So here is what I am trying to do.
I have one form which will post data to two tables say table a and table b. Now when I edit the same record I want that data in one table should be updated and in other table it should create new row and add the data.
Can anyone tell me how to achieve this in cakephp
Thanks,
When saving, if the primary key (usually id) of the model is given, cakephp will update, otherwise it will insert.
Related
I am very new to MS Access and I am struggling with some things that seem like they should be the most basic. I have imported a table of data from Excel and have defined the data types for the fields. I have no problem there, but now I want to make a new table that has as a primary key one of the fields from the imported table. It looks like I can manually create this table, set the relationship, and then go back and type in each record associated with the new primary key, but this seems completely ridiculous. Surely there must be a way to automatically create one record for each unique instance in the matching field from the original table. Yet, I've scrolled through hundreds of pages of Access tutorials and Googled the question and found no satisfactory guidance.
Do I completely misunderstand what Access is all about? How do I create a new table with entries from a field on an existing table? What am I missing?
You don't specify which version of Access you are using, the suggestions listed below apply to 2010, but should be similar is other versions.
You can create new tables from existing tables using either a 'Make Table' option after selecting 'Create' -> 'Query Design', or you can manually create your table first, then use an 'Append' query.
Without knowing the design of your table it's hard to get more descriptive.
Are you populating your new table's primary key ahead of time, or relying on Auto Number to do it (preferred method)?
I have 2 tables with a one-to-many relationship. I have another 2 similar tables with the same relationship in the same database.
How to copy a record plus its associated records from one table pair to another table pair in the same database in Cakephp?
I am using Cakephp 2.4.5
Thank you very much.
This link might help you.
You have to use 'deep' => true option with saveAll() method while saving associated models details.
I know getting the id of a record from a db table in CakePHP is easy. I want to get the "future" id of a "future" record of a table, that is, I'll insert a record, but before inserting, I want to get its id, which will be generated by db after insertion is completed(the id is int, Auto Increment). Thanks.
Even the database itself doesn't know what ID it's going to use until the very moment after the record is saved.
You can't (in a multi-user system) ask in advance what the ID is going to be because 20 other records may have been inserted between the time you ask what the ID is going to be, and when you insert your record (with an ID that was used 20 records ago.) This is called a 'Race Condition'.
Here's what will happen:
You: DB - what's the next ID please?
DB: (Does a max() on the column) 21!
You: Great! I'll use that!
(meanwhile 20 other records get inserted by other users)
You: Hi DB, I'd like to insert this record using ID 21 like you told me!
DB: Oops - sorry - that ID has already been used :'-(
You don't NEED to know the record in advance. If you structure your save data correctly, and use CakePHP's saveAccociated() method, CakePHP will insert the correct ID as the foreign key value for all your related data.
The only way to have a predictable ID is to create it yourself. Remember - it MUST be non-null and unique (the definition of a primary key).
Save yourself many, many future primary key clashes and stick to the cake method :-)
One option is you can get the current max id from mysql and then just increment the value. If you have alot of operations going on this might cause some trouble with your site. But you could use:
$this->Model->query("SELECT MAX(id) as max FROM `your_table_name`");
This would get you the max id of that table currently then you can do a +1
Another option would be to get the ID after you save, then update your record with that ID. For example cakephp has a method for this.
$this->Model->getLastInsertID();
$this->Model->updateAll($fields, $conditions)
Reference updateAll: http://book.cakephp.org/2.0/en/models/saving-your-data.html#model-updateall-array-fields-array-conditions
I have an table on which multiple records.
if user(A) get record from table then others user can not get that record particular record that is retrieve by User(A) what should i do to reslove this
You can add a locked bool column to the table, to signify that the record is locked by some user. Rather than a bool, you can reference the user_id that has locked the row. You'll have to do this in your application code, since sql-server cannot do this work for you out of the box.
As i see in your comment,You can create new column or table to store id of user and flag accessed in that. While accessing records use this relationship.
Or please elaborate your question and if possible provide an table structure
I'm writing my first database application and I've got an ambiguity I can't seem to find an answer for. I have an id field that is the identity set to auto-increment. My issue is trying to determine when the field is incremented. Is the field incremented when I call an instance of the object, when I call the AddObject method of the ObjectContext class, or when I call the SaveChanges method from an Entity model.
In my relational database each table has both a unique ID for that table and one that represents a group of users. After I create an instance of an object for that table I want to run a query (LINQ) that searches two tables to match two records and from one of those tables copy that group ID back to the individual user.
That or it is blatently obvious I know nothing about how relational databases work,
The identity field is handled by the database. It is created by the database when the row is inserted. The generated id is read back by SaveChanges and the entity object is updated.
WHen you add a new row to the database the counter is incremented.
If you have an ambiguity, this usually means that two tables fields are the same name, and your query doesn't know which one you want. Can be solved by defning which table the column is ment for.
I don't know LINQ, so hopefully someone can give you a more direct answer.