r .run( x i ,… )

Read(956) Label: record, compute,

Description:

Compute an expression against a record and return the modified record.

Syntax:

r.run(xi,…)

Note:

The function computes the expression x against record r and return the modified record. Usually, it is used to change the field values of r, for example, when x is col1=col2+1, it will change the field value of col1.

Parameter:

r

A record

xi

An expression, which is generally a field name or a legal expression composed of field names, and in which "~" references the current record

Return value:

The modified record

Example:

 

A

 

1

=[[12,23]].new(~(1):col1,~(2):col2)

 

2

=A1(1).run(col1=col2+1)

3

=A1(1).run(col1=col2+1,col2=col1+col2)

Note:

Difference between r.(x) and r.run(x): r.(x) computes the value of expression x and returns it; r.run(x) modifies r through the computation of x, and returns the modified r.

Related function:

A.run(x1,x2,…xi)

P.run(xi:Fi,…)