Merge pull request #123 from cherrylzhao/dev

import java.util.List;

public interface CommonRepository<T> {

public interface CommonRepository<T, P> {

    /**

     * Create table if not exist.

     */

    void createTableIfNotExists();

    /**

     * Drop table.

     */

    void dropTable();

    /**

     * Truncate table.

     */

    void truncateTable();

    Long insert(T entity);

    /**

     * insert one entity.

     * @param entity entity

     * @return primary key

     */

    P insert(T entity);

    void delete(Long id);

    /**

     * Do delete.

     * @param key key

     */

    void delete(P key);

    /**

     * select all.

     * @return list of entity

     */

    List<T> selectAll();

}

import org.apache.shardingsphere.example.common.entity.OrderItem;

public interface OrderItemRepository extends CommonRepository<OrderItem> {

public interface OrderItemRepository extends CommonRepository<OrderItem, Long> {

}

import org.apache.shardingsphere.example.common.entity.Order;

public interface OrderRepository extends CommonRepository<Order> {

public interface OrderRepository extends CommonRepository<Order, Long> {

}

import org.apache.shardingsphere.example.common.entity.User;

public interface UserRepository extends CommonRepository<User> {

public interface UserRepository extends CommonRepository<User, Long> {

}