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
|
.Dd January 24, 2024
.Dt SQLITE3CHANGEGROUP_ADD 3
.Os
.Sh NAME
.Nm sqlite3changegroup_add
.Nd add a changeset to a changegroup
.Sh SYNOPSIS
.In sqlite3.h
.Ft int
.Fo sqlite3changegroup_add
.Fa "sqlite3_changegroup*"
.Fa "int nData"
.Fa "void *pData"
.Fc
.Sh DESCRIPTION
Add all changes within the changeset (or patchset) in buffer pData
(size nData bytes) to the changegroup.
.Pp
If the buffer contains a patchset, then all prior calls to this function
on the same changegroup object must also have specified patchsets.
Or, if the buffer contains a changeset, so must have the earlier calls
to this function.
Otherwise, SQLITE_ERROR is returned and no changes are added to the
changegroup.
.Pp
Rows within the changeset and changegroup are identified by the values
in their PRIMARY KEY columns.
A change in the changeset is considered to apply to the same row as
a change already present in the changegroup if the two rows have the
same primary key.
.Pp
Changes to rows that do not already appear in the changegroup are simply
copied into it.
Or, if both the new changeset and the changegroup contain changes that
apply to a single row, the final contents of the changegroup depends
on the type of each change, as follows:
.Pp
Existing Change New Change Output Change
INSERT INSERT The new change is ignored.
This case does not occur if the new changeset was recorded immediately
after the changesets already added to the changegroup.
INSERT UPDATE The INSERT change remains in the changegroup.
The values in the INSERT change are modified as if the row was inserted
by the existing change and then updated according to the new change.
INSERT DELETE The existing INSERT is removed from the changegroup.
The DELETE is not added.
UPDATE INSERT The new change is ignored.
This case does not occur if the new changeset was recorded immediately
after the changesets already added to the changegroup.
UPDATE UPDATE The existing UPDATE remains within the changegroup.
It is amended so that the accompanying values are as if the row was
updated once by the existing change and then again by the new change.
UPDATE DELETE The existing UPDATE is replaced by the new DELETE within
the changegroup.
DELETE INSERT If one or more of the column values in the row inserted
by the new change differ from those in the row deleted by the existing
change, the existing DELETE is replaced by an UPDATE within the changegroup.
Otherwise, if the inserted row is exactly the same as the deleted row,
the existing DELETE is simply discarded.
DELETE UPDATE The new change is ignored.
This case does not occur if the new changeset was recorded immediately
after the changesets already added to the changegroup.
DELETE DELETE The new change is ignored.
This case does not occur if the new changeset was recorded immediately
after the changesets already added to the changegroup.
.Pp
If the new changeset contains changes to a table that is already present
in the changegroup, then the number of columns and the position of
the primary key columns for the table must be consistent.
If this is not the case, this function fails with SQLITE_SCHEMA.
Except, if the changegroup object has been configured with a database
schema using the sqlite3changegroup_schema() API, then it is possible
to combine changesets with different numbers of columns for a single
table, provided that they are otherwise compatible.
.Pp
If the input changeset appears to be corrupt and the corruption is
detected, SQLITE_CORRUPT is returned.
Or, if an out-of-memory condition occurs during processing, this function
returns SQLITE_NOMEM.
.Pp
In all cases, if an error occurs the state of the final contents of
the changegroup is undefined.
If no error occurs, SQLITE_OK is returned.
.Sh IMPLEMENTATION NOTES
These declarations were extracted from the
interface documentation at line 11900.
.Bd -literal
SQLITE_API int sqlite3changegroup_add(sqlite3_changegroup*, int nData, void *pData);
.Ed
|
