Grammar and complexity：
EXHSET [EX time] [EXAT time] [PX time] [PXAT time] [NX/XX] [VER/ABS version] time complexity：O(1)
Command Description：
Insert a field into the TairHash specified by the key. If TairHash does not exist, it will automatically create one, and if the field already exists, its value will be overwritten. When inserting, you can use EX/EXAT/PX/PXAT to set the expiration time for the field. When the field expires, it will be deleted actively (active expire) or passive (passivity expire). If the NX option is specified, the insertion will be successful only when the field does not exist. Similarly, if the XX option is specified, the insertion will be successful only when the field exists. If the VER parameter is specified, the version number carried by the VER must be consistent with the current version number of the field before it can be inserted successfully. If the field does not exist or the current version of the field is 0, no check is performed, and the insertion can always be successful. The ABS parameter is used to forcibly set the version number for the field, regardless of the current version number of the field, it can always be inserted successfully, and the version number specified by ABS cannot be 0. This command will trigger the passive elimination check of the field
parameter：
key: The key used to find the TairHash field: An element in TairHash value: The value corresponding to an element in TairHash EX: The relative expiration time of the specified field, in seconds, 0 means no expiration EXAT: Specify the absolute expiration time of the field, in seconds, 0 means no expiration PX: The relative expiration time of the specified field, in milliseconds, 0 means no expiration PXAT: Specify the absolute expiration time of the field, in milliseconds, 0 means no expiration NX/XX: NX means inserting is allowed only when the field to be inserted does not exist, XX means inserting is allowed only when the field exists VER/ABS: VER means that the setting is allowed only when the specified version is consistent with the current version of the field. If the version specified by VER is 0, it means that no version check will be performed. ABS means that the version number is forced to be set and modified regardless of the current version of the field.
Return：
When a new field is created and the value is successfully set for it, the command returns 1, if the field already exists and successfully overwrites the old value, the command returns 0; if XX is specified and the field does not exist, it returns -1, if NX is specified and the field is already If exists, return -1; if VER is specified and the version does not match the current version, the exception message "ERR update version is stale" is returned
Grammar and complexity：
EXHGET time complexity：O(1)
Command Description：
Get the value of a field in TairHash specified by key, if TairHash does not exist or the field does not exist, return nil
parameter：
key: The key used to find the TairHash field: An element in TairHash
Return：
When the field exists, return its corresponding value, when TairHash does not exist or the field does not exist, return nil
Grammar and complexity：
EXHMSET [field value...]
time complexity：O(1)
Command Description：
At the same time, insert multiple fields into TairHash specified by key. If TairHash does not exist, one will be created automatically, and if the field already exists, its value will be overwritten
parameter：
key: The key used to find the TairHash field: An element in TairHash
value: The value corresponding to an element in TairHash
Return：
Return OK
Grammar and complexity：
EXHPEXPIREAT [VER/ABS version] time complexity: (1)
Command Description：
Set the absolute expiration time for a field in the TaiHash specified by the key, in milliseconds. When the expiration time is up, the field will be deleted actively. If the field does not exist, return 0 directly. If VERParameter is specified, the version number carried by VER must be consistent with the current version number of the field before it can be set successfully, or if the version number carried by VERParameter is 0, no version verification is performed. ABSParameter is used to force the field to set the version number, regardless of the current version number of the field, it can always be inserted successfully. At the same time, the current version number of the field is set to the version number specified by ABS. Note that the version number cannot be 0. This command will trigger the passive elimination check of the field
Parameter：
key: The key used to find the TairHash field: An element in TairHash milliseconds-timestamp: Timestamp in milliseconds VER/ABS: VER means that the setting is allowed only when the specified version is consistent with the current version of the field. If the version specified by VER is 0, it means that no version check will be performed. ABS means that the version number is forced to be set and modified regardless of the current version of the field.
Return：
Success: return 1 when the field exists, and return 0 when the field does not exist When the version verification fails, the update version is stale error is returned
Grammar and complexity：
EXHPEXPIRE [VER/ABS version] time complexity：O(1)
Command Description：
Set the relative expiration time for a field in the TairHash specified by the key, in milliseconds. When the expiration time is up, the field will be deleted actively. If the field does not exist, return 0 directly. If VERParameter is specified, the version number carried by VER must be consistent with the current version number of the field before it can be set successfully, or if the version number carried by VERParameter is 0, no version verification is performed. ABSParameter is used to force the field to set the version number, regardless of the current version number of the field, it can always be inserted successfully. At the same time, the current version number of the field is set to the version number specified by ABS. Note that the version number cannot be 0. This command will trigger the passive elimination of the field
Parameter：
key: The key used to find the TairHash field: An element in TairHash
milliseconds: Expiration time in milliseconds VER/ABS: VER means that the setting is allowed only when the specified version is consistent with the current version of the field. If the version specified by VER is 0, it means that no version check will be performed. ABS means that the version number is forced to be set and modified regardless of the current version of the field.
Return：
Return 1 when the field exists, and 0 when the field does not exist When the version verification fails, the update version is stale error will be returned
Grammar and complexity：
EXHEXPIREAT [VER/ABS version] time complexity：O(1)
Command Description：
Set the absolute expiration time for a field in the TairHash specified by the key, in seconds. When the expiration time expires, the field will be actively deleted. If the field does not exist, return 0 directly. If VERParameter is specified, the version number carried by VER must be consistent with the current version number of the field before it can be set successfully, or if the version number carried by VERParameter is 0, no version verification is performed. ABSParameter is used to force the field to set the version number, regardless of the current version number of the field, it can always be inserted successfully. At the same time, the current version number of the field is set to the version number specified by ABS. Note that the version number cannot be 0. This command will trigger the passive elimination of the field
Parameter：
key: The key used to find the TairHash field: An element in TairHash timestamp: Timestamp in seconds VER/ABS: VER means that the setting is allowed only when the specified version is consistent with the current version of the field. If the version specified by VER is 0, it means that no version check will be performed. ABS means that the version number is forced to be set and modified regardless of the current version of the field.
Return：
Return 1 when the field exists, and 0 when the field does not exist When the version verification fails, the update version is stale error will be returned, and the corresponding exception information will be returned for other errors.
Grammar and complexity：
EXHEXPIRE [VER/ABS version] time complexity：O(1)
Command Description：
Set the relative expiration time for a field in the TairHash specified by the key, in seconds. When the expiration time expires, the field will be actively deleted. If the field does not exist, return 0 directly. If VERParameter is specified, the version number carried by VER must be consistent with the current version number of the field before it can be set successfully, or if the version number carried by VERParameter is 0, no version verification is performed. ABSParameter is used to force the field to set the version number, regardless of the current version number of the field, it can always be inserted successfully. At the same time, the current version number of the field is set to the version number specified by ABS. Note that the version number cannot be 0. This command will trigger the passive elimination of the field
Parameter：
key: The key used to find the TairHash field: An element in TairHash timestamp: Timestamp in seconds VER/ABS: VER means that the setting is allowed only when the specified version is consistent with the current version of the field. If the version specified by VER is 0, it means that no version check will be performed. ABS means that the version number is forced to be set and modified regardless of the current version of the field.
Return：
Return 1 when the field exists, and 0 when the field does not exist When the version verification fails, the update version is stale error will be returned, and the corresponding exception information will be returned for other errors.
Grammar and complexity：
EXHPTTL
time complexity：O(1)
Command Description：
View the remaining expiration time of a field in TaiHash specified by key, in milliseconds
Parameter：
key: The key used to find the TairHash field: An element in TairHash
Return：
When TairHash or the field does not exist, it returns -2, when the field exists but no expiration time is set, it returns -1. When the field exists and the expiration time is set, it returns the corresponding expiration time, in milliseconds.
Grammar and complexity：
EXHTTL
time complexity：O(1)
Command Description：
View the remaining expiration time of a field in TaiHash specified by key, in seconds
Parameter：
key: The key used to find the TairHash field: An element in TairHash
Return：
When TairHash or the field does not exist, it returns -2. When the field exists but no expiration time is set, it returns -1. When the field exists and the expiration time is set, it returns the corresponding expiration time, in seconds.
Grammar and complexity：
EXHVER
time complexity：O(1)
Command Description：
View the current version number of a field in TairHash specified by key
Parameter：
key: The key used to find the TairHash field: An element in TairHash
Return：
成功：Returns -1 when TairHash does not exist, returns -2 when the field does not exist, otherwise returns the field version number
Grammar and complexity：
EXHSETVER
time complexity：O(1)
Command Description：
Set the version number of a field in TairHash specified by key
Parameter：
key: The key used to find the TairHash field: An element in TairHash version: version number
Return：
When TairHash or field does not exist, return 0, otherwise return 1
Grammar and complexity：
EXHINCRBY [EX time] [EXAT time] [PX time] [PXAT time] [VER/ABS version]
[MIN minval] [MAX maxval]
time complexity：O(1)
Command Description：
Add the integer value to the value of a field in TairHash specified by key. If TairHash does not exist, it will automatically create a new one. If the specified field does not exist, initialize the value of the field to 0 before adding it. At the same time, you can also use EX/EXAT/PX/PXAT to set the expiration time for the field. If VER is specified, the version number carried by VER must be consistent with the current version number of the field before it can be set successfully, or if the version number carried by VERParameter is 0, no version verification is performed. ABSParameter is used to forcibly set the version number for the field, regardless of the current version number of the field, it can always be set successfully. At the same time, the current version number of the field is set to the version number specified by ABS. Note that the version number specified by ABS cannot be 0. MIN/MAX users provide a boundary for the field. Incr will be executed only when the value of the field is still on this boundary after this incr operation, otherwise an overflow error will be returned. This command will trigger the passive elimination check of the field
Parameter：
key: The key used to find the TairHash field: An element in TairHash value: The value to be increased EX: The relative expiration time of the specified field, in seconds, 0 means no expiration EXAT: Specify the absolute expiration time of the field, in seconds, 0 means no expiration PX: The relative expiration time of the specified field, in milliseconds, 0 means no expiration PXAT: Specify the absolute expiration time of the field, in milliseconds, 0 means no expiration VER/ABS: VER means that the setting is allowed only when the specified version is consistent with the current version of the field. If the version specified by VER is 0, it means that no version check will be performed. ABS means that the version number is forced to be set and modified regardless of the current version of the field.
Return：
Return the added value When the version verification fails, an update version is stale error is returned
Grammar and complexity：
EXHINCRBYFLOAT [EX time] [EXAT time] [PX time] [PXAT time] [VER/ABS version] [MIN minval] [MAX maxval]
time complexity：O(1)
Command Description：
Add the floating-point value to the value of a field in TairHash specified by key. If TairHash does not exist, it will automatically create a new one. If the specified field does not exist, initialize the value of the field to 0 before adding it. At the same time, you can also use EX/EXAT/PX/PXAT to set the expiration time for the field. If VER is specified, the version number carried by VER must be consistent with the current version number of the field before it can be set successfully, or if the version number carried by VERParameter is 0, no version verification is performed. ABSParameter is used to forcibly set the version number for the field, regardless of the current version number of the field, it can always be set successfully. At the same time, the current version number of the field is set to the version number specified by ABS. Note that the version number specified by ABS cannot be 0. MIN/MAX users provide a boundary for the field. Incr will be executed only when the value of the field is still on this boundary after this incr operation, otherwise an overflow error will be returned. This command will trigger the passive elimination check of the field
Parameter：
key: The key used to find the TairHash field: An element in TairHash value: The value to be increased EX: The relative expiration time of the specified field, in seconds, 0 means no expiration EXAT: Specify the absolute expiration time of the field, in seconds, 0 means no expiration PX: The relative expiration time of the specified field, in milliseconds, 0 means no expiration PXAT: Specify the absolute expiration time of the field, in milliseconds, 0 means no expiration VER/ABS: VER means that the setting is allowed only when the specified version is consistent with the current version of the field. If the version specified by VER is 0, it means that no version check will be performed. ABS means that the version number is forced to be set and modified regardless of the current version of the field.
Return：
Return the added value When the version verification fails, the update version is stale error is returned, and the corresponding exception information is returned for other errors (for example, the original field value is not a floating point)
Grammar and complexity：
EXHGETWITHVER
time complexity：O(1)
Command Description：
At the same time, get the value and version of a field of TairHash specified by key. If TairHash does not exist or the field does not exist, return nil
Parameter：
key: The key used to find the TairHash field: An element in TairHash
Return：
If TairHash does not exist or the field does not exist, return nil, otherwise return the value and version corresponding to the field
Grammar and complexity：
EXHMGET [field ...]
time complexity：O(n)
Command Description：
At the same time get the value of multiple fields of TairHash specified by key, if TairHash does not exist or the field does not exist, return nil
Parameter：
key: The key used to find the TairHash field: An element in TairHash
Return：
Returns an array, each element of the array corresponds to a field, if TairHash does not exist or the field does not exist, it is nil, otherwise it is the value corresponding to the field
Grammar and complexity：
EXHMGETWITHVER [field ...]
time complexity：O(n)
Command Description：
Get the value and version of multiple fields of TairHash specified by key at the same time. If TairHash does not exist or the field does not exist, return nil
Parameter：
key: The key used to find the TairHash field: An element in TairHash
Return：
Returns an array, each element of the array corresponds to a field, if TairHash does not exist or the field does not exist, it is nil, otherwise, the value and version corresponding to the field
Grammar and complexity：
EXHDEL ...
time complexity：O(1)
Command Description：
Delete a field of TairHash specified by key, if TairHash does not exist or the field does not exist, return 0, and return 1 if successfully deleted
Parameter：
key: The key used to find the TairHash field: An element in TairHash
Return：
If TairHash does not exist, return 0. How to return the number of files deleted successfully?
Grammar and complexity：
EXHLEN [noexp]
time complexity：It is O(1) if it is not a noexp option, and O(N) if it is a noexp option
Command Description：
Get the number of fields in TairHash specified by key. By default, this command will not trigger the passive elimination of expired fields, nor will it filter them out, so the result may include fields that have expired but have not been deleted. If you only want to return the number of fields that have not expired, you can bring a noexpParameter at the end. Note that with this parameter, the RT of exhlen will be affected by the size of exhash (because it needs to be traversed), and exhlen will not trigger the field Is eliminated, it just filters out the expired fields
Parameter：
key: The key used to find the TairHash
Return：
If TairHash does not exist or the field does not exist, return 0, if successful deletion returns the number of fields in TairHash
Grammar and complexity：
EXHEXISTS
time complexity：O(1)
Command Description：
Query whether there is a corresponding field in TairHash specified by key
Parameter：
key: The key used to find the TairHash field: An element in TairHash
Return：
If TairHash does not exist or the field does not exist, return 0, if the field exists, return 1
Grammar and complexity：
EXHSTRLEN
time complexity：O(1)
Command Description：
Get the length of the value of a field in TaiHash specified by key
Parameter：
key: The key used to find the TairHash field: An element in TairHash
Return：
If TairHash does not exist or the field does not exist, return 0, otherwise return the length of the corresponding value of the field
Grammar and complexity：
EXHKEYS
time complexity：O(1)
Command Description：
Get the keys of all fields in TairHash specified by key
Parameter：
key: The key used to find the TairHash
Return：
Return an array, each bit of the array corresponds to each field in TairHash, if TairHash does not exist, return an empty array
Grammar and complexity：
EXHVALS
time complexity：O(1)
Command Description：
Get the value of all fields in TairHash specified by key
Parameter：
key: The key used to find the TairHash
Return：
Returns an array, each bit of the array corresponds to the value of each field in TairHash, if TairHash does not exist, it returns an empty array
Grammar and complexity：
EXHGETALL
time complexity：O(1)
Command Description：
Get the key-value pairs of all fields in TairHash specified by key
Parameter：
key: The key used to find the TairHash
Return：
Returns an array, each bit of the array corresponds to the key-value pair of each field in TairHash, if TairHash does not exist, it returns an empty array
Grammar and complexity：
EXHSCAN [MATCH pattern] [COUNT count]
time complexity：O(1)、O(N)
Command Description：
Scan the TairHash specified by the key, the scanning mode op can be >, >=, <, <=, ==, ^, $, and the result set can be filtered according to the pattern specified by MATCH while scanning, and the COUNT pair list can also be used The number of scans is limited. If not specified, the default value is 10. The SCAN/HSCAN of TairHash and Redis Yunsheng Hash are not the same. It does not have the concept of cursor. On the contrary, users can use subkey to directly locate the starting position of the scan. Compared with the cursor which is meaningless to business, subkey is more business-friendly . At the same time, the native Redis Hash scanning algorithm may return a large number of scanned fields when rehashing, but TaiHash does not have this problem. During the asymptotic scanning process, regardless of whether the field in TaiHash increases or decreases, the scanned fields are already scanned. The field will never be scanned and returned again.
Parameter：
key: The key used to find the TairHash op: Used to locate the starting point of the scan, which can be:> (start from the first field greater than subkey), >= (start from the first field position greater than or equal to subkey), <(start from the first field less than subkey ), <= (start from the first field less than or equal to subkey), == (start from the first field equal to subkey), ^ (start from the first field), $ (start from the last field)
subkey: The key used to search for the starting position of the scan. When op is ^ or $, the value will be ignored MATCH: Rules for filtering scan results COUNT: It is used to specify the number of fields in a single scan. Note that COUNT only represents the number of feilds of TairHash scanned each time. It does not mean that COUNT field result sets will be returned in the end. The size of the result set depends on the current fields in TaiHash. The number and whether to specify MATCH for filtering depends. The default value of COUNT is 10
Return：
Returns an array with two elements. The first element of the array is a string, which represents the next field to be scanned after the end of this scan. If there is no field to scan after the end of this scan, then the element is empty String. The second array element is still an array, and the array contains all the field/values that are iterated this time. If an empty TairHash is found or TairHash does not exist, then both array elements are empty.
example： 1、How to progressively scan the entire TaiHash:
127.0.0.1:6379> exhmset exhashkey field1 val1 field2 val2 field3 val3 field4 val4 field5 val5 field6 val6 field7 val7 field8 val8 field9 val9
OK
127.0.0.1:6379> exhscan exhashkey ^ xxx COUNT 3
1) "field4"
2) 1) "field1"
2) "val1"
3) "field2"
4) "val2"
5) "field3"
6) "val3"
127.0.0.1:6379> exhscan exhashkey >= field4 COUNT 3
1) "field7"
2) 1) "field4"
2) "val4"
3) "field5"
4) "val5"
5) "field6"
6) "val6"
127.0.0.1:6379> exhscan exhashkey >= field7 COUNT 3
1)
2) 1) "field7"
2) "val7"
3) "field8"
4) "val8"
5) "field9"
6) "val9"
127.0.0.1:6379>
2、How to use MATCH to filter the result set Exact match：
127.0.0.1:6379> exhmset exhashkey field1_1 val1_1 field1_2 val1_2 field1_3 val1_3 field1_4 val1_4 field1_5 val1_5 field2_1 val2_1 field2_2 val2_2 field2_3 val2_3 field6_1 val6_1 field6_2 val6_2 field6_3 val6_3 field6_4 val6_4 field8_1 val8_1 field8_2 val8_4
OK
127.0.0.1:6379> exhscan exhashkey ^ xxx COUNT 3 MATCH field1_1
1) "field1_4"
2) 1) "field1_1"
2) "val1_1"
127.0.0.1:6379> exhscan exhashkey >= field1_4 COUNT 3 MATCH field1_1
1) "field2_2"
2) (empty list or set)
127.0.0.1:6379> exhscan exhashkey >= field2_2 COUNT 3 MATCH field1_1
1) "field6_2"
2) (empty list or set)
127.0.0.1:6379> exhscan exhashkey >= field6_2 COUNT 3 MATCH field1_1
1) "field8_1"
2) (empty list or set)
127.0.0.1:6379> exhscan exhashkey >= field8_1 COUNT 3 MATCH field1_1
1)
2) (empty list or set)
Fuzzy matching：
127.0.0.1:6379> exhmset exhashkey field1_1 val1_1 field1_2 val1_2 field1_3 val1_3 field1_4 val1_4 field1_5 val1_5 field2_1 val2_1 field2_2 val2_2 field2_3 val2_3 field6_1 val6_1 field6_2 val6_2 field6_3 val6_3 field6_4 val6_4 field8_1 val8_1 field8_2 val8_4
OK
127.0.0.1:6379> exhscan exhashkey ^ xxx COUNT 3 MATCH field6_*
1) "field1_4"
2) (empty list or set)
127.0.0.1:6379> exhscan exhashkey >= field1_4 COUNT 3 MATCH field6_*
1) "field2_2"
2) (empty list or set)
127.0.0.1:6379> exhscan exhashkey >= field2_2 COUNT 3 MATCH field6_*
1) "field6_2"
2) 1) "field6_1"
2) "val6_1"
127.0.0.1:6379> exhscan exhashkey >= field6_2 COUNT 3 MATCH field6_*
1) "field8_1"
2) 1) "field6_2"
2) "val6_2"
3) "field6_3"
4) "val6_3"
5) "field6_4"
6) "val6_4"
127.0.0.1:6379> exhscan exhashkey >= field8_1 COUNT 3 MATCH field6_*
1)
2) (empty list or set)