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Hash: API to get value string len by field name.

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This commit is contained in:
antirez 2015-02-27 15:22:49 +01:00
parent c95507881a
commit d8f8b0575f
1 changed files with 23 additions and 1 deletions
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24
src/t_hash.c
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@ -130,7 +130,6 @@ robj *hashTypeGetObject(robj *o, robj *field) {
value = createStringObjectFromLongLong(vll); value = createStringObjectFromLongLong(vll);
} }
} }
} else if (o->encoding == REDIS_ENCODING_HT) { } else if (o->encoding == REDIS_ENCODING_HT) {
robj *aux; robj *aux;
@ -144,6 +143,29 @@ robj *hashTypeGetObject(robj *o, robj *field) {
return value; return value;
} }
/* Higher level function using hashTypeGet*() to return the length of the
* object associated with the requested field, or 0 if the field does not
* exist. */
size_t hashTypeGetValueLength(robj *o, robj *field) {
size_t len = 0;
if (o->encoding == REDIS_ENCODING_ZIPLIST) {
unsigned char *vstr = NULL;
unsigned int vlen = UINT_MAX;
long long vll = LLONG_MAX;
if (hashTypeGetFromZiplist(o, field, &vstr, &vlen, &vll) == 0)
len = vstr ? vlen : sdigits10(vll);
} else if (o->encoding == REDIS_ENCODING_HT) {
robj *aux;
if (hashTypeGetFromHashTable(o, field, &aux) == 0)
len = sdslen(aux->ptr);
} else {
redisPanic("Unknown hash encoding");
}
return len;
}
/* Test if the specified field exists in the given hash. Returns 1 if the field /* Test if the specified field exists in the given hash. Returns 1 if the field
* exists, and 0 when it doesn't. */ * exists, and 0 when it doesn't. */
int hashTypeExists(robj *o, robj *field) { int hashTypeExists(robj *o, robj *field) {