Get locked records info

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4D v20 R7


Get locked records info ( aTable ) -> Function result

Parameter	Type	Description
aTable	Table	Table where you want to get locked records
Function result	Object	Description of locked records (if any)

Description

The Get locked records info command returns an object containing different information about the currently locked record(s) in aTable.

Note: The command works only with 4D and 4D Server. It returns an invalid object when called from 4D Remote. However, it can be called in this context if the "Execute on server" option is activated for the calling method. In this case, the object returned will contain information about the server. When called from a component, it always applies to the host database.

The returned object contains a "records" property which is a collection of objects:

{
    "records": [
        description object,
        (…)
    ]
}

Each "description object" collection element identifies a locked record in the specified table. It contains different properties depending on the origin of the lock (4D process or REST API).

If the record was locked by a 4D process:

Property	Type	Description
contextID	UUID (String)	UUID of the database context responsible for the lock
contextAttributes	Object	Object containing information similar to the LOCKED BY command but applied to the record, the difference being that Get locked records info returns the user name defined in the system and not that of the 4D user, as well as additional information (see below).
recordNumber	Longint	Record number of the locked record

The contextAttributes object is made up of the following properties:

Property	Type	Description
task_id	Number	Process reference number
user_name	String	User name defined by operating system
user4d_alias	String	User alias defined with SET USER ALIAS, otherwise user name in the 4D database directory
user4d_id	Number	4D user number(*)
host_name	String	Name of host machine
task_name	String	Process name
client_version	Number	Version of client application

Only when command is executed on 4D Server and if record locking comes from a remote 4D:
is_remote_context	Boolean	Indicates whether a remote 4D is the origin of the locking (always true since otherwise it is not present)
client_uid	UUID (String)	UUID of 4D remote at the origin of the locking

(*) Only returned in binary databases. You can get the 4D user name from the value of user4d_id by using the following code:

 GET USER LIST($arrNames;$arrIDs)

 $User4DName:=Find in array($arrIDs;user4d_id)

If the record was locked by the $lock REST request (at session level):

Property	Type	Description
host	String	URL with which the entity has been locked, e.g. "127.0.0.1:8044"
IPAddr	String	IP address used in the URL with which the entity has been locked, e.g. "127.0.0.1"
recordNumber	Integer	Record number of the locked record
userAgent	String	User agent of the locker, e.g. "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/94.0.4606.81 Safari/537.36"

Example

You execute the following code:

$vOlocked :=Get locked records info([Table])

If two records were locked in the [Table] table, the following object is returned in $vOlocked:

{
    "records": [
        {
            "contextID": "A9BB84C0E57349E089FA44E04C0F2F25",
            "contextAttributes": {
                "task_id": 8,
                "user_name": "roland",
                "user4d_id": 1,
                "host_name": "iMac de roland",
                "task_name": "P_RandomLock",
                "client_version": -1342106592
            },
            "recordNumber": 1
        },
        {
            "contextID": "8916338D1B8A4D86B857D92F593CCAC3",
            "contextAttributes": {
                "task_id": 9,
                "user_name": "roland",
                "user4d_id": 1,
                "host_name": "iMac de roland",
                "task_name": "P_RandomLock",
                "client_version": -1342106592
            },
            "recordNumber": 2
        }
    ]
}

If the code is executed on a 4D Server and the locking is caused by a remote client machine, the following object is returned in $vOlocked:

{
    "records": [
        {
            "contextID": "B0EC087DC2FA704496C0EA15DC011D1C",
            "contextAttributes": {
                "task_id": 2, 
                "user_name": "achim", 
                "user4d_id": 1,
                "host_name": "achim-pcwin",
                "task_name": "P_RandomLock", 
                "is_remote_context": true,
                "client_uid": "0696E66F6CD731468E6XXX581A87554A",
                "client_version": -268364752
            },
            "recordNumber": 1
        }
    ]
}