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Added IFNULL and NVL functions. (CVS 401)

FossilOrigin-Name: c6a85c8ee3d653a294bcc033ac6cab2b6de06f96
This commit is contained in:
drh
2002-02-28 00:46:26 +00:00
parent 0bce8354b4
commit 3212e18238
3 changed files with 22 additions and 8 deletions

View File

@@ -16,7 +16,7 @@
** sqliteRegisterBuildinFunctions() found at the bottom of the file.
** All other code has file scope.
**
** $Id: func.c,v 1.6 2002/02/28 00:41:10 drh Exp $
** $Id: func.c,v 1.7 2002/02/28 00:46:26 drh Exp $
*/
#include <ctype.h>
#include <math.h>
@@ -165,6 +165,18 @@ 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.
*/
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);
}
/*
** An instance of the following structure holds the context of a
** sum() or avg() aggregate computation.
@@ -350,6 +362,8 @@ void sqliteRegisterBuildinFunctions(sqlite *db){
{ "round", 2, roundFunc },
{ "upper", 1, upperFunc },
{ "lower", 1, lowerFunc },
{ "ifnull", 2, ifnullFunc },
{ "nvl", 2, ifnullFunc },
};
static struct {
char *zName;