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5becb110e0
mysqldump / SHOW CREATE TABLE will show the NEXT available value for the PK, rather than the *first* one that was available (that named in the original CREATE TABLE ... AUTO_INCREMENT = ... statement). This should produce correct and robust behaviour for the obvious use cases -- when no data were inserted, then we'll produce a statement featuring the same value the original CREATE TABLE had; if we dump with values, INSERTing the values on the target machine should set the correct next_ID anyway (and if not, we'll still have our AUTO_INCREMENT = ... to do that). Lastly, just the CREATE statement (with no data) for a table that saw inserts would still result in a table that new values could safely be inserted to). There seems to be no robust way however to see whether the next_ID field is > 1 because it was set to something else with CREATE TABLE ... AUTO_INCREMENT = ..., or because there is an AUTO_INCREMENT column in the table (but no initial value was set with AUTO_INCREMENT = ...) and then one or more rows were INSERTed, counting up next_ID. This means that in both cases, we'll generate an AUTO_INCREMENT = ... clause in SHOW CREATE TABLE / mysqldump. As we also show info on, say, charsets even if the user did not explicitly give that info in their own CREATE TABLE, this shouldn't be an issue. As per above, the next_ID will be affected by any INSERTs that have taken place, though. This /should/ result in correct and robust behaviour, but it may look non-intuitive to some users if they CREATE TABLE ... AUTO_INCREMENT = 1000 and later (after some INSERTs) have SHOW CREATE TABLE give them a different value (say, CREATE TABLE ... AUTO_INCREMENT = 1006), so the docs should possibly feature a caveat to that effect. It's not very intuitive the way it works now (with the fix), but it's *correct*. We're not storing the original value anyway, if we wanted that, we'd have to change on-disk representation? If we do dump/load cycles with empty DBs, nothing will change. This changeset includes an additional test case that proves that tables with rows will create the same next_ID for AUTO_INCREMENT = ... across dump/restore cycles. Confirmed by support as likely solution for client's problem.
381 lines
7.9 KiB
Text
381 lines
7.9 KiB
Text
drop table if exists t1;
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drop table if exists t2;
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SET SQL_WARNINGS=1;
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create table t1 (a int not null auto_increment,b int, primary key (a)) engine=myisam auto_increment=3;
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insert into t1 values (1,1),(NULL,3),(NULL,4);
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delete from t1 where a=4;
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insert into t1 values (NULL,5),(NULL,6);
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select * from t1;
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a b
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1 1
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3 3
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5 5
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6 6
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delete from t1 where a=6;
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replace t1 values (3,1);
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ALTER TABLE t1 add c int;
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replace t1 values (3,3,3);
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insert into t1 values (NULL,7,7);
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update t1 set a=8,b=b+1,c=c+1 where a=7;
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insert into t1 values (NULL,9,9);
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select * from t1;
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a b c
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1 1 NULL
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3 3 3
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5 5 NULL
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8 8 8
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9 9 9
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drop table t1;
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create table t1 (
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skey tinyint unsigned NOT NULL auto_increment PRIMARY KEY,
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sval char(20)
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);
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insert into t1 values (NULL, "hello");
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insert into t1 values (NULL, "hey");
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select * from t1;
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skey sval
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1 hello
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2 hey
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select _rowid,t1._rowid,skey,sval from t1;
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_rowid _rowid skey sval
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1 1 1 hello
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2 2 2 hey
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drop table t1;
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create table t1 (a char(10) not null, b int not null auto_increment, primary key(a,b));
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insert into t1 values ("a",1),("b",2),("a",2),("c",1);
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insert into t1 values ("a",NULL),("b",NULL),("c",NULL),("e",NULL);
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insert into t1 (a) values ("a"),("b"),("c"),("d");
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insert into t1 (a) values ('k'),('d');
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insert into t1 (a) values ("a");
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insert into t1 values ("d",last_insert_id());
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select * from t1;
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a b
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a 1
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a 2
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a 3
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a 4
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a 5
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b 2
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b 3
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b 4
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c 1
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c 2
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c 3
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d 1
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d 2
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d 5
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e 1
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k 1
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drop table t1;
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create table t1 (ordid int(8) not null auto_increment, ord varchar(50) not null, primary key (ordid), index(ord,ordid));
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insert into t1 (ordid,ord) values (NULL,'sdj'),(NULL,'sdj');
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select * from t1;
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ordid ord
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1 sdj
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2 sdj
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drop table t1;
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create table t1 (ordid int(8) not null auto_increment, ord varchar(50) not null, primary key (ord,ordid));
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insert into t1 values (NULL,'sdj'),(NULL,'sdj'),(NULL,"abc"),(NULL,'abc'),(NULL,'zzz'),(NULL,'sdj'),(NULL,'abc');
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select * from t1;
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ordid ord
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1 abc
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2 abc
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3 abc
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1 sdj
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2 sdj
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3 sdj
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1 zzz
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drop table t1;
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create table t1 (sid char(5), id int(2) NOT NULL auto_increment, key(sid, id));
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create table t2 (sid char(20), id int(2));
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insert into t2 values ('skr',NULL),('skr',NULL),('test',NULL);
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insert into t1 select * from t2;
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select * from t1;
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sid id
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skr 1
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skr 2
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test 1
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drop table t1,t2;
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create table t1 (a int not null primary key auto_increment);
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insert into t1 values (0);
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update t1 set a=0;
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select * from t1;
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a
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0
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check table t1;
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Table Op Msg_type Msg_text
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test.t1 check warning Found row where the auto_increment column has the value 0
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test.t1 check status OK
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drop table t1;
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create table t1 (a int not null auto_increment primary key);
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insert into t1 values (NULL);
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insert into t1 values (-1);
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select last_insert_id();
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last_insert_id()
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1
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insert into t1 values (NULL);
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select * from t1;
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a
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-1
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1
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2
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drop table t1;
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create table t1 (a int not null auto_increment primary key) /*!40102 engine=heap */;
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insert into t1 values (NULL);
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insert into t1 values (-1);
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select last_insert_id();
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last_insert_id()
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1
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insert into t1 values (NULL);
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select * from t1;
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a
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1
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-1
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2
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drop table t1;
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create table t1 (i tinyint unsigned not null auto_increment primary key);
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insert into t1 set i = 254;
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insert into t1 set i = null;
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select last_insert_id();
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last_insert_id()
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255
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explain extended select last_insert_id();
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE NULL NULL NULL NULL NULL NULL NULL No tables used
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Warnings:
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Note 1003 select sql_no_cache last_insert_id() AS `last_insert_id()`
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insert into t1 set i = 254;
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ERROR 23000: Duplicate entry '254' for key 1
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select last_insert_id();
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last_insert_id()
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255
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insert into t1 set i = null;
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ERROR 23000: Duplicate entry '255' for key 1
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select last_insert_id();
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last_insert_id()
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0
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drop table t1;
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create table t1 (i tinyint unsigned not null auto_increment, key (i));
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insert into t1 set i = 254;
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insert into t1 set i = null;
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select last_insert_id();
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last_insert_id()
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255
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insert into t1 set i = null;
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Warnings:
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Warning 1264 Data truncated; out of range for column 'i' at row 1
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select last_insert_id();
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last_insert_id()
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255
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drop table t1;
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create table t1 (i tinyint unsigned not null auto_increment primary key, b int, unique (b));
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insert into t1 values (NULL, 10);
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select last_insert_id();
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last_insert_id()
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1
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insert into t1 values (NULL, 15);
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select last_insert_id();
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last_insert_id()
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2
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insert into t1 values (NULL, 10);
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ERROR 23000: Duplicate entry '10' for key 2
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select last_insert_id();
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last_insert_id()
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0
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drop table t1;
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create table t1(a int auto_increment,b int null,primary key(a));
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SET SQL_MODE=NO_AUTO_VALUE_ON_ZERO;
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insert into t1(a,b)values(NULL,1);
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insert into t1(a,b)values(200,2);
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insert into t1(a,b)values(0,3);
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insert into t1(b)values(4);
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insert into t1(b)values(5);
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insert into t1(b)values(6);
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insert into t1(b)values(7);
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select * from t1 order by b;
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a b
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1 1
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200 2
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0 3
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201 4
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202 5
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203 6
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204 7
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alter table t1 modify b mediumint;
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select * from t1 order by b;
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a b
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1 1
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200 2
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0 3
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201 4
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202 5
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203 6
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204 7
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create table t2 (a int);
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insert t2 values (1),(2);
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alter table t2 add b int auto_increment primary key;
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select * from t2;
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a b
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1 1
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2 2
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drop table t2;
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delete from t1 where a=0;
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update t1 set a=0 where b=5;
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select * from t1 order by b;
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a b
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1 1
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200 2
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201 4
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0 5
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203 6
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204 7
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delete from t1 where a=0;
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update t1 set a=NULL where b=6;
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Warnings:
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Warning 1263 Data truncated; NULL supplied to NOT NULL column 'a' at row 4
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update t1 set a=300 where b=7;
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SET SQL_MODE='';
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insert into t1(a,b)values(NULL,8);
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insert into t1(a,b)values(400,9);
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insert into t1(a,b)values(0,10);
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insert into t1(b)values(11);
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insert into t1(b)values(12);
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insert into t1(b)values(13);
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insert into t1(b)values(14);
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select * from t1 order by b;
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a b
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1 1
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200 2
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201 4
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0 6
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300 7
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301 8
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400 9
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401 10
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402 11
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403 12
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404 13
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405 14
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delete from t1 where a=0;
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update t1 set a=0 where b=12;
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select * from t1 order by b;
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a b
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1 1
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200 2
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201 4
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300 7
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301 8
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400 9
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401 10
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402 11
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0 12
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404 13
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405 14
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delete from t1 where a=0;
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update t1 set a=NULL where b=13;
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Warnings:
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Warning 1263 Data truncated; NULL supplied to NOT NULL column 'a' at row 9
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update t1 set a=500 where b=14;
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select * from t1 order by b;
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a b
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1 1
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200 2
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201 4
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300 7
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301 8
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400 9
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401 10
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402 11
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0 13
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500 14
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drop table t1;
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create table t1 (a bigint);
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insert into t1 values (1), (2), (3), (NULL), (NULL);
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alter table t1 modify a bigint not null auto_increment primary key;
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select * from t1;
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a
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1
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2
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3
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4
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5
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drop table t1;
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create table t1 (a bigint);
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insert into t1 values (1), (2), (3), (0), (0);
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alter table t1 modify a bigint not null auto_increment primary key;
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select * from t1;
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a
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1
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2
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3
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4
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5
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drop table t1;
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create table t1 (a bigint);
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insert into t1 values (0), (1), (2), (3);
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set sql_mode=NO_AUTO_VALUE_ON_ZERO;
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alter table t1 modify a bigint not null auto_increment primary key;
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set sql_mode= '';
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select * from t1;
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a
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0
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1
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2
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3
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drop table t1;
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create table t1 (a int auto_increment primary key , b int null);
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set sql_mode=NO_AUTO_VALUE_ON_ZERO;
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insert into t1 values (0,1),(1,2),(2,3);
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select * from t1;
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a b
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0 1
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1 2
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2 3
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set sql_mode= '';
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alter table t1 modify b varchar(255);
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insert into t1 values (0,4);
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select * from t1;
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a b
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0 1
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1 2
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2 3
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3 4
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drop table t1;
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CREATE TABLE t1 ( a INT AUTO_INCREMENT, b BLOB, PRIMARY KEY (a,b(10)));
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INSERT INTO t1 (b) VALUES ('aaaa');
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CHECK TABLE t1;
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Table Op Msg_type Msg_text
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test.t1 check status OK
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INSERT INTO t1 (b) VALUES ('');
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CHECK TABLE t1;
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Table Op Msg_type Msg_text
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test.t1 check status OK
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INSERT INTO t1 (b) VALUES ('bbbb');
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CHECK TABLE t1;
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Table Op Msg_type Msg_text
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test.t1 check status OK
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DROP TABLE IF EXISTS t1;
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CREATE TABLE `t1` (
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t1_name VARCHAR(255) DEFAULT NULL,
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t1_id INT(10) UNSIGNED NOT NULL AUTO_INCREMENT,
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KEY (t1_name),
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PRIMARY KEY (t1_id)
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) AUTO_INCREMENT = 1000;
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INSERT INTO t1 (t1_name) VALUES('MySQL');
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INSERT INTO t1 (t1_name) VALUES('MySQL');
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INSERT INTO t1 (t1_name) VALUES('MySQL');
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SELECT * from t1;
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t1_name t1_id
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MySQL 1000
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MySQL 1001
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MySQL 1002
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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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`t1_name` varchar(255) default NULL,
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`t1_id` int(10) unsigned NOT NULL auto_increment,
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PRIMARY KEY (`t1_id`),
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KEY `t1_name` (`t1_name`)
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) ENGINE=MyISAM AUTO_INCREMENT=1003 DEFAULT CHARSET=latin1
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DROP TABLE `t1`;
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End of 4.1 tests
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