Optimize number data types

Simple change, certain fields of entities and composite key classes did not need to be 32-bit integers and could work with smaller data types.

I looked at the MySQL database table and column structure, then changed some Java data types accordingly.

int = int (4 bytes)
smallint = short (2 bytes)
tinyint = byte (1 byte)

Author: ramonechen

src/main/java/com/carpi/carpibackend/dto/CourseDto.java

@@ -15,7 +15,7 @@ public class CourseDto {
     private String department;
 
     @Min(0)
-    private int code;
+    private short code;
 
     @NotNull
     private String title;
@@ -24,10 +24,10 @@ public class CourseDto {
     private String description;
 
     @Min(0)
-    private short creditMin;
+    private byte creditMin;
 
     @Min(0)
-    private short creditMax;
+    private byte creditMax;
 
     @NotNull
     private String[] semesterList;

src/main/java/com/carpi/carpibackend/entity/Course.java

@@ -23,7 +23,7 @@ public class Course {
     private String department;
 
     @Column(name = "code_num", nullable = false)
-    private int code;
+    private short code;
 
     @Column(name = "title", nullable = false)
     private String title;
@@ -32,8 +32,8 @@ public class Course {
     private String description;
 
     @Column(name = "credit_min", nullable = false)
-    private short creditMin;
+    private byte creditMin;
 
     @Column(name = "credit_max", nullable = false)
-    private short creditMax;
+    private byte creditMax;
 }

src/main/java/com/carpi/carpibackend/entity/CourseAttribute.java

@@ -23,7 +23,7 @@ public class CourseAttribute {
     private String department;
 
     @Column(name = "code_num", nullable = false)
-    private int code;
+    private short code;
 
     @Column(name = "attr", nullable = false)
     private String attribute;

src/main/java/com/carpi/carpibackend/entity/CourseSearchResult.java

@@ -15,13 +15,13 @@
 public class CourseSearchResult {
 
     @EmbeddedId
-    private CourseKey pkCourses;
+    private CourseKey coursePk;
 
     @Column(name = "dept", nullable = false)
     private String department;
 
     @Column(name = "code_num", nullable = false)
-    private int code;
+    private short code;
 
     @Column(name = "title", nullable = false)
     private String title;
@@ -30,10 +30,10 @@ public class CourseSearchResult {
     private String description;
 
     @Column(name = "credit_min", nullable = false)
-    private short creditMin;
+    private byte creditMin;
 
     @Column(name = "credit_max", nullable = false)
-    private short creditMax;
+    private byte creditMax;
 
     @Column(name = "sem_list", nullable = false)
     private String semesterList;

src/main/java/com/carpi/carpibackend/entity/CourseSeats.java

@@ -15,7 +15,7 @@ public class CourseSeats {
     private CourseSeatsKey courseSeatsPk;
 
     @Column(name = "sem_year", nullable = false)
-    private int semesterYear;
+    private short semesterYear;
 
     @Column(name = "semester", nullable = false)
     private String semester;
@@ -24,11 +24,11 @@ public class CourseSeats {
     private String department;
 
     @Column(name = "code_num", nullable = false)
-    private int code;
+    private short code;
 
     @Column(name = "seats_filled", nullable = false)
-    private int seatsFilled;
+    private short seatsFilled;
 
     @Column(name = "seats_total", nullable = false)
-    private int seatsTotal;
+    private short seatsTotal;
 }

src/main/java/com/carpi/carpibackend/keys/CourseAttributeKey.java

@@ -12,7 +12,7 @@ public class CourseAttributeKey implements Serializable {
     private String department;
 
     @Column(name = "code_num", insertable = false, updatable = false, nullable = false)
-    private int code;
+    private short code;
 
     @Column(name = "attr", insertable = false, updatable = false, nullable = false)
     private String attr;
@@ -33,9 +33,9 @@ public boolean equals(Object obj) {
 
     @Override
     public int hashCode() {
-        int result = department != null ? department.hashCode() : 0;
+        int result = (department != null ? department.hashCode() : 0);
         result = 31 * result + Integer.hashCode(code);
-        result = 31 * result + attr != null ? attr.hashCode() : 0;
+        result = 31 * result + (attr != null ? attr.hashCode() : 0);
         return result;
     }
 

src/main/java/com/carpi/carpibackend/keys/CourseKey.java

@@ -17,7 +17,7 @@ public class CourseKey implements Serializable {
     private String department;
 
     @Column(name = "code_num", insertable = false, updatable = false, nullable = false)
-    private int code;
+    private short code;
 
     @Override
     public boolean equals(Object obj) {
@@ -33,7 +33,7 @@ public boolean equals(Object obj) {
 
     @Override
     public int hashCode() {
-        int result = department != null ? department.hashCode() : 0;
+        int result = (department != null ? department.hashCode() : 0);
         result = 31 * result + Integer.hashCode(code);
         return result;
     }

src/main/java/com/carpi/carpibackend/keys/CourseSeatsKey.java

@@ -9,7 +9,7 @@
 public class CourseSeatsKey implements Serializable {
 
     @Column(name = "sem_year", insertable = false, updatable = false, nullable = false)
-    private int semesterYear;
+    private short semesterYear;
 
     @Column(name = "semester", insertable = false, updatable = false, nullable = false)
     private String semester;
@@ -18,7 +18,7 @@ public class CourseSeatsKey implements Serializable {
     private String department;
 
     @Column(name = "code_num", insertable = false, updatable = false, nullable = false)
-    private int code;
+    private short code;
 
     @Override
     public boolean equals(Object obj) {