Partial object read ant one-to-many relationship

Hi,
does Toplink support partial object reading for one-to-many links?

Not really, but it might work in 10.1.3 or 11g preview. You can use joining (join fetch) on 1-m (10.1.3) and m-m (11g).
In 11g you can use fetch groups that do support 1-m and m-m, and also let you join fetch or batch the relationship. You need to use weaving to use fetch groups.

Similar Messages

  • Urgent : java bean having bidirectional one to many relationship

    Hi,
    We have complex requirement in our application.
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    E.g
    Class Basket1 {
    public String color;
    pubic String type;
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    Class Basket2 {
    public String color;
    pubic String type;
    public List<Basket2> basketList = new ArrayList()
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    I can't see anything bidirectional about these relationships. What I can see is a couple of BasketN classes that look identical so I don't know why they both exist, and they both contain lists of themselves as members, which suggests some kind of tree structure. Nothing bidirectional there. I can see tat these things can form circular object graphs but I don't see why you would want to do that.
    We need to exact copy Basket1 to Basket2And I don't know what that means. Please explain.

  • JPA, how to write a service to persist objects in a 1-to-many relationship

    i am using JPA for data persistence. i have two objects that are involved in a one-to-many relationship. for example, i have an object, Company, and Company can have one or more, Employee. i then define a service called, CompanyDao, which has the usual create-read-update-delete (CRUD) operations. my problem is that when i instantiate a new Company with new Employees and call CompanyDao.create(Company), i keep getting an exception.
    Cannot add or update a child row: a foreign key constraint fails (`demo`.`employee`, CONSTRAINT `employee_ibfk_1` FOREIGN KEY (`companyId`) REFERENCES `company` (`id`))
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    Hi,
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    Regards
    Murali N

  • Newbie: one to many relationship SQL error

    Greetings all-
    This is probably a slam dunk for you JDO experts. I'm a JDO newbie, working
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    name : varchar(64)
    division : varchar(64)
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    company_id: int(11) -- foreign key to table company
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    product_description: varchar(64)
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    private int companyID;
    private String company_name;
    private String division;
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    private ArrayList companyProducts;
    // .. methods omitted
    public class CompanyProduct {
    private int companyID;
    private String productName;
    private String productDesc;
    // Methods omitted
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    <jdo>
    <package name="com.packexpo.db">
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    <extension vendor-name="tt" key="pk-column" value="company_id"/>
    <extension vendor-name="tt" key="lock-column" value="none"/>
    <extension vendor-name="tt" key="class-column" value="none"/>
    <field name="companyID">
    <extension vendor-name="tt" key="data-column" value="company_id"/>
    </field>
    <field name="name">
    <extension vendor-name="tt" key="data-column" value="name"/>
    <extension vendor-name="tt" key="column-length" value="64"/>
    </field>
    <field name="division">
    <extension vendor-name="tt" key="data-column" value="division"/>
    <extension vendor-name="tt" key="column-length" value="64"/>
    </field>
    <field name="companyProducts">
    <collection element-type="com.packexpo.db.CompanyProduct"/>
    <extension vendor-name="tt" key="inverse" value="companyID"/>
    </field>
    </class>
    <class name="CompanyProduct">
    <extension vendor-name="tt" key="table" value="company_product"/>
    <extension vendor-name="tt" key="pk-column" value="company_id"/>
    <extension vendor-name="tt" key="lock-column" value="none"/>
    <extension vendor-name="tt" key="class-column" value="none"/>
    <field name="companyID">
    <extension vendor-name="tt" key="data-column" value="company_id"/>
    </field>
    <field name="productName">
    <extension vendor-name="tt" key="data-column" value="product_name"/>
    <extension vendor-name="tt" key="column-length" value="64"/>
    </field>
    <field name="productDesc">
    <extension vendor-name="tt" key="data-column"
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    <extension vendor-name="tt" key="column-length" value="64"/>
    </field>
    </class>
    </package>
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    javax.jdo.JDODataStoreException: [SQL=SELECT company.COMPANYPRODUCTSX FROM
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    E0610 Error in executeQuery()
    E0606 executeQuery() error --
    E0701 Error in getResult().
    E0708 Command results in error - 1054 Unknown column
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    NestedThrowables:
    com.solarmetric.kodo.impl.jdbc.sql.SQLExceptionWrapper: [SQL=SELECT
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    E0610 Error in executeQuery()
    E0606 executeQuery() error --
    E0701 Error in getResult().
    E0708 Command results in error - 1054 Unknown column
    'company.COMPANYPRODUCTSX' in 'field list'
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    loss for what I did wrong.
    Any suggestions?
    Thanks!
    -Mike

    Hi,
    915766 wrote:
    I need to write sql for below requirement:
    table structure is
    serial no LPN
    1 4
    2 4
    3 6
    4 6
    5 6
    6 3
    7 3
    8 3
    9 1
    I have to pick distinct 'LPN' like below:That sounds like a job for "GROUP BY lpn".
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    results needs to be as below:
    serial no LPN
    1 4
    3 6
    6 3
    9 1
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    ,         lpn
    FROM      table_x
    GROUP BY  lpn
    ORDER BY  lpn     -- if wanted
    I hope this answers your question.
    If not, post a little sample data (CREATE TABLE and INSERT statements, relevant columns only), and also post the results you want from that data.
    Explain, using specific examples, how you get those results from that data.
    Always say which version of Oracle you're using (e.g., 11.2.0.2.0).
    See the forum FAQ {message:id=9360002}

  • Toplink one to many relationship

    I am working on DAO layer for One to many relationship
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    Hi,
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  • One-to-many relationships problem

    Hi,
    I'm having some problems with one-to-many relationships.
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  • One to many relationships in EJB

    I have two EBs related by a one to many relationship. The first of these tables is called Student and has studentId as its key. The second of the tables has a composite key made up of studentID, courseID and semesterID.
    However, when the tables are generated in NetBeans 5.5, I find that the Course table has studentID as both a primary key and a foreign key.
    I am at a loss to understand this as I am new to NetBeans and EJB.
    Can anyone advise?
    Thanks
    Martin O'Shea.
    The Student class:
    package CBSD_CW;
    import java.io.Serializable;
    import javax.persistence.*;
    import java.util.*;
    import javax.persistence.CascadeType;
    import javax.persistence.Column;
    import javax.persistence.Entity;
    import javax.persistence.Id;
    @Entity
    public class Student_EB implements Serializable {
        // Table columns.
        @Id
        @Column(name = "STUDENT_ID", nullable = false)
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        @Column(name = "FIRST_NAME", length = 50, nullable = true)
        private String firstName; // First Name. Entity <Student><FirstName> from file: SampleData.xml.
        @Column(name = "LAST_NAME", length = 50, nullable = true)
        private String lastName; // Last Name. Entity <Student><LastName> from file: SampleData.xml.
        @Column(name = "STUDENT_LEVEL", length = 2, nullable = true)
        private String studentLevel; // Student Level. Entity <Student><Level> from file: SampleData.xml.
        @Column(name = "PROGRAM_NAME", length = 50, nullable = true)
        private String programName; // Program Name. Entity <Student><ProgramName> from file: SampleData.xml.
        @Column(name = "PROGRAM_NUMBER", length = 3, nullable = true)
        private String programNumber; // Program Number. Entity <Student><ProgramNumber> from file: SampleData.xml.
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        @OneToMany(cascade=CascadeType.ALL, mappedBy="student")
        private List<Course_EB> courses;
        public List<Course_EB> getCourses() {
           return courses;
        public void setCourses(List<Course_EB> courses) {
           this.courses = courses;
        // Accessors and mutators.
        public Long getId() {
            return this.studentId;
        public void setId(Long studentId) {
            this.studentId = studentId;
        public String getFirstName() {
            return firstName;
        public void setFirstName(String firstName) {
            this.firstName = firstName;
        public String getLastName() {
            return lastName;
        public void setLastName(String lastName) {
            this.lastName = lastName;
        public String getStudentLevel() {
            return studentLevel;
        public void setStudentLevel(String studentLevel) {
            this.studentLevel = studentLevel;
        public String getProgramName() {
            return programName;
        public void setProgramName(String programName) {
            this.programName = programName;
        public String getProgramNumber() {
            return programNumber;
        public void setProgramNumber(String programNumber) {
            this.programNumber = programNumber;
        // Other methods.
        public boolean equals(Object obj) {
           if (obj == this) {
               return (true);
           if (!(obj instanceof Student_EB)) {
               return (false);
           if (obj == null) {
               return (false);
           Student_EB student = (Student_EB) obj;
           return (student.studentId == studentId);
    The Course class:
    package CBSD_CW;
    import javax.persistence.CascadeType;
    import javax.persistence.EmbeddedId;
    import javax.persistence.Entity;
    import javax.persistence.JoinColumn;
    import javax.persistence.JoinTable;
    import javax.persistence.ManyToOne;
    @Entity
    public class Course_EB implements java.io.Serializable {
       Course_PK course;
       // M:1 relationship with Student_EB.
       private Student_EB student;
       @ManyToOne(cascade=CascadeType.ALL)
       @JoinTable(name = "Student_EB", joinColumns= @JoinColumn(name = "STUDENT_ID", referencedColumnName = "studentId"))
       public Student_EB getStudent() {
          return (student);
       public void setStudent(Student_EB student) {
          this.student = student;
       // Constructor.
       public Course_EB() {
       // Accessors and mutators.
       @EmbeddedId
       public Course_PK  getCourse_PK () {
          return (course);
       public void setCourse_PK(Course_PK course) {
          this.course = course;
    The Course_PK class:
    package CBSD_CW;
    import javax.persistence.Column;
    import javax.persistence.Embeddable;
    @Embeddable
    public class Course_PK implements java.io.Serializable {
       // Table columns.
       @Column(name = "STUDENT_ID", length = 4, nullable = false)
       private long studentId; // Student ID. Entity <Student><ID> from file: SampleData.xml.
       @Column(name = "COURSE_ID", length = 4, nullable = false) 
       private String courseId; // Course ID. Entity <Student><Course><Number> from file: SampleData.xml.
       @Column(name = "SEMESTER_CODE", length = 3, nullable = false)
       private String semesterCode; // Semester Code. Entity <Student><Course><SemesterCode> from file: SampleData.xml.
       @Column(name = "GRADE", nullable = true)
       private char grade; // Grade. Entity <Student><Course><Grade> from file: SampleData.xml.
       // Constructors.
       public Course_PK() {
       public Course_PK(long studentId, long courseid, String semesterCode) {
          this.studentId = studentId;
          this.courseId = courseId;
          this.semesterCode = semesterCode;
       // Accessors and mutators.
       public long getStudentId() {
          return (studentId);
       public void setStudentId(long studentId) {
          this.studentId = studentId;
       public String getCourseId() {
           return (courseId);
       public void setId(String courseId) {
           this.courseId = courseId;
       public String getSemesterCode() {
           return (semesterCode);
       public void setSemesterCode(String semesterCode) {
           this.semesterCode = semesterCode;
       public char getGrade() {
           return (grade);
       public void setGrade(char grade) {
           this.grade = grade;
       // Other methods.
       public boolean equals(Object obj) {
           if (obj == this) {
               return (true);
           if (!(obj instanceof Course_PK)) {
               return (false);
           if (obj == null) {
               return (false);
           Course_PK course = (Course_PK) obj;
           return ((course.studentId == studentId) &&
                   (course.courseId.equals(courseId)) &&
                   (course.semesterCode.equals(semesterCode)) &&
                   (course.grade == grade));
    }

    Because you have field
    @Column(name = "STUDENT_ID", length = 4, nullable = false)
       private long studentId; // Student ID. Entity <Student><ID> from file: SampleData.xml.In you Course_PK class. As a primary keys.
    An again you are joining it in field
        @ManyToOne(cascade=CascadeType.ALL)
       @JoinTable(name = "Student_EB", joinColumns= @JoinColumn(name = "STUDENT_ID", referencedColumnName = "studentId"))So it is appearing both inPrimary Key and in Foreign Key.

  • JPA one to many relationship and serialization

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  • How do I create a One to many relationship page in Dreamweaver?

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