解决mysql-connector-java为8.0.16时MyBatis Generator无法生成XXXByPrimaryKey相关方法 (#418)

Co-authored-by: laiyingzeng <laiyingzeng@gmail.com>

litemall-db/mybatis-generator/generatorConfig.xml

@@ -43,7 +43,7 @@
 
         <!--数据库连接信息-->
         <jdbcConnection driverClass="com.mysql.cj.jdbc.Driver"
-                        connectionURL="jdbc:mysql://127.0.0.1:3306/litemall?useUnicode=true&amp;characterEncoding=UTF-8&amp;serverTimezone=UTC&amp;verifyServerCertificate=false&amp;useSSL=false"
+                        connectionURL="jdbc:mysql://127.0.0.1:3306/litemall?useUnicode=true&amp;characterEncoding=UTF-8&amp;serverTimezone=UTC&amp;verifyServerCertificate=false&amp;useSSL=false&amp;nullCatalogMeansCurrent=true"
                         userId="litemall"
                         password="litemall123456"/>