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author | louiz’ <louiz@louiz.org> | 2018-02-05 22:53:36 +0100 |
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committer | louiz’ <louiz@louiz.org> | 2018-02-05 22:53:36 +0100 |
commit | 56651cb5c29cc50ddf3c62c37167fa0b9389bfde (patch) | |
tree | ca652963cafeb02b0c6c7504b1cfbc27abdafe0b /src/database/index.hpp | |
parent | ad1e0f8d52189e18df2d5a39228e255798a9de70 (diff) | |
parent | e0d1a0b44add408504e428d6ce4a8a2121ea7a00 (diff) | |
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Merge branch 'master' into debian
Diffstat (limited to 'src/database/index.hpp')
-rw-r--r-- | src/database/index.hpp | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/src/database/index.hpp b/src/database/index.hpp new file mode 100644 index 0000000..30766ab --- /dev/null +++ b/src/database/index.hpp @@ -0,0 +1,38 @@ +#pragma once + +#include <database/engine.hpp> + +#include <string> +#include <tuple> + +namespace +{ +template <std::size_t N=0, typename... T> +typename std::enable_if<N == sizeof...(T), void>::type +add_column_name(std::string&) +{ } + +template <std::size_t N=0, typename... T> +typename std::enable_if<N < sizeof...(T), void>::type +add_column_name(std::string& out) +{ + using ColumnType = typename std::remove_reference<decltype(std::get<N>(std::declval<std::tuple<T...>>()))>::type; + out += ColumnType::name; + if (N != sizeof...(T) - 1) + out += ","; + add_column_name<N+1, T...>(out); +} +} + +template <typename... Columns> +void create_index(DatabaseEngine& db, const std::string& name, const std::string& table) +{ + std::string query{"CREATE INDEX IF NOT EXISTS "}; + query += name + " ON " + table + "("; + add_column_name<0, Columns...>(query); + query += ")"; + + auto result = db.raw_exec(query); + if (std::get<0>(result) == false) + log_error("Error executing query: ", std::get<1>(result)); +} |