I just learn Hibernate, and have some problems with xml mapping.Error code:
Exception in thread "main" org.hibernate.exception.SQLGrammarException: could not execute statement
Part of database which i want to map looks like this
part of db
In java application i have two entity class, for each of this tables. I donot insert getters setter and constructor here for better readability.
public class OccupiedBedsEntity {
private int id;
private Timestamp since;
private Timestamp to;
private int id_room;
}
public class RoomEntity {
private int id;
private int roomNumber;
private Integer numberOfBeds;
private int id_department;
private int idResponsibleDoctor;
private Set beds;
}
Xml mapping looks like this.
<?xml version='1.0' encoding='utf-8'?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" "http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">
<hibernate-mapping default-cascade="all">
<class name="entity.RoomEntity" table="room" schema="" catalog="medicine">
<id name="id">
<column name="id" sql-type="int unsigned" not-null="true"/>
<generator class="native"/>
</id>
<property name="roomNumber">
<column name="room_number" sql-type="int unsigned" not-null="true"/>
</property>
<property name="numberOfBeds">
<column name="number_of_beds" sql-type="int unsigned"/>
</property>
<property name="idResponsibleDoctor">
<column name="id_responsible_doctor" sql-type="int unsigned" not-null="true"/>
</property>
<property name="id_department">
<column name="id_department" sql-type="int unsigned" not-null="true"/>
</property>
<set name="beds">
<key column="id_room"></key>
<one-to-many class="entity.OccupiedBedsEntity"/>
</set>
</class>
</hibernate-mapping>
<?xml version='1.0' encoding='utf-8'?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" enter code here"http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">
<hibernate-mapping default-cascade="all">
<class name="entity.OccupiedBedsEntity" table="occupied_beds" schema="medicine" catalog="medicine">
<id name="id">
<column name="id" sql-type="int unsigned" not-null="true"/>
<generator class="native"/>
</id>
<property name="since">
<column name="since_" sql-type="datetime" not-null="true"/>
</property>
<property name="to">
<column name="to_" sql-type="datetime" not-null="true"/>
</property>
<property name="id_room">
<column name="id_room" sql-type="int unsigned" not-null="true"></column>
</property>
</class>
</hibernate-mapping>
Maybe i have to change something not in xml, but in java classes?
Error was in this line in occupiesBebsEntity xml mapper.
<class name="entity.OccupiedBedsEntity" table="occupied_beds" schema="medicine" catalog="medicine">
Code should looks like this.
<class name="entity.OccupiedBedsEntity" table="occupied_beds" schema="" catalog="medicine">
Related
I have an AbstractAccount hbm file where i set accountNumber as primarykey. I'am extending this class in my Account.hbm.xml file where I want to over ride this primary key as countryCode and accountNumber composite key. How can i do this?
Abstract.hbm.xml file.
<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
<class name="com.*.*.*.AbstractAccount"
abstract="true"
table="ACCOUNT"
lazy="false">
<id name="accountNumber" type="java.lang.String">
<column name="ACCOUNT_NUMBER" length="16" />
<generator class="assigned" />
</id>
<discriminator column="ACCOUNT_TYPE" type="string"/>
................
</class>
</hibernate-mapping>
Account.hbm.xml
<property name="modifiedDate" type="java.util.Date">
<column name="MODIFIED_DATE"/>
</property>
<property name="countryCode" type="java.lang.String">
<column name="COUNTRY_CODE"/>
</property>
...............
</subclass>
I have tried with adding composite key as below, but it is not working.
<composite-id name="account_country">
<key-property name="countryCode" column="COUNTRY_CODE" />
<key-property name="accountNumber" column="ACCOUNT_NUMBER" />
</composite-id>
Abstract.hbm.xml
<hibernate-mapping>
/* Abstract class properites */
<joined-subclass name="Account" table="tablename">
/* Account class properites */
</join-subclass>
</hibernate-mapping>
I am trying to do a one-to-many relationship between two tables. I have a table called users that has many user_history entries. I defined these tables in mysql and I generated the entities with intellij hibrernate support. The problem is that when i want to insert something in the databse I am receiving the following error Repeated column in mapping for entity: com.UserHistoryEntity
User:
<?xml version='1.0' encoding='utf-8'?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
<class name="com.UsersEntity" table="users" schema="" catalog="protein_tracker">
<id name="id">
<column name="id" sql-type="int" not-null="true"/>
</id>
<property name="name">
<column name="name" sql-type="varchar" length="45" not-null="true"/>
</property>
<property name="total">
<column name="total" sql-type="int" not-null="true"/>
</property>
<property name="goal">
<column name="goal" sql-type="int" not-null="true"/>
</property>
<set name="userHistoriesById" inverse="true">
<key>
<column name="id_user" not-null="true"/>
</key>
<one-to-many not-found="ignore" class="com.UserHistoryEntity"/>
</set>
</class>
</hibernate-mapping>
UserHistory:
<?xml version='1.0' encoding='utf-8'?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
<class name="com.UserHistoryEntity" table="user_history" schema="" catalog="protein_tracker">
<id name="id">
<column name="id" sql-type="int" not-null="true"/>
</id>
<property name="entryDate">
<column name="entry_date" sql-type="datetime" not-null="true"/>
</property>
<property name="entry">
<column name="entry" sql-type="varchar" length="45" not-null="true"/>
</property>
<property name="idUser">
<column name="id_user" sql-type="int" not-null="true"/>
</property>
<many-to-one name="usersByIdUser" class="com.UsersEntity">
<column name="id_user" not-null="true"/>
</many-to-one>
</class>
</hibernate-mapping>
How can I fix this issue?
Mark your Many-To-One mapping for usersByIdUser to insertable = false and updatable = false. This allows the relationship to only be managed by a single property, idUser that you have mapped.
Please have a look at the following
<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
<class name="com.att_marks.students.Attendance_Btech">
<id name="id" type="integer" column="id" >
<generator class="increment"/>
</id>
<property name="year">
<column name="Year" />
</property>
<property name="semister">
<column name="Semister"/>
</property>
<property name="section">
<column name="Section"/>
</property>
<property name="period">
<column name="Period"/>
</property>
<property name="subjectCode">
<column name="Subject_Code"/>
</property>
<property name="date">
<column name="Date"/>
</property>
<property name="status">
<column name="Status"/>
</property>
<union-subclass name="com.att_marks.students.Attendance_Btech_ECE" table="attendance_btech_ece">
</union-subclass>
</class>
</hibernate-mapping>
I have tables named attendance_btech_ece, attendance_btech_cse, attendance_btech_it, and so on. All these tables use the same schema as mentioned above for the Attendance_Btech class. I thought this should work but it isn't.
If the Attendance_Btech_ECE is subclass of Attendance_Btech then should work.
I am getting a hibernate problem. I am trying with no success. I have a schema where there are Category,Attribute,AttributeOption. e.g. a category can be a 'computer', and its respective attribute can be 'RAM','Hard Disk' and e.g. 'RAM' can have attribute option '512MB','1024MB'
When I try the above schema with hibernate everything is OK.
Now I have one other requirement. A 'Category' can have many sub categories. e.g. a 'Computer' can have 'laptop' or 'Notebook' as sub categories. Now these subcategories are of the class Category themselves
then I get this scheme:
1. Category ------>Category
A category can contain many sub categories
e.g. A computer can be a notebook or laptop
2. Category ------>Attribure
A category can have many attribute
A notebook can have RAM , Hard Disk, Screen Size
3. Attribute ------>AttributeOption
An Attribute can have many attribute options
e.g. RAM can be 512 MB, 1024 MB
These are my classes without their getters and setters
Class Category:
public class Category implements IsSerializable
{
private long CategoryId;
private String CategoryName;
private Set <Category> SubCategory=new HashSet <Category> ();
private Set <Attribute> AllAttributes= new HashSet <Attribute>();
}
Category Mapping File:
<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<!-- Generated Dec 16, 2010 8:07:32 AM by Hibernate Tools 3.4.0.Beta1 -->
<hibernate-mapping>
<class name="com.BiddingSystem.Models.Category" table="CATEGORY">
<id name="CategoryId" type="long">
<column name="CATEGORYID" />
<generator class="native" />
</id>
<property name="CategoryName" type="java.lang.String">
<column name="CATEGORYNAME" />
</property>
<many-to-one name="ParentCategory" class="com.BiddingSystem.Models.Category">
<column name="PARENTCATEGORYID" />
</many-to-one>
<set name="SubCategory" inverse="true" lazy="true" cascade="all" fetch="join">
<key>
<column name="PARENTCATEGORYID" />
</key>
<one-to-many class="com.BiddingSystem.Models.Category" />
</set>
<set name="AllAttributes" table="ATTRIBUTE" inverse="false" lazy="true">
<key>
<column name="CATEGORYID" />
</key>
<one-to-many class="com.BiddingSystem.Models.Attribute" />
</set>
</class>
</hibernate-mapping>
Class Attribute:
public class Attribute
{
private long AttributeId;
private String AttributeName;
private Set <AttributeOption> Options= new HashSet <AttributeOption>();
}
Attribute Mapping File:
<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<!-- Generated Dec 16, 2010 5:25:09 AM by Hibernate Tools 3.4.0.Beta1 -->
<hibernate-mapping>
<class name="com.BiddingSystem.Models.Attribute" table="ATTRIBUTE">
<id name="AttributeId" type="long">
<column name="ATTRIBUTEID" />
<generator class="native" />
</id>
<property name="AttributeName" type="java.lang.String">
<column name="ATTRIBUTENAME" />
</property>
<set name="Options" table="ATTRIBUTEOPTION" inverse="false" cascade="all">
<key>
<column name="ATTRIBUTEID" />
</key>
<one-to-many class="com.BiddingSystem.Models.AttributeOption" />
</set>
</class>
</hibernate-mapping>
Class AttributeOption:
public class AttributeOption
{
private long AttributeOptionId;
private String Option;
private String SQLValue;
}
Attribute Mapping File:
<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<!-- Generated Dec 16, 2010 5:25:09 AM by Hibernate Tools 3.4.0.Beta1 -->
<hibernate-mapping>
<class name="com.BiddingSystem.Models.AttributeOption" table="ATTRIBUTEOPTION">
<id name="AttributeOptionId" type="long">
<column name="ATTRIBUTEOPTIONID" />
<generator class="native" />
</id>
<property name="Option" type="java.lang.String">
<column name="OPTION" />
</property>
<property name="SQLValue" type="java.lang.String">
<column name="SQLVALUE" />
</property>
</class>
</hibernate-mapping>
I am trying the following. I am not getting any error but It is not saving the 'Laptop' which is a category of 'computer' else everything is being saved. So i think the problem is with this part from the category mapping file:
<set name="SubCategory" table="CATEGORY" cascade="all">
<key>
<column name="CATEGORYID" />
</key>
<one-to-many class="com.BiddingSystem.Models.Category" />
</set>
This is part of my program
Category C=new Category();
C.setCategoryName("Computer");
AttributeOption R512= new AttributeOption();R512.setOption("512");R512.setSQLValue("512");
AttributeOption R1024= new AttributeOption();R1024.setOption("1024");R1024.setSQLValue("1024");
Category C0= new Category();
C0.setCategoryName("Laptop");
C.getSubCategory().add(C0);
Attribute RAM= new Attribute();
RAM.setAttributeName("RAM");
RAM.getOptions().add(R512);RAM.getOptions().add(R1024);
C.getAllAttributes().add(RAM);
Transaction tx = null;
try
{
tx=session.beginTransaction();
tx.begin();
session.saveOrUpdate(C);
tx.commit();
return true;
}
catch (Exception e)
{
tx.rollback();
e.printStackTrace();
return false;
}
Something seems wrong with this:
C0.getSubCategory().add(C0);
Shouldn't it be:
C.getSubCategory().add(C0);
Hummm, I see some place for improvement in this code :
First, you should use the persist() method to persist your entities.
Second, to persist a whole object graph, you must either a) persist the sub-objects manually, then the "main" object ; or b) use the Cascade parameter on your relationships so that persisting the "main" object also triggers the persistence of the related sub-objects.
You can find more info on cascading here :
http://docs.jboss.org/hibernate/stable/core/reference/en/html/example-parentchild.html#example-parentchild-cascades
Ok, I made it to work
The key to it is the category mapping file:
<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<!-- Generated Dec 16, 2010 8:37:02 AM by Hibernate Tools 3.4.0.Beta1 -->
<hibernate-mapping>
<class name="com.BiddingSystem.Models.Category" table="CATEGORY">
<id name="CategoryId" type="long">
<column name="CATEGORYID" />
<generator class="native" />
</id>
<property name="CategoryName" type="java.lang.String">
<column name="CATEGORYNAME" />
</property>
<many-to-one name="ParentCategory" class="com.BiddingSystem.Models.Category">
<column name="PARENT_CATEGORY_ID" />
</many-to-one>
<set name="SubCategory" lazy="false" cascade="all-delete-orphan" inverse="true">
<key>
<column name="PARENT_CATEGORY_ID" />
</key>
<one-to-many class="com.BiddingSystem.Models.Category" />
</set>
<set name="AllAttributes" table="ATTRIBUTE" inverse="false" lazy="true">
<key>
<column name="CATEGORYID" />
</key>
<one-to-many class="com.BiddingSystem.Models.Attribute" />
</set>
</class>
</hibernate-mapping>
I am trying to make hibernate load my whole tree with no success.
I have a schema like this
A Category can have many attribute and an attribute can have many options
Category
--->Attribute1
--->AttributeOption1
--->AttributeOption3
--->Attribute2
--->AttributeOption1
--->AttributeOption1
but when I am using hibernate, it is not loading the whole tree:
my mapping file are:
Attribute Mapping FIle:
<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<!-- Generated Dec 16, 2010 5:25:09 AM by Hibernate Tools 3.4.0.Beta1 -->
<hibernate-mapping>
<class name="com.BiddingSystem.Models.Attribute" table="ATTRIBUTE">
<id name="AttributeId" type="long">
<column name="ATTRIBUTEID" />
<generator class="native" />
</id>
<property name="AttributeName" type="java.lang.String">
<column name="ATTRIBUTENAME" />
</property>
<set name="Options" table="ATTRIBUTEOPTION" inverse="false" cascade="all" lazy="true">
<key>
<column name="ATTRIBUTEID" />
</key>
<one-to-many class="com.BiddingSystem.Models.AttributeOption" />
</set>
</class>
</hibernate-mapping>
Attribute Option Mapping File:
<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<!-- Generated Dec 16, 2010 5:25:09 AM by Hibernate Tools 3.4.0.Beta1 -->
<hibernate-mapping>
<class name="com.BiddingSystem.Models.AttributeOption" table="ATTRIBUTEOPTION">
<id name="AttributeOptionId" type="long">
<column name="ATTRIBUTEOPTIONID" />
<generator class="native" />
</id>
<property name="Option" type="java.lang.String">
<column name="OPTION" />
</property>
<property name="SQLValue" type="java.lang.String">
<column name="SQLVALUE" />
</property>
</class>
</hibernate-mapping>
Category Mapping File:
<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<!-- Generated Dec 16, 2010 8:37:02 AM by Hibernate Tools 3.4.0.Beta1 -->
<hibernate-mapping>
<class name="com.BiddingSystem.Models.Category" table="CATEGORY">
<id name="CategoryId" type="long">
<column name="CATEGORYID" />
<generator class="native" />
</id>
<property name="CategoryName" type="java.lang.String">
<column name="CATEGORYNAME" />
</property>
<many-to-one name="ParentCategory" class="com.BiddingSystem.Models.Category">
<column name="PARENT_CATEGORY_ID" />
</many-to-one>
<set name="SubCategory" lazy="true" cascade="all-delete-orphan" inverse="true">
<key>
<column name="PARENT_CATEGORY_ID" />
</key>
<one-to-many class="com.BiddingSystem.Models.Category" />
</set>
<set name="AllAttributes" table="ATTRIBUTE" inverse="false" lazy="true" cascade="all">
<key>
<column name="CATEGORYID" />
</key>
<one-to-many class="com.BiddingSystem.Models.Attribute" />
</set>
</class>
</hibernate-mapping>
The function that loads the parent category are:
public List <Category> getCategory(long CategoryId)
{
Session session = gileadHibernateUtil.getSessionFactory().openSession();
List <Category> AllCategory= new LinkedList<Category> ();
String SQL="from Category where parent_category_id is NULL";
Query query = session.createQuery(SQL);
return query.list();
}
Make all your associations lazy=false; by default the lazy = true
I believe there is an other mistake:
String SQL="from Category where parent_category_id is NULL";
Query query = session.createQuery(SQL);
org.hibernate.Session.createQuery(String queryString) requires a HQL Query String, but not a SQL query! And from Category where parent_category_id is NULL seems to be a SQL query, because parent_category_id is a column name but not a property / field name.