pica/database/mysql/statement.cpp

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//SPDX-FileCopyrightText: 2023 Yury Gubich <blue@macaw.me>
//SPDX-License-Identifier: GPL-3.0-or-later
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#include "statement.h"
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#include "mysqld_error.h"
#include "database/exceptions.h"
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static uint64_t TIME_LENGTH = sizeof(MYSQL_TIME);
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DB::MySQL::Statement::Statement(MYSQL* connection, const char* statement):
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stmt(mysql_stmt_init(connection)),
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param()
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{
int result = mysql_stmt_prepare(stmt.get(), statement, strlen(statement));
if (result != 0)
throw std::runtime_error(std::string("Error preparing statement: ") + mysql_stmt_error(stmt.get()));
}
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void DB::MySQL::Statement::bind(void* value, enum_field_types type, bool usigned) {
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MYSQL_BIND& result = param.emplace_back();
std::memset(&result, 0, sizeof(result));
result.buffer_type = type;
result.buffer = value;
switch (type) {
case MYSQL_TYPE_STRING:
case MYSQL_TYPE_VAR_STRING:
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result.buffer_length = strlen(static_cast<char*>(value));
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break;
case MYSQL_TYPE_DATE:
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result.buffer_length = TIME_LENGTH;
break;
case MYSQL_TYPE_LONG:
case MYSQL_TYPE_LONGLONG:
case MYSQL_TYPE_SHORT:
case MYSQL_TYPE_TINY:
result.is_unsigned = usigned;
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break;
default:
throw std::runtime_error("Type: " + std::to_string(type) + " is not yet supported in bind");
break;
}
}
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void DB::MySQL::Statement::execute() {
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MYSQL_STMT* raw = stmt.get();
int result = mysql_stmt_bind_param(raw, param.data());
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if (result != 0)
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throw std::runtime_error(std::string("Error binding statement: ") + mysql_stmt_error(raw));
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result = mysql_stmt_execute(raw);
if (result != 0) {
int errcode = mysql_stmt_errno(raw);
std::string text = mysql_stmt_error(raw);
switch (errcode) {
case ER_DUP_ENTRY:
throw Duplicate("Error executing statement: " + text);
default:
throw std::runtime_error("Error executing statement: " + text);
}
}
}
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std::vector<std::vector<std::any>> DB::MySQL::Statement::fetchResult() {
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MYSQL_STMT* raw = stmt.get();
if (mysql_stmt_store_result(raw) != 0)
throw std::runtime_error(std::string("Error fetching statement result: ") + mysql_stmt_error(raw)); //TODO not sure if it's valid here
MYSQL_RES* meta = mysql_stmt_result_metadata(raw);
if (meta == nullptr)
throw std::runtime_error(std::string("Error fetching statement result: ") + mysql_stmt_error(raw)); //TODO not sure if it's valid here
std::unique_ptr<MYSQL_RES, ResDeleter> mt(meta);
unsigned int numColumns = mysql_num_fields(meta);
MYSQL_BIND bind[numColumns];
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std::memset(bind, 0, sizeof(bind));
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std::vector<std::any> line(numColumns);
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std::vector<long unsigned int> lengths(numColumns);
for (unsigned int i = 0; i < numColumns; ++i) {
MYSQL_FIELD *field = mysql_fetch_field_direct(meta, i);
switch (field->type) {
case MYSQL_TYPE_STRING:
case MYSQL_TYPE_VAR_STRING:
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case MYSQL_TYPE_VARCHAR: {
line[i] = std::string();
std::string& str = std::any_cast<std::string&>(line[i]);
str.resize(field->length);
bind[i].buffer = str.data();
} break;
case MYSQL_TYPE_TINY:
line[i] = uint8_t{0};
bind[i].buffer = &std::any_cast<std::string&>(line[i]);
break;
case MYSQL_TYPE_SHORT:
line[i] = uint16_t{0};
bind[i].buffer = &std::any_cast<std::string&>(line[i]);
break;
case MYSQL_TYPE_LONG:
line[i] = uint32_t{0};
bind[i].buffer = &std::any_cast<std::string&>(line[i]);
break;
case MYSQL_TYPE_LONGLONG:
line[i] = uint64_t{0};
bind[i].buffer = &std::any_cast<std::string&>(line[i]);
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break;
default:
throw std::runtime_error("Unsupported data fetching statement result " + std::to_string(field->type));
}
bind[i].buffer_type = field->type;
bind[i].buffer_length = field->length;
bind[i].length = &lengths[i];
}
if (mysql_stmt_bind_result(raw, bind) != 0)
throw std::runtime_error(std::string("Error binding on fetching statement result: ") + mysql_stmt_error(raw));
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std::vector<std::vector<std::any>> result;
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while (mysql_stmt_fetch(raw) == 0) {
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std::vector<std::any>& row = result.emplace_back(numColumns);
for (unsigned int i = 0; i < numColumns; ++i) {
switch (bind[i].buffer_type) {
case MYSQL_TYPE_STRING:
case MYSQL_TYPE_VAR_STRING:
case MYSQL_TYPE_VARCHAR: {
row[i] = std::string(std::any_cast<const std::string&>(line[i]).data(), lengths[i]);
} break;
case MYSQL_TYPE_TINY:
row[i] = std::any_cast<uint8_t>(line[i]);
break;
case MYSQL_TYPE_SHORT:
row[i] = std::any_cast<uint16_t>(line[i]);
break;
case MYSQL_TYPE_LONG:
row[i] = std::any_cast<uint32_t>(line[i]);
break;
case MYSQL_TYPE_LONGLONG:
row[i] = std::any_cast<uint64_t>(line[i]);
break;
default:
throw std::runtime_error("Unsupported data fetching statement result " + std::to_string(bind[i].buffer_type));
}
}
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}
return result;
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}
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