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Add the sqlite3changeset_start_v2() - a new version of _start() that accepts a flags parameter - and a streaming equivalent to the sessions module. Also add the SQLITE_CHANGESETSTART_INVERT flag, used with start_v2() to invert a changeset while iterating through it.

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FossilOrigin-Name: cbedcb9aaefdfe00453efbdf0eac6c15e1f53bbe8fff2e7d534a5adf23be04f5
This commit is contained in:
dan
2018-10-20 13:48:09 +00:00
parent 9c18ef09a5
commit 46de072880
6 changed files with 143 additions and 29 deletions
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34
ext/session/sqlite3session.h
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@ -473,12 +473,38 @@ int sqlite3session_isempty(sqlite3_session *pSession);
** consecutively. There is no chance that the iterator will visit a change
** the applies to table X, then one for table Y, and then later on visit
** another change for table X.
**
** The behavior of sqlite3changeset_start_v2() and its streaming equivalent
** may be modified by passing a combination of
** [SQLITE_CHANGESETSTART_INVERT | supported flags] as the 4th parameter.
**
** Note that the sqlite3changeset_start_v2() API is still <b>experimental</b>
** and therefore subject to change.
*/
int sqlite3changeset_start(
sqlite3_changeset_iter **pp, /* OUT: New changeset iterator handle */
int nChangeset, /* Size of changeset blob in bytes */
void *pChangeset /* Pointer to blob containing changeset */
);
int sqlite3changeset_start_v2(
sqlite3_changeset_iter **pp, /* OUT: New changeset iterator handle */
int nChangeset, /* Size of changeset blob in bytes */
void *pChangeset, /* Pointer to blob containing changeset */
int flags /* SESSION_CHANGESETSTART_* flags */
);
/*
** CAPI3REF: Flags for sqlite3changeset_start_v2
**
** The following flags may passed via the 4th parameter to
** [sqlite3changeset_start_v2] and [sqlite3changeset_start_v2_strm]:
**
** <dt>SQLITE_CHANGESETAPPLY_INVERT <dd>
** Invert the changeset while iterating through it. This is equivalent to
** inverting a changeset using sqlite3changeset_invert() before applying it.
** It is an error to specify this flag with a patchset.
*/
#define SQLITE_CHANGESETSTART_INVERT 0x0002
/*
@ -1133,7 +1159,7 @@ int sqlite3changeset_apply_v2(
),
void *pCtx, /* First argument passed to xConflict */
void **ppRebase, int *pnRebase, /* OUT: Rebase data */
int flags /* Combination of SESSION_APPLY_* flags */
int flags /* SESSION_CHANGESETAPPLY_* flags */
);
/*
@ -1552,6 +1578,12 @@ int sqlite3changeset_start_strm(
int (*xInput)(void *pIn, void *pData, int *pnData),
void *pIn
);
int sqlite3changeset_start_v2_strm(
sqlite3_changeset_iter **pp,
int (*xInput)(void *pIn, void *pData, int *pnData),
void *pIn,
int flags
);
int sqlite3session_changeset_strm(
sqlite3_session *pSession,
int (*xOutput)(void *pOut, const void *pData, int nData),