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Change functions to handle NULLs correctly. Added the NULLIF() function. (CVS 590)

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FossilOrigin-Name: 46ce1a9ab6e527958ebc757fa2175c488299cd84
This commit is contained in:
drh
2002-05-26 21:34:58 +00:00
parent f5905aa7be
commit 8912d106e1
4 changed files with 63 additions and 45 deletions
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14
manifest
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@@ -1,5 +1,5 @@
C NULL\svalues\sare\sdistinct.\s\sA\scomparison\sinvolving\sa\sNULL\sis\salways\sfalse.\nOperations\son\sa\sNULL\svalue\syield\sa\sNULL\sresult.\s\sThis\schange\smakes\sSQLite\noperate\smore\slike\sthe\sSQL\sspec,\sbut\sit\smay\sbreak\sexisting\sapplications\sthat\nassumed\sthe\sold\sbehavior.\s\sAll\sthe\sold\stests\spass\sbut\swe\sstill\sneed\sto\sadd\nnew\stests\sto\sbetter\sverify\sthe\snew\sbehavior.\s\sFix\sfor\sticket\s#44.\s(CVS\s589) C Change\sfunctions\sto\shandle\sNULLs\scorrectly.\s\sAdded\sthe\sNULLIF()\sfunction.\s(CVS\s590)
D 2002-05-26T20:54:33 D 2002-05-26T21:34:58
F Makefile.in 6291a33b87d2a395aafd7646ee1ed562c6f2c28c F Makefile.in 6291a33b87d2a395aafd7646ee1ed562c6f2c28c
F Makefile.template 4e11752e0b5c7a043ca50af4296ec562857ba495 F Makefile.template 4e11752e0b5c7a043ca50af4296ec562857ba495
F README a4c0ba11354ef6ba0776b400d057c59da47a4cc0 F README a4c0ba11354ef6ba0776b400d057c59da47a4cc0
@@ -24,7 +24,7 @@ F src/build.c 36e42718a7a94f554ea39508993378482f5335c7
F src/delete.c a2b098cbbf518e6b641847e26de85827793bc523 F src/delete.c a2b098cbbf518e6b641847e26de85827793bc523
F src/encode.c 346b12b46148506c32038524b95c4631ab46d760 F src/encode.c 346b12b46148506c32038524b95c4631ab46d760
F src/expr.c 1a7a2f5f2b7dd37659783cdb6efaac74a092ba71 F src/expr.c 1a7a2f5f2b7dd37659783cdb6efaac74a092ba71
F src/func.c a31dcba85bc2ecb9b752980289cf7e6cd0cafbce F src/func.c 16e994eea8cceb0cd451938e63d337f7d9d089bf
F src/hash.c 6a6236b89c8c060c65dabd300a1c8ce7c10edb72 F src/hash.c 6a6236b89c8c060c65dabd300a1c8ce7c10edb72
F src/hash.h dca065dda89d4575f3176e75e9a3dc0f4b4fb8b9 F src/hash.h dca065dda89d4575f3176e75e9a3dc0f4b4fb8b9
F src/insert.c 24b4e146319bada6f82a1d5eae6b38b3065d132f F src/insert.c 24b4e146319bada6f82a1d5eae6b38b3065d132f
@@ -51,7 +51,7 @@ F src/threadtest.c 81f0598e0f031c1bd506af337fdc1b7e8dff263f
F src/tokenize.c facec7dc0b4a13e17ad67702f548dac2f7c6a732 F src/tokenize.c facec7dc0b4a13e17ad67702f548dac2f7c6a732
F src/trigger.c f9adb404ea355a8be2c9cd9740794a898cf1096c F src/trigger.c f9adb404ea355a8be2c9cd9740794a898cf1096c
F src/update.c f68375173bf5338cae3e97012708e10f206aedd9 F src/update.c f68375173bf5338cae3e97012708e10f206aedd9
F src/util.c 707c30f8c13cddace7c08556ac450c0b786660b3 F src/util.c a9f6e6f03e8b7137204ac15b35a58f321e38037e
F src/vdbe.c caa269517b2392986c8f55401f272e76b9de82d9 F src/vdbe.c caa269517b2392986c8f55401f272e76b9de82d9
F src/vdbe.h b8706429131c14b307a07aab7e47f95a9da53610 F src/vdbe.h b8706429131c14b307a07aab7e47f95a9da53610
F src/where.c b054f2f23127bd57eb5f973bcd38764b875d73fe F src/where.c b054f2f23127bd57eb5f973bcd38764b875d73fe
@@ -135,7 +135,7 @@ F www/speed.tcl da8afcc1d3ccc5696cfb388a68982bc3d9f7f00f
F www/sqlite.tcl 8b5884354cb615049aed83039f8dfe1552a44279 F www/sqlite.tcl 8b5884354cb615049aed83039f8dfe1552a44279
F www/tclsqlite.tcl 1db15abeb446aad0caf0b95b8b9579720e4ea331 F www/tclsqlite.tcl 1db15abeb446aad0caf0b95b8b9579720e4ea331
F www/vdbe.tcl 2013852c27a02a091d39a766bc87cff329f21218 F www/vdbe.tcl 2013852c27a02a091d39a766bc87cff329f21218
P d8d04c14f18d1feba89ccea0be70530a18248c51 P 9051173742f1b0e15a809d12a0c9c98fd2c4614d
R 2ee233b2a9ebb3e4a8fe3e93b3747a0c R 0620e522ec88d7386c2177fd29ebfac3
U drh U drh
Z f507bf5d6b83b961339e312ca54783e8 Z 0624defcbccb679d773bc9ffe5a1ecda

2
manifest.uuid
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@@ -1 +1 @@
9051173742f1b0e15a809d12a0c9c98fd2c4614d 46ce1a9ab6e527958ebc757fa2175c488299cd84

88
src/func.c
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@@ -16,7 +16,7 @@
** sqliteRegisterBuildinFunctions() found at the bottom of the file. ** sqliteRegisterBuildinFunctions() found at the bottom of the file.
** All other code has file scope. ** All other code has file scope.
** **
** $Id: func.c,v 1.16 2002/04/20 14:24:42 drh Exp $ ** $Id: func.c,v 1.17 2002/05/26 21:34:58 drh Exp $
*/ */
#include <ctype.h> #include <ctype.h>
#include <math.h> #include <math.h>
@@ -33,7 +33,9 @@ static void minFunc(sqlite_func *context, int argc, const char **argv){
if( argc==0 ) return; if( argc==0 ) return;
zBest = argv[0]; zBest = argv[0];
if( zBest==0 ) return;
for(i=1; i<argc; i++){ for(i=1; i<argc; i++){
if( argv[i]==0 ) return;
if( sqliteCompare(argv[i], zBest)<0 ){ if( sqliteCompare(argv[i], zBest)<0 ){
zBest = argv[i]; zBest = argv[i];
} }
@@ -46,7 +48,9 @@ static void maxFunc(sqlite_func *context, int argc, const char **argv){
if( argc==0 ) return; if( argc==0 ) return;
zBest = argv[0]; zBest = argv[0];
if( zBest==0 ) return;
for(i=1; i<argc; i++){ for(i=1; i<argc; i++){
if( argv[i]==0 ) return;
if( sqliteCompare(argv[i], zBest)>0 ){ if( sqliteCompare(argv[i], zBest)>0 ){
zBest = argv[i]; zBest = argv[i];
} }
@@ -63,15 +67,12 @@ static void lengthFunc(sqlite_func *context, int argc, const char **argv){
assert( argc==1 ); assert( argc==1 );
z = argv[0]; z = argv[0];
if( z==0 ){ if( z==0 ) return;
len = 0;
}else{
#ifdef SQLITE_UTF8 #ifdef SQLITE_UTF8
for(len=0; *z; z++){ if( (0xc0&*z)!=0x80 ) len++; } for(len=0; *z; z++){ if( (0xc0&*z)!=0x80 ) len++; }
#else #else
len = strlen(z); len = strlen(z);
#endif #endif
}
sqlite_set_result_int(context, len); sqlite_set_result_int(context, len);
} }
@@ -82,7 +83,8 @@ static void absFunc(sqlite_func *context, int argc, const char **argv){
const char *z; const char *z;
assert( argc==1 ); assert( argc==1 );
z = argv[0]; z = argv[0];
if( z && z[0]=='-' && isdigit(z[1]) ) z++; if( z==0 ) return;
if( z[0]=='-' && isdigit(z[1]) ) z++;
sqlite_set_result_string(context, z, -1); sqlite_set_result_string(context, z, -1);
} }
@@ -142,10 +144,11 @@ static void roundFunc(sqlite_func *context, int argc, const char **argv){
double r; double r;
char zBuf[100]; char zBuf[100];
assert( argc==1 || argc==2 ); assert( argc==1 || argc==2 );
n = argc==2 && argv[1] ? atoi(argv[1]) : 0; if( argv[0]==0 || (argc==2 && argv[1]==0) ) return;
n = argc==2 ? atoi(argv[1]) : 0;
if( n>30 ) n = 30; if( n>30 ) n = 30;
if( n<0 ) n = 0; if( n<0 ) n = 0;
r = argv[0] ? atof(argv[0]) : 0.0; r = atof(argv[0]);
sprintf(zBuf,"%.*f",n,r); sprintf(zBuf,"%.*f",n,r);
sqlite_set_result_string(context, zBuf, -1); sqlite_set_result_string(context, zBuf, -1);
} }
@@ -215,8 +218,8 @@ static void last_insert_rowid(sqlite_func *context, int arg, const char **argv){
** is implemented as like(A,B). ** is implemented as like(A,B).
*/ */
static void likeFunc(sqlite_func *context, int arg, const char **argv){ static void likeFunc(sqlite_func *context, int arg, const char **argv){
sqlite_set_result_int(context, if( argv[0]==0 || argv[1]==0 ) return;
sqliteLikeCompare(argv[0] ? argv[0] : "",argv[1] ? argv[1] : "")); sqlite_set_result_int(context, sqliteLikeCompare(argv[0], argv[1]));
} }
/* /*
@@ -229,8 +232,19 @@ static void likeFunc(sqlite_func *context, int arg, const char **argv){
** is implemented as glob(A,B). ** is implemented as glob(A,B).
*/ */
static void globFunc(sqlite_func *context, int arg, const char **argv){ static void globFunc(sqlite_func *context, int arg, const char **argv){
sqlite_set_result_int(context, if( argv[0]==0 || argv[1]==0 ) return;
sqliteGlobCompare(argv[0] ? argv[0] : "",argv[1] ? argv[1] : "")); sqlite_set_result_int(context, sqliteGlobCompare(argv[0], argv[1]));
}
/*
** Implementation of the NULLIF(x,y) function. The result is the first
** argument if the arguments are different. The result is NULL if the
** arguments are equal to each other.
*/
static void nullifFunc(sqlite_func *context, int argc, const char **argv){
if( argv[0]!=0 && sqliteCompare(argv[0],argv[1])!=0 ){
sqlite_set_result_string(context, argv[0], -1);
}
} }
/* /*
@@ -334,6 +348,7 @@ static void countFinalize(sqlite_func *context){
*/ */
typedef struct MinMaxCtx MinMaxCtx; typedef struct MinMaxCtx MinMaxCtx;
struct MinMaxCtx { struct MinMaxCtx {
int isNull; /* True if the result should be NULL */
char *z; /* The best so far */ char *z; /* The best so far */
char zBuf[28]; /* Space that can be used for storage */ char zBuf[28]; /* Space that can be used for storage */
}; };
@@ -345,50 +360,52 @@ static void minStep(sqlite_func *context, int argc, const char **argv){
MinMaxCtx *p; MinMaxCtx *p;
p = sqlite_aggregate_context(context, sizeof(*p)); p = sqlite_aggregate_context(context, sizeof(*p));
if( p==0 || argc<1 ) return; if( p==0 || argc<1 ) return;
if( argv[0]==0 || p->isNull ){
p->isNull = 1;
return;
}
if( sqlite_aggregate_count(context)==1 || sqliteCompare(argv[0],p->z)<0 ){ if( sqlite_aggregate_count(context)==1 || sqliteCompare(argv[0],p->z)<0 ){
int len;
if( p->z && p->z!=p->zBuf ){ if( p->z && p->z!=p->zBuf ){
sqliteFree(p->z); sqliteFree(p->z);
} }
if( argv[0] ){ len = strlen(argv[0]);
int len = strlen(argv[0]); if( len < sizeof(p->zBuf) ){
if( len < sizeof(p->zBuf) ){ p->z = p->zBuf;
p->z = p->zBuf;
}else{
p->z = sqliteMalloc( len+1 );
if( p->z==0 ) return;
}
strcpy(p->z, argv[0]);
}else{ }else{
p->z = 0; p->z = sqliteMalloc( len+1 );
if( p->z==0 ) return;
} }
strcpy(p->z, argv[0]);
} }
} }
static void maxStep(sqlite_func *context, int argc, const char **argv){ static void maxStep(sqlite_func *context, int argc, const char **argv){
MinMaxCtx *p; MinMaxCtx *p;
p = sqlite_aggregate_context(context, sizeof(*p)); p = sqlite_aggregate_context(context, sizeof(*p));
if( p==0 || argc<1 ) return; if( p==0 || argc<1 ) return;
if( argv[0]==0 || p->isNull ){
p->isNull = 1;
return;
}
if( sqlite_aggregate_count(context)==1 || sqliteCompare(argv[0],p->z)>0 ){ if( sqlite_aggregate_count(context)==1 || sqliteCompare(argv[0],p->z)>0 ){
int len;
if( p->z && p->z!=p->zBuf ){ if( p->z && p->z!=p->zBuf ){
sqliteFree(p->z); sqliteFree(p->z);
} }
if( argv[0] ){ len = strlen(argv[0]);
int len = strlen(argv[0]); if( len < sizeof(p->zBuf) ){
if( len < sizeof(p->zBuf) ){ p->z = p->zBuf;
p->z = p->zBuf;
}else{
p->z = sqliteMalloc( len+1 );
if( p->z==0 ) return;
}
strcpy(p->z, argv[0]);
}else{ }else{
p->z = 0; p->z = sqliteMalloc( len+1 );
if( p->z==0 ) return;
} }
strcpy(p->z, argv[0]);
} }
} }
static void minMaxFinalize(sqlite_func *context){ static void minMaxFinalize(sqlite_func *context){
MinMaxCtx *p; MinMaxCtx *p;
p = sqlite_aggregate_context(context, sizeof(*p)); p = sqlite_aggregate_context(context, sizeof(*p));
if( p && p->z ){ if( p && p->z && !p->isNull ){
sqlite_set_result_string(context, p->z, strlen(p->z)); sqlite_set_result_string(context, p->z, strlen(p->z));
} }
if( p && p->z && p->z!=p->zBuf ){ if( p && p->z && p->z!=p->zBuf ){
@@ -424,6 +441,7 @@ void sqliteRegisterBuildinFunctions(sqlite *db){
{ "random", -1, randomFunc }, { "random", -1, randomFunc },
{ "like", 2, likeFunc }, { "like", 2, likeFunc },
{ "glob", 2, globFunc }, { "glob", 2, globFunc },
{ "nullif", 2, nullifFunc },
}; };
static struct { static struct {
char *zName; char *zName;

4
src/util.c
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@@ -14,7 +14,7 @@
** This file contains functions for allocating memory, comparing ** This file contains functions for allocating memory, comparing
** strings, and stuff like that. ** strings, and stuff like that.
** **
** $Id: util.c,v 1.43 2002/05/10 13:14:07 drh Exp $ ** $Id: util.c,v 1.44 2002/05/26 21:34:58 drh Exp $
*/ */
#include "sqliteInt.h" #include "sqliteInt.h"
#include <stdarg.h> #include <stdarg.h>
@@ -665,7 +665,7 @@ int sqliteCompare(const char *atext, const char *btext){
int result; int result;
int isNumA, isNumB; int isNumA, isNumB;
if( atext==0 ){ if( atext==0 ){
return -(btext!=0); return -1;
}else if( btext==0 ){ }else if( btext==0 ){
return 1; return 1;
} }