HMGet gets the string value of multiple hash fields. It takes a string key 'k' and a variadic number of fields 'f'. It returns an array of interface{} containing the values corresponding to the provided fields and any possible error. Parameters: k: The key of the hash table. f: Variable number o
(key string, field ...interface{})
| 229 | // []interface{}: An array of interface{} containing values corresponding to the fields. |
| 230 | // error: An error if occurred during the operation, or nil on success. |
| 231 | func (hs *HashStructure) HMGet(key string, field ...interface{}) ([]interface{}, error) { |
| 232 | // check the key ttl |
| 233 | ttl, _ := hs.TTL(key) |
| 234 | if ttl == -1 { |
| 235 | return nil, _const.ErrKeyIsExpired |
| 236 | } |
| 237 | |
| 238 | // Convert the parameters to bytes |
| 239 | k := stringToBytesWithKey(key) |
| 240 | var interfaces []interface{} |
| 241 | |
| 242 | for _, fi := range field { |
| 243 | // Convert the parameters to bytes |
| 244 | f, err, _ := interfaceToBytes(fi) |
| 245 | if err != nil { |
| 246 | return nil, err |
| 247 | } |
| 248 | |
| 249 | // Check the parameters |
| 250 | if len(k) == 0 || len(f) == 0 { |
| 251 | return nil, _const.ErrKeyIsEmpty |
| 252 | } |
| 253 | |
| 254 | // Find the hash metadata by the given key |
| 255 | hashMeta, err := hs.findHashMeta(key, Hash) |
| 256 | if err != nil { |
| 257 | return nil, err |
| 258 | } |
| 259 | |
| 260 | // If the counter is 0, return nil |
| 261 | if hashMeta.counter == 0 { |
| 262 | return nil, nil |
| 263 | } |
| 264 | |
| 265 | // Create a new HashField |
| 266 | hf := &HashField{ |
| 267 | field: f, |
| 268 | key: k, |
| 269 | version: hashMeta.version, |
| 270 | } |
| 271 | |
| 272 | // Encode the HashField |
| 273 | hfBuf := hf.encodeHashField() |
| 274 | |
| 275 | // Get the field from the database |
| 276 | value, err := hs.db.Get(hfBuf) |
| 277 | if err != nil { |
| 278 | return nil, err |
| 279 | } |
| 280 | |
| 281 | // Get the value type from the hashValueTypes |
| 282 | valueType := hs.hashValueType |
| 283 | |
| 284 | // Values of different types need to be converted to corresponding types |
| 285 | valueToInterface, err := byteToInterface(value, valueType) |
| 286 | if err != nil { |
| 287 | return nil, err |
| 288 | } |