Expressions in component parameters

When used for a component parameter, the following objects are of special interest:

Table 1. Special objects usable in Expressions

Object	Value
config	The Interface configuration object of the component.
mc	The MetamergeConfig object of the Config instance (config.getMetamergeConfig()).
work	The Work entry of the AssemblyLine.
task	The AssemblyLine object.

As an example, take a JDBC Connector with the Table Name parameter set to "Accounts". We could then click on the SQL Select parameter label or the Open parameter value dialog button adjacent to the field, choose Text w/substitution, and then enter this into the large text field at the bottom of the dialog:

select * from {config.jdbcTable} 

select * from Accounts

SELECT {JavaScript<<EOF

  var str = new Array();
  str[0] = "A";
  str[1] = "B";
  return str.join(",");
EOF

} FROM {property:mystore.tablename} WHERE A = '{work.uniqueID}'

SELECT A,B FROM Accounts WHERE A = '42'

1. Press the Open parameter value dialog button adjacent to the field (or click on the Parameter label) and select Text w/substitution to open the Expressions dialog while in the parameter input field. You may enter your Expression in the large text field in this dialog. Click OK to enter your Expression.

2. Type the special preamble, @SUBSTITUTE, manually into the parameter input field, followed by the Expression. For example:

   @SUBSTITUTEhttp://{property.myProperties:HTTP.Host}/

   This last method of entering expressions directly is not recommended; use the Expression editor instead.

Parent topic: Expressions