commit

Author: ravening

hibernate/ifinances/src/main/java/com/rakeshv/ifinances/models/Account.java

@@ -11,13 +11,16 @@
 import javax.persistence.Entity;
 import javax.persistence.EnumType;
 import javax.persistence.Enumerated;
+import javax.persistence.FetchType;
 import javax.persistence.GeneratedValue;
 import javax.persistence.GenerationType;
 import javax.persistence.Id;
 import javax.persistence.JoinColumn;
 import javax.persistence.JoinTable;
 import javax.persistence.ManyToMany;
 import javax.persistence.ManyToOne;
+import javax.persistence.NamedQueries;
+import javax.persistence.NamedQuery;
 import javax.persistence.OneToMany;
 import javax.persistence.SequenceGenerator;
 import javax.persistence.Table;
@@ -35,6 +38,10 @@
 @Builder
 @Entity
 @Table(name = "account")
+@NamedQueries({
+        @NamedQuery(name = "Account.largeDeposits", query = "select distinct t.account from Transaction t " +
+            "where t.amount > 500 and lower(t.transactionType) = 'deposit' ")
+})
 public class Account {
     @Id
     // AUTO is the default generation strategy
@@ -54,7 +61,7 @@ public class Account {
             inverseJoinColumns=@JoinColumn(name="USER_ID"))
     private Set<User> users = new HashSet<>();
 
-    @ManyToOne
+    @ManyToOne(fetch = FetchType.LAZY)
     @JoinColumn(name="BANK_ID")
     private Bank bank;
 

hibernate/ifinances/src/main/java/com/rakeshv/ifinances/models/UserCredentialView.java

@@ -0,0 +1,35 @@
+package com.rakeshv.ifinances.models;
+
+import lombok.AllArgsConstructor;
+import lombok.Builder;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+import javax.persistence.Column;
+import javax.persistence.Entity;
+import javax.persistence.Id;
+import javax.persistence.Table;
+
+@Data
+@AllArgsConstructor
+@NoArgsConstructor
+@Builder
+@Entity
+@Table(name = "v_user_credentials")
+public class UserCredentialView {
+    @Id
+    @Column(name = "USER_ID")
+    private Long userId;
+
+    @Column(name = "FIRST_NAME")
+    private String firstName;
+
+    @Column(name = "LAST_NAME")
+    private String lastName;
+
+    @Column(name = "USERNAME")
+    private String userName;
+
+    @Column(name = "PASSWORD")
+    private String password;
+}

hibernate/notes.txt

@@ -131,7 +131,7 @@ more joins are needed. may lead to bad performance
 In our example, ticket_number, origin, price, destination are duplicated in both tables of subclass
 The deeper the hierarchy, the more deeper the joins needed
 
-3. table per concrete entity. no table for super class.
+3. TABLE_PER_CLASS : table per concrete entity. no table for super class.
 subclass has separate table
 all properties of root class are mapped to columns of each subclass
 poor support for polymorphism
@@ -148,10 +148,19 @@ use AttributeConverter between state to db column
 
 Entity lifecycle
 
+
+Transient
+Persistent
+Removed
+Detached
+
+
 entitymanager is an interface to interact with persistence context
 Entity states
 new, managed, removed, detached, transient
 
+Transient - object created with new operator but is not yet associated with db row
+
 persist(), remove(), merge(), find(), lock(), detach(), refresh()
 when entity is loaded from db then they are in Managed state