Struct SchemaDiff

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pub struct SchemaDiff {
    pub added_tables: Vec<TableDef>,
    pub dropped_tables: Vec<String>,
    pub added_columns: Vec<(String, ColumnDef)>,
    pub dropped_columns: Vec<(String, String)>,
    pub type_changed_columns: Vec<(String, ColumnDef, ColumnDef)>,
    pub renamed_columns: Vec<(String, String, String)>,
}

Expand description

Schema 差异

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§added_tables: Vec<TableDef>

新增的表（实体有，DB 无）

§dropped_tables: Vec<String>

删除的表（DB 有，实体无）— 破坏性，仅记录不执行

§added_columns: Vec<(String, ColumnDef)>

新增的列（实体有，DB 无）

§dropped_columns: Vec<(String, String)>

删除的列（DB 有，实体无）— 破坏性，仅记录不执行

§type_changed_columns: Vec<(String, ColumnDef, ColumnDef)>

类型变更的列

§renamed_columns: Vec<(String, String, String)>

重命名的列（启发式：同位置不同名）

Implementations§

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impl SchemaDiff

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pub fn is_empty(&self) -> bool

是否为空（无任何变更）

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pub fn has_destructive_changes(&self) -> bool

是否含破坏性变更

Trait Implementations§

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impl Clone for SchemaDiff

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fn clone(&self) -> SchemaDiff

Returns a duplicate of the value. Read more

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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more

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impl Debug for SchemaDiff

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fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more

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impl Default for SchemaDiff

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fn default() -> SchemaDiff

Returns the “default value” for a type. Read more

Auto Trait Implementations§

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impl UnwindSafe for SchemaDiff

Blanket Implementations§

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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more

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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more

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impl<T> BorrowMut<T> for T
where T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more

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impl<T> CloneToUninit for T
where T: Clone,

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unsafe fn clone_to_uninit(&self, dest: *mut u8)

🔬This is a nightly-only experimental API. (clone_to_uninit)

Performs copy-assignment from self to dest. Read more

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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T> Instrument for T

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fn instrument(self, span: Span) -> Instrumented<Self> ⓘ

Instruments this type with the provided Span, returning an Instrumented wrapper. Read more

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fn in_current_span(self) -> Instrumented<Self> ⓘ

Instruments this type with the current Span, returning an Instrumented wrapper. Read more

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impl<T, U> Into for T
where U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T> IntoEither for T

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fn into_either(self, into_left: bool) -> Either<Self, Self> ⓘ

Converts self into a Left variant of Either<Self, Self> if into_left is true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more

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fn into_either_with<F>(self, into_left: F) -> Either<Self, Self> ⓘ
where F: FnOnce(&Self) -> bool,

Converts self into a Left variant of Either<Self, Self> if into_left(&self) returns true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more

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