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: For more details on the declaration of this type of variable and the use of WLanguage properties, see
Declaring a variable.
// 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 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. |
| EndTimestamp | DateTime | Maxmum date of versions to read (optional). Data with a date earlier than or equal to this date will be read. |
| Row | Buffer | Identifier of the row (record). |
| StartTimestamp | DateTime | Minimum date of versions to read (optional). If this property is specified, the EndTimestamp property must also be specified. Data with a date later than or equal to this date will be read. |
| Version | Integer | Minimum number of versions to read (optional). |
WLanguage functions that use the hbReading type
| |
| hbRead | Reads cells (values of items) of a row (record) in an HBase table. |