[Sybase JDBC Driver]Object has been closed

Question

Hi,
I am getting the following error when accessing a datasource in an EJB on Weblogic using the Data Direct Drivers.
java.sql.SQLException: [DataDirect][Sybase JDBC Driver]Object has been closed.
The code works every other time. the first time through it works the second time I get the error.
Any insite would be appricated.
Here is my code
public String test(String id)
System.out.println ("test1");
DataSource ds = null;
Connection conn = null;
PreparedStatement stmt = null;
PreparedStatement stmt2 = null;
String ret = "?????";
try
System.out.println ("read data - prepare");
InitialContext ic = new InitialContext();
ds = (DataSource)ic.lookup("java:comp/env/jdbc/dataconn");
conn = ds.getConnection();
String sql = "SELECT * FROM myTable WHERE ID = ?";
System.out.println ("read data - conn.prepareStatement(sql);");
stmt = conn.prepareStatement(sql);
stmt.setString(1, id);
// stmt.setMaxRows(1000);
System.out.println ("read data - stmt.executeQuery();");
ResultSet rs = stmt.executeQuery();
System.out.println ("read data - read");
if(!rs.next())
ret = "Not found";
else
ret = "found";
sql = "UPDATE myTable SET column1 = column1 + 1 WHERE ID = ?";
System.out.println ("update data - prepare");
stmt2 = conn.prepareStatement(sql);
stmt2.setString(1, id);
ret = ret + stmt2.executeUpdate();
System.out.println ("update data - update");
catch(Exception e)
e.printStackTrace();
finally
try
stmt.close();
catch(Exception exception1) { }
try
stmt2.close();
catch(Exception exception1) { }
try
conn.close();
catch(Exception exception1) { }
stmt = null;
stmt2 = null;
conn = null;
return ret;
}

Answer 1

Hi. What version of weblogic, and can you print the whole stacktrace?
That way I'll know which object is already closed. This hints at an
already-fixed bug, but I'm not sure yet... And tell me what happens
if you close your result set after you do your call to next(). Lastly,
you can save some DBMS traffic if you change the query to:
"SELECT 1 FROM myTable WHERE ID = ?"
Then regardless of how wide the table is, and whether the table data
is in DBMS memory, as long as there's an index on ID, the query only
needs to use the index, not the data page to answer. If there's an
index entry for your ID value, you'll get one row with 1 in it, else
nothing.
thanks
Joe
Scot McReynolds wrote:
Hi,
I am getting the following error when accessing a datasource in an EJB on Weblogic using the Data Direct Drivers.
java.sql.SQLException: [DataDirect][Sybase JDBC Driver]Object has been closed.
The code works every other time. the first time through it works the second time I get the error.
Any insite would be appricated.
Here is my code
public String test(String id)
System.out.println ("test1");
DataSource ds = null;
Connection conn = null;
PreparedStatement stmt = null;
PreparedStatement stmt2 = null;
String ret = "?????";
try
System.out.println ("read data - prepare");
InitialContext ic = new InitialContext();
ds = (DataSource)ic.lookup("java:comp/env/jdbc/dataconn");
conn = ds.getConnection();
String sql = "SELECT * FROM myTable WHERE ID = ?";
System.out.println ("read data - conn.prepareStatement(sql);");
stmt = conn.prepareStatement(sql);
stmt.setString(1, id);
// stmt.setMaxRows(1000);
System.out.println ("read data - stmt.executeQuery();");
ResultSet rs = stmt.executeQuery();
System.out.println ("read data - read");
if(!rs.next())
ret = "Not found";
else
ret = "found";
sql = "UPDATE myTable SET column1 = column1 + 1 WHERE ID = ?";
System.out.println ("update data - prepare");
stmt2 = conn.prepareStatement(sql);
stmt2.setString(1, id);
ret = ret + stmt2.executeUpdate();
System.out.println ("update data - update");
catch(Exception e)
e.printStackTrace();
finally
try
stmt.close();
catch(Exception exception1) { }
try
stmt2.close();
catch(Exception exception1) { }
try
conn.close();
catch(Exception exception1) { }
stmt = null;
stmt2 = null;
conn = null;
return ret;