get a block of the data stored in the DataInterfaceStream module - Maple Help

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DataInterfaceStream:-Read - get a block of the data stored in the DataInterfaceStream module

Calling Sequence

stream:-Read( number )

Parameters

stream

-

DataInterfaceStream module

number

-

integer; amount of data to read

Description

• 

Read returns the next number elements of data from stream. If stream stores a character type, then the elements are characters and a string is returned. If stream stores binary data, then an element is of type integer[1] and an rtable is returned.

• 

If there are less than number elements in the stream, all the remaining elements are returned, as with the Get command.

Examples

driver:=Database[LoadDriver]:

conn:=driver:-OpenConnectionurl,name,pass:res:=conn:-ExecuteQuerySELECT * FROM stream:res:-Next

true

(1)

res:-GetData1

the quick brown fox jumped over the lazy dog

(2)

res:-GetData2

[   1..127 1-D Array    ]

[ Data Type: integer[1] ]

[ Storage: rectangular  ]

[    Order: C_order     ]

str:=res:-GetData1,stream=true:str:-Type

VARCHAR

(3)

str:-Read5

the q

(4)

str:-Skip5;str:-Read5

brown

(5)

str:=res:-GetData2,stream=true:str:-Type

BINARY

(6)

str:-Read5

1,2,3,4,5

(7)

str:-Skip5;str:-Read5

11,12,13,14,15

(8)

See Also

Database, Database[DataInterfaceStream], Database[DataInterfaceStream][Get], Database[DataInterfaceStream][Skip], Database[usage]


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