aboutsummaryrefslogtreecommitdiff
path: root/odb/pgsql/connection.cxx
blob: dcc841b2b3144bf7a959355c0c092b4000d21b75 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
// file      : odb/pgsql/connection.cxx
// copyright : Copyright (c) 2005-2015 Code Synthesis Tools CC
// license   : GNU GPL v2; see accompanying LICENSE file

#include <new>     // std::bad_alloc
#include <string>
#include <cstring> // std::strcmp
#include <cstdlib> // std::atol

#include <libpq-fe.h>

#include <odb/pgsql/database.hxx>
#include <odb/pgsql/connection.hxx>
#include <odb/pgsql/transaction.hxx>
#include <odb/pgsql/error.hxx>
#include <odb/pgsql/exceptions.hxx>
#include <odb/pgsql/statement-cache.hxx>

using namespace std;

extern "C" void
odb_pgsql_process_notice (void*, const char*)
{
}

namespace odb
{
  namespace pgsql
  {
    connection::
    connection (connection_factory& cf)
        : odb::connection (cf), failed_ (false)
    {
      database_type& db (database ());
      handle_.reset (PQconnectdb (db.conninfo ().c_str ()));

      if (handle_ == 0)
        throw bad_alloc ();
      else if (PQstatus (handle_) == CONNECTION_BAD)
        throw database_exception (PQerrorMessage (handle_));

      init ();
    }

    connection::
    connection (connection_factory& cf, PGconn* handle)
        : odb::connection (cf), handle_ (handle), failed_ (false)
    {
      init ();
    }

    void connection::
    init ()
    {
      // Establish whether date/time values are represented as
      // 8-byte integers.
      //
      if (strcmp (PQparameterStatus (handle_, "integer_datetimes"), "on") != 0)
        throw database_exception ("unsupported binary format for PostgreSQL "
                                  "date-time SQL types");

      // Suppress server notifications to stdout.
      //
      PQsetNoticeProcessor (handle_, &odb_pgsql_process_notice, 0);

      // Create statement cache.
      //
      statement_cache_.reset (new statement_cache_type (*this));
    }

    connection::
    ~connection ()
    {
      // Destroy prepared query statements before freeing the connections.
      //
      recycle ();
      clear_prepared_map ();
    }

    transaction_impl* connection::
    begin ()
    {
      return new transaction_impl (connection_ptr (inc_ref (this)));
    }

    unsigned long long connection::
    execute (const char* s, std::size_t n)
    {
      // The string may not be '\0'-terminated.
      //
      string str (s, n);

      {
        odb::tracer* t;
        if ((t = transaction_tracer ()) ||
            (t = tracer ()) ||
            (t = database ().tracer ()))
          t->execute (*this, str.c_str ());
      }

      auto_handle<PGresult> h (PQexec (handle_, str.c_str ()));

      unsigned long long count (0);

      if (!is_good_result (h))
        translate_error (*this, h);
      else if (PGRES_TUPLES_OK == PQresultStatus (h))
        count = static_cast<unsigned long long> (PQntuples (h));
      else
      {
        const char* s (PQcmdTuples (h));

        if (s[0] != '\0' && s[1] == '\0')
          count = static_cast<unsigned long long> (s[0] - '0');
        else
          count = static_cast<unsigned long long> (atol (s));
      }

      return count;
    }

    // connection_factory
    //
    connection_factory::
    ~connection_factory ()
    {
    }

    void connection_factory::
    database (database_type& db)
    {
      odb::connection_factory::db_ = &db;
      db_ = &db;
    }
  }
}