Struct mz_sql :: session :: vars :: SessionVar Copy item path

impl SessionVar

pub fn new(var: VarDefinition) -> Self

pub fn check(&self, input: VarInput<'_>) -> Result<String, VarError>

Checks if the provided VarInput is valid for the current session variable, returning the formatted output if it’s valid.

pub fn set(&mut self, input: VarInput<'_>, local: bool) -> Result<(), VarError>

Parse the input and update the stored value to match.

pub fn set_default(&mut self, input: VarInput<'_>) -> Result<(), VarError>

Sets the default value for the variable.

pub fn reset(&mut self, local: bool)

Reset the stored value to the default.

pub fn end_transaction(&self, action: EndTransactionAction) -> Option<Self>

Returns a possibly new SessionVar if this needs to mutate at transaction end.

pub fn is_mutating(&self) -> bool

Whether this Var needs to mutate at the end of a transaction.

pub fn value_dyn(&self) -> &dyn Value

pub fn inspect_session_value(&self) -> Option<&dyn Value>

Returns the Value that is currently stored as the session_value.

Note: This should only be used for inspection, if you want to determine the current value of this SessionVar you should use SessionVar::value.

Trait Implementations§

impl Clone for SessionVar

fn clone(&self) -> Self

Returns a copy of the value. Read more

1.0.0 · source§

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

Performs copy-assignment from source. Read more

impl Debug for SessionVar

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

Formats the value using the given formatter. Read more

impl Var for SessionVar

fn name(&self) -> &'static str

Returns the name of the configuration parameter.

fn value(&self) -> String

Constructs a flattened string representation of the current value of the configuration parameter. Read more

fn description(&self) -> &'static str

Returns a short sentence describing the purpose of the configuration parameter.

fn type_name(&self) -> Cow<'static, str>

Returns the name of the type of this variable.

fn visible( &self, user: &User, system_vars: Option<&SystemVars> ) -> Result<(), VarError>

Indicates wither the Var is visible as a function of the user and system_vars. “Invisible” parameters return VarErrors. Read more

fn as_var(&self) -> &dyn Var
where Self: Sized,

Upcast self to a dyn Var, useful when working with multiple different implementors of Var.

Auto Trait Implementations§

impl !UnwindSafe for SessionVar

Blanket Implementations§

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

fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more

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Causes self to use its LowerExp implementation when Debug-formatted.

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