JDBC-ODBC SQLException：常规错误

Question

I am using JDK 1.6. With that I want to connect to an Access database. For that I've registered a System DNS & trying to connect that database using JDBC-ODBC connection.

When I connect it & test it by firing a simple query to check whether connection has been established properly or not.

Here is my code snippet to execute query.

public void testConnection() {
    Connection conn = DBUtil.getConnection();
    Statement stmt = null;

    try {
        stmt = conn.createStatement();

        ResultSet rs = stmt.executeQuery("SELECT id FROM inventory");

        System.out.println("Connection Successful");
    } catch (Exception ex) {
        ex.printStackTrace();
    } finally {
        try {
            if (stmt != null) {
                stmt.close();
            }

            conn.close();
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }
}

I am calling testConnection() method more than once.

Now the matter is that the query works fine for the first time, rest of three times it gives error, which is mentioned below.

java.sql.SQLException: General error
at sun.jdbc.odbc.JdbcOdbc.throwGenericSQLException(JdbcOdbc.java:7086)
at sun.jdbc.odbc.JdbcOdbc.SQLAllocStmt(JdbcOdbc.java:173)
at sun.jdbc.odbc.JdbcOdbcConnection.prepareStatement(JdbcOdbcConnection.java:465)
at sun.jdbc.odbc.JdbcOdbcConnection.prepareStatement(JdbcOdbcConnection.java:443)

Please let me know where the thing goes wrong?

Note : I am running the program on Windows 7, 64 bit variant. Registered datasource using 32 bit driver on local machine (From path: %windir%/SYSWOW64/odbcad32.exe )

Answer 1

I am really not sure about this, but try something like this:

public void testConnection() {
    Connection conn = null;
    PreparedStatement pre =null;
    ResultSet rs =null;

    try {
        conn = DBUtil.getConnection();
        PreparedStatement pre = conn.prepareStatement("select id from inventory");
        rs = pre.executeQuery();

        System.out.println("Connection Successful");
    } catch (Exception ex) {
        ex.printStackTrace();
    } finally {
            conn.close(); 
    }
}