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104 lines
2.6 KiB
104 lines
2.6 KiB
//! Ensure Virtual tables can be declared outside `rusqlite` crate.
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#[cfg(feature = "vtab")]
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#[test]
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fn test_dummy_module() {
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use rusqlite::types::ToSql;
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use rusqlite::vtab::{
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eponymous_only_module, sqlite3_vtab, sqlite3_vtab_cursor, Context, IndexInfo, VTab,
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VTabConnection, VTabCursor, Values,
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};
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use rusqlite::{version_number, Connection, Result};
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use std::marker::PhantomData;
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use std::os::raw::c_int;
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let module = eponymous_only_module::<DummyTab>();
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#[repr(C)]
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struct DummyTab {
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/// Base class. Must be first
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base: sqlite3_vtab,
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}
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unsafe impl<'vtab> VTab<'vtab> for DummyTab {
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type Aux = ();
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type Cursor = DummyTabCursor<'vtab>;
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fn connect(
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_: &mut VTabConnection,
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_aux: Option<&()>,
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_args: &[&[u8]],
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) -> Result<(String, DummyTab)> {
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let vtab = DummyTab {
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base: sqlite3_vtab::default(),
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};
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Ok(("CREATE TABLE x(value)".to_owned(), vtab))
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}
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fn best_index(&self, info: &mut IndexInfo) -> Result<()> {
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info.set_estimated_cost(1.);
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Ok(())
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}
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fn open(&'vtab self) -> Result<DummyTabCursor<'vtab>> {
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Ok(DummyTabCursor::default())
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}
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}
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#[derive(Default)]
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#[repr(C)]
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struct DummyTabCursor<'vtab> {
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/// Base class. Must be first
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base: sqlite3_vtab_cursor,
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/// The rowid
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row_id: i64,
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phantom: PhantomData<&'vtab DummyTab>,
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}
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unsafe impl VTabCursor for DummyTabCursor<'_> {
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fn filter(
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&mut self,
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_idx_num: c_int,
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_idx_str: Option<&str>,
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_args: &Values<'_>,
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) -> Result<()> {
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self.row_id = 1;
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Ok(())
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}
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fn next(&mut self) -> Result<()> {
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self.row_id += 1;
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Ok(())
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}
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fn eof(&self) -> bool {
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self.row_id > 1
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}
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fn column(&self, ctx: &mut Context, _: c_int) -> Result<()> {
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ctx.set_result(&self.row_id)
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}
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fn rowid(&self) -> Result<i64> {
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Ok(self.row_id)
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}
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}
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let db = Connection::open_in_memory().unwrap();
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db.create_module::<DummyTab>("dummy", &module, None)
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.unwrap();
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let version = version_number();
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if version < 3_008_012 {
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return;
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}
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let mut s = db.prepare("SELECT * FROM dummy()").unwrap();
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let dummy = s
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.query_row(&[] as &[&dyn ToSql], |row| row.get::<_, i32>(0))
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.unwrap();
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assert_eq!(1, dummy);
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}
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