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Add an experimental "pointer type" parameter to sqlite3_bind_pointer(),

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sqlite3_result_pointer(), and sqlite3_value_pointer().  The pointer type is
a string that must compare equal using strcmp() or else the pointer comes
through as a NULL.

FossilOrigin-Name: 211cce04e97d2e325a6ea3e99738fc71115d673dc13daeffb03ac3140deb11de
This commit is contained in:
drh
2017-07-17 00:40:19 +00:00
parent fe8eadc94d
commit ae3ec3f920
10 changed files with 66 additions and 47 deletions
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7
ext/misc/remember.c
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@ -21,8 +21,9 @@
** UPDATE counterTab SET cnt=remember(cnt,$PTR)+1 WHERE id=$ID
**
** Prepare the above statement once. Then to use it, bind the address
** of the output variable to $PTR (using sqlite3_bind_pointer()) and
** bind the id of the counter to $ID and run the prepared statement.
** of the output variable to $PTR using sqlite3_bind_pointer() with a
** pointer type of "carray" and bind the id of the counter to $ID and
** run the prepared statement.
**
** One can imagine doing similar things with floating-point values and
** strings, but this demonstration extension will stick to using just
@ -47,7 +48,7 @@ static void rememberFunc(
sqlite3_int64 *ptr;
assert( argc==2 );
v = sqlite3_value_int64(argv[0]);
ptr = sqlite3_value_pointer(argv[1]);
ptr = sqlite3_value_pointer(argv[1], "carray");
if( ptr ) *ptr = v;
sqlite3_result_int64(pCtx, v);
}