Address review comments @rnewman

core/src/lib.rs

@@ -329,6 +329,78 @@ impl From<f64> for TypedValue {
     }
 }
 
+impl TypedValue {
+    pub fn into_entid(self) -> Option<Entid> {
+        match self {
+            TypedValue::Ref(v) => Some(v),
+            _ => None,
+        }
+    }
+
+    pub fn into_kw(self) -> Option<Rc<NamespacedKeyword>> {
+        match self {
+            TypedValue::Keyword(v) => Some(v),
+            _ => None,
+        }
+    }
+
+    pub fn into_boolean(self) -> Option<bool> {
+        match self {
+            TypedValue::Boolean(v) => Some(v),
+            _ => None,
+        }
+    }
+
+    pub fn into_long(self) -> Option<i64> {
+        match self {
+            TypedValue::Long(v) => Some(v),
+            _ => None,
+        }
+    }
+
+    pub fn into_double(self) -> Option<f64> {
+        match self {
+            TypedValue::Double(v) => Some(v.into_inner()),
+            _ => None,
+        }
+    }
+
+    pub fn into_instant(self) -> Option<DateTime<Utc>> {
+        match self {
+            TypedValue::Instant(v) => Some(v),
+            _ => None,
+        }
+    }
+
+    pub fn into_timestamp(self) -> Option<i64> {
+        match self {
+            TypedValue::Instant(v) => Some(v.timestamp()),
+            _ => None,
+        }
+    }
+
+    pub fn into_string(self) -> Option<Rc<String>> {
+        match self {
+            TypedValue::String(v) => Some(v),
+            _ => None,
+        }
+    }
+
+    pub fn into_uuid(self) -> Option<Uuid> {
+        match self {
+            TypedValue::Uuid(v) => Some(v),
+            _ => None,
+        }
+    }
+
+    pub fn into_uuid_string(self) -> Option<String> {
+        match self {
+            TypedValue::Uuid(v) => Some(v.hyphenated().to_string()),
+            _ => None,
+        }
+    }
+}
+
 /// Type safe representation of the possible return values from SQLite's `typeof`
 #[derive(Clone, Copy, Debug, Eq, Hash, Ord, PartialOrd, PartialEq)]
 pub enum SQLTypeAffinity {

ffi/Cargo.toml

@@ -3,5 +3,8 @@ name = "mentat_ffi"
 version = "0.1.0"
 authors = ["Emily Toop <etoop@mozilla.com>"]
 
+[dependencies]
+libc = "0.2"
+
 [dependencies.mentat]
 path = ".."

ffi/src/lib.rs

@@ -8,6 +8,7 @@
 // CONDITIONS OF ANY KIND, either express or implied. See the License for the
 // specific language governing permissions and limitations under the License.
 
+extern crate libc;
 extern crate mentat;
 
 use std::collections::{
@@ -16,23 +17,34 @@ use std::collections::{
 use std::os::raw::{
     c_char,
     c_int,
+    c_void,
 };
 use std::slice;
 use std::sync::{
     Arc,
 };
+use std::vec;
+
+use libc::time_t;
 
 pub use mentat::{
     Entid,
+    FindSpec,
     HasSchema,
+    KnownEntid,
     NamespacedKeyword,
+    Queryable,
+    QueryBuilder,
+    QueryInputs,
+    QueryOutput,
+    QueryResults,
     Store,
     Syncable,
+    TypedValue,
     TxObserver,
-};
-
-pub use mentat::errors::{
-    Result,
+    Uuid,
+    ValueType,
+    Variable,
 };
 
 pub mod android;
@@ -40,11 +52,13 @@ pub mod utils;
 
 pub use utils::strings::{
     c_char_to_string,
+    c_char_from_rc,
+    kw_from_string,
     string_to_c_char,
-    str_to_c_char,
 };
 
-use utils::log;
+pub type TypedValueIterator = vec::IntoIter<TypedValue>;
+pub type TypedValueListIterator = vec::IntoIter<Vec<TypedValue>>;
 
 #[repr(C)]
 #[derive(Debug, Clone)]
@@ -62,21 +76,39 @@ pub struct ExternTxReportList {
 }
 
 #[repr(C)]
-pub struct ExternResult {
-    pub error: *const c_char,
+#[derive(Debug)]
+pub struct ExternOption {
+    pub value: *mut c_void,
 }
 
-impl From<Result<()>> for ExternResult {
-    fn from(result: Result<()>) -> Self {
+impl<T> From<Option<T>> for ExternOption {
+    fn from(option: Option<T>) -> Self {
+        ExternOption {
+            value: option.map_or(std::ptr::null_mut(), |v| Box::into_raw(Box::new(v)) as *mut _ as *mut c_void)
+        }
+    }
+}
+
+#[repr(C)]
+#[derive(Debug)]
+pub struct ExternResult {
+    pub ok: *const c_void,
+    pub err: *const c_char,
+}
+
+impl<T, E> From<Result<T, E>> for ExternResult where E: std::error::Error {
+    fn from(result: Result<T, E>) -> Self {
         match result {
-            Ok(_) => {
+            Ok(value) => {
                 ExternResult {
-                    error: std::ptr::null(),
+                    err: std::ptr::null(),
+                    ok: Box::into_raw(Box::new(value)) as *const _ as *const c_void,
                 }
             },
             Err(e) => {
                 ExternResult {
-                    error: string_to_c_char(e.description().into())
+                    err: string_to_c_char(e.description()),
+                    ok: std::ptr::null(),
                 }
             }
         }
@@ -85,7 +117,7 @@ impl From<Result<()>> for ExternResult {
 
 // A store cannot be opened twice to the same location.
 // Once created, the reference to the store is held by the caller and not Rust,
-// therefore the caller is responsible for calling `store_destroy` to release the memory
+// therefore the caller is responsible for calling `destroy` to release the memory
 // used by the Store in order to avoid a memory leak.
 // TODO: Start returning `ExternResult`s rather than crashing on error.
 #[no_mangle]
@@ -95,10 +127,364 @@ pub extern "C" fn store_open(uri: *const c_char) -> *mut Store {
     Box::into_raw(Box::new(store))
 }
 
-// Reclaim the memory for the provided Store and drop, therefore releasing it.
+// TODO: open empty
+
+// TODO: dismantle
+
+// TODO: conn
+
+// TODO: begin_read
+
+// TODO: begin_transaction
+
+// TODO: cache
+
+// TODO: q_once
 #[no_mangle]
-pub unsafe extern "C" fn store_destroy(store: *mut Store) {
-    let _ = Box::from_raw(store);
+pub unsafe extern "C" fn store_query<'a>(store: *mut Store, query: *const c_char) -> *mut QueryBuilder<'a> {
+    let query = c_char_to_string(query);
+    let store = &mut*store;
+    let query_builder = QueryBuilder::new(store, query);
+    Box::into_raw(Box::new(query_builder))
+}
+
+#[no_mangle]
+pub unsafe extern "C" fn query_builder_bind_int(query_builder: *mut QueryBuilder, var: *const c_char, value: c_int) {
+    let var = c_char_to_string(var);
+    let query_builder = &mut*query_builder;
+    let value = value as i32;
+    query_builder.bind_value(&var, value);
+}
+
+#[no_mangle]
+pub unsafe extern "C" fn query_builder_bind_long(query_builder: *mut QueryBuilder, var: *const c_char, value: i64) {
+    let var = c_char_to_string(var);
+    let query_builder = &mut*query_builder;
+   query_builder.bind_long(&var, value);
+}
+
+#[no_mangle]
+pub unsafe extern "C" fn query_builder_bind_ref(query_builder: *mut QueryBuilder, var: *const c_char, value: i64) {
+    let var = c_char_to_string(var);
+    let query_builder = &mut*query_builder;
+    query_builder.bind_ref(&var, value);
+}
+
+#[no_mangle]
+pub unsafe extern "C" fn query_builder_bind_ref_kw(query_builder: *mut QueryBuilder, var: *const c_char, value: *const c_char) {
+    let var = c_char_to_string(var);
+    let kw = kw_from_string(c_char_to_string(value));
+    let query_builder = &mut*query_builder;
+    if let Some(err) = query_builder.bind_ref_from_kw(&var, kw).err() {
+        panic!(err);
+    }
+}
+
+#[no_mangle]
+pub unsafe extern "C" fn query_builder_bind_kw(query_builder: *mut QueryBuilder, var: *const c_char, value: *const c_char) {
+    let var = c_char_to_string(var);
+    let query_builder = &mut*query_builder;
+    let kw = kw_from_string(c_char_to_string(value));
+    query_builder.bind_value(&var, kw);
+}
+
+// boolean
+#[no_mangle]
+pub unsafe extern "C" fn query_builder_bind_boolean(query_builder: *mut QueryBuilder, var: *const c_char, value: bool) {
+    let var = c_char_to_string(var);
+    let query_builder = &mut*query_builder;
+    query_builder.bind_value(&var, value);
+}
+
+// double
+#[no_mangle]
+pub unsafe extern "C" fn query_builder_bind_double(query_builder: *mut QueryBuilder, var: *const c_char, value: f64) {
+    let var = c_char_to_string(var);
+    let query_builder = &mut*query_builder;
+    query_builder.bind_value(&var, value);
+}
+
+// instant
+#[no_mangle]
+pub unsafe extern "C" fn query_builder_bind_timestamp(query_builder: *mut QueryBuilder, var: *const c_char, value: time_t) {
+    let var = c_char_to_string(var);
+    let query_builder = &mut*query_builder;
+    query_builder.bind_instant(&var, value as i64);
+}
+
+// string
+#[no_mangle]
+pub unsafe extern "C" fn query_builder_bind_string(query_builder: *mut QueryBuilder, var: *const c_char, value: *const c_char) {
+    let var = c_char_to_string(var);
+    let value = c_char_to_string(value);
+    let query_builder = &mut*query_builder;
+    query_builder.bind_value(&var, value);
+}
+
+// uuid
+#[no_mangle]
+pub unsafe extern "C" fn query_builder_bind_uuid(query_builder: *mut QueryBuilder, var: *const c_char, value: *const c_char) {
+    let var = c_char_to_string(var);
+    let value = Uuid::parse_str(&c_char_to_string(value)).expect("valid uuid");
+    let query_builder = &mut*query_builder;
+    query_builder.bind_value(&var, value);
+}
+
+#[no_mangle]
+pub unsafe extern "C" fn query_builder_execute_scalar(query_builder: *mut QueryBuilder) -> *mut ExternResult {
+    let query_builder = &mut*query_builder;
+    let results = query_builder.execute_scalar();
+    Box::into_raw(Box::new(results.into()))
+}
+
+#[no_mangle]
+pub unsafe extern "C" fn query_builder_execute_coll(query_builder: *mut QueryBuilder) -> *mut ExternResult {
+    let query_builder = &mut*query_builder;
+    let results = query_builder.execute_coll();
+    Box::into_raw(Box::new(results.into()))
+}
+
+#[no_mangle]
+pub unsafe extern "C" fn query_builder_execute_tuple(query_builder: *mut QueryBuilder) -> *mut ExternResult {
+    let query_builder = &mut*query_builder;
+    let results = query_builder.execute_tuple();
+    Box::into_raw(Box::new(results.into()))
+}
+
+#[no_mangle]
+pub unsafe extern "C" fn query_builder_execute(query_builder: *mut QueryBuilder) -> *mut ExternResult {
+    let query_builder = &mut*query_builder;
+    let results = query_builder.execute_rel();
+    Box::into_raw(Box::new(results.into()))
+}
+
+// as_long
+#[no_mangle]
+pub unsafe extern "C" fn typed_value_as_long(typed_value: *mut TypedValue) ->  i64 {
+    let typed_value = Box::from_raw(typed_value);
+    typed_value.into_long().expect("Typed value cannot be coerced into a Long")
+}
+
+// as_entid
+#[no_mangle]
+pub unsafe extern "C" fn typed_value_as_entid(typed_value: *mut TypedValue) ->  Entid {
+    let typed_value = Box::from_raw(typed_value);
+    typed_value.into_entid().expect("Typed value cannot be coerced into an Entid")
+}
+
+// kw
+#[no_mangle]
+pub unsafe extern "C" fn typed_value_as_kw(typed_value: *mut TypedValue) ->  *const c_char {
+    let typed_value = Box::from_raw(typed_value);
+    string_to_c_char(typed_value.into_kw().expect("Typed value cannot be coerced into a Namespaced Keyword").to_string())
+}
+
+//as_boolean
+#[no_mangle]
+pub unsafe extern "C" fn typed_value_as_boolean(typed_value: *mut TypedValue) ->  bool {
+    let typed_value = Box::from_raw(typed_value);
+    typed_value.into_boolean().expect("Typed value cannot be coerced into a Boolean")
+}
+
+//as_double
+#[no_mangle]
+pub unsafe extern "C" fn typed_value_as_double(typed_value: *mut TypedValue) ->  f64 {
+    let typed_value = Box::from_raw(typed_value);
+    typed_value.into_double().expect("Typed value cannot be coerced into a Double")
+}
+
+//as_timestamp
+#[no_mangle]
+pub unsafe extern "C" fn typed_value_as_timestamp(typed_value: *mut TypedValue) ->  i64 {
+    let typed_value = Box::from_raw(typed_value);
+    let val = typed_value.into_timestamp().expect("Typed value cannot be coerced into a Timestamp");
+    val
+}
+
+//as_string
+#[no_mangle]
+pub unsafe extern "C" fn typed_value_as_string(typed_value: *mut TypedValue) ->  *const c_char {
+    let typed_value = Box::from_raw(typed_value);
+    c_char_from_rc(typed_value.into_string().expect("Typed value cannot be coerced into a String"))
+}
+
+//as_uuid
+#[no_mangle]
+pub unsafe extern "C" fn typed_value_as_uuid(typed_value: *mut TypedValue) ->  *const c_char {
+    let typed_value = Box::from_raw(typed_value);
+    string_to_c_char(typed_value.into_uuid_string().expect("Typed value cannot be coerced into a Uuid"))
+}
+
+#[no_mangle]
+pub unsafe extern "C" fn row_at_index(rows: *mut Vec<Vec<TypedValue>>, index: c_int) ->  *mut Vec<TypedValue> {
+    let result = &*rows;
+    result.get(index as usize).map_or(std::ptr::null_mut(), |v| Box::into_raw(Box::new(v.clone())))
+}
+
+#[no_mangle]
+pub unsafe extern "C" fn rows_iter(rows: *mut Vec<Vec<TypedValue>>) ->  *mut TypedValueListIterator {
+    let result = Box::from_raw(rows);
+    Box::into_raw(Box::new(result.into_iter()))
+}
+
+#[no_mangle]
+pub unsafe extern "C" fn rows_iter_next(iter: *mut TypedValueListIterator) ->  *mut Vec<TypedValue> {
+    let iter = &mut *iter;
+    iter.next().map_or(std::ptr::null_mut(), |v| Box::into_raw(Box::new(v)))
+}
+
+#[no_mangle]
+pub unsafe extern "C" fn values_iter(values: *mut Vec<TypedValue>) ->  *mut TypedValueIterator {
+    let result = Box::from_raw(values);
+    Box::into_raw(Box::new(result.into_iter()))
+}
+
+#[no_mangle]
+pub unsafe extern "C" fn values_iter_next(iter: *mut TypedValueIterator) ->  *const TypedValue {
+    let iter = &mut *iter;
+    iter.next().map_or(std::ptr::null_mut(), |v| &v as *const TypedValue)
+}
+
+//as_long
+#[no_mangle]
+pub unsafe extern "C" fn values_iter_next_as_long(iter: *mut TypedValueIterator) ->  *const i64 {
+    let iter = &mut *iter;
+    iter.next().map_or(std::ptr::null_mut(), |v| &v.into_long().expect("Typed value cannot be coerced into a Long") as *const i64)
+}
+// as ref
+#[no_mangle]
+pub unsafe extern "C" fn values_iter_next_as_entid(iter: *mut TypedValueIterator) ->  *const Entid {
+    let iter = &mut *iter;
+    iter.next().map_or(std::ptr::null_mut(), |v| &v.into_entid().expect("Typed value cannot be coerced into am Entid") as *const Entid)
+}
+
+// as kw
+#[no_mangle]
+pub unsafe extern "C" fn values_iter_next_as_kw(iter: *mut TypedValueIterator) ->  *const c_char {
+    let iter = &mut *iter;
+    iter.next().map_or(std::ptr::null_mut(), |v| string_to_c_char(v.into_kw().expect("Typed value cannot be coerced into a Namespaced Keyword").to_string()))
+}
+
+//as_boolean
+#[no_mangle]
+pub unsafe extern "C" fn values_iter_next_as_boolean(iter: *mut TypedValueIterator) ->  *const bool {
+    let iter = &mut *iter;
+    iter.next().map_or(std::ptr::null_mut(), |v| &v.into_boolean().expect("Typed value cannot be coerced into a Boolean") as *const bool)
+}
+
+//as_double
+#[no_mangle]
+pub unsafe extern "C" fn values_iter_next_as_double(iter: *mut TypedValueIterator) ->  *const f64 {
+    let iter = &mut *iter;
+    iter.next().map_or(std::ptr::null_mut(), |v| &v.into_double().expect("Typed value cannot be coerced into a Double") as *const f64)
+}
+
+//as_timestamp
+#[no_mangle]
+pub unsafe extern "C" fn values_iter_next_as_timestamp(iter: *mut TypedValueIterator) ->  *const i64 {
+    let iter = &mut *iter;
+    iter.next().map_or(std::ptr::null_mut(), |v| v.into_timestamp().expect("Typed value cannot be coerced into a Timestamp") as *const i64)
+}
+
+//as_string
+#[no_mangle]
+pub unsafe extern "C" fn values_iter_next_as_string(iter: *mut TypedValueIterator) ->  *const c_char {
+    let iter = &mut *iter;
+    iter.next().map_or(std::ptr::null_mut(), |v| c_char_from_rc(v.into_string().expect("Typed value cannot be coerced into a String")))
+}
+
+//as_uuid
+#[no_mangle]
+pub unsafe extern "C" fn values_iter_next_as_uuid(iter: *mut TypedValueIterator) ->  *const c_char {
+    let iter = &mut *iter;
+    iter.next().map_or(std::ptr::null_mut(), |v| string_to_c_char(v.into_uuid_string().expect("Typed value cannot be coerced into a Uuid")))
+}
+
+#[no_mangle]
+pub unsafe extern "C" fn value_at_index(values: *mut Vec<TypedValue>, index: c_int) ->  *const TypedValue {
+    let result = &*values;
+    result.get(index as usize).expect("No value at index") as *const TypedValue
+}
+
+//as_long
+#[no_mangle]
+pub unsafe extern "C" fn value_at_index_as_long(values: *mut Vec<TypedValue>, index: c_int) ->  i64 {
+    let result = &*values;
+    let value = result.get(index as usize).expect("No value at index");
+    value.clone().into_long().expect("Typed value cannot be coerced into a Long")
+}
+// as ref
+#[no_mangle]
+pub unsafe extern "C" fn value_at_index_as_entid(values: *mut Vec<TypedValue>, index: c_int) ->  Entid {
+    let result = &*values;
+    let value = result.get(index as usize).expect("No value at index");
+    value.clone().into_entid().expect("Typed value cannot be coerced into an Entid")
+}
+
+// as kw
+#[no_mangle]
+pub unsafe extern "C" fn value_at_index_as_kw(values: *mut Vec<TypedValue>, index: c_int) ->  *const c_char {
+    let result = &*values;
+    let value = result.get(index as usize).expect("No value at index");
+    string_to_c_char(value.clone().into_kw().expect("Typed value cannot be coerced into a Namespaced Keyword").to_string())
+}
+
+//as_boolean
+#[no_mangle]
+pub unsafe extern "C" fn value_at_index_as_boolean(values: *mut Vec<TypedValue>, index: c_int) ->  bool {
+    let result = &*values;
+    let value = result.get(index as usize).expect("No value at index");
+    value.clone().into_boolean().expect("Typed value cannot be coerced into a Boolean")
+}
+
+//as_double
+#[no_mangle]
+pub unsafe extern "C" fn value_at_index_as_double(values: *mut Vec<TypedValue>, index: c_int) ->  f64 {
+    let result = &*values;
+    let value = result.get(index as usize).expect("No value at index");
+    value.clone().into_double().expect("Typed value cannot be coerced into a Double")
+}
+
+//as_timestamp
+#[no_mangle]
+pub unsafe extern "C" fn value_at_index_as_timestamp(values: *mut Vec<TypedValue>, index: c_int) ->  i64 {
+    let result = &*values;
+    let value = result.get(index as usize).expect("No value at index");
+    value.clone().into_timestamp().expect("Typed value cannot be coerced into a timestamp")
+}
+
+//as_string
+#[no_mangle]
+pub unsafe extern "C" fn value_at_index_as_string(values: *mut Vec<TypedValue>, index: c_int) ->  *mut c_char {
+    let result = &*values;
+    let value = result.get(index as usize).expect("No value at index");
+    c_char_from_rc(value.clone().into_string().expect("Typed value cannot be coerced into a String"))
+}
+
+//as_uuid
+#[no_mangle]
+pub unsafe extern "C" fn value_at_index_as_uuid(values: *mut Vec<TypedValue>, index: c_int) ->  *mut c_char {
+    let result = &*values;
+    let value = result.get(index as usize).expect("No value at index");
+    string_to_c_char(value.clone().into_uuid_string().expect("Typed value cannot be coerced into a Uuid"))
+}
+
+// TODO: q_prepare
+
+// TODO: q_explain
+
+// TODO: lookup_values_for_attribute
+
+#[no_mangle]
+pub unsafe extern "C" fn store_value_for_attribute(store: *mut Store, entid: i64, attribute: *const c_char) ->  *mut ExternResult {
+    let store = &*store;
+    let kw = kw_from_string(c_char_to_string(attribute));
+    let value = match store.lookup_value_for_attribute(entid, &kw) {
+        Ok(Some(v)) => ExternResult { ok: Box::into_raw(Box::new(v)) as *const _ as *const c_void, err: std::ptr::null() },
+        Ok(None) => ExternResult { ok: std::ptr::null(), err: std::ptr::null() },
+        Err(e) => ExternResult { ok: std::ptr::null(), err: string_to_c_char(e.description()) },
+    };
+    Box::into_raw(Box::new(value))
 }
 
 #[no_mangle]
@@ -113,7 +499,6 @@ pub unsafe extern "C" fn store_register_observer(store: *mut Store,
     attribute_set.extend(slice.iter());
     let key = c_char_to_string(key);
     let tx_observer = Arc::new(TxObserver::new(attribute_set, move |obs_key, batch| {
-        log::d(&format!("Calling observer registered for {:?}, batch: {:?}", obs_key, batch));
         let extern_reports: Vec<ExternTxReport> = batch.into_iter().map(|(tx_id, changes)| {
             let changes: Vec<Entid> = changes.into_iter().map(|i|*i).collect();
             let len = changes.len();
@@ -128,7 +513,7 @@ pub unsafe extern "C" fn store_register_observer(store: *mut Store,
             reports: extern_reports.into_boxed_slice(),
             len: len,
         };
-        callback(str_to_c_char(obs_key), &reports);
+        callback(string_to_c_char(obs_key), &reports);
     }));
     store.register_observer(key, tx_observer);
 }
@@ -137,22 +522,17 @@ pub unsafe extern "C" fn store_register_observer(store: *mut Store,
 pub unsafe extern "C" fn store_unregister_observer(store: *mut Store, key: *const c_char) {
     let store = &mut*store;
     let key = c_char_to_string(key);
-    log::d(&format!("Unregistering observer for key: {:?}", key));
     store.unregister_observer(&key);
 }
 
 #[no_mangle]
 pub unsafe extern "C" fn store_entid_for_attribute(store: *mut Store, attr: *const c_char) -> Entid {
     let store = &mut*store;
-    let mut keyword_string = c_char_to_string(attr);
-    let attr_name = keyword_string.split_off(1);
-    let parts: Vec<&str> = attr_name.split("/").collect();
-    let kw = NamespacedKeyword::new(parts[0], parts[1]);
+    let keyword_string = c_char_to_string(attr);
+    let kw = kw_from_string(keyword_string);
     let conn = store.conn();
     let current_schema = conn.current_schema();
-    let got_entid = current_schema.get_entid(&kw);
-    let entid = got_entid.unwrap();
-    entid.into()
+    current_schema.get_entid(&kw).expect("Unable to find entid for invalid attribute").into()
 }
 
 #[no_mangle]
@@ -178,3 +558,104 @@ pub unsafe extern "C" fn store_sync(store: *mut Store, user_uuid: *const c_char,
     let res = store.sync(&server_uri, &user_uuid);
     Box::into_raw(Box::new(res.into()))
 }
+
+fn assert_datom<E, V>(store: &mut Store, entid: E, attribute: String, value: V) -> *mut ExternResult
+where E: Into<KnownEntid>,
+      V: Into<TypedValue> {
+    let kw = kw_from_string(attribute);
+    let res = store.assert_datom(entid.into(), kw, value.into());
+    Box::into_raw(Box::new(res.into()))
+}
+
+#[no_mangle]
+pub unsafe extern "C" fn store_set_long_for_attribute_on_entid(store: *mut Store, entid: Entid, attribute: *const c_char, value: i64) -> *mut ExternResult {
+    let store = &mut*store;
+    let kw = kw_from_string(c_char_to_string(attribute));
+    let res = store.assert_datom(KnownEntid(entid), kw, TypedValue::Long(value));
+    Box::into_raw(Box::new(res.into()))
+}
+
+#[no_mangle]
+pub unsafe extern "C" fn store_set_entid_for_attribute_on_entid(store: *mut Store, entid: Entid, attribute: *const c_char, value: Entid) -> *mut ExternResult {
+    let store = &mut*store;
+    let kw = kw_from_string(c_char_to_string(attribute));
+    let res = store.assert_datom(KnownEntid(entid), kw, TypedValue::Ref(value));
+    Box::into_raw(Box::new(res.into()))
+}
+
+#[no_mangle]
+pub unsafe extern "C" fn store_set_kw_ref_for_attribute_on_entid(store: *mut Store, entid: Entid, attribute: *const c_char, value: *const c_char) -> *mut ExternResult {
+    let store = &mut*store;
+    let kw = kw_from_string(c_char_to_string(attribute));
+    let value = kw_from_string(c_char_to_string(value));
+    let is_valid = store.conn().current_schema().get_entid(&value);
+    if is_valid.is_none() {
+        return Box::into_raw(Box::new(ExternResult { ok: std::ptr::null_mut(), err: string_to_c_char(format!("Unknown attribute {:?}", value)) }));
+    }
+    let kw_entid = is_valid.unwrap();
+    let res = store.assert_datom(KnownEntid(entid), kw, TypedValue::Ref(kw_entid.into()));
+    Box::into_raw(Box::new(res.into()))
+}
+
+#[no_mangle]
+pub unsafe extern "C" fn store_set_boolean_for_attribute_on_entid(store: *mut Store, entid: Entid, attribute: *const c_char, value: bool) -> *mut ExternResult {
+    let store = &mut*store;
+    assert_datom(store, KnownEntid(entid), c_char_to_string(attribute), value)
+}
+
+#[no_mangle]
+pub unsafe extern "C" fn store_set_double_for_attribute_on_entid(store: *mut Store, entid: Entid, attribute: *const c_char, value: f64) -> *mut ExternResult {
+    let store = &mut*store;
+    assert_datom(store, KnownEntid(entid), c_char_to_string(attribute), value)
+}
+
+#[no_mangle]
+pub unsafe extern "C" fn store_set_timestamp_for_attribute_on_entid(store: *mut Store, entid: Entid, attribute: *const c_char, value: time_t) -> *mut ExternResult {
+    let store = &mut*store;
+    let kw = kw_from_string(c_char_to_string(attribute));
+    let res = store.assert_datom(KnownEntid(entid), kw, TypedValue::instant(value as i64));
+    Box::into_raw(Box::new(res.into()))
+}
+
+#[no_mangle]
+pub unsafe extern "C" fn store_set_string_for_attribute_on_entid(store: *mut Store, entid: Entid, attribute: *const c_char, value: *const c_char) -> *mut ExternResult {
+    let store = &mut*store;
+    assert_datom(store, KnownEntid(entid), c_char_to_string(attribute), c_char_to_string(value))
+}
+
+#[no_mangle]
+pub unsafe extern "C" fn store_set_uuid_for_attribute_on_entid(store: *mut Store, entid: Entid, attribute: *const c_char, value: *const c_char) -> *mut ExternResult {
+    let store = &mut*store;
+    let uuid = Uuid::parse_str(&c_char_to_string(value)).expect("valid uuid");
+    assert_datom(store, KnownEntid(entid), c_char_to_string(attribute), uuid)
+}
+
+#[no_mangle]
+pub unsafe extern "C" fn destroy(obj: *mut c_void) {
+    if !obj.is_null() {
+        let obj_to_release = Box::from_raw(obj);
+        println!("object to release {:?}", obj_to_release);
+    }
+}
+
+macro_rules! define_destructor (
+    ($name:ident, $t:ty) => (
+        #[no_mangle]
+        pub unsafe extern "C" fn $name(obj: *mut $t) {
+            if !obj.is_null() { let _ = Box::from_raw(obj); }
+        }
+    )
+);
+define_destructor!(query_builder_destroy, QueryBuilder);
+
+define_destructor!(store_destroy, Store);
+
+define_destructor!(typed_value_destroy, TypedValue);
+
+define_destructor!(typed_value_list_destroy, Vec<TypedValue>);
+
+define_destructor!(typed_value_list_iter_destroy, TypedValueIterator);
+
+define_destructor!(typed_value_result_set_destroy, Vec<Vec<TypedValue>>);
+
+define_destructor!(typed_value_result_set_iter_destroy, TypedValueListIterator);

ffi/src/utils.rs

@@ -9,27 +9,40 @@
 // specific language governing permissions and limitations under the License.
 
 pub mod strings {
-    use std::os::raw::c_char;
+    use std;
     use std::ffi::{
         CString,
         CStr
     };
+    use std::os::raw::c_char;
+    use std::rc::Rc;
+
+    use mentat::{
+        NamespacedKeyword,
+    };
 
     pub fn c_char_to_string(cchar: *const c_char) -> String {
         let c_str = unsafe { CStr::from_ptr(cchar) };
-        let r_str = match c_str.to_str() {
-            Err(_) => "",
-            Ok(string) => string,
-        };
+        let r_str = c_str.to_str().unwrap_or("");
         r_str.to_string()
     }
 
-    pub fn string_to_c_char(r_string: String) -> *mut c_char {
-        CString::new(r_string).unwrap().into_raw()
+    pub fn string_to_c_char<T>(r_string: T) -> *mut c_char where T: Into<String> {
+        CString::new(r_string.into()).unwrap().into_raw()
     }
 
-    pub fn str_to_c_char(r_string: &str) -> *mut c_char {
-        string_to_c_char(r_string.to_string())
+    pub fn kw_from_string(mut keyword_string: String) -> NamespacedKeyword {
+        let attr_name = keyword_string.split_off(1);
+        let parts: Vec<&str> = attr_name.split("/").collect();
+        NamespacedKeyword::new(parts[0], parts[1])
+    }
+
+    pub fn c_char_from_rc(rc_string: Rc<String>) -> *mut c_char {
+        if let Some(str_ptr) = unsafe { Rc::into_raw(rc_string).as_ref() } {
+            string_to_c_char(str_ptr.clone())
+        } else {
+            std::ptr::null_mut()
+        }
     }
 }
 
@@ -55,6 +68,6 @@ pub mod log {
         let message = message.as_ptr();
         let tag = CString::new("Mentat").unwrap();
         let tag = tag.as_ptr();
-        unsafe { android::__android_log_write(android::ANDROID_LOG_DEBUG, tag, message) };
+        unsafe { android::__android_log_write(android::LogLevel::Debug as i32, tag, message) };
     }
 }

src/conn.rs

@@ -81,6 +81,7 @@ use mentat_tolstoy::Syncer;
 use uuid::Uuid;
 
 use entity_builder::{
+    BuildTerms,
     InProgressBuilder,
 };
 
@@ -578,6 +579,10 @@ impl Store {
     pub fn unregister_observer(&mut self, key: &String) {
         self.conn.unregister_observer(key);
     }
+
+    pub fn assert_datom<T>(&mut self, entid: T, attribute: NamespacedKeyword, value: TypedValue) -> Result<()> where T: Into<KnownEntid> {
+        self.conn.assert_datom(&mut self.sqlite, entid, attribute, value)
+    }
 }
 
 impl Queryable for Store {
@@ -865,6 +870,18 @@ impl Conn {
     pub fn unregister_observer(&mut self, key: &String) {
         self.tx_observer_service.lock().unwrap().deregister(key);
     }
+
+    // TODO: expose the entity builder over FFI and remove the need for this function entirely
+    // It's really only here in order to keep the FFI layer as thin as possible.
+    // Once the entity builder is exposed, we can perform all of these functions over FFI from the client.
+    pub fn assert_datom<T>(&mut self, sqlite: &mut rusqlite::Connection, entid: T, attribute: NamespacedKeyword, value: TypedValue) -> Result<()> where T: Into<KnownEntid> {
+        let in_progress = self.begin_transaction(sqlite)?;
+        let mut builder = in_progress.builder().describe(entid.into());
+        builder.add_kw(&attribute, value)?;
+        builder.commit()
+               .map_err(|e| e.into())
+               .and(Ok(()))
+    }
 }
 
 #[cfg(test)]

src/lib.rs

@@ -97,6 +97,7 @@ pub mod vocabulary;
 pub mod conn;
 pub mod query;
 pub mod entity_builder;
+pub mod query_builder;
 
 pub use query::{
     IntoResult,
@@ -111,6 +112,10 @@ pub use query::{
     q_once,
 };
 
+pub use query_builder::{
+    QueryBuilder,
+};
+
 pub use conn::{
     CacheAction,
     CacheDirection,

src/query_builder.rs

@@ -0,0 +1,389 @@
+// Copyright 2018 Mozilla
+//
+// Licensed under the Apache License, Version 2.0 (the "License"); you may not use
+// this file except in compliance with the License. You may obtain a copy of the
+// License at http://www.apache.org/licenses/LICENSE-2.0
+// Unless required by applicable law or agreed to in writing, software distributed
+// under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
+// CONDITIONS OF ANY KIND, either express or implied. See the License for the
+// specific language governing permissions and limitations under the License.
+
+#![macro_use]
+use std::collections::{
+    BTreeMap,
+};
+
+use mentat_core::{
+    Entid,
+    NamespacedKeyword,
+    TypedValue,
+    ValueType,
+};
+
+use ::{
+    HasSchema,
+    Queryable,
+    QueryInputs,
+    QueryOutput,
+    Store,
+    Variable,
+};
+
+use errors::{
+    ErrorKind,
+    Result,
+};
+
+pub struct QueryBuilder<'a> {
+    sql: String,
+    values: BTreeMap<Variable, TypedValue>,
+    types: BTreeMap<Variable, ValueType>,
+    store: &'a mut Store,
+}
+
+impl<'a> QueryBuilder<'a> {
+    pub fn new<T>(store: &'a mut Store, sql: T) -> QueryBuilder where T: Into<String> {
+        QueryBuilder { sql: sql.into(), values: BTreeMap::new(), types: BTreeMap::new(), store }
+    }
+
+    pub fn bind_value<T>(&mut self, var: &str, value: T) -> &mut Self where T: Into<TypedValue> {
+        self.values.insert(Variable::from_valid_name(var), value.into());
+        self
+    }
+
+    pub fn bind_ref_from_kw(&mut self, var: &str, value: NamespacedKeyword) -> Result<&mut Self> {
+        let entid = self.store.conn().current_schema().get_entid(&value).ok_or(ErrorKind::UnknownAttribute(value.to_string()))?;
+        self.values.insert(Variable::from_valid_name(var), TypedValue::Ref(entid.into()));
+        Ok(self)
+    }
+
+    pub fn bind_ref<T>(&mut self, var: &str, value: T) -> &mut Self where T: Into<Entid> {
+       self.values.insert(Variable::from_valid_name(var), TypedValue::Ref(value.into()));
+       self
+    }
+
+    pub fn bind_long(&mut self, var: &str, value: i64) -> &mut Self {
+       self.values.insert(Variable::from_valid_name(var), TypedValue::Long(value));
+       self
+    }
+
+    pub fn bind_instant(&mut self, var: &str, value: i64) -> &mut Self {
+       self.values.insert(Variable::from_valid_name(var), TypedValue::instant(value));
+       self
+    }
+
+    pub fn bind_type(&mut self, var: &str, value_type: ValueType) -> &mut Self {
+        self.types.insert(Variable::from_valid_name(var), value_type);
+        self
+    }
+
+    pub fn execute(&mut self) -> Result<QueryOutput> {
+        let values = ::std::mem::replace(&mut self.values, Default::default());
+        let types = ::std::mem::replace(&mut self.types, Default::default());
+        let query_inputs = QueryInputs::new(types, values)?;
+        let read = self.store.begin_read()?;
+        read.q_once(&self.sql, query_inputs)
+    }
+
+    pub fn execute_scalar(&mut self) -> Result<Option<TypedValue>> {
+        let results = self.execute()?;
+        results.into_scalar().map_err(|e| e.into())
+    }
+
+    pub fn execute_coll(&mut self) -> Result<Vec<TypedValue>> {
+        let results = self.execute()?;
+        results.into_coll().map_err(|e| e.into())
+    }
+
+    pub fn execute_tuple(&mut self) -> Result<Option<Vec<TypedValue>>> {
+        let results = self.execute()?;
+        results.into_tuple().map_err(|e| e.into())
+    }
+
+    pub fn execute_rel(&mut self) -> Result<Vec<Vec<TypedValue>>> {
+        let results = self.execute()?;
+        results.into_rel().map_err(|e| e.into())
+    }
+}
+
+#[cfg(test)]
+mod test {
+    use super::{
+        QueryBuilder,
+        TypedValue,
+        Store,
+    };
+
+    #[test]
+    fn test_scalar_query() {
+        let mut store = Store::open("").expect("store connection");
+        store.transact(r#"[
+            [:db/add "s" :db/ident :foo/boolean]
+            [:db/add "s" :db/valueType :db.type/boolean]
+            [:db/add "s" :db/cardinality :db.cardinality/one]
+        ]"#).expect("successful transaction");
+
+        let report = store.transact(r#"[
+            [:db/add "u" :foo/boolean true]
+            [:db/add "p" :foo/boolean false]
+        ]"#).expect("successful transaction");
+
+        let yes = report.tempids.get("u").expect("found it").clone();
+
+        let entid = QueryBuilder::new(&mut store, r#"[:find ?x .
+                                                      :in ?v
+                                                      :where [?x :foo/boolean ?v]]"#)
+                              .bind_value("?v", true)
+                              .execute_scalar().expect("ScalarResult")
+                              .map_or(None, |t| t.into_entid());
+        assert_eq!(entid, Some(yes));
+    }
+
+    #[test]
+    fn test_coll_query() {
+        let mut store = Store::open("").expect("store connection");
+        store.transact(r#"[
+            [:db/add "s" :db/ident :foo/boolean]
+            [:db/add "s" :db/valueType :db.type/boolean]
+            [:db/add "s" :db/cardinality :db.cardinality/one]
+            [:db/add "t" :db/ident :foo/long]
+            [:db/add "t" :db/valueType :db.type/long]
+            [:db/add "t" :db/cardinality :db.cardinality/one]
+        ]"#).expect("successful transaction");
+
+        let report = store.transact(r#"[
+            [:db/add "l" :foo/boolean true]
+            [:db/add "l" :foo/long 25]
+            [:db/add "m" :foo/boolean false]
+            [:db/add "m" :foo/long 26]
+            [:db/add "n" :foo/boolean true]
+            [:db/add "n" :foo/long 27]
+            [:db/add "p" :foo/boolean false]
+            [:db/add "p" :foo/long 24]
+            [:db/add "u" :foo/boolean true]
+            [:db/add "u" :foo/long 23]
+        ]"#).expect("successful transaction");
+
+        let u_yes = report.tempids.get("u").expect("found it").clone();
+        let l_yes = report.tempids.get("l").expect("found it").clone();
+        let n_yes = report.tempids.get("n").expect("found it").clone();
+
+        let entids: Vec<i64> = QueryBuilder::new(&mut store, r#"[:find [?x ...]
+                                                                 :in ?v
+                                                                 :where [?x :foo/boolean ?v]]"#)
+                              .bind_value("?v", true)
+                              .execute_coll().expect("CollResult")
+                              .into_iter()
+                              .map(|v| v.into_entid().expect("val"))
+                              .collect();
+
+        assert_eq!(entids, vec![l_yes, n_yes, u_yes]);
+    }
+
+    #[test]
+    fn test_coll_query_by_row() {
+        let mut store = Store::open("").expect("store connection");
+        store.transact(r#"[
+            [:db/add "s" :db/ident :foo/boolean]
+            [:db/add "s" :db/valueType :db.type/boolean]
+            [:db/add "s" :db/cardinality :db.cardinality/one]
+            [:db/add "t" :db/ident :foo/long]
+            [:db/add "t" :db/valueType :db.type/long]
+            [:db/add "t" :db/cardinality :db.cardinality/one]
+        ]"#).expect("successful transaction");
+
+        let report = store.transact(r#"[
+            [:db/add "l" :foo/boolean true]
+            [:db/add "l" :foo/long 25]
+            [:db/add "m" :foo/boolean false]
+            [:db/add "m" :foo/long 26]
+            [:db/add "n" :foo/boolean true]
+            [:db/add "n" :foo/long 27]
+            [:db/add "p" :foo/boolean false]
+            [:db/add "p" :foo/long 24]
+            [:db/add "u" :foo/boolean true]
+            [:db/add "u" :foo/long 23]
+        ]"#).expect("successful transaction");
+
+        let n_yes = report.tempids.get("n").expect("found it").clone();
+
+        let results = QueryBuilder::new(&mut store, r#"[:find [?x ...]
+                                                        :in ?v
+                                                        :where [?x :foo/boolean ?v]]"#)
+                              .bind_value("?v", true)
+                              .execute_coll().expect("CollResult");
+        let entid = results.get(1).map_or(None, |t| t.to_owned().into_entid()).expect("entid");
+
+        assert_eq!(entid, n_yes);
+    }
+
+    #[test]
+    fn test_tuple_query_result_by_column() {
+        let mut store = Store::open("").expect("store connection");
+        store.transact(r#"[
+            [:db/add "s" :db/ident :foo/boolean]
+            [:db/add "s" :db/valueType :db.type/boolean]
+            [:db/add "s" :db/cardinality :db.cardinality/one]
+            [:db/add "t" :db/ident :foo/long]
+            [:db/add "t" :db/valueType :db.type/long]
+            [:db/add "t" :db/cardinality :db.cardinality/one]
+        ]"#).expect("successful transaction");
+
+        let report = store.transact(r#"[
+            [:db/add "l" :foo/boolean true]
+            [:db/add "l" :foo/long 25]
+            [:db/add "m" :foo/boolean false]
+            [:db/add "m" :foo/long 26]
+            [:db/add "n" :foo/boolean true]
+            [:db/add "n" :foo/long 27]
+            [:db/add "p" :foo/boolean false]
+            [:db/add "p" :foo/long 24]
+            [:db/add "u" :foo/boolean true]
+            [:db/add "u" :foo/long 23]
+        ]"#).expect("successful transaction");
+
+        let n_yes = report.tempids.get("n").expect("found it").clone();
+
+        let results = QueryBuilder::new(&mut store, r#"[:find [?x, ?i]
+                                                        :in ?v ?i
+                                                        :where [?x :foo/boolean ?v]
+                                                               [?x :foo/long ?i]]"#)
+                              .bind_value("?v", true)
+                              .bind_long("?i", 27)
+                              .execute_tuple().expect("TupleResult").expect("Vec<TypedValue>");
+        let entid = results.get(0).map_or(None, |t| t.to_owned().into_entid()).expect("entid");
+        let long_val = results.get(1).map_or(None, |t| t.to_owned().into_long()).expect("long");
+
+        assert_eq!(entid, n_yes);
+        assert_eq!(long_val, 27);
+    }
+
+    #[test]
+    fn test_tuple_query_result_by_iter() {
+        let mut store = Store::open("").expect("store connection");
+        store.transact(r#"[
+            [:db/add "s" :db/ident :foo/boolean]
+            [:db/add "s" :db/valueType :db.type/boolean]
+            [:db/add "s" :db/cardinality :db.cardinality/one]
+            [:db/add "t" :db/ident :foo/long]
+            [:db/add "t" :db/valueType :db.type/long]
+            [:db/add "t" :db/cardinality :db.cardinality/one]
+        ]"#).expect("successful transaction");
+
+        let report = store.transact(r#"[
+            [:db/add "l" :foo/boolean true]
+            [:db/add "l" :foo/long 25]
+            [:db/add "m" :foo/boolean false]
+            [:db/add "m" :foo/long 26]
+            [:db/add "n" :foo/boolean true]
+            [:db/add "n" :foo/long 27]
+            [:db/add "p" :foo/boolean false]
+            [:db/add "p" :foo/long 24]
+            [:db/add "u" :foo/boolean true]
+            [:db/add "u" :foo/long 23]
+        ]"#).expect("successful transaction");
+
+        let n_yes = report.tempids.get("n").expect("found it").clone();
+
+        let results: Vec<TypedValue> = QueryBuilder::new(&mut store, r#"[:find [?x, ?i]
+                                                                         :in ?v ?i
+                                                                         :where [?x :foo/boolean ?v]
+                                                                                [?x :foo/long ?i]]"#)
+                              .bind_value("?v", true)
+                              .bind_long("?i", 27)
+                              .execute_tuple().expect("TupleResult").unwrap_or(vec![]);
+        let entid = TypedValue::Ref(n_yes.clone());
+        let long_val = TypedValue::Long(27);
+
+        assert_eq!(results, vec![entid, long_val]);
+    }
+
+    #[test]
+    fn test_rel_query_result() {
+        let mut store = Store::open("").expect("store connection");
+        store.transact(r#"[
+            [:db/add "s" :db/ident :foo/boolean]
+            [:db/add "s" :db/valueType :db.type/boolean]
+            [:db/add "s" :db/cardinality :db.cardinality/one]
+            [:db/add "t" :db/ident :foo/long]
+            [:db/add "t" :db/valueType :db.type/long]
+            [:db/add "t" :db/cardinality :db.cardinality/one]
+        ]"#).expect("successful transaction");
+
+        let report = store.transact(r#"[
+            [:db/add "l" :foo/boolean true]
+            [:db/add "l" :foo/long 25]
+            [:db/add "m" :foo/boolean false]
+            [:db/add "m" :foo/long 26]
+            [:db/add "n" :foo/boolean true]
+            [:db/add "n" :foo/long 27]
+        ]"#).expect("successful transaction");
+
+        let l_yes = report.tempids.get("l").expect("found it").clone();
+        let m_yes = report.tempids.get("m").expect("found it").clone();
+        let n_yes = report.tempids.get("n").expect("found it").clone();
+
+        #[derive(Debug, PartialEq)]
+        struct Res {
+            entid: i64,
+            boolean: bool,
+            long_val: i64,
+        };
+
+        let mut results: Vec<Res> = QueryBuilder::new(&mut store, r#"[:find ?x ?v ?i
+                                                                      :where [?x :foo/boolean ?v]
+                                                                             [?x :foo/long ?i]]"#)
+                              .execute_rel().expect("RelResult")
+                              .into_iter()
+                              .map(|row| {
+                                  Res {
+                                      entid: row.get(0).map_or(None, |t| t.to_owned().into_entid()).expect("entid"),
+                                      boolean: row.get(1).map_or(None, |t| t.to_owned().into_boolean()).expect("boolean"),
+                                      long_val: row.get(2).map_or(None, |t| t.to_owned().into_long()).expect("long"),
+                                  }
+                              })
+                              .collect();
+
+        let res1 = results.pop().expect("res");
+        assert_eq!(res1, Res { entid: n_yes, boolean: true, long_val: 27 });
+        let res2 = results.pop().expect("res");
+        assert_eq!(res2, Res { entid: m_yes, boolean: false, long_val: 26 });
+        let res3 = results.pop().expect("res");
+        assert_eq!(res3, Res { entid: l_yes, boolean: true, long_val: 25 });
+        assert_eq!(results.pop(), None);
+    }
+
+    #[test]
+    fn test_bind_ref() {
+        let mut store = Store::open("").expect("store connection");
+        store.transact(r#"[
+            [:db/add "s" :db/ident :foo/boolean]
+            [:db/add "s" :db/valueType :db.type/boolean]
+            [:db/add "s" :db/cardinality :db.cardinality/one]
+            [:db/add "t" :db/ident :foo/long]
+            [:db/add "t" :db/valueType :db.type/long]
+            [:db/add "t" :db/cardinality :db.cardinality/one]
+        ]"#).expect("successful transaction");
+
+        let report = store.transact(r#"[
+            [:db/add "l" :foo/boolean true]
+            [:db/add "l" :foo/long 25]
+            [:db/add "m" :foo/boolean false]
+            [:db/add "m" :foo/long 26]
+            [:db/add "n" :foo/boolean true]
+            [:db/add "n" :foo/long 27]
+        ]"#).expect("successful transaction");
+
+        let l_yes = report.tempids.get("l").expect("found it").clone();
+
+        let results = QueryBuilder::new(&mut store, r#"[:find [?v ?i]
+                                                        :in ?x
+                                                        :where [?x :foo/boolean ?v]
+                                                               [?x :foo/long ?i]]"#)
+                              .bind_ref("?x", l_yes)
+                              .execute_tuple().expect("TupleResult")
+                              .unwrap_or(vec![]);
+        assert_eq!(results.get(0).map_or(None, |t| t.to_owned().into_boolean()).expect("boolean"), true);
+        assert_eq!(results.get(1).map_or(None, |t| t.to_owned().into_long()).expect("long"), 25);
+    }
+}