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Improved comments. Slightly tighter implementation, but no big changes.

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FossilOrigin-Name: a1b3f28569f2a8d82b2931527fdfe191b421f3e1ea18ee30e04211e1ad645993
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drh
2018-01-12 23:18:38 +00:00
parent ce2fbd1b02
commit 41fb367a2c
6 changed files with 34 additions and 21 deletions
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src/sqlite.h.in
+7 -2
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@@ -4850,8 +4850,13 @@ SQLITE_DEPRECATED int sqlite3_memory_alarm(void(*)(void*,sqlite3_int64,int),
** ^Within the [xUpdate] method of a [virtual table], the
** sqlite3_value_nochange(X) interface returns true if and only if
** the column corresponding to X is unchanged by the UPDATE operation
** and the [xColumn] method had previously queried [sqlite3_vtab_nochange()]
** for that column and returned a NULL as a result.
** that the xUpdate method call was invoked to implement and if
** and the prior [xColumn] method call that was invoked to extracted
** the value for that column returned without setting a result (probably
** because it queried [sqlite3_vtab_nochange()] and found that the column
** was unchanging). If sqlite3_value_nochange(X) is invoked anywhere other
** than within an [xUpdate] method call for an UPDATE statement, then
** the return value is arbitrary and meaningless.
**
** Please pay particular attention to the fact that the pointer returned
** from [sqlite3_value_blob()], [sqlite3_value_text()], or