src/com/service/ClassesService.java

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package com.service;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import java.util.List;
import java.util.Date;
import java.util.Objects;
import com.dao.ClassesDao;
import com.entity.Classes;

@Service
public class   ClassesService {
 	@Autowired
	private ClassesDao classesMapper;

 	public boolean add(Classes classes) 
 	{
		return classesMapper.insert(classes) > 0;
	}
	public List<Classes> getList(int page, int size) 
	{
		return classesMapper.getList(size*(page-1), size);
	}
	public boolean delete(int id) 
	{
		return classesMapper.deleteByPrimaryKey(id) > 0;
	}
	public int getTotal()
	{
 		return classesMapper.getTotal();
	}
	public Classes selectByclasses(Classes classes) 
 	{
		Classes teacher1=classesMapper.selectByclasses(classes);
		return teacher1;
	}
	public boolean update(Classes classes) 
 	{
		return classesMapper.updateByPrimaryKeySelective(classes) > 0;
	}
}