java.sql.SQLException：列索引超出范围，0< 1 [英] java.sql.SQLException: Column Index out of range, 0 < 1

问题描述

我想显示数据库中的所有图像。我编写了代码但是显示错误java.sql.SQLException：列索引超出范围，0< 1.下面是我的数据库表

I want to display all the images from database. I have written code but that is displaying error java.sql.SQLException: Column Index out of range, 0 < 1. below is the my database table

| application_name | varchar(45)  | 
| application_id   | varchar(10)  | 
| application_path | varchar(500) | 
| application_icon | blob         | 

我想只显示images.below是我的servlet代码

I want to display only images.below is my servlet code

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
            // TODO Auto-generated method stub
            response.setContentType("image/jpeg");
            PrintWriter out=response.getWriter();
            try {
                Connection connection= DBUtil.getConnection();
                PreparedStatement preparedStatement=connection.prepareStatement("select application_icon  from application_master");
                ResultSet resultSet=preparedStatement.executeQuery();
                System.out.println("resultSet"+resultSet);
                out.print("<h1>photo</h1>");
                while (resultSet.next()) {
                    out.print("<img width='200' height='200' src="+resultSet.getBlob(0)+ ">  </img>" );
}
        } catch (ClassNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

    }

推荐答案

列索引应从1开始而不是0

Column Index should start from 1 and not 0

http://docs.oracle.com/javase/7/docs/api/java/sql/ResultSet.html#getBlob（INT）

参数：columnIndex - 第一列是1，第二列是2，...

Parameters: columnIndex - the first column is 1, the second is 2, ...

应该是

resultSet.getBlob(1) //first column

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