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Overview
Comment:Add an xMkKey callback to the built-in collation sequence "nocase". Fix a bug in encoding text values with collation sequences into database keys.
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SHA1: 6c9adc9acc1d16456dc53e85296753b44929ae37
User & Date: dan 2012-04-23 14:11:49
Context
2012-04-23
14:26
Remove the VDBE merge sorter. check-in: 1073bb477e user: drh tags: trunk
14:11
Add an xMkKey callback to the built-in collation sequence "nocase". Fix a bug in encoding text values with collation sequences into database keys. check-in: 6c9adc9acc user: dan tags: trunk
12:47
Remove the sqlite4_get_table() API. check-in: ff68adaca1 user: drh tags: trunk
Changes
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Changes to src/main.c. 

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**
** This collating sequence is intended to be used for "case independant
** comparison". SQLite's knowledge of upper and lower case equivalents
** extends only to the 26 characters used in the English language.
**
** At the moment there is only a UTF-8 implementation.
*/
static int nocaseCollatingFunc(
  void *NotUsed,
  int nKey1, const void *pKey1,
  int nKey2, const void *pKey2
){
  int r = sqlite4StrNICmp(
      (const char *)pKey1, (const char *)pKey2, (nKey1<nKey2)?nKey1:nKey2);
  UNUSED_PARAMETER(NotUsed);
  if( 0==r ){
    r = nKey1-nKey2;
  }
  return r;
}

















/*
** Return the ROWID of the most recent insert
*/
sqlite_int64 sqlite4_last_insert_rowid(sqlite4 *db){
  return db->lastRowid;
}
................................................................................
*/
static int createCollation(
  sqlite4* db,
  const char *zName, 
  u8 enc,
  void* pCtx,
  int(*xCompare)(void*,int,const void*,int,const void*),
  int(*xMakeKey)(void*,const void*,int,const void*,int),
  void(*xDel)(void*)
){
  CollSeq *pColl;
  int enc2;
  int nName = sqlite4Strlen30(zName);
  
  assert( sqlite4_mutex_held(db->mutex) );
................................................................................
  if( db->mallocFailed ){
    goto opendb_out;
  }
  db->pDfltColl = sqlite4FindCollSeq(db, SQLITE_UTF8, "BINARY", 0);
  assert( db->pDfltColl!=0 );

  /* Also add a UTF-8 case-insensitive collation sequence. */
  createCollation(db, "NOCASE", SQLITE_UTF8, 0, nocaseCollatingFunc, 0, 0);



  /* Parse the filename/URI argument. */
  db->openFlags = flags;
  rc = sqlite4ParseUri(zVfs, zFilename, &flags, &db->pVfs, &zOpen, &zErrMsg);
  if( rc!=SQLITE_OK ){
    if( rc==SQLITE_NOMEM ) db->mallocFailed = 1;
    sqlite4Error(db, rc, zErrMsg ? "%s" : 0, zErrMsg);
................................................................................
*/
int sqlite4_create_collation(
  sqlite4* db, 
  const char *zName, 
  int enc, 
  void* pCtx,
  int(*xCompare)(void*,int,const void*,int,const void*),
  int(*xMakeKey)(void*,int,const void*,int,const void*),
  void(*xDel)(void*)
){
  int rc;
  sqlite4_mutex_enter(db->mutex);
  assert( !db->mallocFailed );
  rc = createCollation(db, zName, (u8)enc, pCtx, xCompare, xMakeKey, xDel);
  rc = sqlite4ApiExit(db, rc);








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**
** This collating sequence is intended to be used for "case independant
** comparison". SQLite's knowledge of upper and lower case equivalents
** extends only to the 26 characters used in the English language.
**
** At the moment there is only a UTF-8 implementation.
*/
static int collNocaseCmp(
  void *NotUsed,
  int nKey1, const void *pKey1,
  int nKey2, const void *pKey2
){
  int r = sqlite4StrNICmp(
      (const char *)pKey1, (const char *)pKey2, (nKey1<nKey2)?nKey1:nKey2);
  UNUSED_PARAMETER(NotUsed);
  if( 0==r ){
    r = nKey1-nKey2;
  }
  return r;
}

static int collNocaseMkKey(
  void *NotUsed,
  int nIn, const void *pKey1,
  int nOut, void *pKey2
){
  if( nOut<nIn ){
    int i;
    u8 *aIn = (u8 *)pKey1;
    u8 *aOut = (u8 *)pKey2;
    for(i=0; i<nIn; i++){
      aOut[i] = sqlite4UpperToLower[aIn[i]];
    }
  }
  return nIn;
}

/*
** Return the ROWID of the most recent insert
*/
sqlite_int64 sqlite4_last_insert_rowid(sqlite4 *db){
  return db->lastRowid;
}
................................................................................
*/
static int createCollation(
  sqlite4* db,
  const char *zName, 
  u8 enc,
  void* pCtx,
  int(*xCompare)(void*,int,const void*,int,const void*),
  int(*xMakeKey)(void*,int,const void*,int,void*),
  void(*xDel)(void*)
){
  CollSeq *pColl;
  int enc2;
  int nName = sqlite4Strlen30(zName);
  
  assert( sqlite4_mutex_held(db->mutex) );
................................................................................
  if( db->mallocFailed ){
    goto opendb_out;
  }
  db->pDfltColl = sqlite4FindCollSeq(db, SQLITE_UTF8, "BINARY", 0);
  assert( db->pDfltColl!=0 );

  /* Also add a UTF-8 case-insensitive collation sequence. */
  createCollation(db, 
      "NOCASE", SQLITE_UTF8, 0, collNocaseCmp, collNocaseMkKey, 0
  );

  /* Parse the filename/URI argument. */
  db->openFlags = flags;
  rc = sqlite4ParseUri(zVfs, zFilename, &flags, &db->pVfs, &zOpen, &zErrMsg);
  if( rc!=SQLITE_OK ){
    if( rc==SQLITE_NOMEM ) db->mallocFailed = 1;
    sqlite4Error(db, rc, zErrMsg ? "%s" : 0, zErrMsg);
................................................................................
*/
int sqlite4_create_collation(
  sqlite4* db, 
  const char *zName, 
  int enc, 
  void* pCtx,
  int(*xCompare)(void*,int,const void*,int,const void*),
  int(*xMakeKey)(void*,int,const void*,int,void*),
  void(*xDel)(void*)
){
  int rc;
  sqlite4_mutex_enter(db->mutex);
  assert( !db->mallocFailed );
  rc = createCollation(db, zName, (u8)enc, pCtx, xCompare, xMakeKey, xDel);
  rc = sqlite4ApiExit(db, rc);

Changes to src/sqlite.h.in. 

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*/
int sqlite4_create_collation(
  sqlite4*, 
  const char *zName, 
  int eTextRep, 
  void *pArg,
  int(*xCompare)(void*,int,const void*,int,const void*),
  int(*xMakeKey)(void*,int,const void*,int,const void*),
  void(*xDestroy)(void*)
);

/*
** CAPI3REF: Collation Needed Callbacks
**
** ^To avoid having to register all collation sequences before a database








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*/
int sqlite4_create_collation(
  sqlite4*, 
  const char *zName, 
  int eTextRep, 
  void *pArg,
  int(*xCompare)(void*,int,const void*,int,const void*),
  int(*xMakeKey)(void*,int,const void*,int,void*),
  void(*xDestroy)(void*)
);

/*
** CAPI3REF: Collation Needed Callbacks
**
** ^To avoid having to register all collation sequences before a database

Changes to src/sqliteInt.h. 

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** collating sequence may not be read or written.
*/
struct CollSeq {
  char *zName;          /* Name of the collating sequence, UTF-8 encoded */
  u8 enc;               /* Text encoding handled by xCmp() */
  void *pUser;          /* First argument to xCmp() */
  int (*xCmp)(void*,int, const void*, int, const void*);
  int (*xMkKey)(void*,const void*,int,const void*,int);
  void (*xDel)(void*);  /* Destructor for pUser */
};

/*
** A sort order can be either ASC or DESC.
*/
#define SQLITE_SO_ASC       0  /* Sort in ascending order */








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** collating sequence may not be read or written.
*/
struct CollSeq {
  char *zName;          /* Name of the collating sequence, UTF-8 encoded */
  u8 enc;               /* Text encoding handled by xCmp() */
  void *pUser;          /* First argument to xCmp() */
  int (*xCmp)(void*,int, const void*, int, const void*);
  int (*xMkKey)(void*,int, const void*, int, void*);
  void (*xDel)(void*);  /* Destructor for pUser */
};

/*
** A sort order can be either ASC or DESC.
*/
#define SQLITE_SO_ASC       0  /* Sort in ascending order */

Changes to src/vdbecodec.c. 

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  if( flags & MEM_Str ){
    if( enlargeEncoderAllocation(p, pMem->n*4 + 2) ) return SQLITE_NOMEM;
    p->aOut[p->nOut++] = 0x24;   /* Text */
    if( pColl==0 || pColl->xMkKey==0 ){
      memcpy(p->aOut+p->nOut, pMem->z, pMem->n);
      p->nOut += pMem->n;
    }else{
      n = pColl->xMkKey(pColl->pUser, pMem->z, pMem->n, p->aOut+p->nOut,
                        p->nAlloc - p->nOut);
      if( n > p->nAlloc - p->nOut ){
        if( enlargeEncoderAllocation(p, n) ) return SQLITE_NOMEM;
        pColl->xMkKey(pColl->pUser, pMem->z, pMem->n, p->aOut+p->nOut,
                        p->nAlloc - p->nOut);
      }
    }
    p->aOut[p->nOut++] = 0x00;
  }else
  {
    const unsigned char *a;
    unsigned char s, t;
    assert( flags & MEM_Blob );








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  if( flags & MEM_Str ){
    if( enlargeEncoderAllocation(p, pMem->n*4 + 2) ) return SQLITE_NOMEM;
    p->aOut[p->nOut++] = 0x24;   /* Text */
    if( pColl==0 || pColl->xMkKey==0 ){
      memcpy(p->aOut+p->nOut, pMem->z, pMem->n);
      p->nOut += pMem->n;
    }else{
      int nSpc = p->nAlloc-p->nOut;
      n = pColl->xMkKey(pColl->pUser, pMem->n, pMem->z, nSpc, p->aOut+p->nOut);
      if( n>nSpc ){
        if( enlargeEncoderAllocation(p, n) ) return SQLITE_NOMEM;
        pColl->xMkKey(pColl->pUser, pMem->n, pMem->z, n, p->aOut+p->nOut);
      }
      p->nOut += n;
    }
    p->aOut[p->nOut++] = 0x00;
  }else
  {
    const unsigned char *a;
    unsigned char s, t;
    assert( flags & MEM_Blob );

Changes to test/simple.test. 

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do_execsql_test 46.1 {
  CREATE TABLE t1(x);
  CREATE UNIQUE INDEX i1 ON t1(x);
}

do_execsql_test 46.2 { INSERT INTO t1 VALUES(NULL) }
do_execsql_test 46.3 { INSERT INTO t1 VALUES(NULL) }














finish_test









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do_execsql_test 46.1 {
  CREATE TABLE t1(x);
  CREATE UNIQUE INDEX i1 ON t1(x);
}

do_execsql_test 46.2 { INSERT INTO t1 VALUES(NULL) }
do_execsql_test 46.3 { INSERT INTO t1 VALUES(NULL) }

#-------------------------------------------------------------------------
reset_db

do_execsql_test 46.1 {
  CREATE TABLE t1(x, y COLLATE nocase);
  CREATE UNIQUE INDEX i1 ON t1(y);
}

do_catchsql_test 46.2 {
  INSERT INTO t1 VALUES(1, 'ABC');
  INSERT INTO t1 VALUES(2, 'abc');
} {1 {column y is not unique}}

finish_test

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