odb/transaction.hxx


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
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162

// file      : odb/transaction.hxx
// copyright : Copyright (c) 2009-2012 Code Synthesis Tools CC
// license   : GNU GPL v2; see accompanying LICENSE file

#ifndef ODB_TRANSACTION_HXX
#define ODB_TRANSACTION_HXX

#include <odb/pre.hxx>

#include <odb/forward.hxx>

#include <odb/details/export.hxx>
#include <odb/details/unique-ptr.hxx>

namespace odb
{
  class transaction_impl;

  class LIBODB_EXPORT transaction
  {
  public:
    typedef odb::database database_type;
    typedef odb::connection connection_type;

    // If the second argument is false, then this transaction is not made
    // the current transaction of the thread.
    //
    explicit
    transaction (transaction_impl*, bool make_current = true);

    // Unless the transaction has already been finalized (explicitly
    // committed or rolled back), the destructor will roll it back.
    //
    ~transaction ();

    // Unless the current transaction has already been finalized (explicitly
    // committed or rolled back), reset will roll it back. If the second
    // argument is false, then this transaction is not made the current
    // transaction of the thread.
    //
    void
    reset (transaction_impl*, bool make_current = true);

    void
    commit ();

    void
    rollback ();

    // Return the database this transaction is on.
    //
    database_type&
    database ();

    // Return the connection this transaction is on.
    //
    connection_type&
    connection ();

  public:
    // Return true if there is a transaction in effect.
    //
    static bool
    has_current ();

    // Return current transaction or throw if there is no transaction
    // in effect.
    //
    static transaction&
    current ();

    // Set the current thread's transaction.
    //
    static void
    current (transaction&);

    // Revert to the no transaction in effect state for the current thread.
    //
    static void
    reset_current ();

    // SQL statement tracing.
    //
  public:
    typedef odb::tracer tracer_type;

    void
    tracer (tracer_type&);

    void
    tracer (tracer_type*);

    tracer_type*
    tracer () const;

  public:
    transaction_impl&
    implementation ();

    // Copying or assignment of transactions is not supported.
    //
  private:
    transaction (const transaction&);
    transaction& operator= (const transaction&);

  protected:
    bool finalized_;
    details::unique_ptr<transaction_impl> impl_;
  };

  class LIBODB_EXPORT transaction_impl
  {
  public:
    typedef odb::database database_type;
    typedef odb::connection connection_type;

    virtual
    ~transaction_impl ();

    virtual void
    start () = 0;

    virtual void
    commit () = 0;

    virtual void
    rollback () = 0;

    database_type&
    database ()
    {
      return database_;
    }

    connection_type&
    connection ()
    {
      return *connection_;
    }

  protected:
    transaction_impl (database_type& db)
        : database_ (db), connection_ (0)
    {
    }

    transaction_impl (database_type& db, connection_type& c)
        : database_ (db), connection_ (&c)
    {
    }

  protected:
    database_type& database_;
    connection_type* connection_;
  };
}

#include <odb/transaction.ixx>

#include <odb/post.hxx>

#endif // ODB_TRANSACTION_HXX