working serialized writes with panics on failure. Everything seems to be working

crates/sqlez/src/connection.rs

@@ -10,16 +10,18 @@ use libsqlite3_sys::*;
 pub struct Connection {
     pub(crate) sqlite3: *mut sqlite3,
     persistent: bool,
-    phantom: PhantomData<sqlite3>,
+    pub(crate) write: bool,
+    _sqlite: PhantomData<sqlite3>,
 }
 unsafe impl Send for Connection {}
 
 impl Connection {
-    fn open(uri: &str, persistent: bool) -> Result<Self> {
+    pub(crate) fn open(uri: &str, persistent: bool) -> Result<Self> {
         let mut connection = Self {
             sqlite3: 0 as *mut _,
             persistent,
-            phantom: PhantomData,
+            write: true,
+            _sqlite: PhantomData,
         };
 
         let flags = SQLITE_OPEN_CREATE | SQLITE_OPEN_NOMUTEX | SQLITE_OPEN_READWRITE;
@@ -60,6 +62,10 @@ impl Connection {
         self.persistent
     }
 
+    pub fn can_write(&self) -> bool {
+        self.write
+    }
+
     pub fn backup_main(&self, destination: &Connection) -> Result<()> {
         unsafe {
             let backup = sqlite3_backup_init(