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Overview
Comment:Update documentation for sqlite3_snapshot_open(). No code changes.
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SHA1: 1dfa5234d3ee38c6af2d18a6294afa93232821e7
User & Date: drh 2016-04-08 19:44:31.621
Context
2016-04-09
14:36
Limit the number of digits shown in the "prereq" mask for ".wheretrace" debugging output. (check-in: 3686ed7413 user: drh tags: trunk)
2016-04-08
21:35
Attempt to treat the arguments to a table-valued function as if they occur in the ON clause of a LEFT JOIN rather than in the WHERE clause. But this causes undesirable behavior with generate_series, as demonstrated by test cases. This is an incremental check-in pending further work. (Leaf check-in: 00ac73a01c user: drh tags: tabfunc-in-left-join)
19:44
Update documentation for sqlite3_snapshot_open(). No code changes. (check-in: 1dfa5234d3 user: drh tags: trunk)
2016-04-07
21:14
Add test cases for ticket [7f7f8026eda387d544]. (check-in: 87aa9357fb user: drh tags: trunk)
Changes
Unified Diff Ignore Whitespace Patch
Changes to src/sqlite.h.in.
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  sqlite3_snapshot **ppSnapshot
);

/*
** CAPI3REF: Start a read transaction on an historical snapshot
** EXPERIMENTAL
**
** ^The [sqlite3_snapshot_open(D,S,P)] interface attempts to move the
** read transaction that is currently open on schema S of

** [database connection] D so that it refers to historical [snapshot] P.

** ^The [sqlite3_snapshot_open()] interface returns SQLITE_OK on success
** or an appropriate [error code] if it fails.
**
** ^In order to succeed, a call to [sqlite3_snapshot_open(D,S,P)] must be
** the first operation, apart from other sqlite3_snapshot_open() calls,


** following the [BEGIN] that starts a new read transaction.

** ^A [snapshot] will fail to open if it has been overwritten by a 
** [checkpoint].

** ^A [snapshot] will fail to open if the database connection D has not

** previously completed at least one read operation against the database 


** file.  (Hint: Run "[PRAGMA application_id]" against a newly opened
** database connection in order to make it ready to use snapshots.)
**
** The [sqlite3_snapshot_open()] interface is only available when the
** SQLITE_ENABLE_SNAPSHOT compile-time option is used.
*/
SQLITE_EXPERIMENTAL int sqlite3_snapshot_open(
  sqlite3 *db,








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  sqlite3_snapshot **ppSnapshot
);

/*
** CAPI3REF: Start a read transaction on an historical snapshot
** EXPERIMENTAL
**
** ^The [sqlite3_snapshot_open(D,S,P)] interface starts a
** read transaction for schema S of
** [database connection] D such that the read transaction
** refers to historical [snapshot] P, rather than the most
** recent change to the database.
** ^The [sqlite3_snapshot_open()] interface returns SQLITE_OK on success
** or an appropriate [error code] if it fails.
**
** ^In order to succeed, a call to [sqlite3_snapshot_open(D,S,P)] must be
** the first operation following the [BEGIN] that takes the schema S
** out of [autocommit mode].
** ^In other words, schema S must not currently be in
** a transaction for [sqlite3_snapshot_open(D,S,P)] to work, but the
** database connection D must be out of [autocommit mode].
** ^A [snapshot] will fail to open if it has been overwritten by a
** [checkpoint].
** ^(A call to [sqlite3_snapshot_open(D,S,P)] will fail if the
** database connection D does not know that the database file for
** schema S is in [WAL mode].  A database connection might not know
** that the database file is in [WAL mode] if there has been no prior
** I/O on that database connection, or if the database entered [WAL mode] 
** after the most recent I/O on the database connection.)^
** (Hint: Run "[PRAGMA application_id]" against a newly opened
** database connection in order to make it ready to use snapshots.)
**
** The [sqlite3_snapshot_open()] interface is only available when the
** SQLITE_ENABLE_SNAPSHOT compile-time option is used.
*/
SQLITE_EXPERIMENTAL int sqlite3_snapshot_open(
  sqlite3 *db,
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