blackboard constraint violation error

How do I fix a blackboard'sign on error'error?

Caused by: org.postgresql.util.PSQLException: ERROR: null value in column "crsmain_pk1" violates not-null constraint Symptoms: Membership SIS integrations can fail due to …

Why can't I access blackboard as a student?

Pay a visit o the Student Accounts Office and find out if you have any holds as some holds might disable you access to Blackboard. If you see this error, you will need to clear the history, cache, and cookies on your web browser. Below are links for instructions for those steps on Google Chrome and on Firefox (the two recommended browsers for Blackboard SaaS).

What is a constraint violation in SQL Server?

Jan 11, 2022 · For the above Get endpoint if the client sends an improper value for class param (such as 0, 13, null etc.) which doesn’t satisfy the validation then Spring boot will throw Constraint violation exception. Now let’s see how we can handle it using ControllerAdvice.

What is the violation of referential integrity constraint?

Jun 29, 2012 · It then powers on and finds the UNIQUE constraint violation. As it wasn’t judged as a severe ‘batch-aborting’ error, SQL Server only rolled back the two offending inserts. If, however, we substitute SET XACT_ABORT ON then the entire batch is aborted at the first error, leaving the two first insertions in place.

Transactions

Transactions enable you to keep a database consistent, even after an error. They underlie every SQL data manipulation in order to enforce atomicity and consistency.

Autocommit transaction mode

Let’s create a table that allows us to be able to make a couple of different constraint violations. You’ll have to imagine that this is a part of a contact database that is full of constraints and triggers that will defend against bad data ever reaching the database. Naturally, there will be more in this table.

Explicit Transactions

When we explicitly declare the start of a transaction in SQL by using the BEGIN TRANSACTION statement, we are defining a point at which the data referenced by a particular connection is logically and physically consistent.

Nested transactions and Savepoints

Transactions can be misleading because programmers equate them to program blocks, and assume that they can somehow be ‘nested’. All manner of routines can be called during a transaction, and some of them could, in turn, specify a transaction, but a rollback will always go to the base transaction.

The Consequences of Errors

In our example, we’re dealing mainly with constraint violations which lead to statement termination, and we’ve contrasted them to errors that lead to batch abortion, and demonstrated that by setting XACT_ABORT ON, statement termination starts to behave more like batch-abortion errors.

Conclusion

To manage transactions properly, and react appropriately to errors fired by constraints, you need to plan carefully. You need to distinguish the various types of errors, and make sure that you react to all of these types appropriately in your code, where it is possible to do so.