Skip to main content

Oracle Database : Quickly test if the directory you are writing to is writable and configured in utl_file or Oracle directory object.

There are times when writing a code when we want to write files with Oracle utl_file package, but we do not have access to v$parameter tables or do not know if the directory object exists in Oracle or not.

There are also many times cases when you are tracing error in multi hundres of lines of code and do not know if the file writing is causing error or its some other code in your plsql.

One can quickly test file writing is happening or not with the help below small code.


DECLARE  ---------- Oracle utl file write test.
   L_HANDLER   UTL_FILE.FILE_TYPE;
BEGIN
   L_HANDLER := UTL_FILE.FOPEN ('/xfer/data', 'utl_test.txt', 'W');
   UTL_FILE.PUTF (L_HANDLER, 'UTL_FILE Test Success');
   UTL_FILE.FCLOSE (L_HANDLER);
END;

Comments

Popular posts from this blog

Introduction to Oracle Analytical functions , rank , denserank.

In this video we tried to demonstrate how oracle anaytical function works. How to do Top N query with oracle's rank and dense_rank function. Also explained is how outputs and functionality of rank and dense_rank differs , what should be used when. The demonstration video is from Linux Mint OS and I have used my own Query Light application. Hope you find it enlightening.   Here are some of the screen prints.  Use of Oracle Rank Analytical Function. Oracle Top N Query using rank analytical functions.

Use the Microsoft Visual Studio Code(VScode) with Java Maven project.

The VS Code is the go to editor now a days for the latest technologies and scripting options. VS Code as we all know works seamlessly with Python and JavaScripts, and offcourse the .NET family. But VS Code has many extensions which makes it big Java IDEs run for their money. Lets explore what we could do with VSCode if we are Java developer. Install VScode , no brainer. Jus type download Visual Studio code in google. Alrright once we have VSCode. Open it. Install Maven and Java extension. 2. Go to files and a small window will now appear on left side navigation bar. 3. Select New Maven project. 4. Select the archtype from dropdown. 5. As usual input the grpid, artifactid etc. 6. Done. Go through a video which has much detailed navigation flow. Till next time !!!

Oracle Database find duplicate records on certain column in a table.

This is a Beginner level article but can be referred readily by guys using Oracle Database moderately for a refernence. You can identify the duplicate records in Oracle Table by using a group by clause. You need to group by column / columns from which you are trying to identify the duplicates , use count() function to identify the duplicates : expression is self exploratory having count () > 1 . Ex 1 : Identify duplicates first names from employees table.  Note in this context : Employee records is not necessarily duplicate we are only trying to find employees with same first name. select empl_first_name , count(empl_first_name) from employees group by empl_first_name having count(empl_first_name) > 1 Ex 2 : Identify duplicates or repeats based on 2 or more columns. select empl_first_name , empl_last_name , count(empl_first_name) from employees group by empl_first_name , empl_last_name having count(1) > 1 Identify duplicate / repeats based on 2 or mo...