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#include <database/postgresql_engine.hpp>
#include <database/postgresql_statement.hpp>
#include <logger/logger.hpp>
PostgresqlEngine::PostgresqlEngine(PGconn*const conn):
conn(conn)
{}
PostgresqlEngine::~PostgresqlEngine()
{
PQfinish(this->conn);
}
std::unique_ptr<DatabaseEngine> PostgresqlEngine::open(const std::string& conninfo)
{
log_debug("trying to open: ", conninfo);
PGconn* con = PQconnectdb(conninfo.data());
if (!con)
{
log_error("Failed to allocate a Postgresql connection");
throw std::runtime_error("");
}
const auto status = PQstatus(con);
if (status != CONNECTION_OK)
{
const char* errmsg = PQerrorMessage(con);
log_error("Postgresql connection failed: ", errmsg);
throw std::runtime_error("failed to open connection.");
}
return std::make_unique<PostgresqlEngine>(con);
}
std::set<std::string> PostgresqlEngine::get_all_columns_from_table(const std::string& table_name)
{
const auto query = "SELECT column_name from information_schema.columns where table_name='" + table_name + "'";
auto statement = this->prepare(query);
std::set<std::string> columns;
while (statement->step() == StepResult::Row)
columns.insert(statement->get_column_text(0));
log_debug("found ", columns.size(), " columns.");
return columns;
}
std::tuple<bool, std::string> PostgresqlEngine::raw_exec(const std::string& query)
{
log_debug("raw_exec:", query);
PGresult* res = PQexec(this->conn, query.data());
auto res_status = PQresultStatus(res);
if (res_status != PGRES_COMMAND_OK)
return std::make_tuple(false, PQresultErrorMessage(res));
return std::make_tuple(true, std::string{});
}
std::unique_ptr<Statement> PostgresqlEngine::prepare(const std::string& query)
{
return std::make_unique<PostgresqlStatement>(query, this->conn);
}
void PostgresqlEngine::extract_last_insert_rowid(Statement& statement)
{
this->last_inserted_rowid = statement.get_column_int64(0);
}
std::string PostgresqlEngine::get_returning_id_sql_string(const std::string& col_name)
{
return " RETURNING " + col_name;
}
std::string PostgresqlEngine::id_column_type()
{
return "SERIAL";
}
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