Answering to my own question. After some lengthy debugging session I
finally figured that
it’s a problem with the ICU library which I build with SQLite for iOS.
The problem was related to ICU’s obscure loading mechanism.
Ben
Am 03.04.14 19:37 schrieb "Stadin, Benjamin" unter
:
>I¹m having problems to return results from a FTS4 table using ICU.
>
>I¹m doing the usual routine to load an ICU collation:
>
>1) Directly after opening the DB:
>
>SELECT icu_load_collation('de_DE', 'LOCALIZED');
>
>2) Creating some table
>
>CREATE VIRTUAL TABLE ¹sometable' USING fts4 (tokenize='icu' 'LOCALIZED',
>status, firstName, lastName)
>
>
>3) Then inserting some Date via prepared statement and binding params
>
>4) List all entries
>
>SELECT * FROM sometable
>
>So far, so good. The collation loads ok, and all entries in the table are
>listed.
>
>5) But when I use a MATCH statement, I just get no results back from the
>table:
>
>SELECT * FROM sometable WHERE sometable MATCH '(lastname:a*) OR
>(firstname:a*)' ORDER BY lastname, firstname COLLATE LOCALIZED
>
>
>
>It is definitely related to the CREATE table with "tokenize='icu'
>LOCALIZEDŒ³. When I create the table without this, I get the expected
>results from the very same query. But I¹m completely stuck here, because I
>just get an empty result set and don¹t see any errors at all.
>
>I should mention that I target iOS and compile in ICU with my build of
>SQLite. There is one place in SQLite which I changed like to enable
>loading an ICU data file on the iPhone like so:
>
>SQLITE_PRIVATE int sqlite3IcuInit(sqlite3 *db){
> struct IcuScalar {
>const char *zName;/* Function name */
>int nArg; /* Number of arguments */
>int enc; /* Optimal text encoding */
>void *pContext; /* sqlite3_user_data()
>context */
>void (*xFunc)(sqlite3_context*,int,sqlite3_value**);
> } scalars[] = {
>{"regexp", 2, SQLITE_ANY, 0, icuRegexpFunc},
>
>{"lower", 1, SQLITE_UTF16,0, icuCaseFunc16},
>{"lower", 2, SQLITE_UTF16,0, icuCaseFunc16},
>{"upper", 1, SQLITE_UTF16, (void*)1, icuCaseFunc16},
>{"upper", 2, SQLITE_UTF16, (void*)1, icuCaseFunc16},
>
>{"lower", 1, SQLITE_UTF8, 0, icuCaseFunc16},
>{"lower", 2, SQLITE_UTF8, 0, icuCaseFunc16},
>{"upper", 1, SQLITE_UTF8, (void*)1, icuCaseFunc16},
>{"upper", 2, SQLITE_UTF8, (void*)1, icuCaseFunc16},
>
>{"like", 2, SQLITE_UTF8, 0, icuLikeFunc},
>{"like", 3, SQLITE_UTF8, 0, icuLikeFunc},
>
>{"icu_load_collation", 2, SQLITE_UTF8, (void*)db, icuLoadCollation},
> };
>
> // begin custom ICU lib stuff
>
> // app dir is specified here because i'll avoid to have any calls to
>system icu data dir,
> // which i think would happen otherwise
>(http://userguide.icu-project.org/icudata)
> const char *icuDatPath = getPathForICU();
> u_setDataDirectory(icuDatPath);
>
> const char *icuBuf = icuData();
> if (icuBuf != NULL) {
> UErrorCode err = U_ZERO_ERROR;
> udata_setAppData_53(getPathForICUCommonDataFile(), &icuBuf, &err);
> }
>
> // end custom ICU stuff
>
>
> int rc = SQLITE_OK;
> int i;
>
> for(i=0; rc==SQLITE_OK && i<(int)(sizeof(scalars)/sizeof(scalars[0]));
>i++){
>struct IcuScalar *p = &scalars[i];
>rc = sqlite3_create_function(
>db, p->zName, p->nArg, p->enc, p->pContext, p->xFunc, 0, 0
>);
> }
>
> return rc;
>}
>
>
>Any pointers greatly appreciated.
>
>Regards
>Ben
>
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