check-constraints

Does anyone manage to check OCL constraints on a class diagram modeled in Eclipse Papyrus ? I have definied a simple test profile with only one constraint on a stereotype attribute : {OCL} self.property > 0 The stereotype extends the Property metaclass so I applied it on a class attribute and I set the property of the stereotype to 0. But I never got an error with the Validation > Validate Model command from the context menu. Any help would be much appreciate. Thanks by advance. I answer to myself for other people who might have the same problem. OCL constraints checking doesn't work for

i'v been learning SQL for the last week but I am unsure how to correctly add a case statement within a check constraint. Can anybody give me any pointers? I have the following grade table: CREATE TABLE Grade ( salary_grade char(1) NOT NULL CHECK (salary_grade = UPPER(salary_grade)), CONSTRAINT ck_grade_scale CHECK( CASE WHEN salary_grade = '[A-D]' THEN salary_scale = 'S1' WHEN salary_grade = '[D-G]' THEN salary_scale = 'S2' END) salary_scale char(2) DEFAULT 'S1' NOT NULL, CONSTRAINT pk_grade PRIMARY KEY (salary_grade), CONSTRAINT ck_salary_grade CHECK (REGEXP_LIKE(salary_grade, '[A-G]', 'c')),

I have a table with three fields, say a, b, c. I would like to add a constraint ensuring that if a is not null, then also b and c are not null. I have done that using following SQL ALTER TABLE sample ADD CONSTRAINT no_nulls CHECK (CASE WHEN a IS NOT NULL THEN b IS NOT NULL AND c IS NOT NULL END) Is there a way to achieve same effect using hibernate annotation @Check? I can't find a helpful example with that annotation, do developers tend not to use it at all? Yes it is possible if @Check is used at class level like this: @Entity @Check(constraints = "COL_A IS NULL OR (COL_B IS NOT NULL and COL

I'd like to know if there are some benchmark to compare how much cost insert some check constraints on a table of 60 columns where on 20 i'd like to insert a constraints of NotEmpty and on 6 rows NotNull. My case is that i have on my table Empty values and Null values (that in my case means always "no data"). I'd like to unify that data values with just one. That's why I'm thinking to insert NotEmpty constraints on columns, because as i have read null value are not heavy (in byte size) as like empty values (and respect his real meaning). But from other side NotNull Constraint are more deep

Say I have two tables, Parent and Child. Parent has a MaxChildren (int) field and Child has an Enabled (bit) field and a ParentID (int) field linking back to the parent record. I'd like to have a constraint such that there can't be more than MaxChildren records for each parent where Enabled = 1. This would mean that any attempt to insert or update any record in the Child table will fail if it goes over the applicable MaxChildren value, or any attempt to lower MaxChildren to below the current number of applicable Child records will fail. I'm using MS SQL Server, but I'm hoping there's a

This question already has an answer here: CHECK constraint in MySQL is not working 8 answers Here I want to create 2 CHECK constraint before the record insert to the database. ALTER TABLE SubjectEnrollment ADD CONSTRAINT register CHECK (register <= classSize AND register >=0), ADD CONSTRAINT available CHECK (available <= classSize AND available >= 0); register attribute should not more than classSize attribute and less than 0. available attribute should not more than classSize attribte and less than 0. When I type in this syntax in MySql Workbench, it complaints "Syntax Error: unexpected