JSON.STRAPPEND - Amazon ElastiCache for Redis
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JSON.STRAPPEND

Appends a string to the JSON strings at the path.

Syntax

JSON.STRAPPEND <key> [path] <json_string>
  • key (required) – A Redis key of JSON document type.

  • path (optional) – A JSON path. Defaults to the root if not provided.

  • json_string (required) – The JSON representation of a string. Note that a JSON string must be quoted. For example: '"string example"'.

Return

If the path is enhanced syntax:

  • Array of integers that represent the new length of the string at each path.

  • If a value at the path is not a string, its corresponding return value is null.

  • SYNTAXERR error if the input json argument is not a valid JSON string.

  • NONEXISTENT error if the path does not exist.

If the path is restricted syntax:

  • Integer, the string's new length.

  • If multiple string values are selected, the command returns the new length of the last updated string.

  • WRONGTYPE error if the value at the path is not a string.

  • WRONGTYPE error if the input json argument is not a valid JSON string.

  • NONEXISTENT error if the path does not exist.

Examples

Enhanced path syntax:

127.0.0.1:6379> JSON.SET k1 $ '{"a":{"a":"a"}, "b":{"a":"a", "b":1}, "c":{"a":"a", "b":"bb"}, "d":{"a":1, "b":"b", "c":3}}' OK 127.0.0.1:6379> JSON.STRAPPEND k1 $.a.a '"a"' 1) (integer) 2 127.0.0.1:6379> JSON.STRAPPEND k1 $.a.* '"a"' 1) (integer) 3 127.0.0.1:6379> JSON.STRAPPEND k1 $.b.* '"a"' 1) (integer) 2 2) (nil) 127.0.0.1:6379> JSON.STRAPPEND k1 $.c.* '"a"' 1) (integer) 2 2) (integer) 3 127.0.0.1:6379> JSON.STRAPPEND k1 $.c.b '"a"' 1) (integer) 4 127.0.0.1:6379> JSON.STRAPPEND k1 $.d.* '"a"' 1) (nil) 2) (integer) 2 3) (nil)

Restricted path syntax:

127.0.0.1:6379> JSON.SET k1 . '{"a":{"a":"a"}, "b":{"a":"a", "b":1}, "c":{"a":"a", "b":"bb"}, "d":{"a":1, "b":"b", "c":3}}' OK 127.0.0.1:6379> JSON.STRAPPEND k1 .a.a '"a"' (integer) 2 127.0.0.1:6379> JSON.STRAPPEND k1 .a.* '"a"' (integer) 3 127.0.0.1:6379> JSON.STRAPPEND k1 .b.* '"a"' (integer) 2 127.0.0.1:6379> JSON.STRAPPEND k1 .c.* '"a"' (integer) 3 127.0.0.1:6379> JSON.STRAPPEND k1 .c.b '"a"' (integer) 4 127.0.0.1:6379> JSON.STRAPPEND k1 .d.* '"a"' (integer) 2