############### include/query_cache_sql_prepare.inc ################
#
# This is to see how statements prepared via the PREPARE SQL command
# go into the query cache: if using parameters they cannot; if not
# using parameters they can.
# Query cache is abbreviated as "QC"
#
# Last update:
# 2007-05-03 ML - Move t/query_cache_sql_prepare.test
#                 to   include/query_cache_sql_prepare.inc
#               - Create two toplevel tests sourcing this routine
#               - Add tests checking that
#                 - another connection gets the same amount of QC hits
#                 - statements running via ps-protocol do not hit QC results
#                   of preceding sql EXECUTEs
#

--source include/have_query_cache.inc
# embedded can't make more than one connection, which this test needs
-- source include/not_embedded.inc

--echo ---- establish connection con1 (root) ----
connect (con1,localhost,root,,test,$MASTER_MYPORT,);
--echo ---- switch to connection default ----
connection default;

set @initial_query_cache_size = @@global.query_cache_size;
set @@global.query_cache_size=100000;
flush status;
--disable_warnings
drop table if exists t1;
--enable_warnings
create table t1(c1 int);
insert into t1 values(1),(10),(100);

# Prepared statements has no parameters, query caching should happen
prepare stmt1 from "select * from t1 where c1=10";
show status like 'Qcache_hits';
execute stmt1;
show status like 'Qcache_hits';
execute stmt1;
show status like 'Qcache_hits';
execute stmt1;
show status like 'Qcache_hits';
# Another prepared statement (same text, same connection), should hit the QC
prepare stmt2 from "select * from t1 where c1=10";
execute stmt2;
show status like 'Qcache_hits';
execute stmt2;
show status like 'Qcache_hits';
execute stmt2;
show status like 'Qcache_hits';
# Another prepared statement (same text, other connection), should hit the QC
--echo ---- switch to connection con1 ----
connection con1;
prepare stmt3 from "select * from t1 where c1=10";
execute stmt3;
show status like 'Qcache_hits';
execute stmt3;
show status like 'Qcache_hits';
execute stmt3;
show status like 'Qcache_hits';
--echo ---- switch to connection default ----
connection default;

# Mixup tests, where statements without PREPARE.../EXECUTE.... meet statements
# with PREPARE.../EXECUTE.... (text protocol). Both statements have the
# same text. QC hits occur only when both statements use the same protocol.
# The outcome of the test depends on the mysqltest startup options
# - with "--ps-protocol"
#   Statements without PREPARE.../EXECUTE.... run as prepared statements
#   with binary protocol. Expect to get no QC hits.
# - without any "--<whatever>-protocol"
#   Statements without PREPARE.../EXECUTE run as non prepared statements
#   with text protocol. Expect to get QC hits.
############################################################################
#
# Statement with PREPARE.../EXECUTE.... first
let $my_stmt= SELECT * FROM t1 WHERE c1 = 100;
eval prepare stmt10 from "$my_stmt";
show status like 'Qcache_hits';
execute stmt10;
show status like 'Qcache_hits';
execute stmt10;
show status like 'Qcache_hits';
eval $my_stmt;
show status like 'Qcache_hits';
--echo ---- switch to connection con1 ----
connection con1;
eval $my_stmt;
show status like 'Qcache_hits';
--echo ---- switch to connection default ----
connection default;
#
# Statement without PREPARE.../EXECUTE.... first
let $my_stmt= SELECT * FROM t1 WHERE c1 = 1;
eval prepare stmt11 from "$my_stmt";
--echo ---- switch to connection con1 ----
connection con1;
eval prepare stmt12 from "$my_stmt";
--echo ---- switch to connection default ----
connection default;
eval $my_stmt;
show status like 'Qcache_hits';
eval $my_stmt;
show status like 'Qcache_hits';
execute stmt11;
show status like 'Qcache_hits';
--echo ---- switch to connection con1 ----
connection con1;
execute stmt12;
show status like 'Qcache_hits';
--echo ---- switch to connection default ----
connection default;

# Prepared statement has parameters, query caching should not happen
prepare stmt1 from "select * from t1 where c1=?";
show status like 'Qcache_hits';
set @a=1;
execute stmt1 using @a;
show status like 'Qcache_hits';
execute stmt1 using @a;
show status like 'Qcache_hits';
--echo ---- switch to connection con1 ----
connection con1;
set @a=1;
prepare stmt4 from "select * from t1 where c1=?";
execute stmt4 using @a;
show status like 'Qcache_hits';
--echo ---- switch to connection default ----
connection default;

# See if enabling/disabling the query cache between PREPARE and
# EXECUTE is an issue; the expected result is that the query cache
# will not be used.
# Indeed, decision to read/write the query cache is taken at PREPARE
# time, so if the query cache was disabled at PREPARE time then no
# execution of the statement will read/write the query cache.
# If the query cache was enabled at PREPARE time, but disabled at
# EXECUTE time, at EXECUTE time the query cache internal functions do
# nothing so again the query cache is not read/written. But if the
# query cache is re-enabled before another execution then that
# execution will read/write the query cache.

# QC is enabled at PREPARE
prepare stmt1 from "select * from t1 where c1=10";
# then QC is disabled at EXECUTE
# Expect to see no additional Qcache_hits.
set global query_cache_size=0;
show status like 'Qcache_hits';
execute stmt1;
show status like 'Qcache_hits';
execute stmt1;
show status like 'Qcache_hits';
execute stmt1;
show status like 'Qcache_hits';
# The QC is global = affects also other connections.
# Expect to see no additional Qcache_hits.
--echo ---- switch to connection con1 ----
connection con1;
execute stmt3;
show status like 'Qcache_hits';
execute stmt3;
show status like 'Qcache_hits';
execute stmt3;
show status like 'Qcache_hits';
#
# then QC is re-enabled for more EXECUTE.
--echo ---- switch to connection default ----
connection default;
set global query_cache_size=100000;
# Expect to see additional Qcache_hits.
# The fact that the QC was temporary disabled should have no affect
# except that the first execute will not hit results from the
# beginning of the test (because QC has been emptied meanwhile by
# setting its size to 0).
execute stmt1;
show status like 'Qcache_hits';
execute stmt1;
show status like 'Qcache_hits';
execute stmt1;
show status like 'Qcache_hits';
# The QC is global = affects also other connections.
--echo ---- switch to connection con1 ----
connection con1;
execute stmt3;
show status like 'Qcache_hits';
execute stmt3;
show status like 'Qcache_hits';
execute stmt3;
show status like 'Qcache_hits';
--echo ---- switch to connection default ----
connection default;
#
# then QC is re-disabled for more EXECUTE.
# Expect to see no additional Qcache_hits.
# The fact that the QC was temporary enabled should have no affect.
set global query_cache_size=0;
show status like 'Qcache_hits';
execute stmt1;
show status like 'Qcache_hits';
execute stmt1;
show status like 'Qcache_hits';
execute stmt1;
show status like 'Qcache_hits';
# The QC is global = affects also other connections.
--echo ---- switch to connection con1 ----
connection con1;
execute stmt3;
show status like 'Qcache_hits';
execute stmt3;
show status like 'Qcache_hits';
execute stmt3;
show status like 'Qcache_hits';
#

--echo ---- switch to connection default ----
connection default;
# QC is disabled at PREPARE
set global query_cache_size=0;
prepare stmt1 from "select * from t1 where c1=10";
--echo ---- switch to connection con1 ----
connection con1;
prepare stmt3 from "select * from t1 where c1=10";
--echo ---- switch to connection default ----
connection default;
# then QC is enabled at EXECUTE
set global query_cache_size=100000;
show status like 'Qcache_hits';
execute stmt1;
show status like 'Qcache_hits';
execute stmt1;
show status like 'Qcache_hits';
execute stmt1;
show status like 'Qcache_hits';
# The QC is global = affects also other connections.
--echo ---- switch to connection con1 ----
connection con1;
show status like 'Qcache_hits';
execute stmt3;
show status like 'Qcache_hits';
execute stmt3;
show status like 'Qcache_hits';
execute stmt3;
show status like 'Qcache_hits';
--echo ---- switch to connection default ----
connection default;
#
# QC is disabled at PREPARE
set global query_cache_size=0;
prepare stmt1 from "select * from t1 where c1=?";
# then QC is enabled at EXECUTE
set global query_cache_size=100000;
show status like 'Qcache_hits';
set @a=1;
execute stmt1 using @a;
show status like 'Qcache_hits';
set @a=100;
execute stmt1 using @a;
show status like 'Qcache_hits';
set @a=10;
execute stmt1 using @a;
show status like 'Qcache_hits';


drop table t1;
--echo ---- disconnect connection con1 ----
disconnect con1;

set @@global.query_cache_size=@initial_query_cache_size;
flush status; # reset Qcache status variables for next tests
