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Change the IFNULL and NVL functions to COALESCE. Change MIN and MAX so that

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they require at least one argument. (CVS 404)

FossilOrigin-Name: 7d86749d4a78d05930bae2b6491d9428f06fe836
This commit is contained in:
drh
2002-02-28 03:14:18 +00:00
parent 89425d5e02
commit fbc990826c
4 changed files with 37 additions and 30 deletions
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45
src/func.c
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@@ -16,7 +16,7 @@
** sqliteRegisterBuildinFunctions() found at the bottom of the file.
** All other code has file scope.
**
** $Id: func.c,v 1.9 2002/02/28 03:04:48 drh Exp $
** $Id: func.c,v 1.10 2002/02/28 03:14:18 drh Exp $
*/
#include <ctype.h>
#include <math.h>
@@ -168,15 +168,18 @@ static void lowerFunc(sqlite_func *context, int argc, const char **argv){
}
/*
** Implementation of the IFNULL() and NVL() functions. (both do the
** same thing. They return their first argument if it is not NULL or
** their second argument if the first is NULL.
** Implementation of the IFNULL(), NVL(), and COALESCE() functions.
** All three do the same thing. They return the first argument
** non-NULL argument.
*/
static void ifnullFunc(sqlite_func *context, int argc, const char **argv){
const char *z;
assert( argc==2 );
z = argv[0] ? argv[0] : argv[1];
sqlite_set_result_string(context, z, -1);
int i;
for(i=0; i<argc; i++){
if( argv[i] ){
sqlite_set_result_string(context, argv[i], -1);
break;
}
}
}
/*
@@ -351,17 +354,21 @@ void sqliteRegisterBuildinFunctions(sqlite *db){
int nArg;
void (*xFunc)(sqlite_func*,int,const char**);
} aFuncs[] = {
{ "min", -1, minFunc },
{ "max", -1, maxFunc },
{ "length", 1, lengthFunc },
{ "substr", 3, substrFunc },
{ "abs", 1, absFunc },
{ "round", 1, roundFunc },
{ "round", 2, roundFunc },
{ "upper", 1, upperFunc },
{ "lower", 1, lowerFunc },
{ "ifnull", 2, ifnullFunc },
{ "nvl", 2, ifnullFunc },
{ "min", -1, minFunc },
{ "min", 0, 0 },
{ "max", -1, maxFunc },
{ "max", 0, 0 },
{ "length", 1, lengthFunc },
{ "substr", 3, substrFunc },
{ "abs", 1, absFunc },
{ "round", 1, roundFunc },
{ "round", 2, roundFunc },
{ "upper", 1, upperFunc },
{ "lower", 1, lowerFunc },
{ "coalesce", -1, ifnullFunc },
{ "coalesce", 0, 0 },
{ "coalesce", 1, 0 },
};
static struct {
char *zName;