I have relation many to many with extra fileds in linking table(mapping in xml files). Using criteria api how to add restrictions to name of product?
public class Recipe implements Serializable{
private int id_re;
private String name;
private Set<ProductRecipe> listOfRecipe_Product = new HashSet<>(0);
}
public class ProductRecipe implements Serializable{
private ProductRecipeMapping id;
private float quantity;
}
public class ProductRecipeMapping implements Serializable{
private Product product;
private Recipe recipe;
}
public class Product implements Serializable{
private int id_p;
private String name;
}
Mapping:
<class entity-name="recipe" name="Recipe" table="recipe">
<id name="id_re" type="java.lang.Integer">
<column name="id_re" />
<generator class="identity" />
</id>
<set name="listOfRecipe_Product" table="recipe_product" lazy="false" fetch="select" cascade="all">
<key>
<column name="id_re" not-null="true" />
</key>
<one-to-many entity-name="productRecipe" />
</set>
</class>
<class entity-name="productRecipe" name="ProductRecipe" table="recipe_product">
<composite-id name="id" class="ProductRecipeMapping" >
<key-many-to-one name="recipe" entity-name="recipe" column="id_re" />
<key-many-to-one name="product" entity-name="product" column="id_p" />
</composite-id>
<property name="quantity" type="float" column="quantity" />
</class>
<class entity-name="product" name="Product" table="product">
<id name="id_p" type="java.lang.Integer" column="id_p">
<generator class="identity" />
</id>
<property name="name" column="name" type="java.lang.String" not-null="true" length="255"/>
</class>
EG I use criteria for get recipe with name test:
Criteria cr = session.createCriteria(Recipe.class);
cr.add(Restrictions.eq("name", "test"));
but I don't know to get all recipes with list name of products something like cr.add(Restrictions.eq("product.name", "test")); (but not work)
I use 2 idea to resolve this problem but nothing work:
1) Restrictions.eq("listOfRecipe_Product.id.product.name", "test")
but i get error org.hibernate.QueryException: could not resolve property: listOfRecipe_Product.id.product.name of: recipe
2)
cr.createCriteria("listOfRecipe_Product")
.createCriteria("id")
.createCriteria("product")
.add(Restrictions.eq("name", "test"));
I get error org.hibernate.QueryException: Criteria objects cannot be created directly on components. Create a criteria on owning entity and use a dotted property to access component property: listOfRecipe_Product.id
org.hibernate.QueryException: Criteria objects cannot be created directly on components. Create a criteria on owning entity and use a dotted property to access component property: listOfRecipe_Product.id
You will need to create aliases in order to add constraints to mapped entities;
eg:
Criteria cr = session.createCriteria(Recipe.class)
.createAlias("listOfRecipe_Product", "listOfRecipe_Product")
.createAlias("listOfRecipe_Product.id", "id")
.createAlias("id.product", "product")
.add(Restrictions.eq("product.name", "test"));
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