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use super::{Type, Value};
use crate::types::{FromSqlError, FromSqlResult};
/// A non-owning [dynamic type value](http://sqlite.org/datatype3.html). Typically the
/// memory backing this value is owned by SQLite.
///
/// See [`Value`](Value) for an owning dynamic type value.
#[derive(Copy, Clone, Debug, PartialEq)]
pub enum ValueRef<'a> {
/// The value is a `NULL` value.
Null,
/// The value is a signed integer.
Integer(i64),
/// The value is a floating point number.
Real(f64),
/// The value is a text string.
Text(&'a [u8]),
/// The value is a blob of data
Blob(&'a [u8]),
}
impl ValueRef<'_> {
/// Returns SQLite fundamental datatype.
#[inline]
#[must_use]
pub fn data_type(&self) -> Type {
match *self {
ValueRef::Null => Type::Null,
ValueRef::Integer(_) => Type::Integer,
ValueRef::Real(_) => Type::Real,
ValueRef::Text(_) => Type::Text,
ValueRef::Blob(_) => Type::Blob,
}
}
}
impl<'a> ValueRef<'a> {
/// If `self` is case `Integer`, returns the integral value. Otherwise,
/// returns [`Err(Error::InvalidColumnType)`](crate::Error::
/// InvalidColumnType).
#[inline]
pub fn as_i64(&self) -> FromSqlResult<i64> {
match *self {
ValueRef::Integer(i) => Ok(i),
_ => Err(FromSqlError::InvalidType),
}
}
/// If `self` is case `Null` returns None.
/// If `self` is case `Integer`, returns the integral value.
/// Otherwise returns [`Err(Error::InvalidColumnType)`](crate::Error::
/// InvalidColumnType).
#[inline]
pub fn as_i64_or_null(&self) -> FromSqlResult<Option<i64>> {
match *self {
ValueRef::Null => Ok(None),
ValueRef::Integer(i) => Ok(Some(i)),
_ => Err(FromSqlError::InvalidType),
}
}
/// If `self` is case `Real`, returns the floating point value. Otherwise,
/// returns [`Err(Error::InvalidColumnType)`](crate::Error::
/// InvalidColumnType).
#[inline]
pub fn as_f64(&self) -> FromSqlResult<f64> {
match *self {
ValueRef::Real(f) => Ok(f),
_ => Err(FromSqlError::InvalidType),
}
}
/// If `self` is case `Null` returns None.
/// If `self` is case `Real`, returns the floating point value.
/// Otherwise returns [`Err(Error::InvalidColumnType)`](crate::Error::
/// InvalidColumnType).
#[inline]
pub fn as_f64_or_null(&self) -> FromSqlResult<Option<f64>> {
match *self {
ValueRef::Null => Ok(None),
ValueRef::Real(f) => Ok(Some(f)),
_ => Err(FromSqlError::InvalidType),
}
}
/// If `self` is case `Text`, returns the string value. Otherwise, returns
/// [`Err(Error::InvalidColumnType)`](crate::Error::InvalidColumnType).
#[inline]
pub fn as_str(&self) -> FromSqlResult<&'a str> {
match *self {
ValueRef::Text(t) => {
std::str::from_utf8(t).map_err(|e| FromSqlError::Other(Box::new(e)))
}
_ => Err(FromSqlError::InvalidType),
}
}
/// If `self` is case `Null` returns None.
/// If `self` is case `Text`, returns the string value.
/// Otherwise returns [`Err(Error::InvalidColumnType)`](crate::Error::
/// InvalidColumnType).
#[inline]
pub fn as_str_or_null(&self) -> FromSqlResult<Option<&'a str>> {
match *self {
ValueRef::Null => Ok(None),
ValueRef::Text(t) => std::str::from_utf8(t)
.map_err(|e| FromSqlError::Other(Box::new(e)))
.map(Some),
_ => Err(FromSqlError::InvalidType),
}
}
/// If `self` is case `Blob`, returns the byte slice. Otherwise, returns
/// [`Err(Error::InvalidColumnType)`](crate::Error::InvalidColumnType).
#[inline]
pub fn as_blob(&self) -> FromSqlResult<&'a [u8]> {
match *self {
ValueRef::Blob(b) => Ok(b),
_ => Err(FromSqlError::InvalidType),
}
}
/// If `self` is case `Null` returns None.
/// If `self` is case `Blob`, returns the byte slice.
/// Otherwise returns [`Err(Error::InvalidColumnType)`](crate::Error::
/// InvalidColumnType).
#[inline]
pub fn as_blob_or_null(&self) -> FromSqlResult<Option<&'a [u8]>> {
match *self {
ValueRef::Null => Ok(None),
ValueRef::Blob(b) => Ok(Some(b)),
_ => Err(FromSqlError::InvalidType),
}
}
/// Returns the byte slice that makes up this ValueRef if it's either
/// [`ValueRef::Blob`] or [`ValueRef::Text`].
#[inline]
pub fn as_bytes(&self) -> FromSqlResult<&'a [u8]> {
match self {
ValueRef::Text(s) | ValueRef::Blob(s) => Ok(s),
_ => Err(FromSqlError::InvalidType),
}
}
/// If `self` is case `Null` returns None.
/// If `self` is [`ValueRef::Blob`] or [`ValueRef::Text`] returns the byte
/// slice that makes up this value
#[inline]
pub fn as_bytes_or_null(&self) -> FromSqlResult<Option<&'a [u8]>> {
match *self {
ValueRef::Null => Ok(None),
ValueRef::Text(s) | ValueRef::Blob(s) => Ok(Some(s)),
_ => Err(FromSqlError::InvalidType),
}
}
}
impl From<ValueRef<'_>> for Value {
#[inline]
fn from(borrowed: ValueRef<'_>) -> Value {
match borrowed {
ValueRef::Null => Value::Null,
ValueRef::Integer(i) => Value::Integer(i),
ValueRef::Real(r) => Value::Real(r),
ValueRef::Text(s) => {
let s = std::str::from_utf8(s).expect("invalid UTF-8");
Value::Text(s.to_string())
}
ValueRef::Blob(b) => Value::Blob(b.to_vec()),
}
}
}
impl<'a> From<&'a str> for ValueRef<'a> {
#[inline]
fn from(s: &str) -> ValueRef<'_> {
ValueRef::Text(s.as_bytes())
}
}
impl<'a> From<&'a [u8]> for ValueRef<'a> {
#[inline]
fn from(s: &[u8]) -> ValueRef<'_> {
ValueRef::Blob(s)
}
}
impl<'a> From<&'a Value> for ValueRef<'a> {
#[inline]
fn from(value: &'a Value) -> ValueRef<'a> {
match *value {
Value::Null => ValueRef::Null,
Value::Integer(i) => ValueRef::Integer(i),
Value::Real(r) => ValueRef::Real(r),
Value::Text(ref s) => ValueRef::Text(s.as_bytes()),
Value::Blob(ref b) => ValueRef::Blob(b),
}
}
}
impl<'a, T> From<Option<T>> for ValueRef<'a>
where
T: Into<ValueRef<'a>>,
{
#[inline]
fn from(s: Option<T>) -> ValueRef<'a> {
match s {
Some(x) => x.into(),
None => ValueRef::Null,
}
}
}
#[cfg(any(feature = "functions", feature = "session", feature = "vtab"))]
impl<'a> ValueRef<'a> {
pub(crate) unsafe fn from_value(value: *mut crate::ffi::sqlite3_value) -> ValueRef<'a> {
use crate::ffi;
use std::slice::from_raw_parts;
match ffi::sqlite3_value_type(value) {
ffi::SQLITE_NULL => ValueRef::Null,
ffi::SQLITE_INTEGER => ValueRef::Integer(ffi::sqlite3_value_int64(value)),
ffi::SQLITE_FLOAT => ValueRef::Real(ffi::sqlite3_value_double(value)),
ffi::SQLITE_TEXT => {
let text = ffi::sqlite3_value_text(value);
let len = ffi::sqlite3_value_bytes(value);
assert!(
!text.is_null(),
"unexpected SQLITE_TEXT value type with NULL data"
);
let s = from_raw_parts(text.cast::<u8>(), len as usize);
ValueRef::Text(s)
}
ffi::SQLITE_BLOB => {
let (blob, len) = (
ffi::sqlite3_value_blob(value),
ffi::sqlite3_value_bytes(value),
);
assert!(
len >= 0,
"unexpected negative return from sqlite3_value_bytes"
);
if len > 0 {
assert!(
!blob.is_null(),
"unexpected SQLITE_BLOB value type with NULL data"
);
ValueRef::Blob(from_raw_parts(blob.cast::<u8>(), len as usize))
} else {
// The return value from sqlite3_value_blob() for a zero-length BLOB
// is a NULL pointer.
ValueRef::Blob(&[])
}
}
_ => unreachable!("sqlite3_value_type returned invalid value"),
}
}
}
|
