func_if.test

视频监控网络部分的协议ddns,的模块的实现代码,请大家大胆指正.

#
# Init section
#
--disable_warnings
drop table if exists t1;
--enable_warnings

#
# Simple IF tests
#

select IF(0,"ERROR","this"),IF(1,"is","ERROR"),IF(NULL,"ERROR","a"),IF(1,2,3)|0,IF(1,2.0,3.0)+0 ;

#
# Test of IF and case-sensitiveness
#
CREATE TABLE t1 (st varchar(255) NOT NULL, u int(11) NOT NULL) ENGINE=MyISAM;
INSERT INTO t1 VALUES ('a',1),('A',1),('aa',1),('AA',1),('a',1),('aaa',0),('BBB',0);
select if(1,st,st) s from t1 order by s;
select if(u=1,st,st) s from t1 order by s;
select if(u=1,binary st,st) s from t1 order by s;
select if(u=1,st,binary st) s from t1 where st like "%a%" order by s;
explain extended select if(u=1,st,binary st) s from t1 where st like "%a%" order by s;

#
# NULLIF test
#
select nullif(u, 1) from t1;
explain extended select nullif(u, 1) from t1;
drop table t1;
select nullif(1,'test');

#
# Bug 2629
#
select NULLIF(NULL,NULL), NULLIF(NULL,1), NULLIF(NULL,1.0), NULLIF(NULL,"test");
select NULLIF(1,NULL), NULLIF(1.0, NULL), NULLIF("test", NULL);

#
# Problem with IF()
#

create table t1 (num  double(12,2));
insert into t1 values (144.54);
select sum(if(num is null,0.00,num)) from t1;
drop table t1;
create table t1 (x int, y int);
insert into t1 values (0,6),(10,16),(20,26),(30,10),(40,46),(50,56);
select min(if(y -x > 5,y,NULL)), max(if(y - x > 5,y,NULL)) from t1;
drop table t1;

#
# BUG#3987
#
create table t1 (a int);
insert t1 values (1),(2);
select if(1>2,a,avg(a)) from t1;
drop table t1;

#
# Bug #5595  NULLIF() IS NULL returns false if NULLIF() returns NULL
#
SELECT NULLIF(5,5) IS NULL, NULLIF(5,5) IS NOT NULL;

#
# Bug #9669 Ordering on IF function with FROM_UNIXTIME function fails
#
CREATE TABLE `t1` (
  `id` int(11) NOT NULL ,
  `date` int(10) default NULL,
  `text` varchar(32) NOT NULL
);
INSERT INTO t1 VALUES (1,1110000000,'Day 1'),(2,1111000000,'Day 2'),(3,1112000000,'Day 3');
SELECT id, IF(date IS NULL, '-', FROM_UNIXTIME(date, '%d-%m-%Y')) AS date_ord, text FROM t1 ORDER BY date_ord ASC;
SELECT id, IF(date IS NULL, '-', FROM_UNIXTIME(date, '%d-%m-%Y')) AS date_ord, text FROM t1 ORDER BY date_ord DESC;
DROP TABLE t1;


#
# Test for bug #11142: evaluation of NULLIF when the first argument is NULL
#

CREATE TABLE t1 (a CHAR(10));
INSERT INTO t1 VALUES ('aaa'), (NULL), (''), ('bbb');

SELECT a, NULLIF(a,'') FROM t1;
SELECT a, NULLIF(a,'') FROM t1 WHERE NULLIF(a,'') IS NULL;

DROP TABLE t1;

# End of 4.1 tests

#
# Bug #16272 IF function with decimal args can produce wrong result
#
create table t1 (f1 int, f2 int);
insert into t1 values(1,1),(0,0);
select f1, f2, if(f1, 40.0, 5.00) from t1 group by f1 order by f2;
drop table t1;

#
# Bug#24532 (The return data type of IS TRUE is different from similar
# operations)
#
# IF(x, unsigned, unsigned) should be unsigned.
#

select if(0, 18446744073709551610, 18446744073709551610);