Kv_store

Key-value pairs can be permanently stored in the file system. If FEATURE_KV_CACHE is enabled, key-value pairs can be stored in the cache. For details about cache specifications, see . For details about the number of key-value pairs that can be stored in an application, see MAX_KV_SUM.

Since:

1.0

Version:

1.0

Summary

Files

Details

Function Documentation

Description:

Clears all key-value pairs from the cache.

Attention:

This function is available only if is enabled.

Returns:

Returns 0 if the operation is successful; returns -1 otherwise.

UtilsDeleteValue()

Description:

Deletes the value matching a specified key from the file system or cache.

Parameters:

Returns:

Returns 0 if the operation is successful; returns -9 if a parameter is incorrect; returns -1 in other scenarios.

UtilsGetValue()

Description:

Obtains the value matching a specified key from the file system or cache.

Parameters:

Returns:

Returns the length of the value if the operation is successful; returns -9 if a parameter is incorrect; returns -1 in other scenarios; returns 0 if the value is obtained from the cache.

Description:

Adds or updates the value matching a specified key in the file system or cache.

Parameters:

Returns 0 if the operation is successful; returns -9 if a parameter is incorrect; returns -1 in other scenarios.