sqld.h

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/*
BSD 3-Clause License
 
Copyright (c) 2022, Stable Cloud Computing, Inc.
 
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
 
1. Redistributions of source code must retain the above copyright notice, this
   list of conditions and the following disclaimer.
 
2. Redistributions in binary form must reproduce the above copyright notice,
   this list of conditions and the following disclaimer in the documentation
   and/or other materials provided with the distribution.
 
3. Neither the name of the copyright holder nor the names of its
   contributors may be used to endorse or promote products derived from
   this software without specific prior written permission.
 
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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*/
#ifndef _SCC_SQLD_H
#define _SCC_SQLD_H
 
#include <string>
#include <sstream>
#include <vector>
 
struct sqlite3;     // forward declaration
struct sqlite3_stmt;
 
namespace scc::sqld
{
 
class Conn
{
    sqlite3* m_db;
    friend class Req;
 
    void close();
public:
    Conn(const std::string& = "file:mem?mode=memory&cache=shared");
    virtual ~Conn();
 
    Conn(const Conn&) = delete;
    Conn& operator=(const Conn&) = delete;
    Conn(Conn&&) = delete;
    Conn& operator=(Conn&&) = delete;
 
    void reopen(const std::string& = "file:mem?mode=memory&cache=shared");
};
 
class Trans
{
    Conn& m_conn;
    bool m_active;
public:
    Trans(Conn&);
    virtual ~Trans();
 
    void begin();
    
    void commit();
    
    void abort();
 
    bool is_active() const { return m_active; }
};
 
class Req
{
    Conn& m_conn;
    sqlite3_stmt* m_stmt;
 
    std::ostringstream m_sql;
    std::string::size_type m_pos;
    int m_cols;
 
    void finalize();
    void prepare();
public:
    Req(Conn&);
    virtual ~Req();
 
    void clear();
 
    void reset();
 
    int exec_select();
 
    int next_row();
 
    void exec();
 
    std::string col_name(int);
    
    void col_name(int, std::string&);
 
    std::string col_text(int);
    
    void col_text(int, std::string&);
 
    int col_int(int);
 
    int64_t col_int64(int);
 
    double col_real(int);
 
    void col_blob(int, std::vector<char>&);
 
    std::ostringstream& sql()
    {
        return m_sql;
    }
};
 
}
 
#endif