CODEWITHSUNDEEP
c++databasepostgresqllibpqxx
Roman Dryndik
Roman Dryndik

Reputation: 1184

Trouble inserting data to PostgreSQL via libpqxx

I have a database which is called mydb with a table People(id, name).

I want to insert a row to this table using pqxx C++ interface.

The SQL query is quite simple INSERT INTO people (id, name) VALUES (1, "Bob");

The C++ code is here:

#include <pqxx/pqxx>

using namespace std;

int main(int, char *argv[])
{
  pqxx::connection conn( /* some stuff here */ );

  conn.prepare("insert_to_people", "insert into people (id, name) values ($1, $2);");
  pqxx::work pq(conn);

  pq.prepared("insert_to_people")(1)("Bob").exec();
  pq.commit();

  return 0;
}

But I get the following exception:

terminate called after throwing an instance of 'pqxx::usage_error'
  what():  Too many arguments for prepared statement insert_to_people: expected 0, received 2
Aborted (core dumped)

What is wrong?

Upvotes: 2

Views: 3539

Answers (1)

Greg
Greg

Reputation: 6759

It has been a few years since I used c++! Looking at the doc it seems that the argument types need to be declared? Maybe this will work:

conn.prepare("insert_to_people", "insert into people (id, name) values ($1, $2)")("integer")("varchar", pqxx::prepare::treat_string);

Also, there was a trailing ; in the query. I don't think it will hurt but it is not needed.

-g

Upvotes: 4

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