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#include <mysql/mysql.h>
#include <sspdlog/sspdlog.h>
#include <oyoung/format.hpp>
namespace mysql {
struct library {
library(int argc, char **argv, char **groups) {
if(mysql_library_init(argc, argv, groups)) {
throw std::runtime_error("MYSQL Initialize failed");
}
}
~library() {
mysql_library_end();
}
};
struct row {
row(MYSQL_ROW row): m_row(row) {}
~row() {}
operator bool() const {
return m_row;
}
std::string operator[](std::size_t index) const {
return m_row[index];
}
row(const row&) = delete;
row(row&& other): m_row(other.m_row) {
other.m_row = nullptr;
}
private:
MYSQL_ROW m_row{nullptr};
};
struct field {
field(MYSQL_FIELD *field): m_field(field) {}
std::string name() const {
return m_field->name;
}
std::string catalog() const {
return std::string(m_field->catalog, m_field->catalog_length);
}
~field() {
}
field(const field&) = delete;
field(field&& other): m_field(other.m_field) {
other.m_field = nullptr;
}
protected:
MYSQL_FIELD *m_field{nullptr};
};
struct fields : field {
fields(MYSQL_FIELD *f) : field(f) {}
field operator[](std::size_t index) {
return m_field + index;
}
};
struct result {
result() = default;
result(MYSQL_RES *res): m_result(res) {}
~result() {
if(m_result) {
::mysql_free_result(m_result);
}
}
result(const result&) = delete;
result(result&& other): m_result(other.m_result) {
other.m_result = nullptr;
}
row fetch_row() {
return mysql_fetch_row(m_result);
}
std::uint64_t rows() const {
return mysql_num_rows(m_result);
}
unsigned field_count() const {
return ::mysql_num_fields(m_result);
}
fields fetch_fields() {
return mysql_fetch_fields(m_result);
}
private:
MYSQL_RES *m_result {nullptr};
};
struct client {
client()
: m_client(mysql_init(nullptr)) {
}
bool good() const {
return nullptr != m_client;
}
bool not_good() const {
return nullptr == m_client;
}
bool connect(const std::string& host, const std::string& user, const std::string& password, const std::string& database,
unsigned short port = 3306) {
return mysql_real_connect(m_client, host.c_str(), user.c_str(), password.c_str(), database.c_str(), port, nullptr, 0) != nullptr;
}
bool query(const std::string& sql) {
return mysql_real_query(m_client, sql.c_str(), sql.length()) == 0;
}
std::uint64_t affected_rows() const {
return mysql_affected_rows(m_client);
}
std::uint64_t inserted_id() const {
return mysql_insert_id(m_client);
}
result use_result() const {
return result(mysql_use_result(m_client));
}
~client() {
}
std::string error() const {
return mysql_error(m_client);
}
private:
MYSQL *m_client;
};
}
int main(int argc, char**argv) try {
mysql::library library(argc, argv, nullptr);
mysql::client client{};
if(client.not_good()) {
SSPD_LOG_ERROR << "Create MySQL client failed";
return -1;
}
if(!client.connect("172.17.0.2", "blog", "blog.123", "blog")) {
SSPD_LOG_ERROR << "MySQL connect failed: " << client.error();
return -2;
}
if(!client.query("INSERT INTO user set name='blog', email='blog@hotmail.com'")) {
SSPD_LOG_ERROR << "MySQL query INSERT failed: " << client.error();
return -3;
}
SSPD_LOG_INFO << "MySQL affected rows after insert: " << client.affected_rows();
SSPD_LOG_INFO << "MySQL last inserted ID: " << client.inserted_id();
if(!client.query("SELECT id, name, email FROM user")) {
SSPD_LOG_ERROR << "MySQL query SELECT failed: " << client.error();
return -3;
}
auto result = client.use_result();
auto field_count = result.field_count();
auto fields = result.fetch_fields();
while (auto row = result.fetch_row()) {
for(auto i = 0; i < field_count; ++i) {
SSPD_LOG_INFO << fields[i].name() << ": " << row[i];
}
}
if(!client.query(oyoung::format("DELETE FROM user WHERE id=%1").arg(client.inserted_id()).to_string())) {
SSPD_LOG_ERROR << "MySQL query DELETE failed: " << client.error();
return -3;
}
SSPD_LOG_INFO << "MySQL affected rows after delete: " << client.affected_rows();
return 0;
} catch(const std::exception& e) {
SSPD_LOG_ERROR << e.what();
}
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