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POUnable to persist entity (unidirectional many to one relationship)
 

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  1. POUnable to persist entity (unidirectional many to one relationship)
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    <p>I have a situation where i have an entity <code>OrderedItem</code> which have a many-to-one relationship with another entity <code>Order</code>. When I try to persist the <code>Order</code> entity I receive the following error:</p> <pre><code>&gt; The bean encountered a non-application exception; nested exception is: &gt; javax.persistence.PersistenceException: Exception [EclipseLink-4002] &gt; (Eclipse Persistence Services - 2.5.0.v20130507-3faac2b): &gt; org.eclipse.persistence.exceptions.DatabaseException Internal &gt; Exception: com.sap.db.jdbc.exceptions.JDBCDriverException: SAP DBTech &gt; JDBC: [257]: sql syntax error: incorrect syntax near "ORDER": line 1 &gt; col 13 (at pos 13) Error Code: 257 Call: INSERT INTO ORDER (ID, &gt; ORDEREDAT, STATUS, TABLE, acceptor_id, waiter_id) VALUES (?, ?, ?, ?, &gt; ?, ?) bind =&gt; [6 parameters bound] Query: &gt; InsertObjectQuery([Timestamp: 2013-07-16 19:17:56.708 Table: 365 &gt; Status: NEW Waiter: [ID: 1 EGN: 9999999999 Name: Kukata Role: [Role: &gt; Manager]] Acceptor: [ID: 1 EGN: 9999999999 Name: Kukata Role: [Role: &gt; Manager]]]) </code></pre> <p>Here is my Order entity</p> <pre><code>@Entity public class Order implements Serializable { private static final long serialVersionUID = 1L; public static enum Status{ NEW, PROCESSED } @Id @GeneratedValue(strategy = GenerationType.TABLE) private long id; @NotNull @Column(nullable = false) private Timestamp orderedAt; @NotNull @Column(nullable = false) private Integer table; @NotNull @ManyToOne(optional = false) @JoinColumn(name = "waiter_id", referencedColumnName = "id") private Employee waiter; @NotNull @Enumerated(EnumType.STRING) private Status status; @ManyToOne(optional = true) @JoinColumn(name = "acceptor_id", referencedColumnName = "id") private Employee acceptor; public long getId() { return id; } public void setId(long id) { this.id = id; } public Timestamp getOrderedAt() { return orderedAt; } public void setOrderedAt(Timestamp param) { this.orderedAt = param; } public Integer getTable() { return table; } public void setTable(Integer param) { this.table = param; } public Employee getWaiter() { return waiter; } public void setWaiter(Employee param) { this.waiter = param; } public Status getStatus() { return status; } public void setStatus(Status param) { this.status = param; } public Employee getAcceptor() { return acceptor; } public void setAcceptor(Employee param) { this.acceptor = param; } @Override public String toString() { return new StringBuilder().append("[Timestamp: ").append(orderedAt) .append("\tTable: ").append(table).append("\tStatus: ") .append(status).append("\tWaiter: ").append(waiter) .append("\tAcceptor: ").append(acceptor).append("]").toString(); } } </code></pre> <p>And here is my orderedItem entity</p> <pre><code>@Entity @Table(name = "OrderedItem") public class OrderedItem implements Serializable { private static final long serialVersionUID = 1L; public OrderedItem() { } @Id @GeneratedValue(strategy = GenerationType.TABLE) private long id; @NotNull @Column(nullable = false) private Integer quantity; @NotNull @Column(nullable = false) private Double price; @NotNull @OneToOne(optional = false) @JoinColumn(name = "item_id", referencedColumnName = "id") private Item item; @NotNull @ManyToOne(optional = false) @JoinColumn(name = "order_id", referencedColumnName = "id") private Order order; public long getId() { return id; } public void setId(long id) { this.id = id; } public Integer getQuantity() { return quantity; } public void setQuantity(Integer param) { this.quantity = param; } public Double getPrice() { return price; } public void setPrice(Double param) { this.price = param; } public Item getItem() { return item; } public void setItem(Item param) { this.item = param; } public Order getOrder() { return order; } public void setOrder(Order param) { this.order = param; } @Override public String toString() { return new StringBuilder().append("[Order: ").append(order) .append("Item: ").append(item).append("\tQuantity: ") .append(quantity).append("\tPrice: ").append(price).append("]") .toString(); } } </code></pre> <p>And my Employee entity</p> <pre><code>@Entity @Table(name = "Employee") public class Employee implements Serializable { private static final long serialVersionUID = 1L; public Employee() { } @Id @GeneratedValue(strategy = GenerationType.TABLE) private long id; @NotNull @Column(nullable = false) private String name; @NotNull @Column(nullable = false, unique = true) private String egn; @NotNull @Column(nullable = false) private byte[] pwd; @NotNull @ManyToOne(optional = false) @JoinColumn(name = "Role_role", referencedColumnName = "role") private Role role; public long getId() { return id; } public void setId(long id) { this.id = id; } public String getName() { return name; } public void setName(String param) { this.name = param; } public String getEGN() { return egn; } public void setEGN(String param) { this.egn = param; } public byte[] getPwd() { return pwd; } public void setPwd(byte[] param) { this.pwd = param; } public Role getRole() { return role; } public void setRole(Role param) { this.role = param; } @Override public String toString() { return new StringBuilder().append("[ID: ").append(id).append("\tEGN: ") .append(egn).append("\tName: ").append(name).append("\tRole: ") .append(role).append("]").toString(); } } </code></pre> <p>Everything works fine, until I try to persist the order entity. Here is a dummy test servlet</p> <pre><code>import java.io.IOException; import java.sql.Timestamp; import java.util.List; import javax.ejb.EJB; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.persistence.dao.CategoryDAO; import org.persistence.dao.EmployeeDAO; import org.persistence.dao.ItemDAO; import org.persistence.dao.OrderDAO; import org.persistence.dao.OrderedItemDAO; import org.persistence.dao.RoleDAO; import sbms.persistence.entities.Category; import sbms.persistence.entities.Employee; import sbms.persistence.entities.Item; import sbms.persistence.entities.Order; import sbms.persistence.entities.OrderedItem; import sbms.persistence.entities.Role; public class Test extends HttpServlet { private static final long serialVersionUID = 1L; @EJB private CategoryDAO categoryDAO; @EJB private OrderDAO orderDAO; @EJB private OrderedItemDAO orderedItemDAO; @EJB private ItemDAO itemDAO; @EJB private RoleDAO roleDAO; @EJB private EmployeeDAO employeeDAO; public Test() { super(); // TODO Auto-generated constructor stub } protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { try { response.getWriter().print( "&lt;p&gt;Checking if the Role 'Manager' exists.&lt;/p&gt;"); Role managerRole = null; List&lt;Role&gt; roles = roleDAO.getAll( "select X from Role X where X.role = ?1", Role.ERoles.Manager); if (roles.size() == 0) { response.getWriter().print( "&lt;p&gt;The role 'manager' does not exist. Adding it.&lt;/p&gt;"); Role role = new Role(); role.setRole(Role.ERoles.Manager); roleDAO.add(role); managerRole = role; } else { response.getWriter().print( "&lt;p&gt;The role 'manager' does exists.&lt;/p&gt;"); managerRole = roles.get(0); } response.getWriter().print( "&lt;p&gt;Checking if there are any managers&lt;/p&gt;"); List&lt;Employee&gt; employes = employeeDAO.getAll( "select X from Employee X where X.role = ?1", managerRole); if (employes.size() == 0) { response.getWriter().print( "&lt;p&gt;There are no managers. Adding new one.&lt;/p&gt;"); Employee employee = new Employee(); employee.setEGN("9999999999"); employee.setName("Kukata"); employee.setPwd("password".getBytes()); employee.setRole(managerRole); employeeDAO.add(employee); } response.getWriter().print("&lt;p&gt;Checking for category 'Vodka'&lt;/p&gt;"); Category category = null; List&lt;Category&gt; categories = categoryDAO.getAll( "select X from Category X where X.name = ?1", "Vodka"); if (categories.size() == 0) { category = new Category(); response.getWriter().print("&lt;p&gt;Adding category Vodka&lt;/p&gt;"); category.setName("Vodka"); categoryDAO.add(category); }else{ category = categories.get(0); } response.getWriter().print("&lt;p&gt;Checking for Russian Standard :D&lt;/p&gt;"); Item item = null; List&lt;Item&gt; items = itemDAO.getAll("select X from Item X where X.name = ?1", "RussianStandard"); if(items.size() == 0){ response.getWriter().print( "&lt;p&gt;Adding item vodka Russian Standard&lt;/p&gt;"); item = new Item(); item.setCategory(category); item.setPrice(35.6); item.setName("RussianStandard"); itemDAO.add(item); }else{ item = items.get(0); } response.getWriter().print("&lt;p&gt;Making an order&lt;/p&gt;"); // Get the employee who accepted the order (in this example - // Kukata) List&lt;Employee&gt; acceptor = employeeDAO.getAll( "select X from Employee X where X.egn = ?1", "9999999999"); if (acceptor.size() == 0) { response.getWriter().print( "&lt;p&gt;Error -there is no such employee&lt;/p&gt;"); return; } Order order = new Order(); order.setStatus(Order.Status.NEW); order.setOrderedAt(new Timestamp(System.currentTimeMillis())); order.setTable(365); // Kuakata accepted and processed the order! order.setWaiter(acceptor.get(0)); order.setAcceptor(acceptor.get(0)); response.getWriter().print("&lt;p&gt;Persisting the order&lt;/p&gt;"); orderDAO.add(order); response.getWriter().print("&lt;p&gt;Adding the ordered items&lt;/p&gt;"); OrderedItem orderedItem = new OrderedItem(); // We set the previously created item(vodka), but we can also get it // from the db orderedItem.setItem(item); orderedItem.setOrder(order); orderedItem.setPrice(item.getPrice()); orderedItem.setQuantity(5); orderedItemDAO.add(orderedItem); response.getWriter().print("&lt;p&gt;Lets see what we have done:&lt;/p&gt;"); } catch (Exception e) { response.getWriter().print(e.getMessage()); } } protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // TODO Auto-generated method stub } } </code></pre>
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    1. PTQuestion
    1. USCycDemo
    1. USSvetlin Zarev
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    1. VO
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      1. POUnable to persist entity (unidirectional many to one relationship)
      1. This table or related slice is empty.
      1. VTApproveEditSuggestion
    1. CO`ORDER` is a reserved keyword in [hana](http://help.sap.com/hana/html/_bsql_introduction.html).
      singulars
      1. POUnable to persist entity (unidirectional many to one relationship)
      1. USSotirios Delimanolis
    2. COThank You!!! you saved my day (night)
      singulars
      1. POUnable to persist entity (unidirectional many to one relationship)
      1. USSvetlin Zarev
    3. COYou're welcome. Good luck!
      singulars
      1. POUnable to persist entity (unidirectional many to one relationship)
      1. USSotirios Delimanolis
 

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