postgresql__result_8hpp_source.html

#ifndef MSTL_DATABASE_POSTGRESQL_RESULT_HPP__

#define MSTL_DATABASE_POSTGRESQL_RESULT_HPP__

#ifdef MSTL_SUPPORT_POSTGRESQL__

#include "MSTL/core/config/undef_cmacro.hpp"

#include "MSTL/database/db_interface.hpp"

#include <libpq-fe.h>

MSTL_BEGIN_NAMESPACE__


class MSTL_API postgresql_tb_result final : public idb_tb_result {

private:

    mutable vector<string_view> column_names_;

    ::PGresult* result_ = nullptr;

    size_type current_row_ = 0;

    size_type row_count_ = 0;

    size_type column_count_ = 0;

    bool owns_result_;


protected:

    void init_column_names() const;

    bool is_null(size_type index) const;


public:

    explicit postgresql_tb_result(::PGresult* result, bool owns = true) noexcept;

    ~postgresql_tb_result() override;


    postgresql_tb_result(const postgresql_tb_result&) = delete;

    postgresql_tb_result& operator =(const postgresql_tb_result&) = delete;


    MSTL_NODISCARD bool empty() const noexcept override { return row_count_ == 0; }

    MSTL_NODISCARD bool next() noexcept override;


    MSTL_NODISCARD size_type row_count() const noexcept override { return row_count_; }

    MSTL_NODISCARD size_type column_count() const noexcept override { return column_count_; }

    MSTL_NODISCARD const vector<string_view>& column_names() const override;


    MSTL_NODISCARD string_view get(size_type index) const override;

    MSTL_NODISCARD bool get_bool(size_type index) const override;

    MSTL_NODISCARD int8_t get_int8(size_type index) const override;

    MSTL_NODISCARD int16_t get_int16(size_type index) const override;

    MSTL_NODISCARD int32_t get_int32(size_type index) const override;

    MSTL_NODISCARD int64_t get_int64(size_type index) const override;

    MSTL_NODISCARD float32_t get_float32(size_type index) const override;

    MSTL_NODISCARD float64_t get_float64(size_type index) const override;

    MSTL_NODISCARD decimal_t get_decimal(size_type index) const override;

    MSTL_NODISCARD vector<char> get_blob(size_type index) const override;

    MSTL_NODISCARD string get_set(size_type index) const override { return get_string(index); }

    MSTL_NODISCARD uint64_t get_bit(size_type index) const override;

    MSTL_NODISCARD _MSTL date get_date(size_type index) const override;

    MSTL_NODISCARD _MSTL time get_time(size_type index) const override;

    MSTL_NODISCARD _MSTL datetime get_datetime(size_type index) const override;

    MSTL_NODISCARD _MSTL timestamp get_timestamp(size_type index) const override;

    MSTL_NODISCARD string get_string(size_type index) const override { return string{get(index)}; }

    MSTL_NODISCARD string_view get_enum(size_type index) const override { return get(index); }

};


MSTL_END_NAMESPACE__

#endif

#endif // MSTL_DATABASE_POSTGRESQL_RESULT_HPP__

get
MSTL_ALWAYS_INLINE enable_if_t< is_void_v< T >, future_result_t< T > > get(future< T > &f)
通用future结果获取函数
定义 future.hpp:1202

float32_t
float float32_t
32位单精度浮点数类型
定义 types.hpp:111

decimal_t
long double decimal_t
扩展精度浮点数类型
定义 types.hpp:125

int64_t
long long int64_t
64位有符号整数类型
定义 types.hpp:68

float64_t
double float64_t
64位双精度浮点数类型
定义 types.hpp:117

uint64_t
unsigned long long uint64_t
64位无符号整数类型
定义 types.hpp:99

int16_t
short int16_t
16位有符号整数类型
定义 types.hpp:54

int32_t
int int32_t
32位有符号整数类型
定义 types.hpp:60

int8_t
signed char int8_t
8位有符号整数类型
定义 types.hpp:48

next
constexpr Iterator next(Iterator iter, iter_difference_t< Iterator > n=1)
获取迭代器的后一个位置
定义 iterator.hpp:134

_MSTL
#define _MSTL
全局命名空间MSTL前缀
定义 c++config.hpp:274

MSTL_END_NAMESPACE__
#define MSTL_END_NAMESPACE__
结束全局命名空间MSTL
定义 c++config.hpp:268

MSTL_BEGIN_NAMESPACE__
#define MSTL_BEGIN_NAMESPACE__
开始全局命名空间MSTL
定义 c++config.hpp:262

empty
MSTL_NODISCARD MSTL_ALWAYS_INLINE constexpr bool empty(const Container &cont) noexcept(noexcept(cont.empty()))
检查容器是否为空
定义 type_erase.hpp:383