> ## Documentation Index > Fetch the complete documentation index at: https://docs.prefect.io/llms.txt > Use this file to discover all available pages before exploring further. # variables # `prefect.server.models.variables` ## Functions ### `emit_variable_created_event` ```python theme={null} emit_variable_created_event(variable: orm_models.Variable) -> None ``` Emit an event when a variable is created. ### `emit_variable_updated_event` ```python theme={null} emit_variable_updated_event(variable: orm_models.Variable) -> None ``` Emit an event when a variable is updated. ### `emit_variable_deleted_event` ```python theme={null} emit_variable_deleted_event(variable: orm_models.Variable) -> None ``` Emit an event when a variable is deleted. ### `create_variable` ```python theme={null} create_variable(db: PrefectDBInterface, session: AsyncSession, variable: VariableCreate) -> orm_models.Variable ``` Create a variable **Args:** * `session`: async database session * `variable`: variable to create **Returns:** * orm\_models.Variable ### `read_variable` ```python theme={null} read_variable(db: PrefectDBInterface, session: AsyncSession, variable_id: UUID) -> Optional[orm_models.Variable] ``` Reads a variable by id. ### `read_variable_by_name` ```python theme={null} read_variable_by_name(db: PrefectDBInterface, session: AsyncSession, name: str) -> Optional[orm_models.Variable] ``` Reads a variable by name. ### `read_variables` ```python theme={null} read_variables(db: PrefectDBInterface, session: AsyncSession, variable_filter: Optional[filters.VariableFilter] = None, sort: sorting.VariableSort = sorting.VariableSort.NAME_ASC, offset: Optional[int] = None, limit: Optional[int] = None) -> Sequence[orm_models.Variable] ``` Read variables, applying filers. ### `count_variables` ```python theme={null} count_variables(db: PrefectDBInterface, session: AsyncSession, variable_filter: Optional[filters.VariableFilter] = None) -> int ``` Count variables, applying filters. ### `update_variable` ```python theme={null} update_variable(db: PrefectDBInterface, session: AsyncSession, variable_id: UUID, variable: VariableUpdate) -> bool ``` Updates a variable by id. ### `update_variable_by_name` ```python theme={null} update_variable_by_name(db: PrefectDBInterface, session: AsyncSession, name: str, variable: VariableUpdate) -> bool ``` Updates a variable by name. ### `delete_variable` ```python theme={null} delete_variable(db: PrefectDBInterface, session: AsyncSession, variable_id: UUID) -> bool ``` Delete a variable by id. ### `delete_variable_by_name` ```python theme={null} delete_variable_by_name(db: PrefectDBInterface, session: AsyncSession, name: str) -> bool ``` Delete a variable by name.