preload mysql driver(may fix issues in some cases)

src/main/java/com/mengcraft/simpleorm/EbeanHandler.java

@@ -206,7 +206,7 @@ DataSource newDataSource() {
         HikariDataSource source = new HikariDataSource();
         source.setPoolName(name);
         source.setConnectionTimeout(5_000);
-        source.setJdbcUrl(IDatabaseDriver.validAndLoad(url));
+        source.setJdbcUrl(IDatabaseDriver.filter(url));
         source.setUsername(user);
         source.setPassword(password);
         source.setAutoCommit(false);

src/main/java/com/mengcraft/simpleorm/driver/IDatabaseDriver.java

@@ -27,7 +27,7 @@ private void load() {
         }
     }
 
-    public static String validAndLoad(String jdbc) {
+    public static String filter(String jdbc) {
         URI uri = URI.create(jdbc);
         if (!Objects.equals(uri.getScheme(), "jdbc")) {
             throw new IllegalArgumentException(jdbc + " is not valid jdbc url");
@@ -48,6 +48,7 @@ public static class Registry {
         static {
             register(new H2Driver());
             register(new PostgreDriver());
+            register(new MySqlDriver());
         }
 
         private static void register(IDatabaseDriver driver) {

src/main/java/com/mengcraft/simpleorm/driver/MySqlDriver.java

@@ -0,0 +1,19 @@
+package com.mengcraft.simpleorm.driver;
+
+public class MySqlDriver extends IDatabaseDriver {
+
+    @Override
+    protected String clazz() {
+        return "com.mysql.jdbc.Driver";
+    }
+
+    @Override
+    protected String protocol() {
+        return "mysql";
+    }
+
+    @Override
+    protected String description() {
+        return "mysql:mysql-connector-java:jar:5.1.49";
+    }
+}