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sqlite.hpp
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sqlite.hpp
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//
// Created by qiyu on 10/28/17.
//
#include <string>
#include <vector>
#include <climits>
#include <sqlite3.h>
#include "utility.hpp"
#ifndef ORM_SQLITE_HPP
#define ORM_SQLITE_HPP
namespace ormpp{
class sqlite{
public:
~sqlite(){
disconnect();
}
void set_last_error(std::string last_error) {
last_error_ = std::move(last_error);
//std::cout << last_error_ << std::endl;//todo, write to log file
}
std::string get_last_error() const {
return last_error_;
}
template <typename... Args>
bool connect(Args&&... args){
auto r = sqlite3_open(std::forward<Args>(args)..., &handle_);
if (r == SQLITE_OK) {
return true;
}
set_last_error(sqlite3_errmsg(handle_));
return false;
}
template <typename... Args>
bool disconnect(Args&&... args){
if(handle_!= nullptr){
auto r = sqlite3_close(handle_);
handle_ = nullptr;
if (r == SQLITE_OK) {
return true;
}
set_last_error(sqlite3_errmsg(handle_));
return false;
}
return true;
}
template<typename T, typename... Args>
bool create_datatable(Args&&... args){
// std::string droptb = "DROP TABLE IF EXISTS ";
// droptb += iguana::get_name<T>();
// if (sqlite3_exec(handle_, droptb.data(), nullptr, nullptr, nullptr)!=SQLITE_OK) {
// return false;
// }
std::string sql = generate_createtb_sql<T>(std::forward<Args>(args)...);
if (sqlite3_exec(handle_, sql.data(), nullptr, nullptr, nullptr) != SQLITE_OK) {
set_last_error(sqlite3_errmsg(handle_));
return false;
}
return true;
}
template<typename T, typename... Args>
int insert(const T& t,Args&&... args){
std::string sql = auto_key_map_.empty()?generate_insert_sql<T>(false): generate_auto_insert_sql0<T>(auto_key_map_, false);
return insert_impl(false, sql, t, std::forward<Args>(args)...);
}
template<typename T, typename... Args>
int insert(const std::vector<T>& t, Args&&... args){
std::string sql = auto_key_map_.empty()?generate_insert_sql<T>(false): generate_auto_insert_sql0<T>(auto_key_map_, false);
return insert_impl(false, sql, t, std::forward<Args>(args)...);
}
template<typename T, typename... Args>
int update(const T& t, Args&&... args) {
std::string sql = generate_insert_sql<T>(true);
return insert_impl(true, sql, t, std::forward<Args>(args)...);
}
template<typename T, typename... Args>
int update(const std::vector<T>& t, Args&&... args){
std::string sql = generate_insert_sql<T>(true);
return insert_impl(true, sql, t, std::forward<Args>(args)...);
}
template<typename T, typename... Args>
bool delete_records(Args&&... where_conditon){
auto sql = generate_delete_sql<T>(std::forward<Args>(where_conditon)...);
if (sqlite3_exec(handle_, sql.data(), nullptr, nullptr, nullptr)!=SQLITE_OK) {
set_last_error(sqlite3_errmsg(handle_));
return false;
}
return true;
}
//restriction, all the args are string, the first is the where condition, rest are append conditions
template<typename T, typename... Args>
std::enable_if_t<iguana::is_reflection_v<T>, std::vector<T>> query(Args&&... args){
std::string sql = generate_query_sql<T>(args...);
constexpr auto SIZE = iguana::get_value<T>();
int result = sqlite3_prepare_v2(handle_, sql.data(), (int)sql.size(), &stmt_, nullptr);
if (result != SQLITE_OK) {
set_last_error(sqlite3_errmsg(handle_));
return {};
}
auto guard = guard_statment(stmt_);
std::vector<T> v;
while (true)
{
result = sqlite3_step(stmt_);
if (result == SQLITE_DONE)
break;
if (result != SQLITE_ROW)
break;
T t = {};
iguana::for_each(t, [this, &t](auto item, auto I)
{
assign(t.*item, (int)decltype(I)::value);
});
v.push_back(std::move(t));
}
return v;
}
template<typename T, typename Arg, typename... Args>
std::enable_if_t<!iguana::is_reflection_v<T>, std::vector<T>> query(const Arg& s, Args&&... args){
static_assert(iguana::is_tuple<T>::value);
constexpr auto SIZE = std::tuple_size_v<T>;
std::string sql = s;
constexpr auto Args_Size = sizeof...(Args);
if(Args_Size!=0){
if(Args_Size!=std::count(sql.begin(), sql.end(), '?'))
return {};
sql = get_sql(sql, std::forward<Args>(args)...);
}
int result = sqlite3_prepare_v2(handle_, sql.data(), (int)sql.size(), &stmt_, nullptr);
if (result != SQLITE_OK) {
set_last_error(sqlite3_errmsg(handle_));
return {};
}
auto guard = guard_statment(stmt_);
std::vector<T> v;
while (true)
{
result = sqlite3_step(stmt_);
if (result == SQLITE_DONE)
break;
if (result != SQLITE_ROW)
break;
T tp = {};
int index = 0;
iguana::for_each(tp, [this, &index](auto& item, auto I)
{
if constexpr(iguana::is_reflection_v<decltype(item)>){
std::remove_reference_t<decltype(item)> t = {};
iguana::for_each(t, [this, &index, &t](auto ele, auto i)
{
assign(t.*ele, index++);
});
item = std::move(t);
}else{
assign(item, index++);
}
}, std::make_index_sequence<SIZE>{});
if(index>0)
v.push_back(std::move(tp));
}
return v;
}
//just support execute string sql without placeholders
bool execute(const std::string& sql){
if (sqlite3_exec(handle_, sql.data(), nullptr, nullptr, nullptr) != SQLITE_OK) {
set_last_error(sqlite3_errmsg(handle_));
return false;
}
return true;
}
int get_last_affect_rows() {
return sqlite3_changes(handle_);
}
//transaction
bool begin(){
if (sqlite3_exec(handle_, "BEGIN", nullptr, nullptr, nullptr) != SQLITE_OK) {
set_last_error(sqlite3_errmsg(handle_));
return false;
}
return true;
}
bool commit(){
if (sqlite3_exec(handle_, "COMMIT", nullptr, nullptr, nullptr) != SQLITE_OK) {
set_last_error(sqlite3_errmsg(handle_));
return false;
}
return true;
}
bool rollback(){
if (sqlite3_exec(handle_, "ROLLBACK", nullptr, nullptr, nullptr) != SQLITE_OK) {
set_last_error(sqlite3_errmsg(handle_));
return false;
}
return true;
}
private:
template<typename T, typename... Args >
std::string generate_createtb_sql(Args&&... args)
{
const auto type_name_arr = get_type_names<T>(DBType::sqlite);
auto name = get_name<T>();
std::string sql = std::string("CREATE TABLE IF NOT EXISTS ") + name.data()+"(";
auto arr = iguana::get_array<T>();
constexpr auto SIZE = sizeof... (Args);
auto_key_map_[name.data()] = "";
//auto_increment_key and key can't exist at the same time
using U = std::tuple<std::decay_t <Args>...>;
if constexpr (SIZE>0){
//using U = std::tuple<std::decay_t <Args>...>; //the code can't compile in vs2017, why?maybe args... in if constexpr?
static_assert(!(iguana::has_type<ormpp_key, U>::value&&iguana::has_type<ormpp_auto_key, U>::value), "should only one key");
}
auto tp = sort_tuple(std::make_tuple(std::forward<Args>(args)...));
const size_t arr_size = arr.size();
for(size_t i=0; i< arr_size; ++i) {
auto field_name = arr[i];
bool has_add_field = false;
for_each0(tp, [&sql, &i, &has_add_field, field_name, type_name_arr,name, this](auto item){
if constexpr (std::is_same_v<decltype(item), ormpp_not_null>){
if(item.fields.find(field_name.data())==item.fields.end())
return;
}
else{
if(item.fields != field_name.data())
return;
}
if constexpr (std::is_same_v<decltype(item), ormpp_not_null>){
if(!has_add_field){
append(sql, field_name.data(), " ", type_name_arr[i]);
}
append(sql, " NOT NULL");
has_add_field = true;
}
else if constexpr (std::is_same_v<decltype(item), ormpp_key>){
if(!has_add_field){
append(sql, field_name.data(), " ", type_name_arr[i]);
}
append(sql, " PRIMARY KEY ");
has_add_field = true;
}
else if constexpr (std::is_same_v<decltype(item), ormpp_auto_key>){
if(!has_add_field){
append(sql, field_name.data(), " ", type_name_arr[i]);
}
append(sql, " PRIMARY KEY AUTOINCREMENT");
auto_key_map_[name.data()] = item.fields;
has_add_field = true;
}
else if constexpr (std::is_same_v<decltype(item), ormpp_unique>) {
if (!has_add_field) {
append(sql, field_name.data(), " ", type_name_arr[i]);
}
append(sql, ", UNIQUE(", item.fields,")");
has_add_field = true;
}
else {
append(sql, field_name.data(), " ", type_name_arr[i]);
}
}, std::make_index_sequence<SIZE>{});
if(!has_add_field){
append(sql, field_name.data(), " ", type_name_arr[i]);
}
if(i<arr_size-1)
sql+=", ";
}
sql += ")";
return sql;
}
struct guard_statment{
guard_statment(sqlite3_stmt* stmt):stmt_(stmt){}
sqlite3_stmt* stmt_= nullptr;
int status_ = 0;
~guard_statment(){
if(stmt_!= nullptr)
status_ = sqlite3_finalize(stmt_);
if(status_)
fprintf(stderr, "close statment error code %d\n", status_);
}
};
template<typename T>
bool set_param_bind(T&& value, int i){
using U = std::remove_const_t<std::remove_reference_t<T>>;
if constexpr(std::is_integral_v<U>&&!iguana::is_int64_v<U>){//double, int64
return SQLITE_OK == sqlite3_bind_int(stmt_, i, value);
}
else if constexpr (iguana::is_int64_v<U>){
return SQLITE_OK == sqlite3_bind_int64(stmt_, i, value);
}
else if constexpr (std::is_floating_point_v<U>){
return SQLITE_OK == sqlite3_bind_double(stmt_, i, value);
}
else if constexpr(std::is_same_v<std::string, U>){
return SQLITE_OK == sqlite3_bind_text(stmt_, i, value.data(), (int)value.size(), nullptr);
}
else if constexpr(is_char_array_v<U>) {
return SQLITE_OK == sqlite3_bind_text(stmt_, i, value, sizeof(U), nullptr);
}
else {
std::cout<<"this type has not supported yet"<<std::endl;
return false;
}
}
template<typename T>
void assign(T&& value, int i){
using U = std::remove_const_t<std::remove_reference_t<T>>;
if constexpr(std::is_integral_v<U>&&!iguana::is_int64_v<U>){//double, int64
value = sqlite3_column_int(stmt_, i);
}
else if constexpr (iguana::is_int64_v<U>){
value = sqlite3_column_int64(stmt_, i);
}
else if constexpr (std::is_floating_point_v<U>){
value = sqlite3_column_double(stmt_, i);
}
else if constexpr(std::is_same_v<std::string, U>){
value.reserve(sqlite3_column_bytes(stmt_, i));
value.assign((const char*)sqlite3_column_text(stmt_, i), (size_t)sqlite3_column_bytes(stmt_, i));
}
else if constexpr (is_char_array_v<U>) {
memcpy(value, sqlite3_column_text(stmt_, i), sizeof(U));
}
else {
std::cout<<"this type has not supported yet"<<std::endl;
}
}
template<typename T, typename... Args>
int insert_impl(bool is_update, const std::string& sql, const T& t, Args&&... args) {
int result = sqlite3_prepare_v2(handle_, sql.data(), (int)sql.size(), &stmt_, nullptr);
if (result != SQLITE_OK) {
set_last_error(sqlite3_errmsg(handle_));
return INT_MIN;
}
auto guard = guard_statment(stmt_);
auto it = auto_key_map_.find(get_name<T>());
std::string auto_key = (is_update||it==auto_key_map_.end())?"":it->second;
bool bind_ok = true;
int index = 0;
iguana::for_each(t, [&t, &bind_ok, &auto_key, &index, this](auto item, auto i){
if(!bind_ok)
return;
if(!auto_key.empty()&&auto_key==iguana::get_name<T>(decltype(i)::value).data()){
return;
}
bind_ok = set_param_bind(t.*item, index+1);
index++;
});
if (!bind_ok) {
set_last_error(sqlite3_errmsg(handle_));
return INT_MIN;
}
result = sqlite3_step(stmt_);
if (result != SQLITE_DONE) {
set_last_error(sqlite3_errmsg(handle_));
return INT_MIN;
}
return 1;
}
template<typename T, typename... Args>
int insert_impl(bool is_update, const std::string& sql, const std::vector<T>& v, Args&&... args) {
int result = sqlite3_prepare_v2(handle_, sql.data(), (int)sql.size(), &stmt_, nullptr);
if (result != SQLITE_OK) {
set_last_error(sqlite3_errmsg(handle_));
return INT_MIN;
}
auto guard = guard_statment(stmt_);
bool b = begin();
if (!b) {
set_last_error(sqlite3_errmsg(handle_));
return INT_MIN;
}
auto it = auto_key_map_.find(get_name<T>());
std::string auto_key = (is_update||it==auto_key_map_.end())?"":it->second;
for(auto& t : v){
bool bind_ok = true;
int index = 0;
iguana::for_each(t, [&t, &bind_ok, &auto_key, &index, this](auto item, auto i){
if(!bind_ok)
return;
if(!auto_key.empty()&&auto_key==iguana::get_name<T>(decltype(i)::value).data()){
return;
}
bind_ok = set_param_bind(t.*item, index+1);
index++;
});
if(!bind_ok){
rollback();
set_last_error(sqlite3_errmsg(handle_));
return INT_MIN;
}
result = sqlite3_step(stmt_);
if (result != SQLITE_DONE){
rollback();
set_last_error(sqlite3_errmsg(handle_));
return INT_MIN;
}
result = sqlite3_reset(stmt_);
if (result != SQLITE_OK){
rollback();
set_last_error(sqlite3_errmsg(handle_));
return INT_MIN;
}
}
b = commit();
return b?(int)v.size():INT_MIN;
}
template<typename T>
inline std::string generate_auto_insert_sql0(std::map<std::string, std::string>& auto_key_map_, bool replace) {
std::string sql = replace ? "replace into " : "insert into ";
constexpr auto SIZE = iguana::get_value<T>();
auto name = get_name<T>();
append(sql, name.data());
std::string fields = "(";
std::string values = " values(";
auto it = auto_key_map_.find(name.data());
for (auto i = 0; i < SIZE; ++i) {
std::string field_name = iguana::get_name<T>(i).data();
if(it!=auto_key_map_.end()&&it->second==field_name)
continue;
values += "?";
fields += field_name;
if (i < SIZE - 1) {
fields += ", ";
values += ", ";
}
else {
fields += ")";
values += ")";
}
}
append(sql, fields, values);
return sql;
}
sqlite3* handle_ = nullptr;
sqlite3_stmt* stmt_ = nullptr;
std::map<std::string, std::string> auto_key_map_;
std::string last_error_;
// std::string auto_key_ = "";
};
}
#endif //ORM_SQLITE_HPP