75 lines
1.6 KiB
Plaintext
75 lines
1.6 KiB
Plaintext
create table t1 (f1 int primary key) engine=innodb;
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create table t2 (f1 int primary key,
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constraint c1 foreign key (f1) references t1(f1)
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on update cascade
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on delete cascade) engine=innodb;
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create table t3 (f1 int primary key,
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constraint c2 foreign key (f1) references t1(f1)
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on update cascade
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on delete cascade) engine=innodb;
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show create table t1;
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Table Create Table
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t1 CREATE TABLE `t1` (
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`f1` int(11) NOT NULL,
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PRIMARY KEY (`f1`)
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) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
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show create table t2;
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Table Create Table
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t2 CREATE TABLE `t2` (
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`f1` int(11) NOT NULL,
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PRIMARY KEY (`f1`),
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CONSTRAINT `c1` FOREIGN KEY (`f1`) REFERENCES `t1` (`f1`) ON DELETE CASCADE ON UPDATE CASCADE
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) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
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show create table t3;
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Table Create Table
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t3 CREATE TABLE `t3` (
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`f1` int(11) NOT NULL,
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PRIMARY KEY (`f1`),
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CONSTRAINT `c2` FOREIGN KEY (`f1`) REFERENCES `t1` (`f1`) ON DELETE CASCADE ON UPDATE CASCADE
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) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
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insert into t1 values (1);
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insert into t1 values (2);
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insert into t1 values (3);
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insert into t2 values (1);
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insert into t2 values (2);
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insert into t2 values (3);
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insert into t3 values (1);
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insert into t3 values (2);
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insert into t3 values (3);
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select f1 from t1;
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f1
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1
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2
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3
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select f1 from t2;
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f1
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1
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2
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3
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select f1 from t3;
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f1
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1
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2
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3
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SET DEBUG='+d,dml_cascade_only_once';
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SET DEBUG='+d,row_upd_cascade_lock_wait_err';
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update t1 set f1 = 100 where f1 = 2;
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select f1 from t1;
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f1
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1
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3
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100
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select f1 from t2;
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f1
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1
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3
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100
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select f1 from t3;
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f1
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1
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3
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100
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drop table t2;
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drop table t3;
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drop table t1;
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