backends/postgres/include/postgres_connection.hpp

@@ -45,8 +45,6 @@ public:
 private:
   [[nodiscard]] static std::string generate_statement_name(const sql::query_context &query) ;
 
-  utils::result<sql::execute_result, utils::error> execute(const std::string &stmt) const;
-
 private:
   PGconn *conn_{nullptr};
 

backends/postgres/src/postgres_connection.cpp

@@ -129,20 +129,6 @@ std::string postgres_connection::generate_statement_name(const sql::query_contex
   return name.str();
 }
 
-utils::result<sql::execute_result, utils::error> postgres_connection::execute(const std::string& stmt) const {
-    PGresult *res = PQexec(conn_, stmt.c_str());
-
-    if (const auto status = PQresultStatus(res); status != PGRES_COMMAND_OK && status != PGRES_TUPLES_OK) {
-        return utils::failure(make_error(sql::error_code::FAILURE, res, conn_, "Failed to execute", stmt));
-    }
-
-    const size_t affected_rows = utils::to<size_t>(PQcmdTuples(res));
-
-    PQclear(res);
-
-    return utils::ok(sql::execute_result{affected_rows});
-}
-
 utils::result<std::unique_ptr<sql::statement_impl>, utils::error> postgres_connection::prepare(const sql::query_context &context) {
   auto statement_name = generate_statement_name(context);
 
@@ -157,7 +143,9 @@ utils::result<std::unique_ptr<sql::statement_impl>, utils::error> postgres_conne
 }
 
 utils::result<sql::execute_result, utils::error> postgres_connection::execute(const sql::query_context &context) {
-  return execute(context.sql);
+  if (context.command == sql::sql_command::Insert) {
+    // handle insert command with the primary key generator strategy
+  }
   PGresult *res = PQexec(conn_, context.sql.c_str());
 
   if (const auto status = PQresultStatus(res); status != PGRES_COMMAND_OK && status != PGRES_TUPLES_OK) {
@@ -311,17 +299,7 @@ utils::result<bool, utils::error> postgres_connection::exists(const std::string
 }
 
 utils::result<bool, utils::error> postgres_connection::sequence_exists(const std::string& schema_name, const std::string& sequence_name) {
-    const std::string sql{"SELECT to_regclass('" + schema_name + "." + sequence_name + "')"};
+  return utils::ok(false);
-    PGresult* res = PQexec(conn_, sql.c_str());
-
-    if (PQresultStatus(res) != PGRES_TUPLES_OK) {
-        return utils::failure(make_error(sql::error_code::SEQUENCE_EXISTS_FAILED, res, conn_, "Failed check if sequence exists", sql));
-    }
-
-    const bool exists = PQgetisnull(res, 0, 0) ? false : true;
-    PQclear(res);
-
-    return utils::ok(exists);
 }
 
 std::string postgres_connection::to_escaped_string(const utils::blob_type_t &value) const {

include/matador/query/abstract_pk_generator.hpp

@@ -15,7 +15,6 @@ class abstract_pk_generator {
 public:
   virtual ~abstract_pk_generator() = default;
   virtual utils::result<int64_t, utils::error> next_id(const sql::executor& exec) = 0;
-  virtual utils::result<int64_t, utils::error> current_id(const sql::executor& exec) = 0;
 
   [[nodiscard]] utils::generator_type type() const;
 

include/matador/query/intermediates/query_select_intermediate.hpp

@@ -18,7 +18,6 @@ public:
   explicit query_select_intermediate(const std::vector<table_column>& columns);
 
   fetchable_query nextval(const std::string& sequence_name);
-  fetchable_query currval(const std::string& sequence_name);
 
   template<typename... Tables>
   query_from_intermediate from(const Tables&... tables) {

include/matador/query/internal/query_parts.hpp

@@ -139,19 +139,6 @@ private:
   std::string sequence_name_;
 };
 
-class query_select_currval_part final : public query_part {
-public:
-  explicit query_select_currval_part(std::string sequence_name);
-
-  [[nodiscard]] const std::string& sequence_name() const;
-
-private:
-  void accept(query_part_visitor &visitor) override;
-
-private:
-  std::string sequence_name_;
-};
-
 
 /**
  * Represents the SQL FROM part

include/matador/query/manual_pk_generator.hpp

@@ -8,7 +8,6 @@ class manual_pk_generator : public abstract_pk_generator {
 public:
     manual_pk_generator();
     [[nodiscard]] utils::result<int64_t, utils::error> next_id(const sql::executor& exec) override;
-    [[nodiscard]] utils::result<int64_t, utils::error> current_id(const sql::executor& exec) override;
 };
 }
 #endif //MATADOR_MANUAL_PK_GENERATOR_HPP

include/matador/query/query_builder.hpp

@@ -46,7 +46,6 @@ protected:
 
   void visit(internal::query_select_part &part) override;
   void visit(internal::query_select_nextval_part &part) override;
-  void visit(internal::query_select_currval_part &part) override;
   void visit(internal::query_from_part &part) override;
   void visit(internal::query_join_table_part &part) override;
   void visit(internal::query_join_query_part &part) override;

include/matador/query/query_part_visitor.hpp

@@ -18,7 +18,6 @@ class query_add_primary_key_constraint_part;
 // Select
 class query_select_part;
 class query_select_nextval_part;
-class query_select_currval_part;
 class query_from_part;
 class query_join_table_part;
 class query_join_query_part;
@@ -77,7 +76,6 @@ public:
 
   virtual void visit(internal::query_select_part &part) = 0;
   virtual void visit(internal::query_select_nextval_part &part) = 0;
-  virtual void visit(internal::query_select_currval_part &part) = 0;
   virtual void visit(internal::query_from_part &part) = 0;
   virtual void visit(internal::query_join_table_part &part) = 0;
   virtual void visit(internal::query_join_query_part &part) = 0;

include/matador/query/schema.hpp

@@ -243,14 +243,14 @@ public:
   iterator find() { return basic_schema::find(typeid(Type)); }
 
   template<typename Type>
-  [[nodiscard]] const_iterator find() const { return basic_schema::find(typeid(Type)); }
+  const_iterator find() const { return basic_schema::find(typeid(Type)); }
 
   template < typename Type >
   [[nodiscard]] bool contains() const {
     return basic_schema::contains(std::type_index(typeid(Type)));
   }
 
-  [[nodiscard]] const object::repository &repo() const { return repo_; }
+  const object::repository &repo() const { return repo_; }
   object::repository &repo() { return repo_; }
 
   void dump(std::ostream &os) const;

include/matador/query/sequence_pk_generator.hpp

@@ -12,11 +12,9 @@ public:
     explicit sequence_pk_generator(const std::string& sequence_name);
 
     utils::result<int64_t, utils::error> next_id(const sql::executor& exec) override;
-    utils::result<int64_t, utils::error> current_id(const sql::executor& exec) override;
 
 private:
-    fetchable_query next_id_query_;
+    fetchable_query query_;
-    fetchable_query current_id_query_;
 };
 }
 #endif //MATADOR_SEQUENCE_PK_GENERATOR_H

include/matador/query/table_pk_generator.hpp

@@ -2,18 +2,15 @@
 #define MATADOR_TABLE_PK_GENERATOR_HPP
 
 #include "matador/query/abstract_pk_generator.hpp"
-#include "matador/query/intermediates/fetchable_query.hpp"
 
 namespace matador::query {
 class table_pk_generator : public abstract_pk_generator {
 public:
     table_pk_generator(const std::string& table_name, const std::string& sequence_name);
     [[nodiscard]] utils::result<int64_t, utils::error> next_id(const sql::executor& exec) override;
-    [[nodiscard]] utils::result<int64_t, utils::error> current_id(const sql::executor& exec) override;
 
 private:
-    fetchable_query next_id_query_;
+    std::string table_name;
-    fetchable_query current_id_query_;
 };
 }
 #endif //MATADOR_TABLE_PK_GENERATOR_HPP

include/matador/sql/dialect.hpp

@@ -138,7 +138,6 @@ public:
   [[nodiscard]] const std::string& commit() const;
   [[nodiscard]] const std::string& constraint() const;
   [[nodiscard]] const std::string& create() const;
-  [[nodiscard]] const std::string& currval() const;
   [[nodiscard]] const std::string& desc() const;
   [[nodiscard]] const std::string& distinct() const;
   [[nodiscard]] const std::string& drop() const;
@@ -213,7 +212,6 @@ private:
     {dialect_token::Commit,      "COMMIT TRANSACTION"},
     {dialect_token::Constraint,  "CONSTRAINT"},
     {dialect_token::Create,      "CREATE"},
-    {dialect_token::CurrVal,     "CURRVAL"},
     {dialect_token::Desc,        "DESC"},
     {dialect_token::Distinct,    "DISTINCT"},
     {dialect_token::Drop,        "DROP"},

include/matador/sql/dialect_token.hpp

@@ -21,7 +21,6 @@ enum class dialect_token : uint8_t {
   Commit,
   Constraint,
   Create,
-  CurrVal,
   Database,
   Desc,
   Distinct,

include/matador/sql/error_code.hpp

@@ -18,7 +18,6 @@ enum class error_code : uint8_t {
   DESCRIBE_FAILED,
   TABLE_EXISTS_FAILED,
   RETRIEVE_DATA_FAILED,
-  SEQUENCE_EXISTS_FAILED,
   RESET_FAILED,
   OPEN_ERROR,
   CLOSE_ERROR,

source/orm/query/intermediates/query_select_intermediate.cpp

@@ -17,12 +17,6 @@ fetchable_query query_select_intermediate::nextval(const std::string& sequence_n
   return {context_};
 }
 
-fetchable_query query_select_intermediate::currval(const std::string& sequence_name) {
-    context_->parts.pop_back();
-    context_->parts.push_back(std::make_unique<internal::query_select_currval_part>(sequence_name));
-    return {context_};
-}
-
 query_from_intermediate query_select_intermediate::from(const std::vector<table>& tables) {
   context_->parts.push_back(std::make_unique<internal::query_from_part>(tables));
   for (const auto& tab : tables) {

source/orm/query/internal/query_parts.cpp

@@ -147,19 +147,6 @@ void query_select_nextval_part::accept(query_part_visitor& visitor) {
   visitor.visit(*this);
 }
 
-query_select_currval_part::query_select_currval_part(std::string sequence_name)
-: query_part(sql::dialect_token::NextVal)
-, sequence_name_(std::move(sequence_name)){
-}
-
-const std::string& query_select_currval_part::sequence_name() const {
-  return sequence_name_;
-}
-
-void query_select_currval_part::accept(query_part_visitor& visitor) {
-  visitor.visit(*this);
-}
-
 query_from_part::query_from_part(std::vector<table> tables)
 : query_part(sql::dialect_token::From)
 , tables_(std::move(tables)) {

source/orm/query/manual_pk_generator.cpp

@@ -10,8 +10,4 @@ manual_pk_generator::manual_pk_generator()
 utils::result<int64_t, utils::error> manual_pk_generator::next_id(const sql::executor &/*exec*/) {
   return utils::failure(utils::error(sql::error_code::FAILURE, "Manual PK generator not implemented"));
 }
-
-utils::result<int64_t, utils::error> manual_pk_generator::current_id(const sql::executor& exec) {
-  return utils::failure(utils::error(sql::error_code::FAILURE, "Manual PK generator not implemented"));
-}
 }

source/orm/query/query_builder.cpp

@@ -104,11 +104,6 @@ void query_builder::visit(internal::query_select_nextval_part& part) {
   prepare_prototype(query_.prototype, part.sequence_name());
 }
 
-void query_builder::visit(internal::query_select_currval_part& part) {
-  query_.sql += dialect_->select() + " " + dialect_->currval() + "('" + part.sequence_name() + "')";
-  prepare_prototype(query_.prototype, part.sequence_name());
-}
-
 void query_builder::visit(internal::query_from_part &part) {
   query_.table_name = part.tables().front().name();
   query_.sql += " " + dialect_->from() + " ";

source/orm/query/sequence_pk_generator.cpp

@@ -6,21 +6,11 @@
 namespace matador::query {
 sequence_pk_generator::sequence_pk_generator(const std::string& sequence_name)
 : abstract_pk_generator(utils::generator_type::Sequence)
-, next_id_query_(query::select().nextval(sequence_name))
+, query_(query::select().nextval(sequence_name)) {
-, current_id_query_(query::select().currval(sequence_name)) {
 }
 
 utils::result<int64_t, utils::error> sequence_pk_generator::next_id(const sql::executor& exec) {
-    return next_id_query_.fetch_value<int64_t>(exec).and_then([](const std::optional<int64_t> id) -> utils::result<int64_t, utils::error> {
+    return query_.fetch_value<int64_t>(exec).and_then([](const std::optional<int64_t> id) -> utils::result<int64_t, utils::error> {
-        if (!id) {
-            return utils::failure(utils::error(sql::error_code::RETRIEVE_DATA_FAILED, "Sequence returned no value"));
-        }
-        return utils::ok(*id);
-    });
-}
-
-utils::result<int64_t, utils::error> sequence_pk_generator::current_id(const sql::executor& exec) {
-    return current_id_query_.fetch_value<int64_t>(exec).and_then([](const std::optional<int64_t> id) -> utils::result<int64_t, utils::error> {
         if (!id) {
             return utils::failure(utils::error(sql::error_code::RETRIEVE_DATA_FAILED, "Sequence returned no value"));
         }

source/orm/query/table_pk_generator.cpp

@@ -4,35 +4,23 @@
 #include "matador/query/error_code.hpp"
 #include "matador/query/expression/expression_operators.hpp"
 
-#include "matador/sql/error_code.hpp"
-
 namespace matador::query {
 table_pk_generator::table_pk_generator(const std::string& table_name, const std::string &sequence_name)
-: abstract_pk_generator(utils::generator_type::Table)
+: abstract_pk_generator(utils::generator_type::Table) {
-, next_id_query_(query::update(table_name)
+
+  query::update(table_name)
     .set("next_id"_col, "next_id"_col + 1)
     .where("name"_col == sequence_name)
-  .returning(("next_id"_col - 1).as("id")))
+    .returning(("next_id"_col - 1).as("id"));
-, current_id_query_(query::select({"next_id"_col})
+  /*
-  .from(table_name)
+  *UPDATE id_table
-  .where("name"_col == sequence_name)
+  SET next_id = next_id + 1
-) {}
+  WHERE name = 'users'
+  RETURNING next_id - 1 AS id;
+  */
+}
 
 utils::result<int64_t, utils::error> table_pk_generator::next_id(const sql::executor &exec) {
-    return next_id_query_.fetch_value<int64_t>(exec).and_then([](const std::optional<int64_t> id) -> utils::result<int64_t, utils::error> {
+  return utils::failure(utils::error{error_code::Failure});
-        if (!id) {
-            return utils::failure(utils::error(sql::error_code::RETRIEVE_DATA_FAILED, "Sequence returned no value"));
-        }
-        return utils::ok(*id);
-    });
-}
-
-utils::result<int64_t, utils::error> table_pk_generator::current_id(const sql::executor& exec) {
-    return current_id_query_.fetch_value<int64_t>(exec).and_then([](const std::optional<int64_t> id) -> utils::result<int64_t, utils::error> {
-        if (!id) {
-            return utils::failure(utils::error(sql::error_code::RETRIEVE_DATA_FAILED, "Sequence returned no value"));
-        }
-        return utils::ok(*id);
-    });
 }
 }

source/orm/sql/dialect.cpp

@@ -243,10 +243,6 @@ const std::string& dialect::nextval() const {
   return token_at(dialect_token::NextVal);
 }
 
-const std::string& dialect::currval() const {
-  return token_at(dialect_token::CurrVal);
-}
-
 const std::string &dialect::not_() const {
   return token_at(dialect_token::Not);
 }

source/orm/sql/error_code.cpp

@@ -30,8 +30,6 @@ std::string sql_category_impl::message(const int ev) const {
       return "Table exists failed";
     case error_code::RETRIEVE_DATA_FAILED:
       return "Retrieve data failed";
-    case error_code::SEQUENCE_EXISTS_FAILED:
-      return "Sequence exists failed";
     case error_code::RESET_FAILED:
       return "Reset failed";
     case error_code::OPEN_ERROR:

test/backends/SequenceFixture.cpp

@@ -10,7 +10,8 @@
 
 namespace matador::test {
 SequenceFixture::SequenceFixture()
-: db(connection::dns) {
+: db(connection::dns)
+, repo(db.dialect().default_schema_name()) {
     REQUIRE(db.open());
 }
 
@@ -19,6 +20,7 @@ SequenceFixture::~SequenceFixture() {
     drop_sequence_if_exists(sequences_to_drop.top());
     sequences_to_drop.pop();
   }
+  REQUIRE(repo.drop(db));
   REQUIRE(db.close());
 }
 
@@ -35,16 +37,5 @@ void SequenceFixture::check_sequence_not_exists(const std::string& sequence_name
 }
 
 void SequenceFixture::drop_sequence_if_exists(const std::string& sequence_name) const {
-  const auto result = db.sequence_exists(sequence_name).and_then([&sequence_name, this](const bool exists) {
-    if (exists) {
-      auto res = query::query::drop()
-        .sequence(sequence_name)
-        .execute(db);
-      REQUIRE(res);
-      this->check_sequence_not_exists(sequence_name);
-    }
-    return utils::ok(true);
-  });
-  REQUIRE(result);
 }
 }

test/backends/SequenceFixture.hpp

@@ -1,6 +1,7 @@
 #ifndef MATADOR_SEQUENCE_FIXTURE_HPP
 #define MATADOR_SEQUENCE_FIXTURE_HPP
 
+
 #include "matador/query/schema.hpp"
 
 #include "matador/sql/connection.hpp"
@@ -19,6 +20,7 @@ public:
 protected:
     sql::connection db;
     std::stack <std::string> sequences_to_drop;
+    query::schema repo;
 
 private:
     void drop_sequence_if_exists(const std::string &sequence_name) const;

test/backends/SequenceTest.cpp

@@ -7,7 +7,7 @@
 using namespace matador::query;
 using namespace matador::test;
 
-TEST_CASE_METHOD(SequenceFixture, "test create and drop sequence", "[sequence][create][drop]") {
+TEST_CASE_METHOD(SequenceFixture, "", "[sequence]") {
   auto result = query::create()
     .sequence("person_seq")
     .execute(db);
@@ -22,13 +22,6 @@ TEST_CASE_METHOD(SequenceFixture, "test create and drop sequence", "[sequence][c
   REQUIRE(next_id.is_ok());
   REQUIRE(*next_id == 1);
 
-  auto curr_id = query::select()
-    .currval("person_seq")
-    .fetch_value<uint32_t>(db);
-
-  REQUIRE(curr_id.is_ok());
-  REQUIRE(*curr_id == 1);
-
   result = query::drop()
     .sequence("person_seq")
     .execute(db);