springboot整合tk.mybatis入门2 通用service

曾经终败给现在 2022-05-15 15:00 243阅读 0赞

## 之前讲的就不说了 现在直接到通用service ##

## 1.首先创建service通用类 ##

/**
     * 
     * @author 	cyf
     * @date	2018/10/30 上午10:36:34
     * @param <T>
     */
    public interface commonService<T> {
    
        T selectByKey(Object key);
        
        T selectOne(T entity);
    
        int save(T entity);
    
        int delete(Object key);
    
        int updateAll(T entity);
    
        int updateNotNull(T entity);
    
        List<T> selectPage(int pageNum, int pageSize);
    
        List<T> selectPage(int pageNum, int pageSize, T entity);
        
    }

## 2.现写一下通用service的实现 ##

package com.orhonit.common.service.impl;
    
    
    import java.util.List;
    
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.stereotype.Service;
    
    import com.github.pagehelper.PageHelper;
    import com.orhonit.common.service.CommonService;
    
    import tk.mybatis.mapper.common.Mapper;
    
    /**
     * 
     * @author 	cyf
     * @date	2018/10/30 上午10:39:36
     * @param <T>
     */
    @Service
    public abstract class CommonServiceImpl<T> implements CommonService<T> {
    
        @Autowired
        protected Mapper<T> mapper;
    
        @Override
        public T selectByKey(Object key) {
            return mapper.selectByPrimaryKey(key);
        }
        
        @Override
        public T selectOne(T entity){
        	return mapper.selectOne(entity);
        }
    
        @Override
        public int save(T entity) {
            return mapper.insert(entity);
        }
    
        @Override
        public int delete(Object key) {
            return mapper.deleteByPrimaryKey(key);
        }
    
        @Override
        public int updateAll(T entity) {
            return mapper.updateByPrimaryKey(entity);
        }
    
        @Override
        public int updateNotNull(T entity) {
            return mapper.updateByPrimaryKeySelective(entity);
        }
    
        @Override
        public List<T> selectPage(int pageNum,int pageSize) {
            PageHelper.startPage(pageNum,pageSize);
            return mapper.selectAll();
        }
    
        @Override
        public List<T> selectPage(int pageNum, int pageSize, T entity) {
            PageHelper.startPage(pageNum,pageSize);
            return mapper.select(entity);
        }
    
    }

注意:这里我将通用service做成抽象接口,也就意味着抽象方法可以让其子类实现(通用)

## 3.到目前为止tk.mybaits的通用mapper和service就讲解完毕了 ##

直接在service层用就可以了  
例如:

public interface UserService extends CommonService<SysUser> {
    }
    	
    
    @Service
    public class UserServiceImpl extends CommonServiceImpl<SysUser>  implements UserService {
    }