hbReading (Type of variable)

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Properties specific to the description of hbReading variables
WLanguage functions that use the hbReading type

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hbReading (Type of variable)

In french: hbLecture

The hbReading type is used to define the characteristics of a read operation. The characteristics of this read operation can be defined and modified by several WLanguage properties.

Remark: See Declaring a variable for more details on the declaration of this type of variable and the use of WLanguage properties.

Example

// Connection
Connection is hbConnection
Connection..Server = "MyServer"
// Description of data to read
Reading is hbReading
Reading..Row = "post1"
Reading..Version = 2
// Column description
Col is hbColumn
Col..Family = "Post"
Add(Reading..Column, Col)
// Read data
MyResult is array of hbCells = hbRead(Connection, "blog", Reading)
// Display the data read
FOR EACH Cell OF MyResult DO
Trace("Column: " + Cell..Column..Qualifier + "; Value: " + ...
Cell..Value + "; timestamp: " + Cell..Timestamp)
END

Remarks

Properties specific to the description of hbReading variables

The following properties can be used to describe the read operation to perform:

Property name	Type used	Effect

Column	Array of hbColumn	Description of columns to read. If the array is empty, the entire row is read.
StartTimestamp	DateTime	Minimum date of versions to read (optional). If this property is specified, ..EndTimestamp must also be specified. The data whose date is greater than or equal to this date will be read.
EndTimestamp	DateTime	Maxmum date of versions to read (optional). The data whose date is less than or equal to this date will be read.
Row	Buffer	Identifier of the row (record).
Version	Integer	Minimum number of versions to read (optional).

Remark: These properties can be handled by using one of the following syntaxes:

<Variable name>..<Property name>
<Variable name>.<Property name>

WLanguage functions that use the hbReading type


Versions 21 and later hbRead New in version 21 hbRead hbRead	Reads the cells (values of items) of a row (record) in a HBase table.