Skeleton code for database

src/main/java/org/leolo/nrdatad/db/DatabaseManager.java

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+package org.leolo.nrdatad.db;
+
+public interface DatabaseManager {
+}

src/main/java/org/leolo/nrdatad/db/mariadb/DatabaseManager.java

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+package org.leolo.nrdatad.db.mariadb;
+
+public class DatabaseManager implements org.leolo.nrdatad.db.DatabaseManager{
+
+}

src/test/java/org/leolo/nrdatad/db/test/DatabaseManager.java

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+package org.leolo.nrdatad.db.test;
+
+public class DatabaseManager implements org.leolo.nrdatad.db.DatabaseManager {
+}