diesel-rs/diesel · error

Error finalizing SQLite prepared statement

Error message

Error finalizing SQLite prepared statement: {e:?}

What it means

Finalizing a SQLite prepared statement in its destructor returned an error instead of SQLITE_OK. The offending input is the statement's state at drop time, typically because the statement was dropped before all rows were consumed or the connection was already in an error state.

Solutions

1. Fully step through or explicitly reset the statement before dropping it
2. Drop statements before closing the underlying connection
3. Inspect the connection's extended error code to find the root cause

When it happens

Trigger: Thrown at diesel/src/sqlite/connection/stmt.rs:260 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of diesel-rs/diesel@6fa6ed01b2 (2026-09-07). Data as JSON: /api/errors/0258baaaf2ad427e. Report an issue: GitHub.

Appendix: source

Thrown at diesel/src/sqlite/connection/stmt.rs:260

    c_str.to_string_lossy().into_owned()
}

fn last_error_code(conn: *mut ffi::sqlite3) -> libc::c_int {
    unsafe { ffi::sqlite3_extended_errcode(conn) }
}

impl Drop for Statement {
    fn drop(&mut self) {
        use crate::util::std_compat::panicking;

        let raw_connection = self.raw_connection();
        let finalize_result = unsafe { ffi::sqlite3_finalize(self.inner_statement.as_ptr()) };
        if let Err(e) = ensure_sqlite_ok(finalize_result, raw_connection) {
            if panicking() {
                #[cfg(feature = "std")]
                eprintln!("Error finalizing SQLite prepared statement: {e:?}");
            } else {
                panic!("Error finalizing SQLite prepared statement: {e:?}");
            }
        }
    }
}

// A warning for future editors:
// Changing this code to something "simpler" may
// introduce undefined behaviour. Make sure you read
// the following discussions for details about
// the current version:
//
// * https://github.com/weiznich/diesel/pull/7
// * https://users.rust-lang.org/t/code-review-for-unsafe-code-in-diesel/66798/
// * https://github.com/rust-lang/unsafe-code-guidelines/issues/194
struct BoundStatement<'stmt, 'query> {
    statement: MaybeCached<'stmt, Statement>,
    // we need to store the query here to ensure no one does
    // drop it till the end of the statement

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