Comments (11)
是有计划公开 KV 迭代器的 API ,或者你来实现一下?完事直接 PR 上来
from flashdb.
好滴,我先做一版提个PR
from flashdb.
fixed in #12
from flashdb.
请检查源程序..\FlashDB-master\src\fdb_kvdb.c中第1673行:kv->addr.start == 0;
该语句是否写错了?应该为:
kv->addr.start = 0;
from flashdb.
请检查源程序..\FlashDB-master\src\fdb_kvdb.c中第1673行:kv->addr.start == 0;
该语句是否写错了?应该为:
kv->addr.start = 0;
已修复。晚些时候合并一个PR过来
from flashdb.
还有,你修改后的,能否整理出一份完整的使用例程,说明如何使用,可以吗?现在有点不太明白你的用意。
from flashdb.
还有,你修改后的,能否整理出一份完整的使用例程,说明如何使用,可以吗?现在有点不太明白你的用意。
要遍历kvdb,首先定义一个迭代器对象,然后调用初始化函数对迭代器对象进行初始化:
struct fdb_kv_iterator iterator;
fdb_kv_iterator_init(&iterator);
然后,用一个while循环来调用fdb_kv_iterate()函数来执行遍历:
fdb_kv_t itr_kv;
while (fdb_kv_iterate(env_db, &iterator)) {
itr_kv = &(iterator.curr_kv);
data_size = (size_t)itr_kv->value_len;
data_buf = sh_malloc(data_size);
if (data_buf == NULL) {
sh_printf(ofd, "Malloc failed.\r\n");
return -ENOMEM;
}
fdb_blob_read(&(env_db->parent), fdb_kv_to_blob(itr_kv, fdb_blob_make(&blob, data_buf, data_size)));
/* blahblahblah do what ever you like with blob... */
sh_free(data_buf);
}
迭代未结束,函数返回true,while一直循环,直到遍历结束,函数返回false,退出循环
迭代器对象里有三个统计值,统计当前迭代得到有效的键值对个数、有效的value占用空间、有效的kv对象占用空间。
注意,每次遍历之前必须对迭代器对象执行初始化。不要在你的应用代码里手动修改迭代器对象的内容,尤其是sector_addr成员。
from flashdb.
谢谢!
from flashdb.
还有,你修改后的,能否整理出一份完整的使用例程,说明如何使用,可以吗?现在有点不太明白你的用意。
要遍历kvdb,首先定义一个迭代器对象,然后调用初始化函数对迭代器对象进行初始化:
struct fdb_kv_iterator iterator; fdb_kv_iterator_init(&iterator);
然后,用一个while循环来调用fdb_kv_iterate()函数来执行遍历:
fdb_kv_t itr_kv; while (fdb_kv_iterate(env_db, &iterator)) { itr_kv = &(iterator.curr_kv); data_size = (size_t)itr_kv->value_len; data_buf = sh_malloc(data_size); if (data_buf == NULL) { sh_printf(ofd, "Malloc failed.\r\n"); return -ENOMEM; } fdb_blob_read(&(env_db->parent), fdb_kv_to_blob(itr_kv, fdb_blob_make(&blob, data_buf, data_size))); /* blahblahblah do what ever you like with blob... */ sh_free(data_buf); }
请问下遍历后itr_kv->name 打印一直是空的 没有什么内容是什么原因?
from flashdb.
@lilealyh 请问是使用的仓库最新的代码吗?itr_kv->name_len是否为0呢?
也看下iterator.iterated_cnt,这个代表当前遍历到的有效的k-v对的数量,如果一直是0,是不是kvdb本身是空的?
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