day05-19-jdbc-DAO

TbUser

package day05.jdbc;

import jdk.nashorn.internal.objects.annotations.Constructor;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

@Data
@NoArgsConstructor
@AllArgsConstructor
public class TbUser {
    private long id;
    private String name;
}

Demo06

使用对象接受数据

package day05.jdbc;
/*
crud 增删改查

 */

import com.google.common.collect.Lists;
import com.sun.tools.internal.xjc.reader.xmlschema.bindinfo.BIConversion;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.util.ArrayList;
import java.util.List;

public class Demo06 {
    public static void main(String[] args) throws Exception {
        List<TbUser> list = queryAll();
        System.out.println(list);

    }
    /*
    使用对象接受(经常）

     */


    public static List<TbUser> queryAll() throws Exception {
        Connection conn = MysqlUtil.getConn();
        String sql = "select * from auth_permission";
        PreparedStatement ps = conn.prepareStatement(sql);
        ResultSet resultSet = ps.executeQuery();
        List<TbUser> list = new ArrayList<>();
        while (resultSet.next()) {
            long id = resultSet.getLong(1);
            String name = resultSet.getString(2);
            TbUser tbUser= new TbUser(id,name);
            list.add(tbUser);
        }
        MysqlUtil.close(conn);
        return list;

    }
}