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Provides functions for obtaining, setting, and deleting a key-value pair.
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 MAX_CACHE_SIZE. 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
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Provides functions for obtaining, setting, and deleting a key-value pair. |
|
UtilsGetValue (const char *key, char *value, unsigned int len) |
Obtains the value matching a specified key from the file system or cache. |
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UtilsSetValue (const char *key, const char *value) |
Adds or updates the value matching a specified key in the file system or cache. |
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UtilsDeleteValue (const char *key) |
Deletes the value matching a specified key from the file system or cache. |
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ClearKVCache (void) |
int ClearKVCache (void )
Description:
Clears all key-value pairs from the cache.
Attention:
This function is available only if FEATURE_KV_CACHE is enabled.
Returns:
Returns 0 if the operation is successful; returns -1 otherwise.
int UtilsDeleteValue (const char * key)
Description:
Deletes the value matching a specified key from the file system or cache.
Parameters:
| key | Indicates the key whose value is to be deleted. It allows only lowercase letters, digits, underscores (_), and dots (.). Its length cannot exceed 32 bytes (including the end-of-text character in the string). |
Returns:
Returns 0 if the operation is successful; returns -9 if a parameter is incorrect; returns -1 in other scenarios.
int UtilsGetValue (const char * key, char * value, unsigned int len )
Description:
Obtains the value matching a specified key from the file system or cache.
Parameters:
| key | Indicates the key to be indexed. It allows only lowercase letters, digits, underscores (_), and dots (.). Its length cannot exceed 32 bytes (including the end-of-text character in the string). |
| value | Indicates the buffer for storing the value that matches the key. This is an output parameter. |
| len | Indicates the size of the value space in the buffer. |
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.
int UtilsSetValue (const char * key, const char * value )
Description:
Adds or updates the value matching a specified key in the file system or cache.
Parameters:
| key | Indicates the key whose value is to be added or updated. It allows only lowercase letters, digits, underscores (_), and dots (.). Its length cannot exceed 32 bytes (including the end-of-text character in the string). |
| value | Indicates the value to be added or updated. Its length cannot exceed 128 bytes (including the end-of-text character in the string). |
Returns:
Returns 0 if the operation is successful; returns -9 if a parameter is incorrect; returns -1 in other scenarios.
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