Panic.. with substitution method

Question

Hi all, I would like use substitution method to do a dynamic check, but I really don't know how to do that. This is my first serious approach with substitution method.
What I want to do is the following:
I would like to do an insert into a fixed table reading source numeric fields only aggregating those. my English is so bad, so i believe is better explain with an example.
the fixed table is something like :
CREATE TABLE te001_se_chk (
d_ela DATE NOT NULL, -- elaboration date
n_seq NUMBER NOT NULL, -- source table id
n_src_row NUMBER(9,0) NULL,
n_trg_row NUMBER(9,0) NULL,
n_src_val_1 NUMBER(19,4) NULL,
n_trg_val_1 NUMBER(19,4) NULL,
n_src_val_2 NUMBER(19,4) NULL,
n_trg_val_2 NUMBER(19,4) NULL,
n_src_val_3 NUMBER(19,4) NULL,
n_trg_val_3 NUMBER(19,4) NULL,
c_res VARCHAR2(2) NULL,
n_prg_se_chk NUMBER(5,0) NOT NULL
I have to read source table (as400 file), find the first 3 numeric fields of the source table and valorize n_src_val_1 ,n_src_val_2 ,n_src_val_3 fields with a sum() aggregation, the n_src_row field will be filled with the count(*) of the source table.
If source table has the following record inside:
1,2,'a',3
2,4,'b',6
3,6,'c',9
the n_src_row will be 3
the n_src_val_1 will be 6
the n_src_val_2 will be 12
the n_src_val_1 will be 18
If the source table as only 1 numeric fields I would like to fill n_src_val_1 field and n_src_row only.
Is it possible to do that with procedure or customized KM? If yes, how can I do that ?
Thanks

Answer 1

With the example you gave, I thought- 1st, 2nd & 4th fields are the numeric fields.
Is it possible that the numeric fields in a record could be scattered?
To check numeric ness, you can use SQL Functions directly/indirectly, depending on- Which database engine you're using.
For instance-
if you're using SQL Server, you may use- IsNumeric. ISNUMERIC returns 1 when the input expression evaluates to a valid numeric data type; otherwise it returns 0.
if you're using Oracle, select length(translate(trim(column_name),' +-.0123456789',' ')) from dual. This gives you a 0 if it's a numeric or >0 for non-numeric(actually gives the count of non numeric characters)