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Add experimental API sqlite3session_diff().

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FossilOrigin-Name: c4340b2ea2115ad97dcac036f9034e132ab789e5
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dan
2015-04-08 16:01:12 +00:00
parent 159e6b304c
commit cf8e91442d
7 changed files with 636 additions and 73 deletions
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57
ext/session/sqlite3session.h
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@ -273,6 +273,63 @@ int sqlite3session_changeset(
void **ppChangeset /* OUT: Buffer containing changeset */
);
/*
** CAPI3REF: Load The Difference Between Tables Into A Session
**
** If it is not already attached to the session object passed as the first
** argument, this function attaches table zTbl in the same manner as the
** [sqlite3session_attach()] function. If zTbl does not exist, or if it
** does not have a primary key, this function is a no-op (but does not return
** an error).
**
** Argument zFromDb must be the name of a database ("main", "temp" etc.)
** attached to the same database handle as the session object that contains
** a table compatible with the table attached to the session by this function.
** A table is considered compatible if it:
**
** <ul>
** <li> Has the same name,
** <li> Has the same set of columns declared in the same order, and
** <li> Has the same PRIMARY KEY definition.
** </ul>
**
** This function adds a set of changes to the session object that could be
** used to update the table in database zFrom (call this the "from-table")
** so that its content is the same as the table attached to the session
** object (call this the "to-table"). Specifically:
**
** <ul>
** <li> For each row (primary key) that exists in the to-table but not in
** the from-table, an INSERT record is added to the session object.
**
** <li> For each row (primary key) that exists in the to-table but not in
** the from-table, a DELETE record is added to the session object.
**
** <li> For each row (primary key) that exists in both tables, but features
** different in each, an UPDATE record is added to the session.
** </ul>
**
** To clarify, if this function is called and then a changeset constructed
** using [sqlite3session_changeset()], then after applying that changeset to
** database zFrom the contents of the two compatible tables would be
** identical.
**
** It an error if database zFrom does not exist or does not contain the
** required compatible table.
**
** If the operation successful, SQLITE_OK is returned. Otherwise, an SQLite
** error code. In this case, if argument pzErrMsg is not NULL, *pzErrMsg
** may be set to point to a buffer containing an English language error
** message. It is the responsibility of the caller to free this buffer using
** sqlite3_free().
*/
int sqlite3session_diff(
sqlite3_session *pSession,
const char *zFromDb,
const char *zTbl,
char **pzErrMsg
);
/*
** CAPI3REF: Generate A Patchset From A Session Object