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mdbx: использование MDBX_GET_BOTH для проверки наличия добавляемого значения в таблице.

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Леонид Юрьев (Leonid Yuriev) 2025-01-09 20:40:12 +03:00
parent 84e2c70b98
commit a994a9bbcc
1 changed files with 40 additions and 36 deletions
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76
src/cursor.c
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@ -775,8 +775,9 @@ __hot int cursor_put(MDBX_cursor *mc, const MDBX_val *key, MDBX_val *data, unsig
rc = MDBX_NO_ROOT;
} else if ((flags & MDBX_CURRENT) == 0) {
bool exact = false;
MDBX_val last_key, old_data;
MDBX_val old_data;
if ((flags & MDBX_APPEND) && mc->tree->items > 0) {
MDBX_val last_key;
old_data.iov_base = nullptr;
old_data.iov_len = 0;
rc = (mc->flags & z_inner) ? inner_last(mc, &last_key) : outer_last(mc, &last_key, &old_data);
@ -794,51 +795,53 @@ __hot int cursor_put(MDBX_cursor *mc, const MDBX_val *key, MDBX_val *data, unsig
}
}
} else {
csr_t csr =
/* olddata may not be updated in case DUPFIX-page of dupfix-table */
cursor_seek(mc, (MDBX_val *)key, &old_data, MDBX_SET);
csr_t csr = cursor_seek(mc, (MDBX_val *)key, &old_data, MDBX_SET);
rc = csr.err;
exact = csr.exact;
}
if (likely(rc == MDBX_SUCCESS)) {
if (exact) {
if (unlikely(flags & MDBX_NOOVERWRITE)) {
DEBUG("duplicate key [%s]", DKEY_DEBUG(key));
*data = old_data;
return MDBX_KEYEXIST;
}
if (unlikely(mc->flags & z_inner)) {
/* nested subtree of DUPSORT-database with the same key,
* nothing to update */
eASSERT(env, data->iov_len == 0 && (old_data.iov_len == 0 ||
/* olddata may not be updated in case
DUPFIX-page of dupfix-table */
(mc->tree->flags & MDBX_DUPFIXED)));
return MDBX_SUCCESS;
}
if (unlikely(flags & MDBX_ALLDUPS) && inner_pointed(mc)) {
err = cursor_del(mc, MDBX_ALLDUPS);
if (unlikely(err != MDBX_SUCCESS))
return err;
if (exact) {
cASSERT(mc, rc == MDBX_SUCCESS);
if (unlikely(flags & MDBX_NOOVERWRITE)) {
DEBUG("duplicate key [%s]", DKEY_DEBUG(key));
*data = old_data;
return MDBX_KEYEXIST;
}
if (unlikely(mc->flags & z_inner)) {
/* nested subtree of DUPSORT-database with the same key, nothing to update */
cASSERT(mc, !"Should not happen since");
return (flags & MDBX_NODUPDATA) ? MDBX_KEYEXIST : MDBX_SUCCESS;
}
if (inner_pointed(mc)) {
if (unlikely(flags & MDBX_ALLDUPS)) {
rc = cursor_del(mc, MDBX_ALLDUPS);
if (unlikely(rc != MDBX_SUCCESS))
return rc;
flags -= MDBX_ALLDUPS;
cASSERT(mc, mc->top + 1 == mc->tree->height);
rc = (mc->top >= 0) ? MDBX_NOTFOUND : MDBX_NO_ROOT;
exact = false;
} else if (!(flags & (MDBX_RESERVE | MDBX_MULTIPLE))) {
/* checking for early exit without dirtying pages */
if (unlikely(eq_fast(data, &old_data))) {
cASSERT(mc, mc->clc->v.cmp(data, &old_data) == 0);
if (mc->subcur) {
if (flags & MDBX_NODUPDATA)
return MDBX_KEYEXIST;
if (flags & MDBX_APPENDDUP)
return MDBX_EKEYMISMATCH;
}
} else if ((flags & (MDBX_RESERVE | MDBX_MULTIPLE)) == 0) {
old_data = *data;
csr_t csr = cursor_seek(&mc->subcur->cursor, &old_data, nullptr, MDBX_SET_RANGE);
if (unlikely(csr.exact)) {
cASSERT(mc, csr.err == MDBX_SUCCESS);
if (flags & MDBX_NODUPDATA)
return MDBX_KEYEXIST;
if (flags & MDBX_APPENDDUP)
return MDBX_EKEYMISMATCH;
/* the same data, nothing to update */
return MDBX_SUCCESS;
} else if (csr.err != MDBX_SUCCESS && unlikely(csr.err != MDBX_NOTFOUND)) {
be_poor(mc);
return csr.err;
}
cASSERT(mc, mc->clc->v.cmp(data, &old_data) != 0);
}
} else if ((flags & MDBX_RESERVE) == 0) {
if (unlikely(eq_fast(data, &old_data))) {
cASSERT(mc, mc->clc->v.cmp(data, &old_data) == 0);
/* the same data, nothing to update */
return (mc->subcur && (flags & MDBX_NODUPDATA)) ? MDBX_KEYEXIST : MDBX_SUCCESS;
}
cASSERT(mc, mc->clc->v.cmp(data, &old_data) != 0);
}
} else if (unlikely(rc != MDBX_NOTFOUND))
return rc;
@ -1042,6 +1045,7 @@ __hot int cursor_put(MDBX_cursor *mc, const MDBX_val *key, MDBX_val *data, unsig
return MDBX_EKEYMISMATCH;
} else if (eq_fast(data, &old_data)) {
cASSERT(mc, mc->clc->v.cmp(data, &old_data) == 0);
cASSERT(mc, !"Should not happen since" || batch_dupfix_done);
if (flags & MDBX_NODUPDATA)
return MDBX_KEYEXIST;
/* data is match exactly byte-to-byte, nothing to update */