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Experimental "PRAGMA data_version" command for detecting when another process

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has changed the database file.

FossilOrigin-Name: 43db1f44bce5a0ee50197b95ab0d844540b69d86
This commit is contained in:
drh
2014-12-19 19:28:02 +00:00
parent 8e755e7e19
commit 9161856495
8 changed files with 59 additions and 16 deletions
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8
src/btree.h
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@@ -19,7 +19,7 @@
/* TODO: This definition is just included so other modules compile. It
** needs to be revisited.
*/
#define SQLITE_N_BTREE_META 10
#define SQLITE_N_BTREE_META 16
/*
** If defined as non-zero, auto-vacuum is enabled by default. Otherwise
@@ -134,6 +134,11 @@ int sqlite3BtreeNewDb(Btree *p);
** For example, the free-page-count field is located at byte offset 36 of
** the database file header. The incr-vacuum-flag field is located at
** byte offset 64 (== 36+4*7).
**
** The BTREE_DATA_VERSION value is not really a value stored in the header.
** It is a read-only number computed by the pager. But we merge it with
** the header value access routines since its access pattern is the same.
** Call it a "virtual meta value".
*/
#define BTREE_FREE_PAGE_COUNT 0
#define BTREE_SCHEMA_VERSION 1
@@ -144,6 +149,7 @@ int sqlite3BtreeNewDb(Btree *p);
#define BTREE_USER_VERSION 6
#define BTREE_INCR_VACUUM 7
#define BTREE_APPLICATION_ID 8
#define BTREE_DATA_VERSION 15 /* A virtual meta-value */
/*
** Values that may be OR'd together to form the second argument of an