Optimize blob passing

.gitignore

@@ -1,5 +1,7 @@
 .idea/*
 
+/artifacts
+.repl_history
 *.sqlite3
 Cargo.lock
 target

src/connection.rs

@@ -28,7 +28,7 @@ impl Connection {
         unsafe {
             let path = path.as_ref();
             let path = path.to_string_lossy().into_owned();
-            let result = ffi::sqlite3_open_v2(path, flags.0, String::new());
+            let result = ffi::sqlite3_open_v2(&path, flags.0, &String::new());
 
             match result.ret_code {
                 ffi::SQLITE_OK => {}

src/sqlite3_connector/import_functions.rs

@@ -38,7 +38,7 @@ extern "C" {
        const char *zVfs        /* Name of VFS module to use */
       );
     */
-    pub fn sqlite3_open_v2(filename: String, flags: i32, vfs: String) -> DBOpenDescriptor;
+    pub fn sqlite3_open_v2(filename: &str, flags: i32, vfs: &str) -> DBOpenDescriptor;
 
     // SQLITE_API int sqlite3_close(sqlite3*);
     pub fn sqlite3_close(db_handle: u32) -> i32;
@@ -52,7 +52,7 @@ extern "C" {
        const char **pzTail     /* OUT: Pointer to unused portion of zSql */
      );
     */
-    pub fn sqlite3_prepare_v2(db_handle: u32, sql: String) -> DBPrepareDescriptor;
+    pub fn sqlite3_prepare_v2(db_handle: u32, sql: &str) -> DBPrepareDescriptor;
 
     /*
      SQLITE_API int sqlite3_exec(
@@ -65,7 +65,7 @@ extern "C" {
     */
     pub fn sqlite3_exec(
         db_handle: u32,
-        sql: String,
+        sql: &str,
         callback_id: i32,
         callback_arg: i32,
     ) -> DBExecDescriptor;
@@ -101,7 +101,7 @@ extern "C" {
     pub fn sqlite3_reset(stmt_handle: u32) -> i32;
 
     // SQLITE_API int sqlite3_bind_blob(sqlite3_stmt*, int, const void*, int n, void(*)(void*));
-    pub fn sqlite3_bind_blob(stmt_handle: u32, pos: i32, blob: Vec<u8>, xDel: i32) -> i32;
+    pub fn sqlite3_bind_blob(stmt_handle: u32, pos: i32, blob: &Vec<u8>, xDel: i32) -> i32;
 
     // SQLITE_API int sqlite3_bind_double(sqlite3_stmt*, int, double);
     pub fn sqlite3_bind_double(stmt_handle: u32, pos: i32, value: f64) -> i32;
@@ -113,7 +113,7 @@ extern "C" {
     pub fn sqlite3_bind_null(stmt_handle: u32, pos: i32) -> i32;
 
     // SQLITE_API int sqlite3_bind_text(sqlite3_stmt*,int,const char*,int,void(*)(void*));
-    pub fn sqlite3_bind_text(stmt_handle: u32, pos: i32, text: String, xDel: i32) -> i32;
+    pub fn sqlite3_bind_text(stmt_handle: u32, pos: i32, text: &str, xDel: i32) -> i32;
 
     // SQLITE_API int sqlite3_column_count(sqlite3_stmt *pStmt)
     pub fn sqlite3_column_count(stmt_handle: u32) -> i32;

src/statement.rs

@@ -128,16 +128,16 @@ impl<'l> Drop for Statement {
 impl Bindable for &Value {
     fn bind(self, statement: &mut Statement, i: usize) -> Result<()> {
         match self {
-            &Value::Binary(ref value) => (value as &[u8]).bind(statement, i),
+            Value::Binary(value) => value.bind(statement, i),
             &Value::Float(value) => value.bind(statement, i),
             &Value::Integer(value) => value.bind(statement, i),
-            &Value::String(ref value) => (value as &str).bind(statement, i),
+            Value::String(value) => value.as_str().bind(statement, i),
-            &Value::Null => ().bind(statement, i),
+            Value::Null => ().bind(statement, i),
         }
     }
 }
 
-impl Bindable for &[u8] {
+impl Bindable for &Vec<u8> {
     #[inline]
     fn bind(self, statement: &mut Statement, i: usize) -> Result<()> {
         debug_assert!(i > 0, "the indexing starts from 1");