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ea1b25046c
When updating a table with virtual BLOB columns, the following might happen: - an old record is read from the table, it has no virtual blob values - update_virtual_fields() is run, vcol blob gets its value into the record. But only a pointer to the value is in the table->record[0], the value is in Field_blob::value String (but it doesn't have to be! it can be in the record, if the column is just a copy of another columns: ... b VARCHAR, c BLOB AS (b) ...) - store_record(table,record[1]), old record now is in record[1] - fill_record() prepares new values in record[0], vcol blob is updated, new value replaces the old one in the Field_blob::value - now both record[1] and record[0] have a pointer that points to the *new* vcol blob value. Or record[1] has a pointer to nowhere if Field_blob::value had to realloc. To fix this I have introduced a new String object 'read_value' in Field_blob. When updating virtual columns when a row has been read, the allocated value is stored in 'read_value' instead of 'value'. The allocated blobs for the new row is stored in 'value' as before. I also made, as a safety precaution, the insert delayed handling of blobs more general by using value to store strings instead of the record. This ensures that virtual functions on delayed insert should work in as in the case of normal insert. Triggers are now properly updating the read, write and vcol maps for used fields. This means that we don't need VCOL_UPDATE_FOR_READ_WRITE anymore and there is no need for any other special handling of triggers in update_virtual_fields(). To be able to test how many times virtual fields are invoked, I also relaxed rules that one can use local (@) variables in DEFAULT and non persistent virtual field expressions.
283 lines
6.1 KiB
PHP
283 lines
6.1 KiB
PHP
################################################################################
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# inc/vcol_trigger_sp.inc #
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# #
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# Purpose: #
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# Testing triggers, stored procedures and functions #
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# defined on tables with virtual columns. #
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# #
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# #
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# #
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#------------------------------------------------------------------------------#
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# Original Author: Andrey Zhakov #
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# Original Date: 2008-09-04 #
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# Change Author: Oleksandr Byelkin (Monty program Ab)
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# Date: 2009-03-24
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# Change: Syntax changed
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################################################################################
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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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delimiter |;
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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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delimiter ;|
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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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select * from t2;
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insert into t1 (a) values (10);
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select * from t1;
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select * from t2;
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insert into t1 (a) values (600);
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select * from t1;
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--replace_column 1 <timestamp>
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select * from t2;
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select f1();
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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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delimiter |;
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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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delimiter ;|
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delete from t1;
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call p1();
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select * from t2;
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select * from t1;
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drop table t1,t2;
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drop procedure p1;
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--echo #
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--echo # Bug mdev-3845: values of virtual columns are not computed for triggers
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--echo #
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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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DELIMITER |;
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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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DELIMITER ;|
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INSERT INTO t1 (a) VALUES (1), (2), (3);
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SELECT * FROM t2;
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DELETE FROM t1;
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SELECT * FROM t2;
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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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--echo #
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--echo # Examine the number of times triggers are recalculated for updates
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--echo #
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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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DELIMITER |;
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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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DELIMITER ;|
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--echo # 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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select @a,@b,@c;
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select * from t1;
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select @a,@b,@c;
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select a,b,c from t1;
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select @a,@b,@c;
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select a,b,c,blob_a from t1;
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select @a,@b,@c;
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--echo # 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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select * from t1;
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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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--echo #
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--echo # Same test, but with virtual keys
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--echo #
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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 (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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DELIMITER |;
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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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DELIMITER ;|
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--echo # 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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select @a,@b,@c;
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select * from t1;
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select @a,@b,@c;
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select a,b,c from t1;
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select @a,@b,@c;
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select a,b,c,blob_a from t1;
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select @a,@b,@c;
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--echo # 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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drop trigger t1_ins;
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drop trigger t1_update;
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drop table t1;
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