Trait odbc_api::parameter::VarKind

pub unsafe trait VarKind {
    const TERMINATING_ZEROES: usize;
    const C_DATA_TYPE: CDataType;

    fn relational_type(length: usize) -> DataType;
}

A tag used to differentiate between different types of variadic buffers.

Safety

• TERMINATING_ZEROES is used to calculate buffer offsets.
• C_DATA_TYPE is used to bind parameters. Providing wrong values like e.g. a fixed length types, would cause even a correctly implemented odbc driver to access invalid memory.

Required Associated Constants

const TERMINATING_ZEROES: usize

Number of terminating zeroes required for this kind of variadic buffer.

const C_DATA_TYPE: CDataType

Required Methods

fn relational_type(length: usize) -> DataType

Implementors

impl VarKind for Binary

const TERMINATING_ZEROES: usize = 0usize

const C_DATA_TYPE: CDataType = CDataType::Binary

impl VarKind for Text

const TERMINATING_ZEROES: usize = 1usize

const C_DATA_TYPE: CDataType = CDataType::Char