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IDS Forum

PREPARE in SPL

Posted By: DAY BRAD
Date: Friday, 6 June 2014, at 11:10 a.m.

Please help clear up some confusion. I see that I can use the PREPARE statement in SPL, assigning a statement_id to the PREPAREd statement. This sounds great, as it allows me to construct a SQL statement with different table names depending on whatever logic I need.

The problem is, it seems that I cannot then EXECUTE statement_id in SPL. That seems to be only available in ESQL/C.

Why can I PREPARE a statement but not EXECUTE it? What is the point?

How can I use dynamic SQL in SPL, other than the EXECUTE IMMEDIATE statement? I know EXECUTE IMMEDIATE will work, but the problems with this are that a) I have to keep the statements in text form inside variables for the duration of the procedure; b) I can't use INTO and USING clauses, so I have to rebuild the statement each time the WHERE clause changes; and c) the statement will be reevaluated (syntax check, parse, optimized) each time that the statement is executed, negating the benefit of a PREPAREd statement.

If I could do the PREPARE / EXECUTE method, I could do:

let summary_tbl = "jun2014_data_summary";
let detail_tbl = "jun2014_data_detail";
let tmp_sql_stmt = "SELECT a.col1, a.col2, .... FROM " || summary_tbl || " a where summary_key = ?";
prepare sel_summary from tmp_sql_stmt;
let tmp_sql_stmt = "SELECT x.col1, x.col2 ... FROM " || detail_tbl || " x where detail_key = ?;
prepare sel_detail from tmp_sql_stmt;
.
.
.
let sum_key = 1332;
let dtl_key = 113904;
execute sel_summary into p_sum_col1, p_sum_col2, ... using sum_key;
execute sel_detail into p_dtl_col1, p_dtl_col2, ... using dtl_key;

With EXECUTE IMMEDIATE, I have to do:

let sum_key = 1332;
let sql_sel_summary = "SELECT a.col1, a.col2, ... INTO p_sum_col1, p_sum_col2, ... FROM " || summary_tbl || " a WHERE summary_key = " || sum_key;
let dtl_key = 113904;
let sel_sel_detail = "SELECT x.col1, x.col2 ... INTO p_dtl_col1, p_dtl_col2, ... FROM " || detail_tbl || " x where detail_key = " || dtl_key;
execute immediate sql_sel_summary;
execute immediate sql_sel_detail;

OK, yes, I could make strings that contain sub-parts of the queries, and string them together as:

execute immediate sel_summary_cols || sel_summary_into || sel_summary_where;

but still, this doesn't get around the problem of the repetitive syntax checking, parsing, optimizing, freeing. Surely there has to be a better way to to dynamic SQL inside of SPL.

BTW, this is IDS 11.70 on Solaris 10.

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