channel()
Here’s how to use channel() function.
channel()
Description:
Create a channel.
Syntax:
|
channel() |
Create a channel. |
Note:
The function creates a channel.
Return value:
Channel
Example:
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A |
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1 |
=demo.cursor("select * from SCORES where CLASS = 'Class one'") |
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2 |
=channel() |
Create a channel. |
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3 |
>A2.select(STUDENTID==1) |
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4 |
>A2.fetch() |
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5 |
=A1.push(A2) |
Push data in A1’s cursor to A2’s channel. |
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6 |
=A1.fetch() |
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7 |
=A2.result() |
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channel(cs)
Description:
Create a channel and push data in a specified cursor into it.
Syntax:
channel(cs)
Note:
The function creates a channel, pushes data in cursor cs into it, and returns a channel. This is equivalent to cs.push(channel()).
Parameter:
|
cs |
A cursor. |
Return value:
Channel
Example:
|
|
A |
|
|
1 |
=demo.cursor("select * from SCORES where CLASS = 'Class one'") |
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2 |
=channel(A1) |
Create a channel and be ready to push data in A1’s cursor into the new channel, which is equivalent to =A1.push(channel()), and return a channel. |
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3 |
>A2.select(STUDENTID==1) |
Attach a computation to A2’s channel. |
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4 |
>A2.fetch() |
Keep data in A2’s channel. |
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5 |
=A1.fetch() |
Push data into A2’s channel when data is fetched from the cursor. |
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6 |
=A2.result() |
Get data from A2’s channel.
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channel(ch)
Description:
Create a channel and push data in another channel into it.
Syntax:
channel(ch)
Note:
The function creates a channel, pushes data in channel ch into it, and returns a channel. This is equivalent to ch.push(channel()).
Parameter:
|
ch |
A channel. |
Return value:
Channel
Example:
|
|
A |
|
|
1 |
=demo.cursor("select * from SCORES where CLASS = 'Class one'") |
|
|
2 |
=channel() |
Create a channel. |
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3 |
=channel(A2) |
Create a channel and be ready to push data in A2’s channel into the new channel, which is equivalent to =A2.push(channel()). |
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4 |
>A2.select(STUDENTID==1) |
Attach a computation to A2’s channel to select records where STUDENTID is 1. |
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5 |
>A3.select(STUDENTID==2) |
Attach a computation to A3’s channel to select records where STUDENTID is 2. |
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6 |
=A2.fetch() |
Keep the current data in A2’s channel . |
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7 |
=A3.fetch() |
Keep the current data in A3’s channel. |
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8 |
=A1.push(A2) |
Ready to push A1’s cursor into Channel A2. |
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9 |
=A1.fetch() |
Perform the push action defined in A8 when data is fetched from the cursor. |
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10 |
=A2.result() |
Get data from channel A2.
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11 |
=A3.result() |
Get data from channel A3.
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