implemented prepared statement for postgres and sqlite

backends/sqlite/src/sqlite_statement.cpp

@@ -0,0 +1,52 @@
+#include "sqlite_statement.hpp"
+#include "sqlite_prepared_result_reader.hpp"
+#include "sqlite_error.hpp"
+
+namespace matador::backends::sqlite {
+sqlite_statement::sqlite_statement(sqlite3 *db, sqlite3_stmt *stmt, const sql::query_context &query)
+: statement_impl(query)
+, db_(db)
+, stmt_(stmt)
+, binder_(db, stmt)
+{}
+
+sqlite_statement::~sqlite_statement()
+{
+  sqlite3_finalize(stmt_);
+}
+
+size_t sqlite_statement::execute()
+{
+  // get next row
+  int ret = sqlite3_reset(stmt_);
+  throw_sqlite_error(ret, db_, "sqlite3_reset");
+  if (ret = sqlite3_step(stmt_); ret != SQLITE_DONE) {
+    throw_sqlite_error(ret, db_, "sqlite3_step");
+  }
+
+  return sqlite3_changes(db_);
+}
+
+std::unique_ptr<sql::query_result_impl> sqlite_statement::fetch()
+{
+  int ret = sqlite3_reset(stmt_);
+  throw_sqlite_error(ret, db_, "sqlite3_reset");
+
+  auto reader = std::make_unique<sqlite_prepared_result_reader>(db_, stmt_);
+  return std::move(std::make_unique<sql::query_result_impl>(std::move(reader), query_.prototype));
+}
+
+void sqlite_statement::reset()
+{
+  if (stmt_) {
+    sqlite3_reset(stmt_);
+    sqlite3_clear_bindings(stmt_);
+  }
+}
+
+sql::parameter_binder& sqlite_statement::binder()
+{
+  return binder_;
+}
+
+}