Trait ColumnChangeCatalog 

pub trait ColumnChangeCatalog {
    // Required methods
    fn has_column(
        &self,
        table: &str,
        column: &str,
    ) -> Result<bool, ColumnCatalogError>;
    fn column_type(
        &self,
        table: &str,
        column: &str,
    ) -> Result<Option<ColumnType>, ColumnCatalogError>;
    fn stored_columns(
        &self,
        table: &str,
    ) -> Result<Vec<ColumnDef>, ColumnCatalogError>;
}

Read only the declared type, existence, or loaded column generation requested by an ALTER action.

Required Methods

fn has_column( &self, table: &str, column: &str, ) -> Result<bool, ColumnCatalogError>

fn column_type( &self, table: &str, column: &str, ) -> Result<Option<ColumnType>, ColumnCatalogError>

fn stored_columns( &self, table: &str, ) -> Result<Vec<ColumnDef>, ColumnCatalogError>

Dyn Compatibility

This trait is dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety".

Implementors