JSON 类型 JSON 类型 JSON 类型可以存储 JSON 这种半结构化的数据，相比于直接将 JSON 存储为字符串，它的好处在于： 使用 Binary 格式进行序列化，对 JSON 的内部字段的查询、解析加快； 多了 JSON 合法性验证的步骤，只有合法的 JSON 文档才可以放入这个字段中； JSON 字段本身上，并不能创建索引。相反...

Type anonymity See also: Type anonymity Closures succinctly capture variables from enclosing scopes. Does this haveany consequences? It surely does. Observe how using a closur...

Type Guard typeof instanceof in Literal Type Guard User Defined Type Guards Type Guard User Defined Type Guards Type Guard Type Guards allow you to narrow down the typ...

categories: [Types] Using the Option type Option equality Option representation Options are not just for primitive types How the Option type should not be used The Option mod...

Using schemas to enhance the Rego type checker Passing a single file with -s Passing a directory with -s Usage scenario with a single schema file Schema annotations Rule and Do...

Type autocasting Number autocasting Symbol autocasting Type autocasting Crystal transparently casts elements of certain types when there is no ambiguity. Number autocasting ...

Type Compatibility A Note on Soundness Starting out Comparing two functions Function Parameter Bivariance Optional Parameters and Rest Parameters Functions with overloads En...

Creating Types from Types Generics Keyof Type Operator Typeof Type Operator Indexed Access Types Conditional Types Mapped Types Template Literal Types

DROP TYPE 功能描述 语法格式 参数说明 示例 相关链接 DROP TYPE 功能描述 删除一个用户定义的数据类型。superuser、sysadmin及类型所有者才有删除权限。 语法格式 DROP TYPE [ IF EXISTS ] name [, ...] [ CASCADE | RESTRI...

Type reflection Type reflection Crystal provides basic methods to do type reflection, casting and introspection.