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Thread: How to Run PostgreSQL Query in JSP?!

  1. #1
    Junior Member
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    Default How to Run PostgreSQL Query in JSP?!

    Hi every body
    I search in google for JSP file to run PostgreSQL query , I find below code :
    <%@ page contentType="text/html; charset=iso-8859-1" language="java" import="java.sql.* " %>
    <%@ page import="java.io.*" %>
    <%
    try {
    String driver = "org.postgresql.Driver";
    String url = "jdbc:postgresql://192.168.1.2:4444/dbname";
    String username = "admin";
    String password = "123456";
    String myDataField = null;
    String myQuery = "SELECT datname FROM pg_database";
    Connection myConnection = null;
    PreparedStatement myPreparedStatement = null;
    ResultSet myResultSet = null;
    Class.forName(driver).newInstance();
    myConnection = DriverManager.getConnection(url,username,password);
    myPreparedStatement = myConnection.prepareStatement(myQuery);
    myResultSet = myPreparedStatement.executeQuery();
    if(myResultSet.next())
    myDataField = myResultSet.getString("dispname");
    out.print(myDataField);
    }
    catch(ClassNotFoundException e){e.printStackTrace();}
    catch (SQLException ex)
    {
    out.print("SQLException: "+ex.getMessage());
    out.print("SQLState: " + ex.getSQLState());
    out.print("VendorError: " + ex.getErrorCode());
    }
    %>

    I run this query to get all database names :
    SELECT datname FROM pg_database

    But I got below error :
    SQLException: The column name dispname was not found in this ResultSet.SQLState: 42703VendorError: 0

    What is my problem?
    Please give me a simple JSP file to run PostgreSQL query and see qurey's result

    Regards


  2. #2
    Super Moderator Sean4u's Avatar
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    Default Re: How to Run PostgreSQL Query in JSP?!

    It says the column 'datname' is not in the table in the FROM clause. It seems to be working properly, maybe you've just made a little mistake with the column name? I see later you retrieve the value of the column 'dispname'. If 'datname' was right, then 'dispname' wouldn't be in the query result. If 'datname' is correct, then you won't be able to retrieve 'dispname'.

  3. The Following User Says Thank You to Sean4u For This Useful Post:

    Akoori (April 15th, 2012)

  4. #3
    Junior Member
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    Default Re: How to Run PostgreSQL Query in JSP?!

    Thanks
    I want to see My Query result
    SELECT datname FROM pg_database this is true PostgreSQL query
    I want JSP file to show result of it for me
    That mean I want a way to see result of query in above JSP file

    Regards

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