JPA Entitties，如何连接表

I have three tables

我有三张桌子

CREATE TABLE "ingredient" (
  "id" INTEGER GENERATED BY DEFAULT AS IDENTITY(START WITH 1, INCREMENT BY 1) PRIMARY KEY,
  "ingredient" VARCHAR(50) NOT NULL
);


CREATE TABLE "pizza" (
  "id" INTEGER GENERATED BY DEFAULT AS IDENTITY(START WITH 1, INCREMENT BY 1) PRIMARY KEY,
  "pizza" VARCHAR(50) NOT NULL
);


CREATE TABLE "pizza_structure" (
  "pizza_id" INT NOT NULL,
  "ingredient_id" INT NOT NULL,
  "amount" INT NOT NULL
);
CREATE TABLE "in