I have an application in which I have to implement a function that concats old data in a column with the new data in the same column. The data is managed by DTO. At present the functionality deletes the old value and sets the new value by getter and setter methods. How can I change it so that I get the required functionality? Thanks in advance!
Give a try with below query.
update t set data=concat(data, 'a');
For example current value is apple so after above query the new value will be applea
Refer : this
Related
Let's say I want to have a provide CActiveDataProvider for a CGridView. I need to put a SUM(invitesCount) AS invites into a Provider result. How to retrieve it? I guess I cannot just use $dataProvider->invites?
You need to specify the following in your relationinvites
'invites '=>array(self::BELONGS_TO, 'CampaignFund', 'campaign_id', 'select' => 'SUM(invitesCount)'),
and use this relation in your criteria.
Several other options:
Use CStatRelation
invitesCount=>array(self::STAT,'Invites','foreign_key_field');
The addition of a public property can work. However, the field would only be set if you altered the default find query to include this new condition. This can be done by overriding defaultScope() or creating a new scope and using it whenever invitesCount is required.
Another option would be to create a database view from the required query and create a new Model from that database view.
I'm developing Web Service that has access to database via JDBC. I'm using DAO pattern. I've implemented all necessary methods: findAll, add, update, delete. But I got confused with update method. It has Object as input parameter. But how does he know which field needs to be updated. For example, I need to update field 'name' I use query 'update table set name='smth where id=2' but if I need to update 'surname'?? what is the best practice to tell update method what actually to update?
thank you
You'll need to change your method signature to include a Map of column names and values.
public interface FooDao<K, V> {
// other methods here, of course.
public void update(V target, Map<String, Object> parameters);
}
Have a look at the Spring JDBC template for a nice example of how to design and implement such a thing.
I use this code but its not working in cakephp and the code is:
$inserted = $this->get_live->query("INSERT INTO myaccounts (fname) values('test');
After this im using:
$lead_id = $this->get_live->query("SELECT LAST_INSERT_ID()");
It's working, but only one time.
Try this. Lots less typing. In your controller, saving data to your database is as simple as:
public function add() {
$data = "test";
$this->Myaccount->save($data);
// $this->set sends controller variables to the view
$this->set("last", $this->Myaccount->getLastInsertId());
}
You could loop through an array of data to save with foreach, returning the insertId after each, or you could use Cake's saveAll() method.
Myaccount is the Model object associated with your controller. Cake's naming convention requires a table called "myaccounts" to have a model class called "Myaccount" and a controller called "Myaccounts_Controller". The view files will live in /app/views/myaccounts/... and will be named after your controller methods. So, if you have a function add()... method in your controller, your view would be /app/Views/Myaccounts/add.ctp.
The save() method generates the INSERT statement. If the data you want to save is located in $this->data, you can skip passing an argument in; it will save $this->data by default. save() even automagically detects whether to generate an UPDATE or an INSERT statement based on the presence of an id in your data.
As a rule of thumb, if you're using raw sql queries at any point in Cake, you're probably doing it wrong. I've yet to run into a query so monstrously complex that Cake's ORM couldn't model it.
http://book.cakephp.org/2.0/en/models/saving-your-data.html
http://book.cakephp.org/2.0/en/models/additional-methods-and-properties.html?highlight=getlastinsertid
HTH :)
You can get last inserted record id by (works for cakePHP 1.3.x and cakePHP 2.x)
echo $this->ModelName->getLastInsertID();
Alternately, you can use:
echo $this->ModelName->getInsertID();
CakePHP 1.3.x found in cake/libs/model/model.php on line 2775
CakePHP 2.x found in lib/Cake/Model/Model.php on line 3167
Note: This function doesn't work if you run the insert query manually
pr($this->Model->save($data));
id => '1'
id is a last inserted value
every example I seen shows how to do a update query in linq to sql by doing this.
// grab entity you want to update
entity.UserId = "123"; // update the fields you want to update.
entity.Name = "bob";
Dbcontext.SubmitChanges();
I am wondering can you juse pass in a new object and have it figure it out?
Like could I do this?
Enity myEntity = new Entity();
myEntity.UserId = "123";
myEntity.Name = bob:
// grab entity record
// shove record ito the found record
// it figured out what to update and what no to update
Depending on what exactly you want to do you either need the InsertOnSubmit method, or the Attach method of the respective table (i.e. dbContext.Entities). InsertOnSubmit is used to add a record, while Attach can be used if you want to affect an UPDATE without having to first SELECT the record (you already know the primary key value)
In the case you have the dbContext available and ready, just add InsertOnSubmit:
Entity myEntity = new Entity();
myEntity.UserId = "123";
myEntity.Name = bob:
Dbcontext.InsertOnSubmit(myEntity);
Dbcontext.SubmitChanges();
As the name of the method implies, this will insert your new entity into the database on calling SubmitChanges.
Marc
If you want to do this for performance reasons then you shouldn't worry about it. Linq to Sql will cache objects locally so that just grabbing an entity by ID to modify some fields is very cheap.
It's possible to attach and persist it to the database, however you may want to set a field to check for concurrency (ie LastModified).
If you are going to use the Attach method on the data context, you need to set the primary/composite keys before you attach the entity (so you don't trigger INotifyPropertyChanging, INotifyPropertyChanged events).
I am using annotations to map a basic collection of Strings to an existing entity like this. Inside the parent entity class:
#org.hibernate.annotations.CollectionOfElements
#JoinTable (name="GoalToAchieve_entry", joinColumns=#JoinColumn(name="goalToAchieve_id"))
#org.hibernate.annotations.Sort(type = org.hibernate.annotations.SortType.NATURAL)
private SortedSet<String> entries = new TreeSet<String>();
This works fine. I have a 2-column (goalToAchieve_id and element) table resulting from the join. So I was wondering, how can I add a date/time stamp (auto-generated by MySQL) to each String of the collection. So that I can display a 3rd column with a time stamp every time a new String is added to the collection? The objective is to use a collection of simple objects (Strings) and not have to create a whole new entity (with a time/date field).
Is there a recommended way to do that? I believe even if I provide a timestamp field at the jsp interface which handles the adding of new Strings to the collection, it would still be a hibernate issue, since I need the timestamp to be persisted on the db.
Thanks in advance for any help.
Kindest regards
Hibernate #CollectionOfElements can be used with more than just simple types. You can define a class which contains two fields, your String value, plus a timestamp, and annotate that class with #Embeddable. Hibernate will then persist that to the database as two separate data columns. This class doesn't represent an Entity, just a composite value-type.
The next problem is how do you generate that timestamp. You could do it in java, with the default initialised value of the field being "new Date()" (or whatever).