Trait odbc_api::RowSetBuffer
source · pub unsafe trait RowSetBuffer {
// Required methods
fn bind_type(&self) -> usize;
fn row_array_size(&self) -> usize;
fn mut_num_fetch_rows(&mut self) -> &mut usize;
unsafe fn bind_colmuns_to_cursor(
&mut self,
cursor: StatementRef<'_>
) -> Result<(), Error>;
fn find_truncation(&self) -> Option<TruncationInfo>;
}Expand description
A Row set buffer binds row, or column wise buffers to a cursor in order to fill them with row sets with each call to fetch.
§Safety
Implementers of this trait must ensure that every pointer bound in bind_to_cursor stays valid
even if an instance is moved in memory. Bound members should therefore be likely references
themselves. To bind stack allocated buffers it is recommended to implement this trait on the
reference type instead.
Required Methods§
sourcefn bind_type(&self) -> usize
fn bind_type(&self) -> usize
Declares the bind type of the Row set buffer. 0 Means a columnar binding is used. Any non
zero number is interpreted as the size of a single row in a row wise binding style.
sourcefn row_array_size(&self) -> usize
fn row_array_size(&self) -> usize
The batch size for bulk cursors, if retrieving many rows at once.
sourcefn mut_num_fetch_rows(&mut self) -> &mut usize
fn mut_num_fetch_rows(&mut self) -> &mut usize
Mutable reference to the number of fetched rows.
§Safety
Implementations of this method must take care that the returned referenced stays valid, even
if self should be moved.
sourceunsafe fn bind_colmuns_to_cursor(
&mut self,
cursor: StatementRef<'_>
) -> Result<(), Error>
unsafe fn bind_colmuns_to_cursor( &mut self, cursor: StatementRef<'_> ) -> Result<(), Error>
Binds the buffer either column or row wise to the cursor.
§Safety
It’s the implementation’s responsibility to ensure that all bound buffers are valid until unbound or the statement handle is deleted.
sourcefn find_truncation(&self) -> Option<TruncationInfo>
fn find_truncation(&self) -> Option<TruncationInfo>
Find an indicator larger than the maximum element size of the buffer.