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Store primary key definitions for modified tables in changesets. Add the sqlite3changeset_pk() API to extract this data from a changeset iterator.

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FossilOrigin-Name: 54298ee5ed183d1f1c49524f25e8ae1407f3d4b5
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dan
2011-03-24 11:22:59 +00:00
parent 9a48bf528d
commit 244593c846
8 changed files with 132 additions and 75 deletions
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31
ext/session/sqlite3session.h
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@ -341,6 +341,37 @@ int sqlite3changeset_op(
int *pbIndirect /* OUT: True for an 'indirect' change */
);
/*
** CAPI3REF: Obtain The Primary Key Definition Of A Table
**
** For each modified table, a changeset includes the following:
**
** <ul>
** <li> The number of columns in the table, and
** <li> Which of those columns make up the tables PRIMARY KEY.
** </ul>
**
** This function is used to find which columns comprise the PRIMARY KEY of
** the table modified by the change that iterator pIter currently points to.
** If successful, *pabPK is set to point to an array of nCol entries, where
** nCol is the number of columns in the table. Elements of *pabPK are set to
** 0x01 if the corresponding column is part of the tables primary key, or
** 0x00 if it is not.
**
** If argumet pnCol is not NULL, then *pnCol is set to the number of columns
** in the table.
**
** If this function is called when the iterator does not point to a valid
** entry, SQLITE_MISUSE is returned and the output variables zeroed. Otherwise,
** SQLITE_OK is returned and the output variables populated as described
** above.
*/
int sqlite3changeset_pk(
sqlite3_changeset_iter *pIter, /* Iterator object */
unsigned char **pabPK, /* OUT: Array of boolean - true for PK cols */
int *pnCol /* OUT: Number of entries in output array */
);
/*
** CAPI3REF: Obtain old.* Values From A Changeset Iterator
**