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-/*
-** 2016-08-09
-**
-** The author disclaims copyright to this source code. In place of
-** a legal notice, here is a blessing:
-**
-** May you do good and not evil.
-** May you find forgiveness for yourself and forgive others.
-** May you share freely, never taking more than you give.
-**
-*************************************************************************
-**
-** This file demonstrates how to create an SQL function that is a pass-through
-** for integer values (it returns a copy of its argument) but also saves the
-** value that is passed through into a C-language variable. The address of
-** the C-language variable is supplied as the second argument.
-**
-** This allows, for example, a counter to incremented and the original
-** value retrieved, atomically, using a single statement:
-**
-** 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() with a
-** pointer type of "carray" and bind the id of the counter to $ID and
-** run the prepared statement.
-**
-** This implementation of the remember() function uses a "carray"
-** pointer so that it can share pointers with the carray() extension.
-**
-** One can imagine doing similar things with floating-point values and
-** strings, but this demonstration extension will stick to using just
-** integers.
-*/
-#include "sqlite3ext.h"
-SQLITE_EXTENSION_INIT1
-#include <assert.h>
-
-/*
-** remember(V,PTR)
-**
-** Return the integer value V. Also save the value of V in a
-** C-language variable whose address is PTR.
-*/
-static void rememberFunc(
- sqlite3_context *pCtx,
- int argc,
- sqlite3_value **argv
-){
- sqlite3_int64 v;
- sqlite3_int64 *ptr;
- assert( argc==2 );
- v = sqlite3_value_int64(argv[0]);
- ptr = sqlite3_value_pointer(argv[1], "carray");
- if( ptr ) *ptr = v;
- sqlite3_result_int64(pCtx, v);
-}
-
-#ifdef _WIN32
-__declspec(dllexport)
-#endif
-int sqlite3_remember_init(
- sqlite3 *db,
- char **pzErrMsg,
- const sqlite3_api_routines *pApi
-){
- int rc = SQLITE_OK;
- SQLITE_EXTENSION_INIT2(pApi);
- rc = sqlite3_create_function(db, "remember", 2, SQLITE_UTF8, 0,
- rememberFunc, 0, 0);
- return rc;
-}