Added SQLite3 sink to the solution

include/spdlog/sinks/database_logger_sink.h

+#pragma once
+#include <spdlog\sinks\sink.h>
+#include <spdlog/details/log_msg.h>
+#include <spdlog/common.h>
+#include <vector>
+#include <sqlite3.h>
+
+struct Column
+{
+	enum TableColumn
+	{
+		TimeStamp,
+		Level,
+		Message,
+		LoggerName,
+		ThreadId
+	};
+
+	Column(std::string columnName, TableColumn columnMap)
+	{
+		ColumnName = columnName;
+		ColumnMap = columnMap;
+	}
+
+	std::string ColumnName;
+	TableColumn ColumnMap;
+	std::string Value;
+};
+
+struct database_schema
+{
+	std::string TableName;
+
+	std::vector<Column> Columns;
+
+	database_schema(const std::string& tableName, const std::vector<Column>& columns)
+	{
+		TableName = tableName;
+		Columns = columns;
+	}
+
+	database_schema()
+	{
+		TableName = "Logs";
+
+		Columns =
+		{
+			Column("TimeStamp", Column::TimeStamp),
+			Column("Level", Column::Level),
+			Column("Message", Column::Message),
+			Column("LoggerName", Column::LoggerName),
+			Column("ThreadId", Column::ThreadId)
+		};
+	}
+};
+
+namespace spdlog
+{
+	namespace sinks
+	{
+		class database_logger_sink :
+			public sink
+		{
+		public:
+			void flush() override
+			{
+				sqlite3_close(_database);
+			}
+
+			void log(const details::log_msg& msg) override
+			{
+
+				for (auto& column : _schema.Columns)
+				{
+					switch (column.ColumnMap)
+					{
+					case Column::TimeStamp:
+					{
+						auto time = std::chrono::system_clock::to_time_t(msg.time);
+						char str[26];
+						ctime_s(str, sizeof(str), &time);
+						column.Value = str;
+						break;
+					}
+
+					case Column::Level:
+					{
+						column.Value = level::to_str(msg.level);
+						break;
+					}
+					case Column::Message:
+					{
+						column.Value = msg.raw.str();
+						break;
+					}
+					case Column::LoggerName:
+					{
+						column.Value = msg.logger_name;
+						break;
+					}
+					case Column::ThreadId:
+					{
+						column.Value = std::to_string(msg.thread_id);
+						break;
+					}
+					}
+				}
+
+				auto query = fmt::format("INSERT INTO {0} ({1},{3},{5},{7},{9}) VALUES ('{2}','{4}','{6}','{8}',{10})",
+					_schema.TableName,
+					_schema.Columns[0].ColumnName,
+					_schema.Columns[0].Value,
+					_schema.Columns[1].ColumnName,
+					_schema.Columns[1].Value,
+					_schema.Columns[2].ColumnName,
+					_schema.Columns[2].Value,
+					_schema.Columns[3].ColumnName,
+					_schema.Columns[3].Value,
+					_schema.Columns[4].ColumnName,
+					_schema.Columns[4].Value);
+
+				char *errorMessage = nullptr;
+
+				if (sqlite3_exec(_database, query.c_str(), nullptr, nullptr, &errorMessage) != SQLITE_OK)
+				{
+					throw spdlog_ex(errorMessage);
+				}
+
+
+			}
+
+			explicit database_logger_sink(const std::string& databaseName)
+			{
+				if (sqlite3_open(databaseName.c_str(), &_database))
+					throw spdlog_ex("Error opening database");
+			}
+
+			explicit database_logger_sink(const std::string& databaseName, const database_schema& databaseSchema)
+			{
+				_schema = databaseSchema;
+
+				if (sqlite3_open(databaseName.c_str(), &_database))
+					throw spdlog_ex("Error opening database");
+			}
+
+			~database_logger_sink()
+			{
+				sqlite3_close(_database);
+			}
+
+		private:
+			database_schema _schema;
+			sqlite3 *_database;
+		};
+	}
+}