Trait sqlx_core::statement::Statement

source · [−]
pub trait Statement<'q>: Send + Sync {
    type Database: Database;

    fn to_owned(&self) -> <Self::Database as HasStatement<'static>>::Statement;
    fn sql(&self) -> &str;
    fn parameters(
        &self
    ) -> Option<Either<&[<Self::Database as Database>::TypeInfo], usize>>;
    fn columns(&self) -> &[<Self::Database as Database>::Column];
    fn query(
        &self
    ) -> Query<'_, Self::Database, <Self::Database as HasArguments<'_>>::Arguments>;
    fn query_with<'s, A>(&'s self, arguments: A) -> Query<'s, Self::Database, A>
    where
        A: IntoArguments<'s, Self::Database>;
    fn query_as<O>(
        &self
    ) -> QueryAs<'_, Self::Database, O, <Self::Database as HasArguments<'_>>::Arguments>
    where
        O: for<'r> FromRow<'r, <Self::Database as Database>::Row>;
    fn query_as_with<'s, O, A>(
        &'s self, 
        arguments: A
    ) -> QueryAs<'s, Self::Database, O, A>
    where
        O: for<'r> FromRow<'r, <Self::Database as Database>::Row>,
        A: IntoArguments<'s, Self::Database>;
    fn query_scalar<O>(
        &self
    ) -> QueryScalar<'_, Self::Database, O, <Self::Database as HasArguments<'_>>::Arguments>
    where
        (O,): for<'r> FromRow<'r, <Self::Database as Database>::Row>;
    fn query_scalar_with<'s, O, A>(
        &'s self, 
        arguments: A
    ) -> QueryScalar<'s, Self::Database, O, A>
    where
        (O,): for<'r> FromRow<'r, <Self::Database as Database>::Row>,
        A: IntoArguments<'s, Self::Database>;

    fn column<I>(&self, index: I) -> &<Self::Database as Database>::Column
    where
        I: ColumnIndex<Self>,
    { ... }
    fn try_column<I>(
        &self, 
        index: I
    ) -> Result<&<Self::Database as Database>::Column, Error>
    where
        I: ColumnIndex<Self>,
    { ... }
}
Expand description

An explicitly prepared statement.

Statements are prepared and cached by default, per connection. This type allows you to look at that cache in-between the statement being prepared and it being executed. This contains the expected columns to be returned and the expected parameter types (if available).

Statements can be re-used with any connection and on first-use it will be re-prepared and cached within the connection.

Required Associated Types

Required Methods

Creates an owned statement from this statement reference. This copies the original SQL text.

Get the original SQL text used to create this statement.

Get the expected parameters for this statement.

The information returned depends on what is available from the driver. SQLite can only tell us the number of parameters. PostgreSQL can give us full type information.

Get the columns expected to be returned by executing this statement.

Provided Methods

Gets the column information at index.

A string index can be used to access a column by name and a usize index can be used to access a column by position.

Panics

Panics if index is out of bounds. See try_column for a non-panicking version.

Gets the column information at index or None if out of bounds.

Implementors