $select = "SELECT count(*) FROM arsse_test";
-        $insert = "INSERT INTO arsse_test default values";
         $this->drv->exec($this->create);
         $tr = $this->drv->begin();
-        $this->drv->query($insert);
+        $this->drv->query(static::$insertDefaultValues);
         $this->assertEquals(1, $this->drv->query($select)->getValue());
         $this->assertEquals(0, $this->query($select));
-        $this->drv->query($insert);
+        $this->drv->query(static::$insertDefaultValues);
         $this->assertEquals(2, $this->drv->query($select)->getValue());
         $this->assertEquals(0, $this->query($select));
     }
 
     public function testCommitATransaction() {
         $select = "SELECT count(*) FROM arsse_test";
-        $insert = "INSERT INTO arsse_test default values";
         $this->drv->exec($this->create);
         $tr = $this->drv->begin();
-        $this->drv->query($insert);
+        $this->drv->query(static::$insertDefaultValues);
         $this->assertEquals(1, $this->drv->query($select)->getValue());
         $this->assertEquals(0, $this->query($select));
         $tr->commit();
@@ -246,10 +236,9 @@ abstract class BaseDriver extends \JKingWeb\Arsse\Test\AbstractTest {
 
     public function testRollbackATransaction() {
         $select = "SELECT count(*) FROM arsse_test";
-        $insert = "INSERT INTO arsse_test default values";
         $this->drv->exec($this->create);
         $tr = $this->drv->begin();
-        $this->drv->query($insert);
+        $this->drv->query(static::$insertDefaultValues);
         $this->assertEquals(1, $this->drv->query($select)->getValue());
         $this->assertEquals(0, $this->query($select));
         $tr->rollback();
@@ -259,28 +248,26 @@ abstract class BaseDriver extends \JKingWeb\Arsse\Test\AbstractTest {
 
     public function testBeginChainedTransactions() {
         $select = "SELECT count(*) FROM arsse_test";
-        $insert = "INSERT INTO arsse_test default values";
         $this->drv->exec($this->create);
         $tr1 = $this->drv->begin();
-        $this->drv->query($insert);
+        $this->drv->query(static::$insertDefaultValues);
         $this->assertEquals(1, $this->drv->query($select)->getValue());
         $this->assertEquals(0, $this->query($select));
         $tr2 = $this->drv->begin();
-        $this->drv->query($insert);
+        $this->drv->query(static::$insertDefaultValues);
         $this->assertEquals(2, $this->drv->query($select)->getValue());
         $this->assertEquals(0, $this->query($select));
     }
 
     public function testCommitChainedTransactions() {
         $select = "SELECT count(*) FROM arsse_test";
-        $insert = "INSERT INTO arsse_test default values";
         $this->drv->exec($this->create);
         $tr1 = $this->drv->begin();
-        $this->drv->query($insert);
+        $this->drv->query(static::$insertDefaultValues);
         $this->assertEquals(1, $this->drv->query($select)->getValue());
         $this->assertEquals(0, $this->query($select));
         $tr2 = $this->drv->begin();
-        $this->drv->query($insert);
+        $this->drv->query(static::$insertDefaultValues);
         $this->assertEquals(2, $this->drv->query($select)->getValue());
         $this->assertEquals(0, $this->query($select));
         $tr2->commit();
@@ -291,14 +278,13 @@ abstract class BaseDriver extends \JKingWeb\Arsse\Test\AbstractTest {
 
     public function testCommitChainedTransactionsOutOfOrder() {
         $select = "SELECT count(*) FROM arsse_test";
-        $insert = "INSERT INTO arsse_test default values";
         $this->drv->exec($this->create);
         $tr1 = $this->drv->begin();
-        $this->drv->query($insert);
+        $this->drv->query(static::$insertDefaultValues);
         $this->assertEquals(1, $this->drv->query($select)->getValue());
         $this->assertEquals(0, $this->query($select));
         $tr2 = $this->drv->begin();
-        $this->drv->query($insert);
+        $this->drv->query(static::$insertDefaultValues);
         $this->assertEquals(2, $this->drv->query($select)->getValue());
         $this->assertEquals(0, $this->query($select));
         $tr1->commit();
@@ -308,14 +294,13 @@ abstract class BaseDriver extends \JKingWeb\Arsse\Test\AbstractTest {
 
     public function testRollbackChainedTransactions() {
         $select = "SELECT count(*) FROM arsse_test";
-        $insert = "INSERT INTO arsse_test default values";
         $this->drv->exec($this->create);
         $tr1 = $this->drv->begin();
-        $this->drv->query($insert);
+        $this->drv->query(static::$insertDefaultValues);
         $this->assertEquals(1, $this->drv->query($select)->getValue());
         $this->assertEquals(0, $this->query($select));
         $tr2 = $this->drv->begin();
-        $this->drv->query($insert);
+        $this->drv->query(static::$insertDefaultValues);
         $this->assertEquals(2, $this->drv->query($select)->getValue());
         $this->assertEquals(0, $this->query($select));
         $tr2->rollback();
@@ -328,14 +313,13 @@ abstract class BaseDriver extends \JKingWeb\Arsse\Test\AbstractTest {
 
     public function testRollbackChainedTransactionsOutOfOrder() {
         $select = "SELECT count(*) FROM arsse_test";
-        $insert = "INSERT INTO arsse_test default values";
         $this->drv->exec($this->create);
         $tr1 = $this->drv->begin();
-        $this->drv->query($insert);
+        $this->drv->query(static::$insertDefaultValues);
         $this->assertEquals(1, $this->drv->query($select)->getValue());
         $this->assertEquals(0, $this->query($select));
         $tr2 = $this->drv->begin();
-        $this->drv->query($insert);
+        $this->drv->query(static::$insertDefaultValues);
         $this->assertEquals(2, $this->drv->query($select)->getValue());
         $this->assertEquals(0, $this->query($select));
         $tr1->rollback();
@@ -348,14 +332,13 @@ abstract class BaseDriver extends \JKingWeb\Arsse\Test\AbstractTest {
 
     public function testPartiallyRollbackChainedTransactions() {
         $select = "SELECT count(*) FROM arsse_test";
-        $insert = "INSERT INTO arsse_test default values";
         $this->drv->exec($this->create);
         $tr1 = $this->drv->begin();
-        $this->drv->query($insert);
+        $this->drv->query(static::$insertDefaultValues);
         $this->assertEquals(1, $this->drv->query($select)->getValue());
         $this->assertEquals(0, $this->query($select));
         $tr2 = $this->drv->begin();
-        $this->drv->query($insert);
+        $this->drv->query(static::$insertDefaultValues);
         $this->assertEquals(2, $this->drv->query($select)->getValue());
         $this->assertEquals(0, $this->query($select));
         $tr2->rollback();

tests/cases/Db/BaseResult.php

@@ -10,6 +10,7 @@ use JKingWeb\Arsse\Db\Result;
 use JKingWeb\Arsse\Test\DatabaseInformation;
 
 abstract class BaseResult extends \JKingWeb\Arsse\Test\AbstractTest {
+    protected static $insertDefault = "INSERT INTO arsse_test default values";
     protected static $dbInfo;
     protected static $interface;
     protected $resultClass;
@@ -57,17 +58,17 @@ abstract class BaseResult extends \JKingWeb\Arsse\Test\AbstractTest {
 
     public function testGetChangeCountAndLastInsertId() {
         $this->makeResult(static::$createMeta);
-        $r = new $this->resultClass(...$this->makeResult("INSERT INTO arsse_meta(key,value) values('test', 1)"));
+        $r = new $this->resultClass(...$this->makeResult("INSERT INTO arsse_meta(\"key\",value) values('test', 1)"));
         $this->assertSame(1, $r->changes());
         $this->assertSame(0, $r->lastId());
     }
 
     public function testGetChangeCountAndLastInsertIdBis() {
         $this->makeResult(static::$createTest);
-        $r = new $this->resultClass(...$this->makeResult("INSERT INTO arsse_test default values"));
+        $r = new $this->resultClass(...$this->makeResult(static::$insertDefault));
         $this->assertSame(1, $r->changes());
         $this->assertSame(1, $r->lastId());
-        $r = new $this->resultClass(...$this->makeResult("INSERT INTO arsse_test default values"));
+        $r = new $this->resultClass(...$this->makeResult(static::$insertDefault));
         $this->assertSame(1, $r->changes());
         $this->assertSame(2, $r->lastId());
     }

tests/cases/Db/BaseStatement.php

@@ -124,8 +124,8 @@ abstract class BaseStatement extends \JKingWeb\Arsse\Test\AbstractTest {
     }
 
     public function testViolateConstraint() {
-        (new $this->statementClass(...$this->makeStatement("CREATE TABLE if not exists arsse_meta(key varchar(255) primary key not null, value text)")))->run();
-        $s = new $this->statementClass(...$this->makeStatement("INSERT INTO arsse_meta(key) values(?)", ["str"]));
+        (new $this->statementClass(...$this->makeStatement("CREATE TABLE if not exists arsse_meta(\"key\" varchar(255) primary key not null, value text)")))->run();
+        $s = new $this->statementClass(...$this->makeStatement("INSERT INTO arsse_meta(\"key\") values(?)", ["str"]));
         $this->assertException("constraintViolation", "Db", "ExceptionInput");
         $s->runArray([null]);
     }

tests/cases/Db/BaseUpdate.php

@@ -81,7 +81,7 @@ class BaseUpdate extends \JKingWeb\Arsse\Test\AbstractTest {
     }
 
     public function testLoadIncompleteFile() {
-        file_put_contents($this->path."0.sql", "create table arsse_meta(key text primary key not null, value text);");
+        file_put_contents($this->path."0.sql", "create table arsse_meta(\"key\" varchar(255) primary key not null, value text);");
         $this->assertException("updateFileIncomplete", "Db");
         $this->drv->schemaUpdate(1, $this->base);
     }
@@ -100,7 +100,7 @@ class BaseUpdate extends \JKingWeb\Arsse\Test\AbstractTest {
 
     public function testPerformPartialUpdate() {
         file_put_contents($this->path."0.sql", static::$minimal1);
-        file_put_contents($this->path."1.sql", "UPDATE arsse_meta set value = '1' where key = 'schema_version'");
+        file_put_contents($this->path."1.sql", "UPDATE arsse_meta set value = '1' where \"key\" = 'schema_version'");
         $this->assertException("updateFileIncomplete", "Db");
         try {
             $this->drv->schemaUpdate(2, $this->base);

tests/cases/Db/MySQLPDO/TestDriver.php

@@ -0,0 +1,20 @@
+<?php
+/** @license MIT
+ * Copyright 2017 J. King, Dustin Wilson et al.
+ * See LICENSE and AUTHORS files for details */
+
+declare(strict_types=1);
+namespace JKingWeb\Arsse\TestCase\Db\MySQLPDO;
+
+/**
+ * @group slow
+ * @covers \JKingWeb\Arsse\Db\MySQL\PDODriver<extended>
+ * @covers \JKingWeb\Arsse\Db\PDODriver
+ * @covers \JKingWeb\Arsse\Db\PDOError */
+class TestDriver extends \JKingWeb\Arsse\TestCase\Db\BaseDriver {
+    protected static $implementation = "PDO MySQL";
+    protected $create = "CREATE TABLE arsse_test(id bigint auto_increment primary key)";
+    protected $lock = ["SET lock_wait_timeout = 1", "LOCK TABLES arsse_meta WRITE"];
+    protected $setVersion = "UPDATE arsse_meta set value = '#' where `key` = 'schema_version'";
+    protected static $insertDefaultValues = "INSERT INTO arsse_test(id) values(default)";
+}

tests/cases/Db/MySQLPDO/TestResult.php

@@ -0,0 +1,25 @@
+<?php
+/** @license MIT
+ * Copyright 2017 J. King, Dustin Wilson et al.
+ * See LICENSE and AUTHORS files for details */
+
+declare(strict_types=1);
+namespace JKingWeb\Arsse\TestCase\Db\MySQLPDO;
+
+use JKingWeb\Arsse\Test\DatabaseInformation;
+
+/**
+ * @group slow
+ * @covers \JKingWeb\Arsse\Db\PDOResult<extended>
+ */
+class TestResult extends \JKingWeb\Arsse\TestCase\Db\BaseResult {
+    protected static $implementation = "PDO MySQL";
+    protected static $createMeta = "CREATE TABLE arsse_meta(`key` varchar(255) primary key not null, value text)";
+    protected static $createTest = "CREATE TABLE arsse_test(id bigint auto_increment primary key)";
+    protected static $insertDefault = "INSERT INTO arsse_test(id) values(default)";
+
+    protected function makeResult(string $q): array {
+        $set = static::$interface->query($q);
+        return [static::$interface, $set];
+    }
+}

tests/cases/Db/MySQLPDO/TestStatement.php

@@ -0,0 +1,33 @@
+<?php
+/** @license MIT
+ * Copyright 2017 J. King, Dustin Wilson et al.
+ * See LICENSE and AUTHORS files for details */
+
+declare(strict_types=1);
+namespace JKingWeb\Arsse\TestCase\Db\MySQLPDO;
+
+/**
+ * @group slow
+ * @covers \JKingWeb\Arsse\Db\PDOStatement<extended>
+ * @covers \JKingWeb\Arsse\Db\PDOError */
+class TestStatement extends \JKingWeb\Arsse\TestCase\Db\BaseStatement {
+    protected static $implementation = "PDO MySQL";
+
+    protected function makeStatement(string $q, array $types = []): array {
+        return [static::$interface, static::$interface->prepare($q), $types];
+    }
+
+    protected function decorateTypeSyntax(string $value, string $type): string {
+        switch ($type) {
+            case "float":
+                return (substr($value, -2)==".0") ? "'".substr($value, 0, strlen($value) - 2)."'" : "'$value'";
+            case "string":
+                if (preg_match("<^char\((\d+)\)$>", $value, $match)) {
+                    return "'".\IntlChar::chr((int) $match[1])."'";
+                }
+                return $value;
+            default:
+                return $value;
+        }
+    }
+}

tests/cases/Db/MySQLPDO/TestUpdate.php

@@ -0,0 +1,17 @@
+<?php
+/** @license MIT
+ * Copyright 2017 J. King, Dustin Wilson et al.
+ * See LICENSE and AUTHORS files for details */
+
+declare(strict_types=1);
+namespace JKingWeb\Arsse\TestCase\Db\MySQLPDO;
+
+/**
+ * @group slow
+ * @covers \JKingWeb\Arsse\Db\MySQL\PDODriver<extended>
+ * @covers \JKingWeb\Arsse\Db\PDOError */
+class TestUpdate extends \JKingWeb\Arsse\TestCase\Db\BaseUpdate {
+    protected static $implementation = "PDO MySQL";
+    protected static $minimal1 = "CREATE TABLE arsse_meta(`key` varchar(255) primary key, value text); INSERT INTO arsse_meta(`key`,value) values('schema_version','1');";
+    protected static $minimal2 = "UPDATE arsse_meta set value = '2' where `key` = 'schema_version';";
+}

tests/lib/AbstractTest.php

@@ -48,6 +48,9 @@ abstract class AbstractTest extends \PHPUnit\Framework\TestCase {
             'dbPostgreSQLPass' => "arsse_test",
             'dbPostgreSQLDb' => "arsse_test",
             'dbPostgreSQLSchema' => "arsse_test",
+            'dbMySQLUser' => "arsse_test",
+            'dbMySQLPass' => "arsse_test",
+            'dbMySQLDb' => "arsse_test",
         ];
         Arsse::$conf = ($force ? null : Arsse::$conf) ?? (new Conf)->import($defaults)->import($conf);
     }

tests/lib/DatabaseInformation.php

@@ -27,7 +27,7 @@ class DatabaseInformation {
         if (!isset(self::$data)) {
             self::$data = self::getData();
         }
-        if (!isset(self::$data[$name])) {
+        if (!array_key_exists($name, self::$data)) {
             throw new \Exception("Invalid database driver name");
         }
         $this->name = $name;
@@ -162,6 +162,48 @@ class DatabaseInformation {
                 $pgExecFunction($db, $st);
             }
         };
+        $mysqlTableList = function($db): array {
+            $listTables = "SELECT table_name as name from information_schema.tables where table_schema = database() and table_name like 'arsse_%'";
+            if ($db instanceof Driver) {
+                $tables = $db->query($listTables)->getAll();
+            } elseif ($db instanceof \PDO) {
+                $tables = $db->query($listTables)->fetchAll(\PDO::FETCH_ASSOC);
+            } else {
+                $tables = $db->query($listTables)->fetch_all(\MYSQLI_ASSOC);
+            }
+            $tables = sizeof($tables) ? array_column($tables, "name") : [];
+            return $tables;
+        };
+        $mysqlTruncateFunction = function($db, array $afterStatements = []) use ($mysqlTableList) {
+            // rollback any pending transaction
+            try {
+                $db->query("UNLOCK TABLES; ROLLBACK");
+            } catch (\Throwable $e) {
+            }
+            foreach ($mysqlTableList($db) as $table) {
+                if ($table == "arsse_meta") {
+                    $db->query("DELETE FROM $table where `key` <> 'schema_version'");
+                } else {
+                    $db->query("DELETE FROM $table");
+                }
+            }
+            foreach ($afterStatements as $st) {
+                $db->query($st);
+            }
+        };
+        $mysqlRazeFunction = function($db, array $afterStatements = []) use ($mysqlTableList) {
+            // rollback any pending transaction
+            try {
+                $db->query("UNLOCK TABLES; ROLLBACK");
+            } catch (\Throwable $e) {
+            }
+            foreach ($mysqlTableList($db) as $table) {
+                $db->query("DROP TABLE IF EXISTS $table");
+            }
+            foreach ($afterStatements as $st) {
+                $db->query($st);
+            }
+        };
         return [
             'SQLite 3' => [
                 'pdo' => false,
@@ -244,6 +286,34 @@ class DatabaseInformation {
                 'truncateFunction' => $pgTruncateFunction,
                 'razeFunction' => $pgRazeFunction,
             ],
+            'PDO MySQL' => [
+                'pdo' => true,
+                'backend' => "MySQL",
+                'statementClass' => \JKingWeb\Arsse\Db\PDOStatement::class,
+                'resultClass' => \JKingWeb\Arsse\Db\PDOResult::class,
+                'driverClass' => \JKingWeb\Arsse\Db\MySQL\PDODriver::class,
+                'stringOutput' => true,
+                'interfaceConstructor' => function() {
+                    try {
+                        $dsn = [];
+                        $params = [
+                            'charset' => "utf8mb4",
+                            'host' => Arsse::$conf->dbMySQLHost,
+                            'port' => Arsse::$conf->dbMySQLPort,
+                            'dbname' => Arsse::$conf->dbMySQLDb,
+                        ];
+                        foreach ($params as $k => $v) {
+                            $dsn[] = "$k=$v";
+                        }
+                        $dsn = "mysql:".implode(";", $dsn);
+                        return new \PDO($dsn, Arsse::$conf->dbMySQLUser, Arsse::$conf->dbMySQLPass, [\PDO::ATTR_ERRMODE => \PDO::ERRMODE_EXCEPTION, \PDO::MYSQL_ATTR_MULTI_STATEMENTS => false, \PDO::MYSQL_ATTR_INIT_COMMAND => "SET sql_mode = '".\JKingWeb\Arsse\Db\MySQL\PDODriver::SQL_MODE."'",]);
+                    } catch (\Throwable $e) {
+                        return;
+                    }
+                },
+                'truncateFunction' => $mysqlTruncateFunction,
+                'razeFunction' => $mysqlRazeFunction,
+            ],
         ];
     }
 }

tests/phpunit.xml

@@ -68,6 +68,12 @@
         <file>cases/Db/PostgreSQLPDO/TestCreation.php</file>
         <file>cases/Db/PostgreSQLPDO/TestDriver.php</file>
         <file>cases/Db/PostgreSQLPDO/TestUpdate.php</file>
+
+        <file>cases/Db/MySQLPDO/TestResult.php</file>
+        <file>cases/Db/MySQLPDO/TestStatement.php</file>
+        <file>cases/Db/MySQLPDO/TestCreation.php</file>
+        <file>cases/Db/MySQLPDO/TestDriver.php</file>
+        <file>cases/Db/MySQLPDO/TestUpdate.php</file>
     </testsuite>
     <testsuite name="Database functions">
         <file>cases/Db/SQLite3/TestDatabase.php</file>