Mybatis的dao层,service层的封装
配置:
分别创建四个包
使用插件自动生成对应的类和bean对象
创建BaseMapper
package com.shsxt.base;
import org.springframework.dao.DataAccessException;
import java.util.List;
import java.util.Map;
public interface BaseMapper {
/**
* 添加记录不返回主键
* @param entity
* @return
* @throws DataAccessException
*/
public int insert(T entity) throws DataAccessException;
/**
*
* @param entities
* @return
* @throws DataAccessException
*/
public int insertBatch(List entities) throws DataAccessException;
/**
* 查询总记录数
* @param map
* @return
*/
@SuppressWarnings("rawtypes")
public int queryCountByParams(Map map) throws DataAccessException;
/**
* 查询记录 通过id
* @param id
* @return
*/
public T queryById(Integer id) throws DataAccessException;
/**
* 分页查询记录
* @param baseQuery
* @return
*/
public List queryForPage(BaseQuery baseQuery) throws DataAccessException;
/**
* 查询记录不带分页情况
* @param map
* @return
*/
@SuppressWarnings("rawtypes")
public List queryByParams(Map map) throws DataAccessException;
/**
* 更新记录
* @param entity
* @return
*/
public int update(T entity) throws DataAccessException;
/**
* 批量更新
* @param map
* @return
* @throws DataAccessException
*/
public int updateBatch(Map map) throws DataAccessException;
/**
* 删除记录
* @param id
* @return
*/
public int delete(Integer id) throws DataAccessException;
/**
* 批量删除
* @param ids
* @return
*/
public int deleteBatch(int[] ids) throws DataAccessException;
}
创建BaseService
package com.shsxt.base;
import com.github.pagehelper.PageHelper;
import com.github.pagehelper.PageInfo;
import org.springframework.beans.factory.annotation.Autowired;
import java.util.List;
import java.util.Map;
public abstract class BaseService {
@Autowired
public BaseMapper baseMapper;
/**
* 添加记录
* @param entity
* @return
* @throws Exception
*/
public int insert(T entity) throws Exception{
int result= baseMapper.insert(entity);
return result;
}
/**
* 批量添加记录
* @param entities
* @return
* @throws Exception
*/
public int insertBatch(List entities) throws Exception{
return baseMapper.insertBatch(entities);
}
/**
* 根据参数统计记录数
* @param map
* @return
* @throws Exception
*/
@SuppressWarnings("rawtypes")
public int queryCountByParams(Map map)throws Exception{
return baseMapper.queryCountByParams(map);
}
/**
* 查询记录通过id
* @param id
* @return
* @throws Exception
*/
public T queryById(Integer id)throws Exception{
AssertUtil.isNull(id, "记录id非空!");
return baseMapper.queryById(id);
}
/**
* 分页查询
* @param baseQuery
* @return
* @throws Exception
*/
public PageInfo queryForPage(BaseQuery baseQuery)throws Exception{
PageHelper.startPage(baseQuery.getPageNum(),baseQuery.getPageSize());
List list= baseMapper.queryForPage(baseQuery);
PageInfo pageInfo=new PageInfo(list);
return pageInfo;
}
/**
*
* @param map
* @return
* @throws Exception
*/
@SuppressWarnings("rawtypes")
public List queryByParams(Map map)throws Exception{
return baseMapper.queryByParams(map);
}
/**
* 查询记录
* @param entity
* @return
* @throws Exception
*/
public int update(T entity)throws Exception{
return baseMapper.update(entity);
}
/**
* 批量更新
* @param map
* @return
* @throws Exception
*/
@SuppressWarnings("rawtypes")
public int updateBatch(Map map) throws Exception{
return baseMapper.updateBatch(map);
}
/**
* 删除记录
* @param id
* @return
* @throws Exception
*/
public int delete(Integer id) throws Exception{
// 判断 空
AssertUtil.isNull(id, "记录id非空！");
AssertUtil.isNull(queryById(id), "待删除的记录不存在!");
return baseMapper.delete(id);
}
/**
* 批量删除
* @param ids
* @return
*/
public int deleteBatch(int[] ids) throws Exception{
AssertUtil.isNull(ids.length==0,"请至少选择一项记录!");
return baseMapper.deleteBatch(ids);
}
}
基本的分页查询
package com.shsxt.base;
public class BaseQuery {
/**
* 分页页码
*/
private int pageNum=1;
/**
* 每页记录数
*/
private int pageSize=10;
public int getPageNum() {
return pageNum;
}
public void setPageNum(int pageNum) {
this.pageNum = pageNum;
}
public int getPageSize() {
return pageSize;
}
public void setPageSize(int pageSize) {
this.pageSize = pageSize;
}
}
断言类
package com.shsxt.base;
public class AssertUtil {
/**
* 表达式结果真时判断
* @param msg
*/
public static void isTrue(Boolean expression,String msg){
if(expression){
throw new ParamException(msg);
}
}
public static void isTure(Boolean expression){
if(expression){
throw new ParamException("参数异常");
}
}
/**
* 参数为空时
* @param object
* @param msg
*/
public static void isNull(Object object,String msg){
if(object==null){
throw new ParamException(msg);
}
}
/**
* 参数不空时
* @param object
* @param msg
*/
public static void notNull(Object object,String msg){
if(object!=null){
throw new ParamException(msg);
}
}
}
参数异常类
package com.shsxt.base;
/**
* 参数异常类
* @author Administrator
*
*/
public class ParamException extends RuntimeException{
/**
*
*/
private static final long serialVersionUID = -5962296753554846774L;
/**
* 错误状态码
*/
private int errorCode;
public ParamException() {
}
/**
* 错误消息
* @param msg
*/
public ParamException(String msg) {
super(msg);
}
public ParamException(int errorCode,String msg){
super(msg);
this.errorCode=errorCode;
}
public int getErrorCode() {
return errorCode;
}
public void setErrorCode(int errorCode) {
this.errorCode = errorCode;
}
}
写接口时,只需要继承即可
package com.shsxt.dao;
import com.shsxt.base.BaseMapper;
import com.shsxt.po.Account;
import org.springframework.stereotype.Repository;
@Repository
public interface AccountMapper extends BaseMapper{
}
写service层时,也只需要继承即可
package com.shsxt.service;
import com.shsxt.base.BaseService;
import com.shsxt.dao.AccountMapper;
import com.shsxt.po.Account;
import org.springframework.stereotype.Service;
import javax.annotation.Resource;
@Service
public class AccountService extends BaseService{
@Resource
private AccountMapper accountMapper;
}
写实现类
package com.shsxt.service;
import com.shsxt.po.Account;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
import javax.annotation.Resource;
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(locations = {"classpath:spring.xml"} )
public class AccountServiceTest {
@Resource
private AccountService accountService;
@Test
public void test1() throws Exception {
Account account =accountService.queryById(8);
System.out.println(account);
}
}