SAP HANA Predictive Analysis Library (PAL)

Table 4:
Name intArgs doubleArgs stringArgs
THREAD_NUMBER 1
SUPPORT 0.2
VAR_NAME hello
2.5.2 Exception Handling
Exceptions thrown by a PAL function can be caught by the exception handler in a SQLScript procedure with
AFL error code 423.
The following shows an example of handling the exceptions thrown by an ARIMA function. In the example, you
are generating the "DM_PAL".PAL_ARIMAXTRAIN_PROC procedure to call an ARIMA function, whose input
data table is empty. You create a SQLScript procedure "DM_PAL".PAL_ARIIMAX_NON_EXCEPTION_PROC
which calls the "DM_PAL".PAL_ARIMAXTRAIN_PROC procedure. When you call the
"DM_PAL".PAL_ARIIMAX_NON_EXCEPTION_PROC procedure, the exception handler in the procedure will
catch the errors thrown by the function.
SET SCHEMA DM_PAL;
DROP TYPE PAL_ARIMAX_DATA_T;
CREATE TYPE PAL_ARIMAX_DATA_T AS TABLE(
"TIMESTAMP" INTEGER,
"X1" DOUBLE,
"Xreg" DOUBLE
);
DROP TYPE PAL_ARIMAX_CONTROL_T;
CREATE TYPE PAL_ARIMAX_CONTROL_T AS TABLE(
"NAME" VARCHAR (50),
"INTARGS" INTEGER,
"DOUBLEARGS" DOUBLE,
"STRINGARGS" VARCHAR (100)
);
DROP TYPE PAL_ARIMAX_MODEL_T;
CREATE TYPE PAL_ARIMAX_MODEL_T AS TABLE(
"NAME" VARCHAR (50),
"VALUE" VARCHAR (5000)
);
DROP TABLE PAL_ARIMAX_PDATA_TBL;
CREATE COLUMN TABLE PAL_ARIMAX_PDATA_TBL("POSITION" INT, "SCHEMA_NAME"
NVARCHAR(256), "TYPE_NAME" NVARCHAR(256), "PARAMETER_TYPE" VARCHAR(7));
INSERT INTO PAL_ARIMAX_PDATA_TBL VALUES (1,'DM_PAL', 'PAL_ARIMAX_DATA_T','IN');
INSERT INTO PAL_ARIMAX_PDATA_TBL VALUES(2,'DM_PAL', 'PAL_ARIMAX_CONTROL_T','IN');
INSERT INTO PAL_ARIMAX_PDATA_TBL VALUES(3,'DM_PAL', 'PAL_ARIMAX_MODEL_T','OUT');
CALL SYS.AFLLANG_WRAPPER_PROCEDURE_DROP('DM_PAL', 'PAL_ARIMAXTRAIN_PROC');
CALL SYS.AFLLANG_WRAPPER_PROCEDURE_CREATE('AFLPAL', 'ARIMATRAIN', 'DM_PAL',
'PAL_ARIMAXTRAIN_PROC',PAL_ARIMAX_PDATA_TBL);
DROP PROCEDURE "DM_PAL".PAL_ARIIMAX_NON_EXCEPTION_PROC;
CREATE PROCEDURE PAL_ARIIMAX_NON_EXCEPTION_PROC(IN training_data
PAL_ARIMAX_DATA_T, IN para_args PAL_ARIMAX_CONTROL_T)
LANGUAGE SQLSCRIPT AS
BEGIN
-- used to catch exceptions
DECLARE EXIT HANDLER FOR SQLEXCEPTION
SELECT ::SQL_ERROR_CODE, ::SQL_ERROR_MESSAGE FROM DUMMY;
CALL "DM_PAL".PAL_ARIMAXTRAIN_PROC(:training_data, :para_args, result_model);
END;
DROP TABLE PAL_ARIMAX_DATA_TBL;
12 P U B L I C
SAP HANA Predictive Analysis Library (PAL)
Getting Started with PAL