Pl sql procedure parameter null

When something mutates, it is changing. Something that is changing is hard to analyze and to quantify. In particular, this error occurs when a row-level trigger attempts to read or write the table from which the trigger was fired. Fortunately, the same restriction does not apply in statement-level triggers. In this post, I demonstrate the kind of scenario that will result in an ORA errors. I then show the "traditional" solution, using a collection defined in a package. Then I demonstrate how to use the compound trigger, added in Oracle Database 11g Release1, to solve the problem much more simply.

All the code shown in this example may be found in this LiveSQL script. Read more. October 31, That's the default and only setting for cursor FOR loop optimizations. It offers a sweet spot of improved performance over row-by-row and not-too-much PGA memory consumption. Test to see if that's fast enough likely will be for many cases. An IN parameter lets you pass a value to the subprogram. It is a read-only parameter. Inside the subprogram, an IN parameter acts like a constant.

It cannot be assigned a value. You can pass a constant, literal, initialized variable, or expression as an IN parameter. You can also initialize it to a default value; however, in that case, it is omitted from the subprogram call.

It is the default mode of parameter passing. Parameters are passed by reference. An OUT parameter returns a value to the calling program. Inside the subprogram, an OUT parameter acts like a variable. You can change its value and reference the value after assigning it. Grab mine from LiveSQL. If you'd like to go down that rabbit hole, start here.

Bullet-proof your subprograms with assertion logic to ensure that your program is free of nulls when that is how it should be. See the original article here. Thanks for visiting DZone today,. Edit Profile. Sign Out View Profile. Over 2 million developers have joined DZone.

Then, take steps to avoid that confusion and those errors. Like 2. Join the DZone community and get the full member experience. Join For Free.

First, and most important, remember that: Null is never equal to anything else, including null. END; You can rest assured that the code represented by With that, let's dive into the details. END; But I suggest that you do not. END; Don't worry; Oracle is never going to change this behavior, so you don't have to "take out insurance. Compare the following two blocks.

Instead, you will need to do one of the following: Use a datatype for the parameter that cannot be null. Then take steps in your code to avoid that confusion and those errors. Community Bot 1 1 1 silver badge. Jon Heller Jon Heller Sign up or log in Sign up using Google.

Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown. The Overflow Blog. Podcast Making Agile work for data science. Stack Gives Back Featured on Meta. New post summary designs on greatest hits now, everywhere else eventually. Linked Related