Trait Fetch 

pub trait Fetch<'r> {
    // Required methods
    unsafe fn fetch_column<'c>(
        statement: &'r Statement<'c>,
        column: ColumnIndex,
    ) -> Self
       where 'c: 'r;
    unsafe fn fetch_value<'c>(value: &'r ValueRef<'c>) -> Self
       where 'c: 'r;
}

A type that can be read via a sqlite3_column_* or sqlite3_value_* function.

Required Methods

unsafe fn fetch_column<'c>( statement: &'r Statement<'c>, column: ColumnIndex, ) -> Self

where 'c: 'r,

Fetch a column value from the statement.

Safety

Callers are responsible for managing the ffi::Statement lifecycle, and ensuring the ColumnIndex is in bounds.

From the SQLite reference:

If the SQL statement does not currently point to a valid row, or if the column index is out of range, the result is undefined. These routines may only be called when the most recent call to sqlite3_step has returned SQLITE_ROW and neither sqlite3_reset nor sqlite3_finalize have been called subsequently.

If any of these routines are called after sqlite3_reset or sqlite3_finalize or after sqlite3_step has returned something other than SQLITE_ROW, results are undefined. If sqlite3_step or sqlite3_reset or sqlite3_finalize are called from a different thread while any of these routines are pending, then the results are undefined.

unsafe fn fetch_value<'c>(value: &'r ValueRef<'c>) -> Self

where 'c: 'r,

Available on crate features functions or value only.

Unpack a dynamic value into this type.

Safety

Callers are responsible for managing the ffi::ValueRef lifecycle.

Dyn Compatibility

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety", so this trait is not object safe.

Implementations on Foreign Types

impl<'r> Fetch<'r> for f64

unsafe fn fetch_column<'c>( statement: &'r Statement<'c>, column: ColumnIndex, ) -> Self

where 'c: 'r,

unsafe fn fetch_value<'c>(value: &'r ValueRef<'c>) -> Self

where 'c: 'r,

Available on crate features functions or value only.

impl<'r> Fetch<'r> for i32

unsafe fn fetch_column<'c>( statement: &'r Statement<'c>, column: ColumnIndex, ) -> Self

where 'c: 'r,

unsafe fn fetch_value<'c>(value: &'r ValueRef<'c>) -> Self

where 'c: 'r,

Available on crate features functions or value only.

impl<'r> Fetch<'r> for i64

unsafe fn fetch_column<'c>( statement: &'r Statement<'c>, column: ColumnIndex, ) -> Self

where 'c: 'r,

unsafe fn fetch_value<'c>(value: &'r ValueRef<'c>) -> Self

where 'c: 'r,

Available on crate features functions or value only.

impl<'r, T> Fetch<'r> for Option<T>

where T: Fetch<'r>,

unsafe fn fetch_column<'c>( statement: &'r Statement<'c>, column: ColumnIndex, ) -> Self

where 'c: 'r,

unsafe fn fetch_value<'c>(value: &'r ValueRef<'c>) -> Self

where 'c: 'r,

Available on crate features functions or value only.

Implementors

impl<'r> Fetch<'r> for Type

impl<'r> Fetch<'r> for Borrowed<'r, str>

impl<'r> Fetch<'r> for Borrowed<'r, [u8]>

impl<'r> Fetch<'r> for OpaqueValueRef<'r>

Available on crate feature value only.

impl<'r, T: Pointee> Fetch<'r> for Pointer<'r, T>

Available on crate feature value only.

impl<'r, T: Pointee> Fetch<'r> for PointerMut<'r, T>

Available on crate feature value only.