C++ PQXX 工作事务崩溃

C++ pqxx work transaction crashing

本文关键字：崩溃 事务 工作 PQXX C++      更新时间：2023-10-16

我正在使用c ++ PostgreSQL libpqxx库，我不确定为什么我无法打开事务/非事务对象。

我的代码目前如下

#include <iostream>
#include <pqxx/pqxx>
using namespace std;
using namespace pqxx;
int main() {
// define variables
string params;
connection* pgsql;
string sql;
// db connection parameters
params = "dbname=dummy user=postgres password=postgres hostaddr=10.10.0.2 port=5431";
try {
// make connection
pgsql = new connection(params);
} catch(const exception &log) {
// connection failed
cerr << log.what() << endl;
}
// prepare sql
sql = " select * from categories where cat_idno = $1 ";
pgsql->prepare("categories", sql)("integer");
// execute transaction
// this bit doesn't work
work tr(pgsql);
result row = tr.prepared("categories")(1).exec();
tr.commit();
// disconnect
pgsql->disconnect();
}

它使与数据库的连接很好，并且也很好地准备了我的sql，但它无法编译(顺便说一句，我正在CentOS 5上编译(

g++ -o ./pgsqltest ./pgsqltest02.cpp -lpqxx

给我以下错误

./pgsqltest02.cpp: In function ‘int main()’:
./pgsqltest02.cpp:24: error: no matching function for call to ‘pqxx::transaction<read_committed, read_write>::transaction(pqxx::connection*&)’
/usr/include/pqxx/transaction.hxx:102: note: candidates are: pqxx::transaction<ISOLATIONLEVEL, READWRITE>::transaction(pqxx::connection_base&) [with pqxx::isolation_level ISOLATIONLEVEL = read_committed, pqxx::readwrite_policy READWRITE = read_write]
/usr/include/pqxx/transaction.hxx:97: note: pqxx::transaction<ISOLATIONLEVEL, READWRITE>::transaction(pqxx::connection_base&, const std::string&) [with pqxx::isolation_level ISOLATIONLEVEL = read_committed, pqxx::readwrite_policy READWRITE = read_write]
/usr/include/pqxx/transaction.hxx:87: note: pqxx::transaction<read_committed, read_write>::transaction(const pqxx::transaction<read_committed, read_write>&)

我不确定为什么会这样，也许我错过了一些非常明显的东西

该错误与编译命令有关，它需要指向libpqxx标头和二进制文件的其他参数。正确的编译命令是

g++ -o ./pgsqltest ./pgsqltest02.cpp -I /opt/libpqxx/include -L /opt/libpqxx/lib -lpq -lpqxx
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