INNER CODE UNIT · Rust

try_apply_migrations

aannoo/hcom · src/db/mod.rs:738

    fn try_apply_migrations(&self, old_version: i32) -> Result<bool> {
        if old_version <= 0 || old_version >= SCHEMA_VERSION {
            return Ok(false);
        }
        let tx = self.conn.unchecked_transaction()?;
        for next_version in (old_version + 1)..=SCHEMA_VERSION {
            if next_version == 17 {
                let has_launch_context = tx
                    .prepare("PRAGMA table_info(instances)")?
                    .query_map([], |row| row.get::<_, String>(1))?
                    .filter_map(|r| r.ok())
                    .any(|col| col == "launch_context");
                if !has_launch_context {
                    tx.execute(
                        "ALTER TABLE instances ADD COLUMN launch_context TEXT DEFAULT ''",
                        [],
                    )?;
                }

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