130 lines
4.7 KiB
C++
130 lines
4.7 KiB
C++
/*
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* This file is a part of morm
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* and is distributed under the 2-Clause BSD licence.
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* Author: Tomasz Sowa <t.sowa@ttmath.org>
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*/
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/*
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* Copyright (c) 2018-2023, Tomasz Sowa
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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#ifndef headerfile_morm_src_dbexpression
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#define headerfile_morm_src_dbexpression
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#include <vector>
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#include "baseexpression.h"
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#include "morm_types.h"
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namespace morm
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{
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class DbExpression : public BaseExpression
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{
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public:
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DbExpression();
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virtual ~DbExpression();
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constexpr static const char * COLUMN_ROWS_COUNTER_POSTFIX = "_autoadded_rows_counter";
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virtual void prepare_to_where_clause();
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virtual DbExpression & group_or(pt::TextStream & stream);
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virtual DbExpression & group_and(pt::TextStream & stream);
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virtual DbExpression & group_end(pt::TextStream & stream);
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/*
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* page_number starts from zero (it's a number of a page, not an offset)
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*/
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virtual DbExpression & page(pt::TextStream & stream, size_t page_number, size_t page_size);
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template<typename FieldValue>
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void add_field_for_select(const wchar_t * new_column_expression, const wchar_t * new_column_name, FieldValue & field_value, const FT & field_type, ModelEnv * model_env)
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{
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std::wstring column_expression; // field() methods can be called recursively, so don't make it as class object
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column_expression = new_column_expression;
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column_expression += L" AS ";
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column_expression += new_column_name;
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field(column_expression.c_str(), field_value, field_type, model_env);
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}
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virtual void generate_rows_counter_column_name(ModelEnv & model_env, pt::TextStream & str);
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virtual void prepare_declare_cursor_query(const pt::TextStream & cursor_name, bool scroll_cursor, pt::TextStream & out_stream);
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virtual void prepare_fetch_next_query(const pt::TextStream & cursor_name, pt::TextStream & out_stream);
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virtual void prepare_fetch_prior_query(const pt::TextStream & cursor_name, pt::TextStream & out_stream);
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virtual void prepare_fetch_first_query(const pt::TextStream & cursor_name, pt::TextStream & out_stream);
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virtual void prepare_fetch_last_query(const pt::TextStream & cursor_name, pt::TextStream & out_stream);
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virtual void prepare_fetch_absotule_query(const pt::TextStream & cursor_name, long position, pt::TextStream & out_stream);
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virtual void prepare_fetch_relative_query(const pt::TextStream & cursor_name, long position, pt::TextStream & out_stream);
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virtual void prepare_fetch_forward_count_query(const pt::TextStream & cursor_name, size_t len, pt::TextStream & out_stream);
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virtual void prepare_fetch_backward_count_query(const pt::TextStream & cursor_name, size_t len, pt::TextStream & out_stream);
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virtual void prepare_fetch_all_query(const pt::TextStream & cursor_name, pt::TextStream & out_stream);
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protected:
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std::vector<int> conjunctions;
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bool can_field_be_generated(const FT & field_type);
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void field_before();
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void put_name_value_separator();
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void schema_table_separator();
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void table_field_separator();
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void alias_names_separator();
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void before_schema_name();
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void after_schema_name();
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void before_table_name();
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void after_table_name();
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void before_field_name();
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void after_field_name();
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void before_alias_name();
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void after_alias_name();
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void add_additional_columns(Model & model);
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void before_field_value_string(const FT & field_type, ModelEnv * model_env);
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void after_field_value_string(const FT & field_type, ModelEnv * model_env);
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virtual void add_rows_counter_column(Model & model);
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};
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}
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#endif
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