Update SQLite v3.34.0

src/3rdparty/sqlite/sqlite3.h

@@ -123,9 +123,9 @@ extern "C" {
 ** [sqlite3_libversion_number()], [sqlite3_sourceid()],
 ** [sqlite_version()] and [sqlite_source_id()].
 */
-#define SQLITE_VERSION        "3.33.0"
+#define SQLITE_VERSION        "3.34.0"
-#define SQLITE_VERSION_NUMBER 3033000
+#define SQLITE_VERSION_NUMBER 3034000
-#define SQLITE_SOURCE_ID      "2020-08-14 13:23:32 fca8dc8b578f215a969cd899336378966156154710873e68b3d9ac5881b0ff3f"
+#define SQLITE_SOURCE_ID      "2020-12-01 16:14:00 a26b6597e3ae272231b96f9982c3bcc17ddec2f2b6eb4df06a224b91089fed5b"
 
 /*
 ** CAPI3REF: Run-Time Library Version Numbers
@@ -504,6 +504,7 @@ SQLITE_API int sqlite3_exec(
 #define SQLITE_IOERR_COMMIT_ATOMIC     (SQLITE_IOERR | (30<<8))
 #define SQLITE_IOERR_ROLLBACK_ATOMIC   (SQLITE_IOERR | (31<<8))
 #define SQLITE_IOERR_DATA              (SQLITE_IOERR | (32<<8))
+#define SQLITE_IOERR_CORRUPTFS         (SQLITE_IOERR | (33<<8))
 #define SQLITE_LOCKED_SHAREDCACHE      (SQLITE_LOCKED |  (1<<8))
 #define SQLITE_LOCKED_VTAB             (SQLITE_LOCKED |  (2<<8))
 #define SQLITE_BUSY_RECOVERY           (SQLITE_BUSY   |  (1<<8))
@@ -6186,6 +6187,57 @@ SQLITE_API const char *sqlite3_db_filename(sqlite3 *db, const char *zDbName);
 */
 SQLITE_API int sqlite3_db_readonly(sqlite3 *db, const char *zDbName);
 
+/*
+** CAPI3REF: Determine the transaction state of a database
+** METHOD: sqlite3
+**
+** ^The sqlite3_txn_state(D,S) interface returns the current
+** [transaction state] of schema S in database connection D.  ^If S is NULL,
+** then the highest transaction state of any schema on database connection D
+** is returned.  Transaction states are (in order of lowest to highest):
+** <ol>
+** <li value="0"> SQLITE_TXN_NONE
+** <li value="1"> SQLITE_TXN_READ
+** <li value="2"> SQLITE_TXN_WRITE
+** </ol>
+** ^If the S argument to sqlite3_txn_state(D,S) is not the name of
+** a valid schema, then -1 is returned.
+*/
+SQLITE_API int sqlite3_txn_state(sqlite3*,const char *zSchema);
+
+/*
+** CAPI3REF: Allowed return values from [sqlite3_txn_state()]
+** KEYWORDS: {transaction state}
+**
+** These constants define the current transaction state of a database file.
+** ^The [sqlite3_txn_state(D,S)] interface returns one of these
+** constants in order to describe the transaction state of schema S
+** in [database connection] D.
+**
+** <dl>
+** [[SQLITE_TXN_NONE]] <dt>SQLITE_TXN_NONE</dt>
+** <dd>The SQLITE_TXN_NONE state means that no transaction is currently
+** pending.</dd>
+**
+** [[SQLITE_TXN_READ]] <dt>SQLITE_TXN_READ</dt>
+** <dd>The SQLITE_TXN_READ state means that the database is currently
+** in a read transaction.  Content has been read from the database file
+** but nothing in the database file has changed.  The transaction state
+** will advanced to SQLITE_TXN_WRITE if any changes occur and there are
+** no other conflicting concurrent write transactions.  The transaction
+** state will revert to SQLITE_TXN_NONE following a [ROLLBACK] or
+** [COMMIT].</dd>
+**
+** [[SQLITE_TXN_WRITE]] <dt>SQLITE_TXN_WRITE</dt>
+** <dd>The SQLITE_TXN_WRITE state means that the database is currently
+** in a write transaction.  Content has been written to the database file
+** but has not yet committed.  The transaction state will change to
+** to SQLITE_TXN_NONE at the next [ROLLBACK] or [COMMIT].</dd>
+*/
+#define SQLITE_TXN_NONE  0
+#define SQLITE_TXN_READ  1
+#define SQLITE_TXN_WRITE 2
+
 /*
 ** CAPI3REF: Find the next prepared statement
 ** METHOD: sqlite3
@@ -7712,7 +7764,8 @@ SQLITE_API int sqlite3_test_control(int op, ...);
 #define SQLITE_TESTCTRL_RESULT_INTREAL          27
 #define SQLITE_TESTCTRL_PRNG_SEED               28
 #define SQLITE_TESTCTRL_EXTRA_SCHEMA_CHECKS     29
-#define SQLITE_TESTCTRL_LAST                    29  /* Largest TESTCTRL */
+#define SQLITE_TESTCTRL_SEEK_COUNT              30
+#define SQLITE_TESTCTRL_LAST                    30  /* Largest TESTCTRL */
 
 /*
 ** CAPI3REF: SQL Keyword Checking
@@ -9192,10 +9245,11 @@ SQLITE_API int sqlite3_vtab_on_conflict(sqlite3 *);
 ** CAPI3REF: Determine If Virtual Table Column Access Is For UPDATE
 **
 ** If the sqlite3_vtab_nochange(X) routine is called within the [xColumn]
-** method of a [virtual table], then it returns true if and only if the
+** method of a [virtual table], then it might return true if the
 ** column is being fetched as part of an UPDATE operation during which the
-** column value will not change.  Applications might use this to substitute
+** column value will not change.  The virtual table implementation can use
-** a return value that is less expensive to compute and that the corresponding
+** this hint as permission to substitute a return value that is less
+** expensive to compute and that the corresponding
 ** [xUpdate] method understands as a "no-change" value.
 **
 ** If the [xColumn] method calls sqlite3_vtab_nochange() and finds that
@@ -9204,6 +9258,12 @@ SQLITE_API int sqlite3_vtab_on_conflict(sqlite3 *);
 ** any of the [sqlite3_result_int|sqlite3_result_xxxxx() interfaces].
 ** In that case, [sqlite3_value_nochange(X)] will return true for the
 ** same column in the [xUpdate] method.
+**
+** The sqlite3_vtab_nochange() routine is an optimization.  Virtual table
+** implementations should continue to give a correct answer even if the
+** sqlite3_vtab_nochange() interface were to always return false.  In the
+** current implementation, the sqlite3_vtab_nochange() interface does always
+** returns false for the enhanced [UPDATE FROM] statement.
 */
 SQLITE_API int sqlite3_vtab_nochange(sqlite3_context*);
 
@@ -9345,6 +9405,7 @@ SQLITE_API void sqlite3_stmt_scanstatus_reset(sqlite3_stmt*);
 
 /*
 ** CAPI3REF: Flush caches to disk mid-transaction
+** METHOD: sqlite3
 **
 ** ^If a write-transaction is open on [database connection] D when the
 ** [sqlite3_db_cacheflush(D)] interface invoked, any dirty
@@ -9377,6 +9438,7 @@ SQLITE_API int sqlite3_db_cacheflush(sqlite3*);
 
 /*
 ** CAPI3REF: The pre-update hook.
+** METHOD: sqlite3
 **
 ** ^These interfaces are only available if SQLite is compiled using the
 ** [SQLITE_ENABLE_PREUPDATE_HOOK] compile-time option.
@@ -9417,7 +9479,7 @@ SQLITE_API int sqlite3_db_cacheflush(sqlite3*);
 ** seventh parameter is the final rowid value of the row being inserted
 ** or updated. The value of the seventh parameter passed to the callback
 ** function is not defined for operations on WITHOUT ROWID tables, or for
-** INSERT operations on rowid tables.
+** DELETE operations on rowid tables.
 **
 ** The [sqlite3_preupdate_old()], [sqlite3_preupdate_new()],
 ** [sqlite3_preupdate_count()], and [sqlite3_preupdate_depth()] interfaces
@@ -9479,6 +9541,7 @@ SQLITE_API int sqlite3_preupdate_new(sqlite3 *, int, sqlite3_value **);
 
 /*
 ** CAPI3REF: Low-level system error code
+** METHOD: sqlite3
 **
 ** ^Attempt to return the underlying operating system error code or error
 ** number that caused the most recent I/O error or failure to open a file.