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Overview
Comment:Enhance documentation of sqlite3_snapshot_open() to explain that the database connection must have participated in at least one read operation prior to the beginning of the transaction for which the snapshot is to be opened. Add test cases for this fact.
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SHA1: 33dd671cb9c17f08dbc61aed91e80eaeb84bfaf5
User & Date: drh 2016-02-27 14:00:07
Context
2016-02-27
14:04
Fix a requirement mark to conform to a typo fix in the documentation. check-in: d1392c62 user: drh tags: trunk
14:00
Enhance documentation of sqlite3_snapshot_open() to explain that the database connection must have participated in at least one read operation prior to the beginning of the transaction for which the snapshot is to be opened. Add test cases for this fact. check-in: 33dd671c user: drh tags: trunk
00:21
Add 'Replace.exe' to the MSVC clean target. check-in: c2277fab user: mistachkin tags: trunk
Changes
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Changes to src/sqlite.h.in.

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** ^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].  




**
** 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,
  const char *zSchema,







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** ^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,
  const char *zSchema,

Changes to test/snapshot.test.

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} {}
do_test 6.3 {
  sqlite3 db2 test.db 
  db2 eval "PRAGMA user_version ; BEGIN"
  sqlite3_snapshot_open db2 main $::snapshot
  db2 eval { SELECT * FROM x1 }
} {z zz zzz}




















sqlite3_snapshot_free $snapshot

finish_test







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} {}
do_test 6.3 {
  sqlite3 db2 test.db 
  db2 eval "PRAGMA user_version ; BEGIN"
  sqlite3_snapshot_open db2 main $::snapshot
  db2 eval { SELECT * FROM x1 }
} {z zz zzz}
do_test 6.4 {
  db2 close
  sqlite3 db2 test.db 
  db2 eval "PRAGMA application_id"
  db2 eval "BEGIN"
  sqlite3_snapshot_open db2 main $::snapshot
  db2 eval { SELECT * FROM x1 }
} {z zz zzz}

# EVIDENCE-OF: R-55491-50411 A snapshot will fail to open if the
# database connection D has not previously completed at least one read
# operation against the database file.
#
do_test 6.5 {
  db2 close
  sqlite3 db2 test.db 
  db2 eval "BEGIN"
  list [catch {sqlite3_snapshot_open db2 main $::snapshot} msg] $msg
} {1 SQLITE_ERROR}

sqlite3_snapshot_free $snapshot

finish_test