2020.05.17 模糊查询下的分页查询

Posted 2021-02-19 aojie

package cn.itcast.travel.dao.impl;

import cn.itcast.travel.dao.RouteDao;
import cn.itcast.travel.domain.Route;
import cn.itcast.travel.util.JDBCUtils;
import org.springframework.jdbc.core.BeanPropertyRowMapper;
import org.springframework.jdbc.core.JdbcTemplate;

import java.util.ArrayList;
import java.util.List;

/**
 * @author aojie
 * @fuction
 * @create 2020-05-15 22:15
 */
public class RouteDaoImpl implements RouteDao {
    private JdbcTemplate jdbcTemplate=new JdbcTemplate(JDBCUtils.getDataSource());
    @Override
    public int findTotalCount(int cid, String rname) {
//        String sql="select count(*) from tab_route where cid=?";
        String sql="select count(*) from tab_route where 1=1 ";
        StringBuilder builder=new StringBuilder(sql);
        //用来判断参数是否有值
        List params=new ArrayList();
        if (cid!=0){
            builder.append(" and cid=? ");
            //添加?对应的值
            params.add(cid);
        }
        if (rname.equals("")){
            builder.append(" and rname like ?");
            params.add("%"+rname+"%");
        }
        sql=builder.toString();
        return jdbcTemplate.queryForObject(sql,Integer.class,params.toArray());

    }

    @Override
    public List<Route> findByPage(int cid, int start, int pageSize, String rname) {
//        String sql="select * from tab_route where cid=? limit ? , ? ";
        String sql="select * from tab_route where 1=1 ";
        StringBuilder builder=new StringBuilder(sql);
        List params=new ArrayList();
        if (cid!=0){
            builder.append(" and cid=? ");
            //添加?对应的值
            params.add(cid);
        }
        if (rname.equals("")){
            builder.append(" and rname like ?");
            params.add("%"+rname+"%");
        }
        builder.append(" limit ? , ?");
        sql=builder.toString();
        params.add(start);
        params.add(pageSize);
        return jdbcTemplate.query(sql,new BeanPropertyRowMapper<Route>(Route.class),params.toArray());
    }

    @Override
    public Route findOne(int rid) {
        String sql="select * from tab_route where rid=?";
        return jdbcTemplate.queryForObject(sql,new BeanPropertyRowMapper<Route>(Route.class),rid);
    }
}