mirror of
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126 lines
3.3 KiB
C++
126 lines
3.3 KiB
C++
/*
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* SQLiteConnection.h, part of VCMI engine
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*
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* Authors: listed in file AUTHORS in main folder
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*
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* License: GNU General Public License v2.0 or later
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* Full text of license available in license.txt file, in main folder
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*
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*/
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#pragma once
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using sqlite3 = struct sqlite3;
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using sqlite3_stmt = struct sqlite3_stmt;
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class SQLiteInstance;
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class SQLiteStatement;
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using SQLiteInstancePtr = std::unique_ptr<SQLiteInstance>;
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using SQLiteStatementPtr = std::unique_ptr<SQLiteStatement>;
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class SQLiteStatement : boost::noncopyable
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{
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public:
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friend class SQLiteInstance;
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bool execute();
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void reset();
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void clear();
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~SQLiteStatement();
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template<typename... Args>
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void executeOnce(const Args &... args)
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{
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setBinds(args...);
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execute();
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reset();
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}
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template<typename... Args>
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void setBinds(const Args &... args)
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{
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setBindSingle(1, args...); // The leftmost SQL parameter has an index of 1
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}
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template<typename... Args>
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void getColumns(Args &... args)
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{
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getColumnSingle(0, args...); // The leftmost column of the result set has the index 0
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}
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private:
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void setBindSingle(size_t index, const double & value);
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void setBindSingle(size_t index, const bool & value);
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void setBindSingle(size_t index, const uint8_t & value);
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void setBindSingle(size_t index, const uint16_t & value);
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void setBindSingle(size_t index, const uint32_t & value);
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void setBindSingle(size_t index, const int32_t & value);
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void setBindSingle(size_t index, const int64_t & value);
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void setBindSingle(size_t index, const std::string & value);
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void setBindSingle(size_t index, const char * value);
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void getColumnSingle(size_t index, double & value);
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void getColumnSingle(size_t index, bool & value);
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void getColumnSingle(size_t index, uint8_t & value);
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void getColumnSingle(size_t index, uint16_t & value);
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void getColumnSingle(size_t index, uint32_t & value);
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void getColumnSingle(size_t index, int32_t & value);
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void getColumnSingle(size_t index, int64_t & value);
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void getColumnSingle(size_t index, std::string & value);
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template < typename T, typename std::enable_if_t < std::is_enum_v<T>, int > = 0 >
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void getColumnSingle(size_t index, T & value)
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{
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using Integer = std::underlying_type_t<T>;
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Integer result;
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getColumnSingle(index, result);
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value = static_cast<T>(result);
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}
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template<typename Rep, typename Period>
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void getColumnSingle(size_t index, std::chrono::duration<Rep, Period> & value)
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{
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int64_t durationValue = 0;
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getColumnSingle(index, durationValue);
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value = std::chrono::duration<Rep, Period>(durationValue);
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}
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SQLiteStatement(SQLiteInstance & instance, sqlite3_stmt * statement);
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template<typename T, typename... Args>
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void setBindSingle(size_t index, T const & arg, const Args &... args)
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{
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setBindSingle(index, arg);
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setBindSingle(index + 1, args...);
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}
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template<typename T, typename... Args>
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void getColumnSingle(size_t index, T & arg, Args &... args)
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{
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getColumnSingle(index, arg);
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getColumnSingle(index + 1, args...);
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}
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SQLiteInstance & m_instance;
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sqlite3_stmt * m_statement;
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};
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class SQLiteInstance : boost::noncopyable
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{
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public:
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friend class SQLiteStatement;
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static SQLiteInstancePtr open(const boost::filesystem::path & db_path, bool allow_write);
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~SQLiteInstance();
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SQLiteStatementPtr prepare(const std::string & statement);
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private:
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explicit SQLiteInstance(sqlite3 * connection);
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sqlite3 * m_connection;
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};
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