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Provide the SQLITE_DIRECTONLY flag for app-defined functions that prohibits

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the use of those functions within triggers or views.

FossilOrigin-Name: fc745845d8d76adc165575e2192f4176e3c28e614c72571d56f4011560499fe1
This commit is contained in:
drh
2019-08-15 20:04:09 +00:00
parent 725dd72400
commit 42d2fce7f5
11 changed files with 131 additions and 54 deletions
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13
src/sqlite.h.in
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@@ -4848,6 +4848,9 @@ int sqlite3_reset(sqlite3_stmt *pStmt);
** function that is not deterministic. The SQLite query planner is able to
** perform additional optimizations on deterministic functions, so use
** of the [SQLITE_DETERMINISTIC] flag is recommended where possible.
** ^The fourth parameter may also optionally include the [SQLITE_DIRECTONLY]
** flag, which if present prevents the function from being invoked from
** within VIEWs or TRIGGERs.
**
** ^(The fifth parameter is an arbitrary pointer. The implementation of the
** function can gain access to this pointer using [sqlite3_user_data()].)^
@@ -4965,8 +4968,16 @@ int sqlite3_create_window_function(
** [SQLITE_UTF8 | preferred text encoding] as the fourth argument
** to [sqlite3_create_function()], [sqlite3_create_function16()], or
** [sqlite3_create_function_v2()].
**
** The SQLITE_DETERMINISTIC flag means that the new function will always
** maps the same inputs into the same output. The abs() function is
** deterministic, for example, but randomblob() is not.
**
** The SQLITE_DIRECTONLY flag means that the function may only be invoked
** from top-level SQL, and cannot be used in VIEWs or TRIGGERs.
*/
#define SQLITE_DETERMINISTIC 0x800
#define SQLITE_DETERMINISTIC 0x000000800
#define SQLITE_DIRECTONLY 0x000080000
/*
** CAPI3REF: Deprecated Functions