数据库重构

src/main/java/com/example/springdemo/entities/Dishes.java

@@ -0,0 +1,33 @@
+package com.example.springdemo.entities;
+
+import jakarta.persistence.*;
+import lombok.AllArgsConstructor;
+import lombok.Builder;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+import java.math.BigDecimal;
+
+@Data
+@Builder
+@NoArgsConstructor
+@AllArgsConstructor
+@Entity
+@Table(name = "Dishes")
+//菜单菜品类
+public class Dishes {
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    private Integer id;//主键，菜品ID
+    private String name;//菜品名称
+    private BigDecimal price;//菜品价格
+    private Integer discount;//菜品折扣
+    @Column(name = "finalPrice")
+    private BigDecimal finalPrice;//菜品最终价格
+    private String description;//菜品描述
+
+    @ManyToOne(cascade = CascadeType.ALL, fetch = FetchType.LAZY)
+    @JoinColumn(name = "merchantsID", referencedColumnName = "id")
+    @Column(name = "merchantsID")
+    private Merchants merchants;//商家
+}

src/main/java/com/example/springdemo/entities/Indent.java

@@ -1,31 +0,0 @@
-package com.example.springdemo.entities;
-
-import jakarta.persistence.*;
-import lombok.AllArgsConstructor;
-import lombok.Builder;
-import lombok.Data;
-import lombok.NoArgsConstructor;
-import org.springframework.data.annotation.CreatedDate;
-
-import java.util.Date;
-
-//订单类
-@Data
-@Builder
-@NoArgsConstructor
-@AllArgsConstructor
-@Entity
-@Table(name = "Indent")
-public class Indent {
-    @Id
-    @GeneratedValue(strategy = GenerationType.IDENTITY)
-    private Long id;//订单ID
-    private Float allPrice;//菜品总价
-    @CreatedDate
-    private Date createdDate;//订单创建时间
-    private String message;//下单备注
-    @OneToOne
-    private Users userID;//外键，下单用户ID
-    @OneToOne
-    private Merchants merchantsID;//外键，餐厅ID
-}

src/main/java/com/example/springdemo/entities/IndentItem.java

@@ -1,28 +0,0 @@
-package com.example.springdemo.entities;
-
-import jakarta.persistence.*;
-import lombok.AllArgsConstructor;
-import lombok.Builder;
-import lombok.Data;
-import lombok.NoArgsConstructor;
-
-//订单中的菜品
-@Data
-@Builder
-@NoArgsConstructor
-@AllArgsConstructor
-@Entity
-public class IndentItem {
-    @Id
-    @GeneratedValue(strategy = GenerationType.IDENTITY)
-    private Long id;//主键，菜品ID
-    private String name;//菜品名字
-    @Column(name = "initialPrice")
-    private Float initialPrice;//菜品原价
-    private Float discount;//折扣
-    @Column(name = "finalPrice")
-    private Float finalPrice;//最终价格
-    private String description;//菜品描述
-    @OneToOne
-    private Indent indentID;//外键，订单ID
-}

src/main/java/com/example/springdemo/entities/Merchants.java

@@ -3,6 +3,8 @@ package com.example.springdemo.entities;
 import jakarta.persistence.*;
 import lombok.*;
 
+import java.util.List;
+
 @Data
 @Builder
 @NoArgsConstructor
@@ -12,11 +14,15 @@ import lombok.*;
 public class Merchants {
     @Id
     @GeneratedValue(strategy = GenerationType.IDENTITY)
-    private Long id;//主键,商家编号
+    private Integer id;//主键,商家编号
     private String name;//店铺名字
     private String address;//店铺地址
-    private String description;//店铺描述
     @Column(name = "phoneNumber")
     private String phoneNumber;//商家联系方式
+    private String description;//店铺描述
 
+    //商家和菜品是一对多的关系，有mappedBy的时候，表示Merchants的dishes 字段放弃维护权，而将维护权交给了Dishes的关联属性merchants
+    @OneToMany(cascade = CascadeType.ALL, fetch = FetchType.LAZY, mappedBy = "merchants")
+    @Column(name = "dishesID")
+    private List<Dishes> dishes;//菜品
 }

src/main/java/com/example/springdemo/entities/OrderDishes.java

@@ -0,0 +1,33 @@
+package com.example.springdemo.entities;
+
+import jakarta.persistence.*;
+import lombok.AllArgsConstructor;
+import lombok.Builder;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+//订单中的菜品
+@Data
+@Builder
+@NoArgsConstructor
+@AllArgsConstructor
+@Entity
+@Table(name = "OrderDishes")
+public class OrderDishes {
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    private Integer id;//主键ID
+
+    @OneToOne(cascade = CascadeType.ALL)
+    @JoinColumn(name = "dishesID", referencedColumnName = "id")
+    @Column(name = "dishesID")
+    private Dishes dishes;//菜品ID
+
+    @OneToOne(cascade = CascadeType.ALL)
+    @JoinColumn(name = "merchantsID", referencedColumnName = "id")
+    private Merchants merchants;//商家ID
+
+    @ManyToOne(cascade = CascadeType.ALL)
+    @JoinColumn(name = "ordersID", referencedColumnName = "id")
+    private Orders orders;//订单ID
+}

src/main/java/com/example/springdemo/entities/Orders.java

@@ -0,0 +1,43 @@
+package com.example.springdemo.entities;
+
+import jakarta.persistence.*;
+import lombok.AllArgsConstructor;
+import lombok.Builder;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+import org.springframework.data.annotation.CreatedDate;
+
+import java.math.BigDecimal;
+import java.util.Date;
+import java.util.List;
+
+//订单类
+@Data
+@Builder
+@NoArgsConstructor
+@AllArgsConstructor
+@Entity
+@Table(name = "Orders")
+public class Orders {
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    private Integer id;//订单ID
+
+    @OneToMany(cascade = CascadeType.ALL, mappedBy = "orders")
+    @Column(name = "orderDishesID")
+    private List<OrderDishes> orderDishes;//订单中的菜品
+
+    @ManyToOne(cascade = CascadeType.ALL, fetch = FetchType.LAZY)
+    @JoinColumn(name = "usersID", referencedColumnName = "id")
+    @Column(name = "usersID")
+    private Users user;//外键，下单用户
+
+    @Column(name = "allPrice")
+    private BigDecimal allPrice;//订单总价
+
+    private String message;//下单备注
+
+    @CreatedDate
+    @Column(name = "createDate")
+    private Date createdDate;//订单创建时间
+}

src/main/java/com/example/springdemo/entities/Users.java

@@ -6,6 +6,8 @@ import lombok.Builder;
 import lombok.Data;
 import lombok.NoArgsConstructor;
 
+import java.util.List;
+
 //用户类
 @Data
 @Builder
@@ -16,10 +18,14 @@ import lombok.NoArgsConstructor;
 public class Users {
     @Id
     @GeneratedValue(strategy = GenerationType.IDENTITY)
-    private Long id;//主键，用户ID
+    private Integer id;//主键，用户ID
     private String name;//用户姓名
+    private String sex;//用户性别
     @Column(name = "phoneNumber")
     private String phoneNumber;//用户联系方式
     private String address;//家庭住址
-    private String password;//用户密码
+
+    @OneToMany(cascade = CascadeType.ALL, mappedBy = "user")
+    @Column(name = "ordersID")
+    private List<Orders> orders;//订单
 }