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dc719597ee
This change takes into account a column's GENERATED ALWAYS AS
expression dependcy on sql_mode's PAD_CHAR_TO_FULL_LENGTH and
NO_UNSIGNED_SUBTRACTION flags.
Indexed virtual columns as well as persistent generated columns are
now not allowed to have such dependencies to avoid inconsistent data
or index files on sql_mode changes.
So an error is now returned in cases like this:
CREATE OR REPLACE TABLE t1
(
a CHAR(5),
v VARCHAR(5) AS (a) PERSISTENT -- CHAR->VARCHAR or CHAR->TEXT = ERROR
);
Functions RPAD() and RTRIM() can now remove dependency on
PAD_CHAR_TO_FULL_LENGTH. So this can be used instead:
CREATE OR REPLACE TABLE t1
(
a CHAR(5),
v VARCHAR(5) AS (RTRIM(a)) PERSISTENT
);
Note, unlike CHAR->VARCHAR and CHAR->TEXT this still works,
not RPAD(a) is needed:
CREATE OR REPLACE TABLE t1
(
a CHAR(5),
v CHAR(5) AS (a) PERSISTENT -- CHAR->CHAR is OK
);
More sql_mode flags may affect values of generated columns.
They will be addressed separately.
See comments in sql_mode.h for implementation details.
316 lines
6.6 KiB
Text
316 lines
6.6 KiB
Text
SET @@session.storage_engine = 'InnoDB';
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create table t1 (a int,
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b int as (a/10),
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c int as (a/10) persistent);
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create table t2 (a timestamp);
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create trigger trg1 before insert on t1 for each row
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begin
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if (new.b < 10) then
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set new.a:= 100;
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set new.b:= 9;
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set new.c:= 9;
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end if;
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if (new.c > 50) then
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set new.a:= 500;
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end if;
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end|
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create trigger trg2 after insert on t1 for each row
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begin
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if (new.b >= 60) then
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insert into t2 values (now());
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end if;
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end|
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create function f1()
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returns int
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begin
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declare sum1 int default '0';
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declare cur1 cursor for select sum(b) from t1;
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open cur1;
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fetch cur1 into sum1;
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close cur1;
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return sum1;
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end|
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set sql_warnings = 1;
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insert into t1 (a) values (200);
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select * from t1;
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a b c
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200 20 20
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select * from t2;
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a
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insert into t1 (a) values (10);
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select * from t1;
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a b c
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200 20 20
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100 10 10
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select * from t2;
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a
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insert into t1 (a) values (600);
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select * from t1;
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a b c
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200 20 20
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100 10 10
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500 50 50
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select * from t2;
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a
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select f1();
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f1()
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80
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set sql_warnings = 0;
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drop trigger trg1;
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drop trigger trg2;
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drop table t2;
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create procedure p1()
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begin
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declare i int default '0';
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create table t2 like t1;
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insert into t2 (a) values (100), (200);
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begin
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declare cur1 cursor for select sum(c) from t2;
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open cur1;
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fetch cur1 into i;
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close cur1;
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if (i=30) then
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insert into t1 values (300,default,default);
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end if;
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end;
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end|
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delete from t1;
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call p1();
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select * from t2;
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a b c
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100 10 10
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200 20 20
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select * from t1;
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a b c
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300 30 30
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drop table t1,t2;
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drop procedure p1;
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#
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# MDEV-3845 values of virtual columns are not computed for triggers
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#
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CREATE TABLE t1 (
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a INTEGER UNSIGNED NULL DEFAULT NULL,
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b INTEGER UNSIGNED GENERATED ALWAYS AS (a) VIRTUAL
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);
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CREATE TABLE t2 (c INTEGER UNSIGNED NOT NULL);
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CREATE TRIGGER t1_ins_aft
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AFTER INSERT
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ON t1
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FOR EACH ROW
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BEGIN
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INSERT INTO t2 (c) VALUES (NEW.b);
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END |
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CREATE TRIGGER t1_del_bef
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BEFORE DELETE
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ON t1
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FOR EACH ROW
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BEGIN
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INSERT INTO t2 (c) VALUES (OLD.b);
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END |
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INSERT INTO t1 (a) VALUES (1), (2), (3);
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SELECT * FROM t2;
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c
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1
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2
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3
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DELETE FROM t1;
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SELECT * FROM t2;
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c
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1
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2
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3
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1
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2
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3
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DROP TRIGGER t1_ins_aft;
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DROP TRIGGER t1_del_bef;
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DROP TABLE t1,t2;
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create table t1 (i int, t time not null, vt time(4) as (t) virtual);
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create trigger trg before update on t1 for each row set @a = 1;
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insert ignore into t1 (i) values (1);
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Warnings:
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Warning 1364 Field 't' doesn't have a default value
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drop table t1;
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#
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# Examine the number of times triggers are recalculated for updates
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#
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SET sql_mode = 'NO_ENGINE_SUBSTITUTION';
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CREATE TABLE t1 (
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a INTEGER UNSIGNED NULL DEFAULT NULL,
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b CHAR(10) NULL DEFAULT NULL,
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c blob NULL DEFAULT NULL,
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blob_a blob GENERATED ALWAYS AS (last_value(@a:=@a+1,a)) VIRTUAL,
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blob_b blob GENERATED ALWAYS AS (last_value(@b:=@b+1,b)) VIRTUAL,
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blob_c blob GENERATED ALWAYS AS (last_value(@c:=@c+1,c)) VIRTUAL
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);
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CREATE TRIGGER t1_ins
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BEFORE INSERT
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ON t1
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FOR EACH ROW
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BEGIN
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IF NEW.b IS NULL THEN
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SET NEW.b="generated before insert";
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END IF;
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END |
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CREATE TRIGGER t1_update
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BEFORE UPDATE
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ON t1
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FOR EACH ROW
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BEGIN
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IF NEW.b IS NULL or NEW.c IS NULL THEN
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SET NEW.b="generated before update";
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SET NEW.c="generated before update";
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END IF;
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END |
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# Inserts
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set @a=0,@b=0,@c=0;
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insert into t1 (a) values(1);
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insert into t1 (a,b) values(2, "*2*");
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insert into t1 (a,b,c) values(3, "*3*", "**3**");
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insert into t1 (a,c) values(4, "**4**");
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select * from t1;
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a b c blob_a blob_b blob_c
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1 generated NULL 1 generated NULL
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2 *2* NULL 2 *2* NULL
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3 *3* **3** 3 *3* **3**
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4 generated **4** 4 generated **4**
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select @a,@b,@c;
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@a @b @c
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4 4 4
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select * from t1;
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a b c blob_a blob_b blob_c
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1 generated NULL 1 generated NULL
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2 *2* NULL 2 *2* NULL
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3 *3* **3** 3 *3* **3**
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4 generated **4** 4 generated **4**
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select @a,@b,@c;
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@a @b @c
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8 8 8
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select a,b,c from t1;
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a b c
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1 generated NULL
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2 *2* NULL
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3 *3* **3**
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4 generated **4**
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select @a,@b,@c;
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@a @b @c
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8 8 8
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select a,b,c,blob_a from t1;
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a b c blob_a
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1 generated NULL 1
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2 *2* NULL 2
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3 *3* **3** 3
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4 generated **4** 4
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select @a,@b,@c;
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@a @b @c
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12 8 8
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# updates
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set @a=0,@b=0,@c=0;
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update t1 set a=a+100 where a=1;
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update t1 set a=a+100, b="*102*" where a=2;
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update t1 set a=a+100, b=NULL where a=3;
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update t1 set a=a+100, b="invisible", c=NULL where a=4;
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select @a,@b,@c;
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@a @b @c
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0 0 0
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select * from t1;
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a b c blob_a blob_b blob_c
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101 generated generated before update 101 generated generated before update
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102 generated generated before update 102 generated generated before update
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103 generated generated before update 103 generated generated before update
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104 generated generated before update 104 generated generated before update
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drop trigger t1_ins;
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drop trigger t1_update;
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drop table t1;
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SET sql_mode = DEFAULT;
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#
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# Same test, but with virtual keys
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#
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SET sql_mode = 'NO_ENGINE_SUBSTITUTION';
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CREATE TABLE t1 (
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a INTEGER UNSIGNED NULL DEFAULT NULL,
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b CHAR(10) NULL DEFAULT NULL,
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c blob NULL DEFAULT NULL,
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blob_a blob GENERATED ALWAYS AS (a) VIRTUAL,
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blob_b blob GENERATED ALWAYS AS (RTRIM(b)) VIRTUAL,
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blob_c blob GENERATED ALWAYS AS (c) VIRTUAL,
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key (a),
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key (blob_a(10)),
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key (blob_b(10)),
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key (blob_c(10))
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);
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CREATE TRIGGER t1_ins
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BEFORE INSERT
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ON t1
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FOR EACH ROW
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BEGIN
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IF NEW.b IS NULL THEN
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SET NEW.b="generated before insert";
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END IF;
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END |
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CREATE TRIGGER t1_update
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BEFORE UPDATE
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ON t1
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FOR EACH ROW
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BEGIN
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IF NEW.b IS NULL or NEW.c IS NULL THEN
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SET NEW.b="generated before update";
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SET NEW.c="generated before update";
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END IF;
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END |
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# Inserts
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insert into t1 (a) values(1);
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insert into t1 (a,b) values(2, "*2*");
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insert into t1 (a,b,c) values(3, "*3*", "**3**");
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insert into t1 (a,c) values(4, "**4**");
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select * from t1;
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a b c blob_a blob_b blob_c
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1 generated NULL 1 generated NULL
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2 *2* NULL 2 *2* NULL
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3 *3* **3** 3 *3* **3**
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4 generated **4** 4 generated **4**
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select @a,@b,@c;
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@a @b @c
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4 4 4
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select * from t1;
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a b c blob_a blob_b blob_c
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1 generated NULL 1 generated NULL
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2 *2* NULL 2 *2* NULL
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3 *3* **3** 3 *3* **3**
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4 generated **4** 4 generated **4**
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select @a,@b,@c;
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@a @b @c
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4 4 4
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select a,b,c from t1;
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a b c
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1 generated NULL
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2 *2* NULL
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3 *3* **3**
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4 generated **4**
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select @a,@b,@c;
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@a @b @c
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4 4 4
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select a,b,c,blob_a from t1;
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a b c blob_a
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1 generated NULL 1
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2 *2* NULL 2
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3 *3* **3** 3
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4 generated **4** 4
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select @a,@b,@c;
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@a @b @c
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4 4 4
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# updates
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update t1 set a=a+100 where a=1;
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update t1 set a=a+100, b="*102*" where a=2;
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update t1 set a=a+100, b=NULL where a=3;
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update t1 set a=a+100, b="invisible", c=NULL where a=4;
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select * from t1;
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a b c blob_a blob_b blob_c
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101 generated generated before update 101 generated generated before update
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102 generated generated before update 102 generated generated before update
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103 generated generated before update 103 generated generated before update
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104 generated generated before update 104 generated generated before update
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drop trigger t1_ins;
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drop trigger t1_update;
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drop table t1;
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SET sql_mode = DEFAULT;
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