SQL - ALTER PROPERTY

The Alter Property command alters a class's property in the schema.

Syntax

ALTER PROPERTY <class>.<property> <attribute-name> <attribute-value>

Where:

• class is the class owner of the property to change
• property is the property name to change
• attribute-name, is the attribute name to alter
• attribute-value, is the new attribute value to set

Supported attribute names are:

• LINKEDCLASS, the linked class name. Accepts a string as value. NULL to remove it
• LINKEDTYPE, the linked type name between those supported:Types. Accepts a string as value. NULL to remove it
• MIN, the minimum value as constraint. Accepts strings, numbers or dates as value. NULL to remove it
• MANDATORY, true if the property is mandatory. Accepts "true" or "false"
• MAX, the maximum value as constraint. Accepts strings, numbers or dates as value. NULL to remove it
• NAME, the property name. Accepts a string as value
• NOTNULL, the property can't be null. Accepts "true" or "false"
• REGEXP the regular expression as constraint. Accepts a string as value. NULL to remove it
• TYPE, the type between those supported:Types Accepts a string as value
• COLLATE, sets the collate to define the strategy of comparison. By default is case sensitive. By setting it yo "ci", any comparison will be case-insensitive
• READONLY the property value is immutable: it can't be changed after the first assignment. Use this with DEFAULT to have immutable values on creation. Accepts "true" or "false"
• CUSTOM Set custom properties. Syntax is <name> = <value>. Example: stereotype = icon
• DEFAULT (Since 2.1) set the default value. Default value can be a value or a function. See below for examples

  Examples

Change the name of the property 'age' in class 'Account' in 'born'

ALTER PROPERTY Account.age NAME born

Set a property as mandatory

ALTER PROPERTY Account.age MANDATORY true

Set a regexp

ALTER PROPERTY Account.gender REGEXP [M|F]

Set a field as case insensitive to comparison

alter property Employee.name collate ci

Set a custom field on property

alter property Foo.bar1 custom stereotype = visible

Set default value to current date

alter property Client.created default sysdate()

Set a unique id can never change

alter property Client.id default uuid() readonly
alter property Client.id readonly true

To create a property use the Create Property command, to remove a property use the Drop Property command.

To know more about other SQL commands look at SQL commands.

This is a command of the Orient console. To know all the commands go to Console-Commands.