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169 lines (135 loc) 路 4.71 KB
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use std::borrow::Cow;
use std::ptr::NonNull;
use std::slice::from_raw_parts;
use std::str::from_utf8;
use std::sync::Arc;
use libsqlite3_sys::{
sqlite3_value, sqlite3_value_blob, sqlite3_value_bytes, sqlite3_value_double,
sqlite3_value_dup, sqlite3_value_int, sqlite3_value_int64, sqlite3_value_type, SQLITE_NULL,
};
use crate::error::BoxDynError;
use crate::sqlite::statement::StatementHandle;
use crate::sqlite::type_info::DataType;
use crate::sqlite::{Sqlite, SqliteTypeInfo};
use crate::value::{Value, ValueRef};
enum SqliteValueData<'r> {
Statement {
statement: &'r StatementHandle,
index: usize,
},
Value(&'r SqliteValue),
}
pub struct SqliteValueRef<'r>(SqliteValueData<'r>);
impl<'r> SqliteValueRef<'r> {
pub(crate) fn value(value: &'r SqliteValue) -> Self {
Self(SqliteValueData::Value(value))
}
pub(crate) fn statement(statement: &'r StatementHandle, index: usize) -> Self {
Self(SqliteValueData::Statement { statement, index })
}
pub(super) fn int(&self) -> i32 {
match self.0 {
SqliteValueData::Statement { statement, index } => statement.column_int(index),
SqliteValueData::Value(v) => v.int(),
}
}
pub(super) fn int64(&self) -> i64 {
match self.0 {
SqliteValueData::Statement { statement, index } => statement.column_int64(index),
SqliteValueData::Value(v) => v.int64(),
}
}
pub(super) fn double(&self) -> f64 {
match self.0 {
SqliteValueData::Statement { statement, index } => statement.column_double(index),
SqliteValueData::Value(v) => v.double(),
}
}
pub(super) fn blob(&self) -> &'r [u8] {
match self.0 {
SqliteValueData::Statement { statement, index } => statement.column_blob(index),
SqliteValueData::Value(v) => v.blob(),
}
}
pub(super) fn text(&self) -> Result<&'r str, BoxDynError> {
match self.0 {
SqliteValueData::Statement { statement, index } => statement.column_text(index),
SqliteValueData::Value(v) => v.text(),
}
}
}
impl<'r> ValueRef<'r> for SqliteValueRef<'r> {
type Database = Sqlite;
fn to_owned(&self) -> SqliteValue {
match self.0 {
SqliteValueData::Statement { statement, index } => statement.column_value(index),
SqliteValueData::Value(v) => v.clone(),
}
}
fn type_info(&self) -> Option<Cow<'_, SqliteTypeInfo>> {
match self.0 {
SqliteValueData::Statement { statement, index } => {
DataType::from_code(statement.column_type(index))
.map(SqliteTypeInfo)
.map(Cow::Owned)
}
SqliteValueData::Value(v) => v.type_info(),
}
}
fn is_null(&self) -> bool {
match self.0 {
SqliteValueData::Statement { statement, index } => {
statement.column_type(index) == SQLITE_NULL
}
SqliteValueData::Value(v) => v.is_null(),
}
}
}
#[derive(Clone)]
pub struct SqliteValue(pub(crate) Arc<NonNull<sqlite3_value>>);
// SAFE: only protected value objects are stored in SqliteValue
unsafe impl Send for SqliteValue {}
unsafe impl Sync for SqliteValue {}
impl SqliteValue {
pub(crate) unsafe fn new(value: *mut sqlite3_value) -> Self {
debug_assert!(!value.is_null());
Self(Arc::new(NonNull::new_unchecked(sqlite3_value_dup(value))))
}
fn r#type(&self) -> Option<DataType> {
DataType::from_code(unsafe { sqlite3_value_type(self.0.as_ptr()) })
}
fn int(&self) -> i32 {
unsafe { sqlite3_value_int(self.0.as_ptr()) }
}
fn int64(&self) -> i64 {
unsafe { sqlite3_value_int64(self.0.as_ptr()) }
}
fn double(&self) -> f64 {
unsafe { sqlite3_value_double(self.0.as_ptr()) }
}
fn blob(&self) -> &[u8] {
let len = unsafe { sqlite3_value_bytes(self.0.as_ptr()) } as usize;
if len == 0 {
// empty blobs are NULL so just return an empty slice
return &[];
}
let ptr = unsafe { sqlite3_value_blob(self.0.as_ptr()) } as *const u8;
debug_assert!(!ptr.is_null());
unsafe { from_raw_parts(ptr, len) }
}
fn text(&self) -> Result<&str, BoxDynError> {
Ok(from_utf8(self.blob())?)
}
}
impl Value for SqliteValue {
type Database = Sqlite;
fn as_ref(&self) -> SqliteValueRef<'_> {
SqliteValueRef::value(self)
}
fn type_info(&self) -> Option<Cow<'_, SqliteTypeInfo>> {
self.r#type().map(SqliteTypeInfo).map(Cow::Owned)
}
fn is_null(&self) -> bool {
unsafe { sqlite3_value_type(self.0.as_ptr()) == SQLITE_NULL }
}
}