JAVA版SqlHelper

//JAVA版SqlHelper

package com.test.Dao;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.sql.Statement;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import javax.servlet.jsp.jstl.sql.Result;
import javax.servlet.jsp.jstl.sql.ResultSupport;
public class SqlHelper {

    public  String query(String sql)
    {
        String result="";
        try{
              Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");
            Connection conn= DriverManager.getConnection("jdbc:sqlserver://116.255.154.99;DatabaseName=test;user=sa;password=Tcqbb1989");
            String sql1 = "select * from article";
            Statement stmt=conn.createStatement();
            ResultSet rs = stmt.executeQuery(sql1);
            while(rs.next()){
                result+=rs.getString(1)+"===="+rs.getString(2)+"</br>";
            }

        }catch(Exception e){

            result+=e.getMessage();
           }

        return result;

    }

    public  List   query2(String sql)
    {

        ResultSet result = null;
        try{
              Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");
            Connection conn= DriverManager.getConnection("jdbc:sqlserver://116.255.154.99;DatabaseName=test;user=sa;password=Tcqbb1989");
            String sql1 = "select * from article";
            Statement stmt=conn.createStatement();
            ResultSet rs = stmt.executeQuery(sql1);

            return resultSetToList(rs);

        }catch(Exception e){

           }

        return null;

    }

    public  int excute(String sql)
    {
        String result="";
        int rows1 =0;
        try{
              Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");
            Connection conn= DriverManager.getConnection("jdbc:sqlserver://116.255.154.99;DatabaseName=test;user=sa;password=Tcqbb1989");

            Statement stmt=conn.createStatement();
             rows1 = stmt.executeUpdate(sql);

        }catch(Exception e){

            result+=e.getMessage();
           }

        return rows1;

    }

    public  List resultSetToList(ResultSet rs) throws java.sql.SQLException {
        if (rs == null)
            return Collections.EMPTY_LIST;
        ResultSet md = (ResultSet) rs.getMetaData(); //得到结果集(rs)的结构信息，比如字段数、字段名等
        int columnCount = ((ResultSetMetaData) md).getColumnCount(); //返回此 ResultSet 对象中的列数
        List list = new ArrayList();
        Map rowData = new HashMap();
        while (rs.next()) {
         rowData = new HashMap(columnCount);
         for (int i = 1; i <= columnCount; i++) {
                 rowData.put(((ResultSetMetaData) md).getColumnName(i), rs.getObject(i));
         }
         list.add(rowData);
         System.out.println("list:" + list.toString());
        }
        return list;
}  

}