T.find(k,…)

Read(1175) Label: find record, specified key value,

Description:

Find the record(s) according to the specified primary key value(s) from an in-memory table.

Syntax:

T.find(k,…)

Note:

The function finds records where the primary key value is k from memory table T.Use binary search if there isn’t an index.

Parameter:

T

An in-memory table

k

The primary key; write multiple keys as a sequence

Option:

@k

Find multiple records according to multiple primary keys and return them as a record sequence; by default the function returns the first-found record whose primary key is k ; write multiple primary keys in the format of [[k1,k2],[...],...]

Return value:

A record/record sequence

Example:

 

A

 

1

=demo.cursor("select EID,NAME,GENDER from employee where EID< 10")

Return a cursor.

2

=A1.memory()

Return an in-memory table.

3

=A2.keys(EID,NAME)

Set EID and NAME as the keys of the in-memory table

4

=A2.find([8,"Megan"])

The two primary keys are written as a sequence.

5

=A2.keys(EID,GENDER)

Set EID and GENDER as the keys of the in-memory table

6

=A2.find@k([[8,"F"],[2,"F"]])

Use @k option to find multiple records.

7

=A2.keys(EID)

Set EID as the key of the in-memory table.

8

=A2.find(3)

Find the record where EID is 3.