Stored procedure calculating from a query
this example from a Well House Consultants training course
Source code: stp6 Module: S163
# We are defining a procedure which will include semicolons
# so change to some other delimiter for our instructions
# Clean up - get rid of any previous procedure of this name
DROP PROCEDURE IF EXISTS count_member !!!
# Define the procedure ...
CREATE PROCEDURE count_member() READS SQL DATA
# Declare the type of some regular variables
DECLARE i INT;
DECLARE itsdone INT;
DECLARE present_name TEXT;
# We're going to do some SQL, so set up a cursor -
# this is rather like a file handler; we'll use the
# cursor to know where we are in reading back the
# result if the query
DECLARE pointer CURSOR FOR select name from partner;
# We also need to tell MySQL what to do when it reaches
# the end of the result set, and to initialise the variable
# we used so it knows it's not at the end before it starts!
DECLARE CONTINUE HANDLER FOR NOT FOUND SET itsdone=1;
# Parse the results on the cursor called 'pointer'
# Get a row, save the column(s) returned
FETCH pointer INTO present_name;
# If we failed to get data because fetch
# triggered the end of cursor handler,
# leave the loop
IF itsdone=1 THEN LEAVE thisloop;
# Do something (very little - it's a demo)
# with what we got
# When we are completely done, make up a result set
# to pass back as a result of calling this procedure.
SELECT CONCAT('There are now ',i,' partners') as rezult;
# End of Procedure
# Signal end of definition to MySQL
# Switch back to normal delimiters
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