通过libpqxx将数据插入PostgreSQL时出现问题



我有一个名为mydb的数据库,其中包含一个表People(id, name)

我想使用pqxx C++接口在此表中插入一行。

SQL查询非常简单INSERT INTO people (id, name) VALUES (1, "Bob");

C++代码在这里:

#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;
}

但我得到了以下例外:

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)

怎么了?

我使用c++已经有几年了!查看文档,似乎需要声明参数类型?也许这会奏效:

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

此外,还有一个拖尾;在查询中。我认为它不会痛,但它不是必需的。

-g

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