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Provide some functions for incrementing the value of given columns. (#1831)
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Tanglong3bf
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commit
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@ -489,6 +489,41 @@ class CoroMapper : public Mapper<T>
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std::forward<Arguments>(args)...);
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}
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template <typename... Arguments>
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inline internal::MapperAwaiter<size_t> increment(
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const std::vector<std::string> &colNames,
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const Criteria &criteria,
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Arguments... args)
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{
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static_assert(sizeof...(args) > 0);
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assert(colNames.size() == sizeof...(args));
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std::string sql = "update ";
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sql += T::tableName;
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sql += " set ";
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std::vector<const char *> temps;
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(void)std::initializer_list<int>{(
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[&args, &temps] {
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args = (args < 0) ? (temps.push_back(" - $?,"), -args)
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: (temps.push_back(" + $?,"), args);
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}(),
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0)...};
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for (int i = 0; i < sizeof...(args); ++i)
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{
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const auto &colName = colNames[i];
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sql += colName;
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sql += " = ";
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sql += colName;
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sql += temps[i];
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}
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sql[sql.length() - 1] = ' '; // Replace the last ','
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return updateByHelper(std::move(sql),
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criteria,
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std::forward<Arguments>(args)...);
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}
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private:
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template <typename... Arguments>
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internal::MapperAwaiter<size_t> updateByHelper(std::string &&sql,
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@ -577,6 +577,53 @@ class Mapper
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const Criteria &criteria,
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Arguments &&...args) noexcept;
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/**
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* @brief Update some records that match the given criteria.
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*
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* @param colNames Columns to increment.
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* @param criteria The criteria.
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* @param args Specify the amount by which the columns should be
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* incremented.
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* @return size_t The number of updated records.
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*/
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template <typename... Arguments>
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size_t increment(const std::vector<std::string> &colNames,
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const Criteria &criteria,
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Arguments... args) noexcept(false);
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/**
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* @brief Asynchronously update some records that match the given criteria.
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*
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* @param colNames Columns to increment.
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* @param criteria The criteria.
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* @param rcb is called with the result.
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* @param ecb is called when an error occurs.
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* @param args Specify the amount by which the columns should be
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* incremented.
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*/
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template <typename... Arguments>
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void increment(const std::vector<std::string> &colNames,
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const CountCallback &rcb,
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const ExceptionCallback &ecb,
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const Criteria &criteria,
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Arguments... args) noexcept;
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/**
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* @brief Asynchronously update some records that match the given criteria.
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*
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* @param colNames Columns to increment.
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* @param criteria The criteria.
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* @param args Specify the amount by which the columns should be
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* incremented.
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* @return std::future<size_t> The future object with which user can get the
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* number of updated records.
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*/
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template <typename... Arguments>
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std::future<size_t> incrementFuture(
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const std::vector<std::string> &colNames,
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const Criteria &criteria,
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Arguments... args) noexcept;
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/**
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* @brief Delete a record from the table.
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*
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@ -1497,6 +1544,160 @@ inline std::future<size_t> Mapper<T>::updateFutureBy(
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return prom->get_future();
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}
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template <typename T>
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template <typename... Arguments>
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inline size_t Mapper<T>::increment(const std::vector<std::string> &colNames,
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const Criteria &criteria,
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Arguments... args) noexcept(false)
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{
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static_assert(sizeof...(args) > 0);
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assert(colNames.size() == sizeof...(args));
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clear();
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std::string sql = "update ";
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sql += T::tableName;
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sql += " set ";
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std::vector<const char *> temps;
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(void)std::initializer_list<int>{(
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[&args, &temps] {
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args = (args < 0) ? (temps.push_back(" - $?,"), -args)
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: (temps.push_back(" + $?,"), args);
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}(),
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0)...};
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for (int i = 0; i < sizeof...(args); ++i)
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{
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const auto &colName = colNames[i];
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sql += colName;
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sql += " = ";
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sql += colName;
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sql += temps[i];
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}
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sql[sql.length() - 1] = ' '; // Replace the last ','
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if (criteria)
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{
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sql += " where ";
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sql += criteria.criteriaString();
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}
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sql = replaceSqlPlaceHolder(sql, "$?");
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Result r(nullptr);
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{
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auto binder = *client_ << std::move(sql);
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(void)std::initializer_list<int>{
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(binder << std::forward<Arguments>(args), 0)...};
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if (criteria)
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criteria.outputArgs(binder);
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binder << Mode::Blocking;
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binder >> [&r](const Result &result) { r = result; };
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binder.exec(); // Maybe throw exception;
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}
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return r.affectedRows();
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}
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template <typename T>
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template <typename... Arguments>
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inline void Mapper<T>::increment(const std::vector<std::string> &colNames,
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const CountCallback &rcb,
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const ExceptionCallback &ecb,
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const Criteria &criteria,
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Arguments... args) noexcept
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{
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static_assert(sizeof...(args) > 0);
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assert(colNames.size() == sizeof...(args));
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clear();
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std::string sql = "update ";
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sql += T::tableName;
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sql += " set ";
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std::vector<const char *> temps;
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(void)std::initializer_list<int>{(
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[&args, &temps] {
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args = args < 0 ? (temps.push_back(" - $?,"), -args)
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: (temps.push_back(" + $?,"), args);
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}(),
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0)...};
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for (int i = 0; i < sizeof...(args); ++i)
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{
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const auto &colName = colNames[i];
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sql += colName;
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sql += " = ";
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sql += colName;
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sql += temps[i];
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}
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sql[sql.length() - 1] = ' '; // Replace the last ','
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if (criteria)
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{
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sql += " where ";
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sql += criteria.criteriaString();
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}
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sql = replaceSqlPlaceHolder(sql, "$?");
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auto binder = *client_ << std::move(sql);
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(void)std::initializer_list<int>{
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(binder << std::forward<Arguments>(args), 0)...};
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if (criteria)
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criteria.outputArgs(binder);
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binder >> [rcb](const Result &r) { rcb(r.affectedRows()); };
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binder >> ecb;
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}
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template <typename T>
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template <typename... Arguments>
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inline std::future<size_t> Mapper<T>::incrementFuture(
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const std::vector<std::string> &colNames,
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const Criteria &criteria,
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Arguments... args) noexcept
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{
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static_assert(sizeof...(args) > 0);
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assert(colNames.size() == sizeof...(args));
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clear();
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std::string sql = "update ";
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sql += T::tableName;
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sql += " set ";
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std::vector<const char *> temps;
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(void)std::initializer_list<int>{(
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[&args, &temps] {
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args = args < 0 ? (temps.push_back(" - $?,"), -args)
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: (temps.push_back(" + $?,"), args);
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}(),
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0)...};
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for (int i = 0; i < sizeof...(args); ++i)
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{
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const auto &colName = colNames[i];
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sql += colName;
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sql += " = ";
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sql += colName;
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sql += temps[i];
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}
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sql[sql.length() - 1] = ' '; // Replace the last ','
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if (criteria)
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{
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sql += " where ";
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sql += criteria.criteriaString();
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}
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sql = replaceSqlPlaceHolder(sql, "$?");
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auto binder = *client_ << std::move(sql);
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(void)std::initializer_list<int>{
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(binder << std::forward<Arguments>(args), 0)...};
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if (criteria)
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criteria.outputArgs(binder);
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std::shared_ptr<std::promise<size_t>> prom =
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std::make_shared<std::promise<size_t>>();
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binder >> [prom](const Result &r) { prom->set_value(r.affectedRows()); };
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binder >> [prom](const std::exception_ptr &e) { prom->set_exception(e); };
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binder.exec();
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return prom->get_future();
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}
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template <typename T>
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inline size_t Mapper<T>::deleteOne(const T &obj) noexcept(false)
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{
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