001.java将MySQL的ResultSet结果集遍历到List中

 

 

public List<T> findAll(String tableName) throws SQLException {
        String sb = "select * from " + tableName; //查询语句
        Connection conn = mysqlConectComponent.getConnection();//JDBC连接方法，可以自己定义
        PreparedStatement state = conn.prepareStatement(sb);//通过PreparedStatement执行查询语句
        ResultSet rs = state.executeQuery();//将数据写入到ResultSet中
        ResultSetMetaData md = rs.getMetaData();//获取键名
        int columnCount = md.getColumnCount();//获取行的数量
        List list = new ArrayList<T>();// 定义一个list，用来存放数据
        while (rs.next()) {
            Map rowData = new HashMap();//声明Map
            for (int i = 1; i <= columnCount; i++) {
                rowData.put(md.getColumnName(i), rs.getObject(i));//获取键名及值
            }
            list.add(rowData);//将数据添加到list中
        }
        rs.close();
        close(conn, state);
        return list;
    }