foreign-keys

Goal : I want to have importJobId in ImportJob as foreign key for id of allocation table, such that when we have importJobId then and then only we can have id in allocation as without Job there cannot be any allocations. ImportJob table has composite primary key as [ORGID,IMPORTJOBTYPE] and am trying to get create foreign key relationship in hibernate using <id name="id" column="ID"> <generator class="native"/> </id> <many-to-one name="importjobid" class="com.delta.pdo.admin.ImportJob" cascade="save-update"/> in Allocation.hbm.xml which is not working out and am getting error message as:

I'm getting this error in MySQL create. I'm doing: CREATE TABLE `blogReply` ( `Id` INT(24) NOT NULL AUTO_INCREMENT COMMENT 'Primary Key of This Table', `blogId` INT(24) NOT NULL COMMENT 'Blog where this reply was posted', `userId` INT(24) NULL COMMENT 'User the blog was posted by', `name` VARCHAR(100) NULL DEFAULT 'Unknown' COMMENT 'The Name of the user that the reply was posted by', `email` VARCHAR(100) NULL DEFAULT 'Unknown' COMMENT 'The Email of the user that the reply was posted by', `http` VARCHAR(300) NULL DEFAULT 'Unknown' COMMENT 'The Webaddress of the user that the reply was posted by

I'm trying my best to persuade my boss into letting us use foreign keys in our databases - so far without luck. He claims it costs a significant amount of performance, and says we'll just have jobs to cleanup the invalid references now and then. Obviously this doesn't work in practice, and the database is flooded with invalid references. Does anyone know of a comparison, benchmark or similar which proves there's no significant performance hit to using foreign keys? (Which I hope will convince him) There is a tiny performance hit on inserts, updates and deletes because the FK has to be checked.

I was working on creating some tables in database foo , but every time I end up with errno 150 regarding the foreign key. Firstly, here's my code for creating tables: CREATE TABLE Clients ( client_id CHAR(10) NOT NULL , client_name CHAR(50) NOT NULL , provisional_license_num CHAR(50) NOT NULL , client_address CHAR(50) NULL , client_city CHAR(50) NULL , client_county CHAR(50) NULL , client_zip CHAR(10) NULL , client_phone INT NULL , client_email CHAR(255) NULL , client_dob DATETIME NULL , test_attempts INT NULL ); CREATE TABLE Applications ( application_id CHAR(10) NOT NULL , office_id INT NOT

Howdy, I have a problem where i need a cascade on multiple foreign keys pointing to the same table.. [Insights] | ID | Title | | 1 | Monty Python | | 2 | Spamalot | [BroaderInsights_Insights] | broaderinsight_id | insight_id | | 1 | 2 | Basically when either record one or two in the insights table is deleted i need the relationship to also be deleted.. I've tried this: CREATE TABLE broader_insights_insights(id INT NOT NULL IDENTITY(1,1), broader_insight_id INT NOT NULL REFERENCES insights(id) ON DELETE CASCADE, insight_id INT NOT NULL REFERENCES insights(id) ON DELETE CASCADE, PRIMARY KEY(id))

I'm using SQLite with C# and have some tables with foreign keys defined. Now, I know that by default foreign key constraints are not enforced in SQLite, but I'd like to turn them ON. Is it possible to do this through code? I have looked up a related question , but I'm not sure how to do it through C# code. I'm using the latest plug-in of SQLite available for Visual Studio 2008 for designing my tables. conn.Open(); SQLiteCommand cmd = new SQLiteCommand("PRAGMA foreign_keys = ON", conn); cmd.ExecuteNonQuery(); conn.Close(); I need this change to persist when this connection is reopened. Is it

What I would like to do is to display a single form that lets the user: Enter a document title (from Document model) Select one of their user_defined_code choices from a drop down list (populated by the UserDefinedCode model) Type in a unique_code (stored in the Code model) I'm not sure how to go about displaying the fields for the foreign key relationships in a form. I know in a view you can use document.code_set (for example) to access the related objects for the current document object, but I'm not sure how to apply this to a ModelForm. My model: class UserDefinedCode(models.Model): name =