39 lines
995 B
C++
39 lines
995 B
C++
#pragma once
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#include <database/engine.hpp>
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#include <string>
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#include <tuple>
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namespace
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{
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template <std::size_t N=0, typename... T>
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typename std::enable_if<N == sizeof...(T), void>::type
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add_column_name(std::string&)
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{ }
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template <std::size_t N=0, typename... T>
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typename std::enable_if<N < sizeof...(T), void>::type
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add_column_name(std::string& out)
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{
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using ColumnType = typename std::remove_reference<decltype(std::get<N>(std::declval<std::tuple<T...>>()))>::type;
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out += ColumnType::name;
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if (N != sizeof...(T) - 1)
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out += ",";
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add_column_name<N+1, T...>(out);
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}
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}
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template <typename... Columns>
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void create_index(DatabaseEngine& db, const std::string& name, const std::string& table)
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{
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std::string query{"CREATE INDEX IF NOT EXISTS "};
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query += name + " ON " + table + "(";
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add_column_name<0, Columns...>(query);
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query += ")";
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auto result = db.raw_exec(query);
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if (std::get<0>(result) == false)
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log_error("Error executing query: ", std::get<1>(result));
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}
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