rusqlite/src/context.rs

76 lines
2.6 KiB
Rust
Raw Normal View History

2018-05-13 19:03:05 +08:00
//! Code related to `sqlite3_context` common to `functions` and `vtab` modules.
use std::os::raw::{c_int, c_void};
#[cfg(feature = "array")]
use std::rc::Rc;
2018-05-13 19:03:05 +08:00
2018-10-31 03:11:35 +08:00
use crate::ffi;
use crate::ffi::sqlite3_context;
2018-05-13 19:03:05 +08:00
use crate::str_for_sqlite;
2018-10-31 03:11:35 +08:00
use crate::types::{ToSqlOutput, ValueRef};
#[cfg(feature = "array")]
2018-10-31 03:11:35 +08:00
use crate::vtab::array::{free_array, ARRAY_TYPE};
2018-05-13 19:03:05 +08:00
// This function is inline despite it's size because what's in the ToSqlOutput
// is often known to the compiler, and thus const prop/DCE can substantially
// simplify the function.
#[inline]
pub(super) unsafe fn set_result(ctx: *mut sqlite3_context, result: &ToSqlOutput<'_>) {
2018-05-13 19:03:05 +08:00
let value = match *result {
ToSqlOutput::Borrowed(v) => v,
ToSqlOutput::Owned(ref v) => ValueRef::from(v),
#[cfg(feature = "blob")]
ToSqlOutput::ZeroBlob(len) => {
// TODO sqlite3_result_zeroblob64 // 3.8.11
2018-05-13 19:03:05 +08:00
return ffi::sqlite3_result_zeroblob(ctx, len);
}
#[cfg(feature = "array")]
ToSqlOutput::Array(ref a) => {
return ffi::sqlite3_result_pointer(
ctx,
Rc::into_raw(a.clone()) as *mut c_void,
ARRAY_TYPE,
Some(free_array),
);
}
2018-05-13 19:03:05 +08:00
};
match value {
ValueRef::Null => ffi::sqlite3_result_null(ctx),
ValueRef::Integer(i) => ffi::sqlite3_result_int64(ctx, i),
ValueRef::Real(r) => ffi::sqlite3_result_double(ctx, r),
ValueRef::Text(s) => {
let length = s.len();
if length > c_int::max_value() as usize {
2018-05-13 19:03:05 +08:00
ffi::sqlite3_result_error_toobig(ctx);
} else {
let (c_str, len, destructor) = match str_for_sqlite(s) {
2018-05-13 19:03:05 +08:00
Ok(c_str) => c_str,
// TODO sqlite3_result_error
Err(_) => return ffi::sqlite3_result_error_code(ctx, ffi::SQLITE_MISUSE),
};
// TODO sqlite3_result_text64 // 3.8.7
ffi::sqlite3_result_text(ctx, c_str, len, destructor);
2018-05-13 19:03:05 +08:00
}
}
ValueRef::Blob(b) => {
let length = b.len();
if length > c_int::max_value() as usize {
2018-05-13 19:03:05 +08:00
ffi::sqlite3_result_error_toobig(ctx);
} else if length == 0 {
2022-01-06 02:53:49 +08:00
ffi::sqlite3_result_zeroblob(ctx, 0);
2018-05-13 19:03:05 +08:00
} else {
// TODO sqlite3_result_blob64 // 3.8.7
2018-05-13 19:03:05 +08:00
ffi::sqlite3_result_blob(
ctx,
2022-01-06 02:50:25 +08:00
b.as_ptr().cast::<c_void>(),
2018-05-13 19:03:05 +08:00
length as c_int,
ffi::SQLITE_TRANSIENT(),
);
}
}
}
}