Add binding to sqlite3_expanded_sql

src/raw_statement.rs

@@ -88,6 +88,18 @@ impl RawStatement {
     pub fn readonly(&self) -> bool {
         unsafe { ffi::sqlite3_stmt_readonly(self.0) != 0 }
     }
+
+    #[cfg(feature = "bundled")]
+    pub fn expanded_sql(&self) -> Option<&CStr> {
+        unsafe {
+            let ptr = ffi::sqlite3_expanded_sql(self.0);
+            if ptr.is_null() {
+                None
+            } else {
+                Some(CStr::from_ptr(ptr))
+            }
+        }
+    }
 }
 
 impl Drop for RawStatement {

src/statement.rs

@@ -480,6 +480,14 @@ impl<'conn> Statement<'conn> {
         }
         Ok(())
     }
+
+    /// Returns a string containing the SQL text of prepared statement with bound parameters expanded.
+    #[cfg(feature = "bundled")]
+    pub fn expanded_sql(&self) -> Option<&str> {
+        unsafe {
+            self.stmt.expanded_sql().map(|s| str::from_utf8_unchecked(s.to_bytes()))
+        }
+    }
 }
 
 impl<'conn> Into<RawStatement> for Statement<'conn> {
@@ -816,4 +824,13 @@ mod test {
         let y: Result<i64> = stmt.query_row(&[], |r| r.get("y"));
         assert_eq!(3i64, y.unwrap());
     }
+
+    #[test]
+    #[cfg(feature = "bundled")]
+    fn test_expanded_sql() {
+        let db = Connection::open_in_memory().unwrap();
+        let stmt = db.prepare("SELECT ?").unwrap();
+        stmt.bind_parameter(&1, 1).unwrap();
+        assert_eq!(Some("SELECT 1"), stmt.expanded_sql());
+    }
 }