return ((Double) a.doubleValue()).compareTo(b.doubleValue());
    }

    @Override
    public int hashCode() {
      return NumberOrdering.class.hashCode();
    }

    @Override
    public boolean equals(@Nullable Object other) {
      return other instanceof NumberOrdering;
    }

    private static final long serialVersionUID = 0;
  }

  /*

        this.a = a;
        this.b = b;
      }

      @Override
      public int compareTo(TypeWithDuplicates o) {
        return Integer.compare(a, o.a);
      }

      public boolean fullEquals(@Nullable TypeWithDuplicates other) {
        return other != null && a == other.a && b == other.b;
      }
    }

    Collector<TypeWithDuplicates, ?, ImmutableSortedSet<TypeWithDuplicates>> collector =

      return ((Double) a.doubleValue()).compareTo(b.doubleValue());
    }

    @Override
    public int hashCode() {
      return NumberOrdering.class.hashCode();
    }

    @Override
    public boolean equals(@Nullable Object other) {
      return other instanceof NumberOrdering;
    }

    private static final long serialVersionUID = 0;
  }

  /*

	lc := Lifecycle{
		Rules: []Rule{
			{
				ID:     "ExpiredObjectDeleteAllVersions-20",
				Status: "Enabled",
				Expiration: Expiration{
					set:       true,
					DeleteAll: Boolean{val: true, set: true},
					Days:      20,
				},
			},
			{
				ID:     "Transition-10",
				Status: "Enabled",
				Transition: Transition{
					set:          true,

	}
}

// symRefAttrs parses an optional function symbol attribute clause for
// the function symbol 'name', logging an error for a malformed
// attribute clause if 'issueError' is true. The return value is a
// (boolean, ABI) pair indicating that the named symbol is either
// static or a particular ABI specification.
//
// The expected form of the attribute clause is:
//
// empty,           yielding (false, obj.ABI0)

这个`__tablename__`属性是用来告诉 SQLAlchemy 要在数据库中为每个模型使用的数据库表的名称。

### 创建模型属性/列

现在创建所有模型（类）的属性。

这些属性中的每一个都代表其相应数据库表中的一列。

我们使用`Column`来表示 SQLAlchemy 中的默认值。

我们传递一个 SQLAlchemy “类型”，如`Integer`、`String`和`Boolean`，它定义了数据库中的类型，作为参数。

```Python hl_lines="1  10-13  21-24"
{!../../docs_src/sql_databases/sql_app/models.py!}
```

### 创建关系

现在创建关系。

为此，我们使用SQLAlchemy  ORM提供的`relationship`。

		IsOwner:         false,
	})

	encodedSuccessResponse := encodeResponse(PolicyStatus{
		IsPublic: func() string {
			// Silly to have special 'boolean' values yes
			// but complying with silly implementation
			// https://docs.aws.amazon.com/AmazonS3/latest/API/API_GetBucketPolicyStatus.html
			if readable && writable {
				return "TRUE"
			}

		HTTPStatusCode: http.StatusBadRequest,
	},
	ErrInvalidLifecycleQueryParameter: {
		Code:           "XMinioInvalidLifecycleParameter",
		Description:    "The boolean value provided for withUpdatedAt query parameter was invalid.",
		HTTPStatusCode: http.StatusBadRequest,
	},
	ErrAdminNoSuchUser: {
		Code:           "XMinioAdminNoSuchUser",

#### kubectl:

        .setDefault(TypeParameter.class, new TypeParameter<T>() {})
        .testAllPublicInstanceMethods(TypeToken.of(String.class));
  }

  private static class Assignability<From, To> {

    boolean isAssignable() {
      return new TypeToken<To>(getClass()) {}.isSupertypeOf(new TypeToken<From>(getClass()) {});
    }

    static <From, To> Assignability<From, To> of() {
      return new Assignability<>();