Question: Can We Use TCL Commands In Trigger?

What are different transaction control commands with examples?

The following commands are used to control transactions.COMMIT − to save the changes.ROLLBACK − to roll back the changes.SAVEPOINT − creates points within the groups of transactions in which to ROLLBACK.SET TRANSACTION − Places a name on a transaction..

Is it possible to use transaction control statements in database triggers?

It is not possible. As triggers are defined for each table, if you use COMMIT of ROLLBACK in a trigger, it affects logical transaction processing.

Is TCL TK still used?

Desktop GUI Applications In the early years, Tk helped establish Tcl’s popularity as the only sane way to write GUI applications under Unix and X11. … In modern times, Tk is still the leader when it comes to delivering a high level GUI cross-platform toolkit that naturally fits in with dynamic languages.

Who owns TCL?

TCL ElectronicsKey peopleLi Dongsheng (Chairman) Wang Cheng (CEO)Revenue46,990,000,000 Hong Kong dollar (2019)ParentTCL Industries HoldingsChinese nameSimplified ChineseTCL 电子控股有限公司15 more rows

How do I know TCL version?

How can I check the device’s model number, Android version and Kernel version? You can check the information by accessing into main menu -> “Settings” -> “System”-> “About phone”.

Can we use commit in trigger?

Trigger should not commit and cannot commit. Committing in a trigger usually raises an exception unless it happens into autonomous transaction. When you open connection, Oracle creates session for it.

How does TCL work?

Tcl works by processing commands. … Each line of a Tcl script is a command, and the first word of each line is the name of the command, and any other words are arguments for the command. Tcl looks up the code associated with that name and invokes it.

Is TCL TK dead?

Tk, Tcl’s windowing system was the envy of the scripting world. … No matter how good Tcl is at any of these things, over time more popular languages have gotten good enough. That has slowly pulled momentum away from Tcl. It isn’t dead, but it isn’t moving very fast either.

Is TCL a good brand?

Overall, TCL TVs offer good picture quality and great features at a low price. Although they aren’t as feature-packed or as well-built as more expensive models, their TVs typically offer great value. If you need a simple TV with a good smart system, you should be happy with most of TCL’s offerings.

What is TCL commands?

TCL (Transaction Control Language) : Transaction Control Language commands are used to manage transactions in the database. These are used to manage the changes made by DML-statements. It also allows statements to be grouped together into logical transactions.

What does TCL TK stand for?

Tool Command LanguageTCL/TKAcronymDefinitionTCL/TKTool Command Language/Tool Kit

Can we commit after rollback?

A transaction is a sequence of SQL statements that Oracle Database treats as a single unit. … After you commit the transaction, the changes are visible to other users’ statements that execute after the commit. You can roll back (undo) any changes made during the transaction with the ROLLBACK statement (see ROLLBACK.

Why is TCL used?

It is commonly used embedded into C applications, for rapid prototyping, scripted applications, GUIs, and testing. Tcl interpreters are available for many operating systems, allowing Tcl code to run on a wide variety of systems.

Is commit needed after insert?

So yes, by default, if you’re just using INSERT , the records you insert will be committed, and there is no point trying to roll them back. (This is effectively the same as wrapping each statement between BEGIN and COMMIT .)

Why bulk collect is faster in Oracle?

Since the BULK COLLECT fetches the record in BULK, the INTO clause should always contain a collection type variable. The main advantage of using BULK COLLECT is it increases the performance by reducing the interaction between database and PL/SQL engine.