将结果集封装到List中

该博客讲述了如何在Java中使用ResultSet将SQL查询结果封装到ArrayList中。通过建立Statement,执行SQL查询,遍历ResultSet,将每条数据转化为Customer对象并添加到ArrayList中,实现了数据的转换与存储。

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import java.sql.Connection;   
import java.sql.ResultSet;   
import java.sql.SQLException;   
import java.sql.Statement;   
import java.util.ArrayList;   
import java.util.List;   

public class TestResultSet {   
        public static List query(){   
                Connection conn = new ConnectionUtil().openConnection();   
                try {   
                        Statement stmt = conn.createStatement();   
                        String sql = "select id,name,email from customertbl";   
                        ResultSet rs = stmt.executeQuery(sql);   
                        //将结果集封装到List中   
                        List list = new ArrayList();   
                        while(rs.next()){   
                                // 可以根据列名称也可以根据列索引   
                                int id = rs.getInt(1);   
                                String name = rs.getString("name");   
                                String email = rs.getString("email");   
                                System.out.println(id+":"+name+":"+email);   
                                Customer c = new Customer();   
                                c.setId(id);   
                                c.setName(name);   
                                c.setEmail(email);   
                                //将对象存放到list容器中   
                                list.add(c);   
                        }   
                        return list;   
                } catch (SQLException e) {   
                        // TODO Auto-generated catch block   
                        e.printStackTrace();   
                }finally{   
                        try {   
                                conn.close();   
                        } catch (SQLException e) {   
                                conn = null;   
                                e.printStackTrace();   
                        }   
                }   
                return null;   
        }   
}
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