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v4.2
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v4.2

    Property

    Property is a component of schema that describes the data dimension of entities and relations in the graph. For example, node schema @card (Bank Card) has card number, balance, opening time and other node properties; edge schema @transaction (Transaction) has amount, transfer time and other edge properties.

    Node properties _id, _uuid and edge properties _uuid, _from, _to, _from_uuid, _to_uuid are created automatically along with node schema and edge schema. These system properties are not deletable. Each schema may contain multiple properties.

    Property features:

    • Supported data types of property are: int32, int64, uint32, uint64, float, double, string, text, datetime, timestamp;
    Property Type
    Description
    float 4 bytes with a data precision of 6 significant digits
    double 8 bytes with a data precision of 15 significant digits
    string Maximum of 65,535 bytes
    text No limit on length
    datetime Valid input formats are yyyy-mm-dd hh:mm:ss and yyyy-mm-dd hh:mm:ss.ssssss, the string will be stored as an uint64 that equals the number of milliseconds from 1900-01-01 00:00:00 UTC onwards
    timestamp Valid input formats are yyyy-mm-dd hh:mm:ss, yyyy-mm-dd, yyyymmddhhmmss and yyyymmdd, the string will be stored as an uint32 that equals the number of seconds from 1970-01-01 00:00:00 UTC onwards, the time zone could be set via RequestConfig of the desired SDK
    • Property is usually combined with schema in the form of @<schema>.<property>, interpreted as “the value of property <property> of nodes/edges of schema <schema>"; independent property expression without schema <property> indicates the value of property <property> for nodes or edges of any schema, or empty value if the property does not exist.

    Naming Conventions

    Properties are named by developers. A same name can be shared between two properties of different schemas, but not between properties of a same schema.

    • 2 ~ 64 characters
    • Not allow to start with wave line '~'
    • Not allow to contain back quote '`'
    • Not allow to use Reserved Words listed in Basic Concepts

    Show Property

    Returned table name: _nodeProperty and/or _edgeProperty
    Returned table header: name | type | lte | schema | description (the name, data type, whether LTEed, schema and description of the property)

    Syntax:

    // To show properties of all schemas in the current graphset (node properties and edges properties in separated tables)
    show().property()
    
    // To show properties of all node schemas in the current graphset
    show().node_property()
    
    // To show properties of all edge schemas in the current graphset
    show().edge_property()
    
    // To show properties of a certain node schema in the current graphset
    show().node_property(@<schema>)
    
    // To show properties of a certain edge schema in the current graphset
    show().edge_property(@<schema>)
    

    Create Property

    string is used by default if data type is ignored when creating property.

    Syntax:

    // To create a node property under a certain node schema in the current graphset
    create().node_property(@<schema>, "<name>", <type?>, "<desc?>")
    
    // To create a node property under all node schemas in the current graphset
    create().node_property(@*, "<name>", <type?>, "<desc?>")
    
    // To create an edge property under a certain edge schema in the current graphset
    create().edge_property(@<schema>, "<name>", <type?>, "<desc?>")
    
    // To create an edge property under all edge schemas in the current graphset
    create().edge_property(@*, "<name>", <type?>, "<desc?>")
    
    // To create multiple node/edge properties by using the four methods above
    create()
      .node_property(@<schema>, "<name>", <type?>, "<desc?>")
      .node_property(@*, "<name>", <type?>, "<desc?>")
      .edge_property(@<schema>, "<name>", <type?>, "<desc?>")
      .edge_property(@*, "<name>", <type?>, "<desc?>")
    

    Example: Using one UQL to create node properties "card balance" and "level" under @card and edge property "time" for all edge schemas

    create().node_property(@card, "sum," double, "card balance")
      .node_property(@card, "level", int, "card level")
      .edge_property(@*, "time", datetime)
    

    Example: Using one UQL to create edge properties "transaction number", "time" and "amount" under @transaction

    create().edge_property(@transaction, "no", "", "transaction number")
      .edge_property(@transaction, "time", datetime)
      .edge_property(@transaction, "amount", double)
    

    Example: Using one UQL to create node properties "card balance", "level" under @card and edge properties "transaction number", "time" and "amount" under @transaction

    create().node_property(@card, "sum", double, "card balance")
      .node_property(@card, "level", int, "card level")
      .edge_property(@transaction, "no", "", "transaction number")
      .edge_property(@transaction, "time", datetime)
      .edge_property(@transaction, "amount", double)
    

    Alter Property (Name, Description)

    Syntax:

    // To modify the name, description of a certain node property under a certain node schema in the current graphset
    alter().node_property(@<schema>.<property>)
      .set({name: "<new_name?>", description: "<new_desc?>"})
    
    // To modify the name, description of a certain node property (if has) under all node schemas in the current graphset
    alter().node_property(@*.<property>)
      .set({name: "<new_name?>", description: "<new_desc?>"})
    
    // To modify the name, description of a certain edge property under a certain edge schema in the current graphset
    alter().edge_property(@<schema>.<property>)
      .set({name: "<new_name?>", description: "<new_desc?>"})
    
    // To modify the name, description of a certain edge property (if has) under all edge schemas in the current graphset
    alter().edge_property(@*.<property>)
      .set({name: "<new_name?>", description: "<new_desc?>"})
    

    Example: Rename @card property "sum" as "balance"

    alter().node_property(@card.sum)
      .set({name: "balance"})
    

    Example: Rename property "time" as "createTime" for all edges

    alter().edge_property(@*.time)
      .set({name: "createTime"})
    

    Drop Property

    User may delete properties that are no longer needed to save disk space. Deleting property operation can be executed in real time, and there will not be a considerable wait time. Once executed, the property is deleted immediately.

    Except for system properties _id, _uuid, _from, _to, _from_uuid and _to_uuid which are not allowed to be deleted, all the other properties of schema can be deleted.

    Syntax:

    // To delete a certain node property under a certain node schema from the current graphset
    drop().node_schema(@<schema>.<property>)
    
    // To delete a certain node property (if has) under all node schemas from the current graphset
    drop().node_schema(@*.<property>)
    
    // To delete a certain edge property under a certain edge schema from the current graphset
    drop().edge_schema(@<schema>.<property>)
    
    // To delete a certain edge property (if has) under all edge schemas from the current graphset
    drop().edge_schema(@*.<property>)
    
    // To delete multiple node/edge properties by using the four methods above
    drop()
      .node_schema(@<schema>.<property>)
      .node_schema(@*.<property>)
      .edge_schema(@<schema>.<property>)
      .edge_schema(@*.<property>)
    

    Example: Delete node property "branch" under @card and edge property "time" for all edges

    drop().node_property(@card.branch).edge_property(@*.time)
    

    Example: Delete @default edge property "test"

    drop().edge_property(@default.test)
    
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