DEP Remove support for MySQL 5

_register_database.php

@@ -9,7 +9,7 @@ DatabaseAdapterRegistry::register(
     [
         'class' => 'MySQLDatabase',
         'module' => 'framework',
-        'title' => 'MySQL 5.0+ (using MySQLi)',
+        'title' => 'MySQL 8.0+ (using MySQLi)',
         'helperPath' => __DIR__ . '/src/Dev/Install/MySQLDatabaseConfigurationHelper.php',
         'helperClass' => MySQLDatabaseConfigurationHelper::class,
         'supported' => class_exists('MySQLi'),

src/Dev/Install/MySQLDatabaseConfigurationHelper.php

@@ -135,7 +135,7 @@ class MySQLDatabaseConfigurationHelper implements DatabaseConfigurationHelper
         if ($version) {
             $success = version_compare($version ?? '', '5.0', '>=');
             if (!$success) {
-                $error = "Your MySQL server version is $version. It's recommended you use at least MySQL 5.0.";
+                $error = "Your MySQL server version is $version. It's recommended you use at least MySQL 8.0.";
             }
         } else {
             $error = "Could not determine your MySQL version.";
@@ -178,7 +178,7 @@ class MySQLDatabaseConfigurationHelper implements DatabaseConfigurationHelper
         }
 
         // Restricted to characters in the ASCII and Extended ASCII range
-        // @see http://dev.mysql.com/doc/refman/5.0/en/identifiers.html
+        // @see https://dev.mysql.com/doc/refman/8.4/en/identifiers.html
         return preg_match('/^[\x{0001}-\x{FFFF}]+$/u', $database ?? '');
     }
 
@@ -199,7 +199,7 @@ class MySQLDatabaseConfigurationHelper implements DatabaseConfigurationHelper
         }
 
         // Escape all valid database patterns (permission must exist on all tables)
-        $sqlDatabase = addcslashes($database ?? '', '_%'); // See http://dev.mysql.com/doc/refman/5.7/en/string-literals.html
+        $sqlDatabase = addcslashes($database ?? '', '_%'); // https://dev.mysql.com/doc/refman/8.4/en/string-literals.html
         $dbPattern = sprintf(
             '((%s)|(%s)|(%s)|(%s))',
             preg_quote("\"$sqlDatabase\".*"), // Regexp escape sql-escaped db identifier

src/ORM/Connect/DBSchemaManager.php

@@ -601,7 +601,7 @@ abstract class DBSchemaManager
      * Some indexes may be arrays, such as fulltext and unique indexes, and this allows database-specific
      * arrays to be created. See {@link requireTable()} for details on the index format.
      *
-     * @see http://dev.mysql.com/doc/refman/5.0/en/create-index.html
+     * @see https://dev.mysql.com/doc/refman/8.4/en/create-index.html
      * @see parseIndexSpec() for approximate inverse
      *
      * @param string|array $indexSpec
@@ -679,8 +679,6 @@ abstract class DBSchemaManager
             $spec = $this->{$spec['type']}($spec['parts'], true);
         }
 
-        // Collations didn't come in until MySQL 4.1.  Anything earlier will throw a syntax error if you try and use
-        // collations.
         if (!$this->database->supportsCollations()) {
             $spec = preg_replace('/ *character set [^ ]+( collate [^ ]+)?( |$)/', '\\2', $spec ?? '');
         }

src/ORM/Connect/MySQLDatabase.php

@@ -529,9 +529,8 @@ class MySQLDatabase extends Database implements TransactionManager
     {
         $id = $this->getLockIdentifier($name);
 
-        // MySQL 5.7.4 and below auto-releases existing locks on subsequent GET_LOCK() calls.
+        // MySQL 8.0.0 and newer allow multiple locks per sessions even with the same name.
-        // MySQL 5.7.5 and newer allow multiple locks per sessions even with the same name.
+        // https://dev.mysql.com/doc/refman/8.4/en/locking-functions.html#function_get-lock
-        // https://dev.mysql.com/doc/refman/5.7/en/miscellaneous-functions.html#function_get-lock
         return (bool) $this->query(sprintf("SELECT GET_LOCK('%s', %d)", $id, $timeout))->value();
     }
 

src/ORM/FieldType/DBField.php

@@ -31,7 +31,7 @@ use SilverStripe\View\ViewableData;
  * <b>Subclass Example</b>
  *
  * The class is easy to overload with custom types, e.g. the MySQL "BLOB" type
- * (http://dev.mysql.com/doc/refman/5.0/en/blob.html).
+ * (https://dev.mysql.com/doc/refman/8.4/en/blob.html).
  *
  * <code>
  * class Blob extends DBField {

src/ORM/Queries/SQLDelete.php

@@ -15,7 +15,7 @@ class SQLDelete extends SQLConditionalExpression
      * List of tables to limit the delete to, if multiple tables
      * are specified in the condition clause
      *
-     * @see http://dev.mysql.com/doc/refman/5.0/en/delete.html
+     * @see https://dev.mysql.com/doc/refman/8.4/en/delete.html
      *
      * @var array
      */

tests/php/ORM/SQLSelectTest.php

@@ -957,7 +957,7 @@ class SQLSelectTest extends SapphireTest
     public function provideWith()
     {
         // Each of these examples shows it working with aliased implicit columns, and with explicit CTE columns.
-        // Most of these examples are derived from https://dev.mysql.com/doc/refman/8.0/en/with.html
+        // Most of these examples are derived from https://dev.mysql.com/doc/refman/8.4/en/with.html
         return [
             // Just a CTE, no union
             'basic CTE with aliased columns' => [