Trait AssignmentColumnCatalog 

pub trait AssignmentColumnCatalog {
    // Required methods
    fn try_describe_table(
        &self,
        table: &str,
    ) -> Result<Option<Vec<ColumnDef>>, ColumnCatalogError>;
    fn columns_declared(&self, table: &str) -> Result<bool, ColumnCatalogError>;
    fn try_column_insert_default_expr(
        &self,
        table: &str,
        column: &str,
    ) -> Result<Option<Expr>, ColumnCatalogError>;

    // Provided method
    fn try_column_shape(
        &self,
        table: &str,
        column: &str,
    ) -> Result<Option<Option<ColumnShape>>, ColumnCatalogError> { ... }
}

Required Methods

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

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

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

Provided Methods

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

The type and generated kind of one column: None for an unknown table, and an inner None for a column the table does not declare. Every written value asks for it, so a catalog answers from the column alone. The default describes the whole table, which copies every column and resolves every default expression.

Dyn Compatibility

This trait is dyn compatible.

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

Implementors