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