Selects a single blob column in a row in the table specified in RestOfSelectStatement.
SELECTBLOB RestOfSelectStatement
{USING TransactionObject} ;
Parameter |
Description |
|---|---|
RestOfSelectStatement |
The rest of the SELECT statement (the INTO, FROM, and WHERE clauses). |
TransactionObject |
The name of the transaction object that identifies the database containing the table. This clause is required only for transaction objects other than the default (SQLCA). |
An error occurs if the SELECTBLOB statement returns more than one row.
Error handling
It is good practice to test the success/failure code
after executing an SELECTBLOB statement. To make
sure the update affected at least one row, check the SQLNRows property of SQLCA or the transaction object.
The SQLCode or SQLDBCode property will
not indicate the success or failure of the SELECTBLOB statement.
You can include an indicator variable in the host variable list (target parameters) in the INTO clause to check for an empty blob (a blob of zero length) and conversion errors.
The following statements select the blob column Emp_pic from a row in the Employee table and set the picture p_1 to the bitmap in Emp_id_pic (the transaction object Emp_tran is used):
Blob Emp_id_pic
SELECTBLOB Emp_pic
INTO :Emp_id_pic
FROM Employee
WHERE Employee.Emp_Num = 100
USING Emp_tran ;
p_1.SetPicture(Emp_id_pic)
The blob Emp_id_pic requires a colon to indicate that it is a host (PowerScript) variable when you use it in the INTO clause of the SELECTBLOB statement.
