orm

问题 I have pretty much an identical issue as Dependency injection with custom Doctrine 2 hydrator, but I need to inject a service into a custom data type , not into a hydrator. The solution in the referenced question is relies on duplicating and modifying doctrine source code as Doctrine initializes the classes itself. Hopefully another approach is viable to custom data types? This is for a Symfony3 application, if there could be some magic to be applied there. 回答1: Per the comments in the

问题 I am having an issue with mapping a 3rd level entity please consider the following code: Parent Entity : @Entity @Table(name = "Tree") public class Tree { @Id @Column(name="Tree_Id") @GeneratedValue(strategy = GenerationType.Identity) private Integer id; @OneToMany(mappedBy = "parentTree", cascade = CascadeType.ALL, orphanRemoval = true) private Set<Branch> branches; //Getters And Setters public Branch addBranch(Branch branch) { getBranch().add(branch); branch.setTree(this); return branch; }

问题 I have an SQL query which I would like to express using the sequelize query syntax. DB Scheme Users: ( id , username, ...) Groups: ( id , name, ...) User_Groups: ( id , #groupId, #userId) Query Description Retrieve all users that are not yet part of a particular group. Raw SQL Query (working) SELECT User.id, User.email FROM Users as User WHERE User.id NOT IN ( SELECT User_Group.userId FROM User_Groups as User_Group WHERE User_Group.groupId = ${groupId} ) Where I'm blocked I tried to simulate

问题 I am trying to get the practice area record of lawyers from practice_areas table along side each time I get a lawyer's record from lawyer_profiles_table. This two tables (practice_areas and lawyer_profiles) are related with a pivot table named (lawyer_practice_area) This code below are from the LawyerProfile Model public function practice_areas() { return $this->belongsToMany(PracticeArea::class, "lawyer_practice_area", "practice_area_id", "lawyer_id"); } I tried getting it through an

问题 I have a model in GORM with Postgres as database. The model is like this type Country struct { gorm.Model Name string Population int64 Regions []Region } type Region struct { gorm.Model Name string Cities []City CountryID uint `sql:"type:bigint REFERENCES countries(id) ON DELETE CASCADE" json:"-"` } type City struct { gorm.Model Name string Comment string RegionID uint `sql:"type:bigint REFERENCES regions(id) ON DELETE CASCADE" json:"-"` } When I create a new record from model, I invoke

问题 I'm trying to get the last record in one table connected to another one using many-to-one relationship in django models. Here's my django models: class DataCollecttion(models.Model): default_name = models.CharField(max_length=100) class NameHistory(models.Model): old_name = models.CharField(max_length=100) collection_data = models.ForeignKey(DataCollection, on_delete=models.CASCADE, null=True) Here I created a sample data for DataCollection table: And here's the sample data for NameHistory

问题 I am trying to create a blog using Flask. Every post can have multiple tags also every tag could be associated with multiple posts. So I created a many-to-many relationship. My questions is how do i save multiple tags when creating a new post. And since every post can have different number of tags how do i show this is in the form? Also, how can i create new tags along with the post and then use those tags with other posts? This is models.py - postcategory = db.Table('tags', db.Column('posts

问题 I am trying to create a blog using Flask. Every post can have multiple tags also every tag could be associated with multiple posts. So I created a many-to-many relationship. My questions is how do i save multiple tags when creating a new post. And since every post can have different number of tags how do i show this is in the form? Also, how can i create new tags along with the post and then use those tags with other posts? This is models.py - postcategory = db.Table('tags', db.Column('posts

问题 I am using the below Hibernate code to filter workFlowName . crt.add(Restrictions.like("workFlowName", workFlow, MatchMode.ANYWHERE)); // crt is the criteria The problem is when I pass the value to workFlow from web (TextBox).it fetching the value correctly (I am passing sym in text box if fetch 10 records.if i pass the same value like %sym% again it is fetching same record). Whether the criteria will omit when it see %% as argument? 回答1: Hibernate does not escape special chars in like (e.g.

问题 I encountered an issue where my Laravel's Eloquent Model does not give me the value of the column called 'id' it just turn to be an integer (0) instead of a string. I though the column was somehow protected but in other Models where the 'id' is an intenger it return the value just fine. Question: Can't I use VARCHAR for primary keys? Note: I have to create more tables with respective models where the primary key need to be a string; I'm kinda new Laravel Migration: Schema::create('country',