Trait toql_core::field_handler::FieldHandler

pub trait FieldHandler {
    fn build_filter(
        &self, 
        select: SqlExpr, 
        filter: &FieldFilter, 
        aux_params: &ParameterMap<'_>
    ) -> Result<Option<SqlExpr>, SqlBuilderError>;

    fn build_select(
        &self, 
        select: SqlExpr, 
        aux_params: &ParameterMap<'_>
    ) -> Result<Option<SqlExpr>, SqlBuilderError> { ... }
}

Required Methods

fn build_filter(
    &self,
    select: SqlExpr,
    filter: &FieldFilter,
    aux_params: &ParameterMap<'_>
) -> Result<Option<SqlExpr>, SqlBuilderError>

Match filter and return SQL expression. Do not insert parameters in the SQL expression, use ? instead. If you miss some arguments, raise an error, typically SqlBuilderError::FilterInvalid

Provided Methods

fn build_select(
    &self,
    select: SqlExpr,
    aux_params: &ParameterMap<'_>
) -> Result<Option<SqlExpr>, SqlBuilderError>

Context parameters allow to share information between different handlers Return sql and params if you want to select it.

Trait Implementations

impl Debug for dyn FieldHandler + Send + Sync + 'static

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

Formats the value using the given formatter.

Implementors

impl FieldHandler for DefaultFieldHandler