mysql> select * from setenum where settype=b'10011'; Empty set mysql> select * from setenum where enumtype=b'100'; Empty set 1. 2. 3. 4. 5. 6. 7. 8. SELECT * FROM setenum WHERE settype LIKE '%赵%'; 1. –与FIND_IN_SET函数同 SELECT * FROM setenum WHERE FIND_IN_SET('...
mysql> create table test (name varchar(40), sex enum('male', concat('fem', 'ale') ); ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'concat('fem', 'ale') )' at line 1...
mysql>INSERTINTOt(numbers)VALUES(2),('2'),('3');mysql>SELECT*FROMt;+---+|numbers|+---+|1||2||2|+---+ To determine all possible values for anENUMcolumn, useSHOW COLUMNS FROMtbl_nameLIKE 'enum_col'and parse theENUMdefinition in theTypecolumn of the output. In the C API,ENUM...
Specifies MySQL specific data type of a field, property, for use in a MySqlParameter.Namespace: MySql.Data.MySqlClientAssembly: MySql.Data.dllVersion: 9.2.0Syntaxpublic enum MySqlDbType Fields NameDescription Binary Fixed length binary string. Bit Bit-field data type Blob A binary column with ...
1 row in set (0.00 sec) 测试第二个枚举类型字段Work_City是否允许存储NULL值: root@localhost : test 11:22:53> INSERT INTO mysqlops_enum(ID,Job_type,Work_City) VALUES(3,‘Other’,NULL); ERROR 1048 (23000): Column ‘Work_City’ cannot be null ...
Status:OpenImpact on me: None Category:MySQL Server: DDLSeverity:S4 (Feature request) Version:5.6.12OS:Any Assigned to:CPU Architecture:Any Tags:enum,LIST Partition,partition [15 Aug 2013 2:38] Chao Yang Description:It would be great to have LIST partition supporting ENUM data type since it...
1 row in set (0.00 sec) mysql> update userinfo set type=30; Query OK, 115598 rows affected (2.70 sec) Rows matched: 115598 Changed: 115598 Warnings: 0 mysql> select concat(round(sum(data_length/1024/1024),3),'MB') as data_size, ...
如果看到标题就能表示赞同的小伙伴,那估摸你也肯定看过Joshua Bloch大神说过的这么一句话:单元素的枚举类型已经成为实现Singleton的最佳方法。我把它翻译成人话就是:实现单例模式的最佳方法是使用枚举。 单例模式 单例模式(Singleton Pattern):确保一个类有且只有一个实例,并提供一个全局访问点。
问DBAL，diff命令和enum类型EN我通过创建自己的diff来解决这个问题，它首先使用以下方法添加'enum‘类型(...
mysql> show create table test_tab; +--+--+ | Table | Create Table | +--+--+ | test_tab | CREATE TABLE `test_tab` ( `enum_txt` enum('Text-1','Text-2','日本語') character set ujis default NULL ) ENGINE=InnoDB DEFAULT CHARSET=utf8 | +--+--+ 1 row in set Thanks a ...