Function register_sha256_functions 

pub fn register_sha256_functions(conn: &Connection) -> Result<()>

Register the sha256 SQL function with the given SQLite connection. The function takes a single argument and returns the SHA256 hash (blob) of that argument. The argument can be either a string or a blob. If the argument is NULL, the result is NULL.

Example

let db = Connection::open_in_memory()?;
register_sha256_functions(&db)?;
let hash: Vec<u8> = db.query_row("SELECT sha256('hello')", [], |r| r.get(0))?;
let expected = b"\x2c\xf2\x4d\xba\x5f\xb0\xa3\x0e\x26\xe8\x3b\x2a\xc5\xb9\xe2\x9e\x1b\x16\x1e\x5c\x1f\xa7\x42\x5e\x73\x04\x33\x62\x93\x8b\x98\x24";
assert_eq!(hash, expected);