Reputation: 3294
I have a plpgsql block which generates a dynamic update query as :
CREATE OR REPLACE FUNCTION fun_lenght_test () RETURNS VOID AS $BODY$
BEGIN
/*
some code here
*/
dyn_sql = 'UPDATE';
IF SUBSTR(que_col_name, 0, 8) = 'pro_ans' THEN
dyn_sql = dyn_sql || ' profile_answers ';
ELSIF SUBSTR(que_col_name, 0, 8) = 'reg_ans' THEN
dyn_sql = dyn_sql || ' reg_answers ';
ELSIF SUBSTR(que_col_name, 0, 8) = 'tvl_ans' THEN
dyn_sql = dyn_sql || ' tvl_answers ';
END IF;
dyn_sql = dyn_sql|| 'SET' || ' ' || que_col_name || ' = ' || NEW_VALUE_FOR_COLUMN ;
dyn_sql = dyn_sql || ' WHERE' ;
IF SUBSTR(que_col_name, 0, 8) = 'pro_ans' THEN
dyn_sql = dyn_sql || ' pro_ans_frn_pro_id = (SELECT pro_ans_frn_pro_id FROM profile_answers JOIN registrations ON (pro_ans_frn_pro_id = reg_frn_pro_id) WHERE reg_id ';
ELSIF SUBSTR(que_col_name, 0, 8) = 'reg_ans' THEN
dyn_sql = dyn_sql || ' reg_answers WHERE reg_ans_frn_reg_id ';
ELSIF SUBSTR(que_col_name, 0, 8) = 'tvl_ans' THEN
dyn_sql = dyn_sql || ' tvl_answers WHERE tvl_ans_frn_reg_id ';
END IF;
IF SUBSTR(que_col_name, 0, 8) = 'pro_ans' THEN
dyn_sql = dyn_sql || '= ' || CAST(temp_reg AS VARCHAR) || ');';
ELSE
dyn_sql = dyn_sql || '= ' || CAST(temp_reg AS VARCHAR) || ';';
/* want to execute this update dynamic query */
/*
some code here
*/
END;
$BODY$
LANGUAGE plpgsql
Can you please help me executing this dynamic Update query . Thanks In advance.
Upvotes: 1
Views: 2388
Reputation: 259
CREATE OR REPLACE FUNCTION fun_lenght_test () RETURNS VOID AS $BODY$
DECLARE
dyn_sql varchar;
BEGIN
/*
some code here
*/
dyn_sql = 'UPDATE';
IF SUBSTR(que_col_name, 0, 8) = 'pro_ans' THEN
dyn_sql = dyn_sql || ' profile_answers ';
ELSIF SUBSTR(que_col_name, 0, 8) = 'reg_ans' THEN
dyn_sql = dyn_sql || ' reg_answers ';
ELSIF SUBSTR(que_col_name, 0, 8) = 'tvl_ans' THEN
dyn_sql = dyn_sql || ' tvl_answers ';
END IF;
dyn_sql = dyn_sql|| 'SET' || ' ' || que_col_name || ' = ' || NEW_VALUE_FOR_COLUMN ;
dyn_sql = dyn_sql || ' WHERE' ;
IF SUBSTR(que_col_name, 0, 8) = 'pro_ans' THEN
dyn_sql = dyn_sql || ' pro_ans_frn_pro_id = (SELECT pro_ans_frn_pro_id FROM profile_answers JOIN registrations ON (pro_ans_frn_pro_id = reg_frn_pro_id) WHERE reg_id ';
ELSIF SUBSTR(que_col_name, 0, 8) = 'reg_ans' THEN
dyn_sql = dyn_sql || ' reg_answers WHERE reg_ans_frn_reg_id ';
ELSIF SUBSTR(que_col_name, 0, 8) = 'tvl_ans' THEN
dyn_sql = dyn_sql || ' tvl_answers WHERE tvl_ans_frn_reg_id ';
END IF;
IF SUBSTR(que_col_name, 0, 8) = 'pro_ans' THEN
dyn_sql = dyn_sql || '= ' || CAST(temp_reg AS VARCHAR) || ');';
ELSE
dyn_sql = dyn_sql || '= ' || CAST(temp_reg AS VARCHAR) || ';';
END IF;
END; $BODY$ LANGUAGE plpgsql
I am sorry to know what do you want, but this can run...
Upvotes: 1