Question

我正在创建一个事务，我想在一个表中更新用户并删除属于该用户的另一个数据。但只执行第一个查询，而不执行第二个查询。在第二个查询中的delete语句code是逗号分隔的std :: string。

pqxx::connection c(connectionString);

try {
    pqxx::work w(c);
    pqxx::result r;

    c.prepare("user", "update user set started = null, finished = null, task = $1 where id = $2");
    r = w.prepared("user")(task)(email).exec();

    c.prepare("belongings", "delete from belongings where id in " \
        "(select id from info where code in ($1) and id = $2)");
    r = w.prepared("belongings")(code)(id).exec();

    w.commit();
}

我读了this SO-thread，解释了如何在commit（）之前运行多个查询。所以我必须在第二个删除语句中犯错，但无法找到原因。

Answer 1

code参数被解释为单个文字。您可以尝试使用any(array expression),的替代语法，例如：

code = "{abc,def}";     // instead of code = "'abc','def'"
...

c.prepare("belongings", "delete from belongings where id in " \
    "(select id from info where code = any ($1) and id = $2)");
r = w.prepared("belongings")(code)(id).exec();

删除语句未在postgresql中执行

1 个答案: