A quotation from the docs "for me" : PQprepareSubmits a request to create a prepared statement with the given parameters, and waits for com-pletion.PGresult* PQprepare(PGconn * conn,const char* stmtName,const char* query,int nParams,const Oid* paramTypes);
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Соглашаюсь с условиями обработки персональных данных