refactor database schema upgrade to support skipping versions

lib/Data/Database.php

@@ -853,90 +853,87 @@ class Database extends AbstractData
     {
         $dataType       = $this->_getDataType();
         $attachmentType = $this->_getAttachmentType();
-        switch ($oldversion) {
-            case '0.21':
-                // create the meta column if necessary (pre 0.21 change)
-                try {
-                    $this->_db->exec(
-                        'SELECT "meta" FROM "' . $this->_sanitizeIdentifier('paste') . '" ' .
-                        ($this->_type === 'oci' ? 'FETCH NEXT 1 ROWS ONLY' : 'LIMIT 1')
-                    );
-                } catch (PDOException $e) {
-                    $this->_db->exec('ALTER TABLE "' . $this->_sanitizeIdentifier('paste') . '" ADD COLUMN "meta" TEXT');
-                }
-                // SQLite only allows one ALTER statement at a time...
+        if (version_compare($oldversion, '0.21', '<=')) {
+            // create the meta column if necessary (pre 0.21 change)
+            try {
+                $this->_db->exec(
+                    'SELECT "meta" FROM "' . $this->_sanitizeIdentifier('paste') . '" ' .
+                    ($this->_type === 'oci' ? 'FETCH NEXT 1 ROWS ONLY' : 'LIMIT 1')
+                );
+            } catch (PDOException $e) {
+                $this->_db->exec('ALTER TABLE "' . $this->_sanitizeIdentifier('paste') . '" ADD COLUMN "meta" TEXT');
+            }
+            // SQLite only allows one ALTER statement at a time...
+            $this->_db->exec(
+                'ALTER TABLE "' . $this->_sanitizeIdentifier('paste') .
+                "\" ADD COLUMN \"attachment\" $attachmentType"
+            );
+            $this->_db->exec(
+                'ALTER TABLE "' . $this->_sanitizeIdentifier('paste') . "\" ADD COLUMN \"attachmentname\" $dataType"
+            );
+            // SQLite doesn't support MODIFY, but it allows TEXT of similar
+            // size as BLOB, so there is no need to change it there
+            if ($this->_type !== 'sqlite') {
                 $this->_db->exec(
                     'ALTER TABLE "' . $this->_sanitizeIdentifier('paste') .
-                    "\" ADD COLUMN \"attachment\" $attachmentType"
+                    "\" ADD PRIMARY KEY (\"dataid\"), MODIFY COLUMN \"data\" $dataType"
                 );
                 $this->_db->exec(
-                    'ALTER TABLE "' . $this->_sanitizeIdentifier('paste') . "\" ADD COLUMN \"attachmentname\" $dataType"
+                    'ALTER TABLE "' . $this->_sanitizeIdentifier('comment') .
+                    "\" ADD PRIMARY KEY (\"dataid\"), MODIFY COLUMN \"data\" $dataType, " .
+                    "MODIFY COLUMN \"nickname\" $dataType, MODIFY COLUMN \"vizhash\" $dataType"
                 );
-                // SQLite doesn't support MODIFY, but it allows TEXT of similar
-                // size as BLOB, so there is no need to change it there
-                if ($this->_type !== 'sqlite') {
-                    $this->_db->exec(
-                        'ALTER TABLE "' . $this->_sanitizeIdentifier('paste') .
-                        "\" ADD PRIMARY KEY (\"dataid\"), MODIFY COLUMN \"data\" $dataType"
-                    );
-                    $this->_db->exec(
-                        'ALTER TABLE "' . $this->_sanitizeIdentifier('comment') .
-                        "\" ADD PRIMARY KEY (\"dataid\"), MODIFY COLUMN \"data\" $dataType, " .
-                        "MODIFY COLUMN \"nickname\" $dataType, MODIFY COLUMN \"vizhash\" $dataType"
-                    );
-                } else {
-                    $this->_db->exec(
-                        'CREATE UNIQUE INDEX IF NOT EXISTS "' .
-                        $this->_sanitizeIdentifier('paste_dataid') . '" ON "' .
-                        $this->_sanitizeIdentifier('paste') . '" ("dataid")'
-                    );
-                    $this->_db->exec(
-                        'CREATE UNIQUE INDEX IF NOT EXISTS "' .
-                        $this->_sanitizeIdentifier('comment_dataid') . '" ON "' .
-                        $this->_sanitizeIdentifier('comment') . '" ("dataid")'
-                    );
-                }
-                // CREATE INDEX IF NOT EXISTS not supported as of Oracle MySQL <= 8.0
+            } else {
                 $this->_db->exec(
-                    'CREATE INDEX "' .
-                    $this->_sanitizeIdentifier('comment_parent') . '" ON "' .
-                    $this->_sanitizeIdentifier('comment') . '" ("pasteid")'
+                    'CREATE UNIQUE INDEX IF NOT EXISTS "' .
+                    $this->_sanitizeIdentifier('paste_dataid') . '" ON "' .
+                    $this->_sanitizeIdentifier('paste') . '" ("dataid")'
                 );
-                // no break, continue with updates for 0.22 and later
-            case '1.3':
-                // SQLite doesn't support MODIFY, but it allows TEXT of similar
-                // size as BLOB and PostgreSQL uses TEXT, so there is no need
-                // to change it there
-                if ($this->_type !== 'sqlite' && $this->_type !== 'pgsql') {
-                    $this->_db->exec(
-                        'ALTER TABLE "' . $this->_sanitizeIdentifier('paste') .
-                        "\" MODIFY COLUMN \"data\" $attachmentType"
-                    );
-                }
-                // no break, continue with updates for all newer versions
-            case '1.7.2':
-                $supportsDropColumn = true;
-                if ($this->_type === 'sqlite') {
-                    try {
-                        $row                = $this->_select('SELECT sqlite_version() AS "v"', array(), true);
-                        $supportsDropColumn = version_compare($row['v'], '3.35.0', '>=');
-                    } catch (PDOException $e) {
-                        $supportsDropColumn = false;
-                    }
-                }
-                if ($supportsDropColumn) {
-                    $this->_db->exec(
-                        'ALTER TABLE "' . $this->_sanitizeIdentifier('paste') .
-                        '" DROP COLUMN "postdate"'
-                    );
+                $this->_db->exec(
+                    'CREATE UNIQUE INDEX IF NOT EXISTS "' .
+                    $this->_sanitizeIdentifier('comment_dataid') . '" ON "' .
+                    $this->_sanitizeIdentifier('comment') . '" ("dataid")'
+                );
+            }
+            // CREATE INDEX IF NOT EXISTS not supported as of Oracle MySQL <= 8.0
+            $this->_db->exec(
+                'CREATE INDEX "' .
+                $this->_sanitizeIdentifier('comment_parent') . '" ON "' .
+                $this->_sanitizeIdentifier('comment') . '" ("pasteid")'
+            );
+        }
+        if (version_compare($oldversion, '1.3', '<=')) {
+            // SQLite doesn't support MODIFY, but it allows TEXT of similar
+            // size as BLOB and PostgreSQL uses TEXT, so there is no need
+            // to change it there
+            if ($this->_type !== 'sqlite' && $this->_type !== 'pgsql') {
+                $this->_db->exec(
+                    'ALTER TABLE "' . $this->_sanitizeIdentifier('paste') .
+                    "\" MODIFY COLUMN \"data\" $attachmentType"
+                );
+            }
+        }
+        if (version_compare($oldversion, '1.7.1', '<=')) {
+            $supportsDropColumn = true;
+            if ($this->_type === 'sqlite') {
+                try {
+                    $row                = $this->_select('SELECT sqlite_version() AS "v"', array(), true);
+                    $supportsDropColumn = version_compare($row['v'], '3.35.0', '>=');
+                } catch (PDOException $e) {
+                    $supportsDropColumn = false;
                 }
-                // no break, continue with updates for all newer versions
-            default:
-                $this->_exec(
-                    'UPDATE "' . $this->_sanitizeIdentifier('config') .
-                    '" SET "value" = ? WHERE "id" = ?',
-                    array(Controller::VERSION, 'VERSION')
+            }
+            if ($supportsDropColumn) {
+                $this->_db->exec(
+                    'ALTER TABLE "' . $this->_sanitizeIdentifier('paste') .
+                    '" DROP COLUMN "postdate"'
                 );
+            }
         }
+        $this->_exec(
+            'UPDATE "' . $this->_sanitizeIdentifier('config') .
+            '" SET "value" = ? WHERE "id" = ?',
+            array(Controller::VERSION, 'VERSION')
+        );
     }
 }