Unable to fetch database table from webdynpro application

Question

Hello,
I have a Webdynpro application trying to fetch data from the database table. I have used the following code to get the connection to the database and execute the sql statement.
          InitialContext dbInitContext = new InitialContext();
          Properties sysProperties = System.getProperties();
          String sysname = sysProperties.getProperty("SAPSYSTEMNAME");
          String dbName = "jdbc/" + "SAP" + sysname + "DB";
          DataSource dataSource = (DataSource) dbInitContext.lookup(dbName);
          Connection conn = dataSource.getConnection();
          String SelectStmt = "Select * from INV_CUSTOMER";
          PreparedStatement stmt = conn.prepareStatement(SelectStmt);
          ResultSet resultSet = stmt.executeQuery();
I logged into the database using user superdba in sqlcli, and created the table "INV_CUSTOMER". I am trying to run this application in my sneak preview java installation which comes with maxdb 7.6. But when I run the app, it always throws up the error:
The SQL statement "SELECT * FROM "INV_CUSTOMER"" contains the semantics error[s]: - 1:15 - the table or view >>INV_CUSTOMER<< does not exist
I am new to this concept, so any help would be appreciated.
Thanks,
Ajay

Answer 1

>
Ajay Singh wrote:
> Hi Isaias,
>
> I created a dictionary project with the same structure, and used it in my app. Right now, everytime I run my app, the old data I entered is lost. I need to store data in the table, and reuse those records the next time I run the app. How do I do this?
> Another question I have is, I have created Database Tables inside Local Dictionary of my dictionary project. Does this create a table in the actual database?
> Forgive me, but I am new to this topic.
>
> Thanks,
> Ajay
Hi,
It seems to me like there is more than one issue here. Let me try and help you out with some details.
1.) If you have created the Dictionary project and the code in your original post is not giving you problems then it's good. However, the problem of the data disappearing from your Java Dictionary seems little bit wierd. You need to ensure that you are not running any "delete" command and ensure that the select statement (of it has and conditions) is correct.
2.) As far as where the tables actually reside: When you create the Dictionary tables in a Dictionary Project-  this will actually create a script that will be run on the server that has an installed database (like Oracle, MSSQL Server or MaxDB, UDB). This means that the dictionary tables are just an abstraction of actual database tables.
In order to ensure that you are not deleting the data - debug your Web Dynpro Application or EJB so that you can go through it step by step and see whether all the database statements are correct. Sometimes you may not get an SQL error due to a NullPointer in the dynamic queries as well - so keep a check on that as well.
If you require a more detailed solution - please give us a small piece of code that we can analyse.
Hope that helps.
Thanks.,
p256960.