tinyint

TINYINT vs ENUM(0, 1) for boolean values in MySQL

由 江枫思渺然 提交于 2019-12-31 11:31:11
问题 Which one is better, Tinyint with 0 and 1 values or ENUM 0,1 in MyISAM tables and MySQL 5.1? 回答1: You can use BIT(1) as mentioned in mysql 5.1 reference. i will not recommend enum or tinyint(1) as bit(1) needs only 1 bit for storing boolean value while tinyint(1) needs 8 bits. 回答2: My research shows that BIT(1) is a synonym for TINYINT(1) for versions of MySQL before 5.0.3. MySQL versions after 5.0.3 change how the BIT datatype works. It is no longer a synonym for TINYINT and is the only data

asp.net mvc linq sql problem

由 一曲冷凌霜 提交于 2019-12-12 15:17:46
问题 I am working on a project using asp.net mvc 2 and linq to sql. The problem occurs when trying to insert data into a table where the table has an identity column type of tinyint. When trying to insert the following error occurs: The primary key column of type 'TinyInt' cannot be generated by the server. Does linq to sql support tinyint datatype? Please help me 回答1: From what I have been able to gather, Linq To Sql doesn't support TinyInt for auto increment fields. Can you change the datatype

Ado Entity: Treat Tiny as Boolean = false

由 只谈情不闲聊 提交于 2019-12-11 11:01:52
问题 I need to connect a .net application to a mysql database. When I add the tables to the model, all the columns with the type Tinyint are mapped like boolean. After Searching in mysql forum, i add "Treat Tiny As Boolean=false" in the connection string. When I refresh the model, nothing changes. If I change the type manually to Sbyte or Int 16 I get the following error. Error 43 Error 2019: Member Mapping specified is not valid. The type 'Edm.SByte[Nullable=True,DefaultValue=]' of member

Is there an advantage on setting tinyint fields when I know that the value will not exceed 255?

由 妖精的绣舞 提交于 2019-12-11 02:17:32
问题 Should I choose the smallest datatype possible, or if I am storing the value 1 for example, it doesn't matter what is the col datatype and the value will occupy the same memory size? The question is also, cuz I will always have to convert it and play around in the application. UPDATE I think that varchar(1) and varchar(50) is the same memory size if value is "a", I thought it's the same with int and tinyint, according to the answers I understand it's not, is it? 回答1: Always choose the

How can a javax.persistence.Column be defined as an Unsigned TINYINT?

由 五迷三道 提交于 2019-12-10 22:06:53
问题 I am creating a Java Persistence Entity Bean (with NetBeans IDE 8.0.1) based on an existing table in a MySQL database. I've come across a field in this table which is of type "Unsigned TINYINT(3)" . I have found that the following can be done to define the type of a column as an unsigned int: private long foo; @Column(columnDefinition = "UNSIGNED INT(11)") public long getFoo() { return foo; } Steps to reproduce the problem: I am trying to create a field as follows: @Size(max = 3) @Column(name

Incorrect mapping of mysql tinyint(2) as boolean with doctrine

由 隐身守侯 提交于 2019-12-07 02:51:52
问题 I reverse engineered my database with symfony2 and doctrine with commands : php app/console doctrine:mapping:convert php app/console doctrine:mapping:import php app/console doctrine:generate:entities But my field was mapped as boolean instead of tinyint(2). Why it is mapping as boolean? 回答1: tinyint (regardless of length) is mapped to type boolean in the MySQL DBAL platform. Also, consider that the entity generator is not a reliable tool: it was just meant to give you some help in getting

mysql中int、bigint、smallint 和 tinyint的区别与长度

由 旧巷老猫 提交于 2019-12-03 08:00:03
通过创建一张表，来看看 mysql 中 int bigint smallint 和 tinyint的区别与长度 1、在mysql 命令行创建如下表 CREATE TABLE `test_int_1` ( `int_id` int NOT NULL, `bigint_id` bigint DEFAULT NULL, `bigint_25` bigint(25) DEFAULT NULL, `bigint_18` bigint(18) DEFAULT NULL, `int_8` int(8) DEFAULT NULL, `int_3` int(3) DEFAULT NULL, `smallint_id` smallint DEFAULT NULL, `tinyint_id` tinyint DEFAULT NULL, PRIMARY KEY (`int_id`) ) ENGINE=InnoDB DEFAULT CHARSET=utf8 2、desc mysql> desc test_int_1; +-------------+-------------+------+-----+---------+-------+ | Field | Type | Null | Key | Default | Extra | +-------------+-------------+------+--

TINYINT vs ENUM(0, 1) for boolean values in MySQL

由 折月煮酒 提交于 2019-12-02 22:04:34
Which one is better, Tinyint with 0 and 1 values or ENUM 0,1 in MyISAM tables and MySQL 5.1? You can use BIT(1) as mentioned in mysql 5.1 reference . i will not recommend enum or tinyint(1) as bit(1) needs only 1 bit for storing boolean value while tinyint(1) needs 8 bits. BradChesney79 My research shows that BIT(1) is a synonym for TINYINT(1) for versions of MySQL before 5.0.3. MySQL versions after 5.0.3 change how the BIT datatype works. It is no longer a synonym for TINYINT and is the only data type that allows you to store anything in less than one byte. This datatype may be preferrable to

enum('yes', 'no') vs tinyint — which one to use?

由 |▌冷眼眸甩不掉的悲伤 提交于 2019-11-30 17:16:39
What's the best practice for fields that hold true/false values? Such columns can be defined as enum('yes','no') or as tinyint(1). Is one better/faster than the other? Is it better to use enum('1','0') vs. enum('yes','no') (i.e., does it write 'yes' or 'no' as a string to every row so the database storage size gets bigger)? Also, ENUM is a non-standard MySql extension. You should avoid it, especially if you can achieve the same results in a standard way. avoid enum from this reasons The bottom line is that ENUM has its place, but should be used sparingly. The model should enforce the

enum('yes', 'no') vs tinyint — which one to use?

由 送分小仙女□ 提交于 2019-11-30 00:47:17
问题 What's the best practice for fields that hold true/false values? Such columns can be defined as enum('yes','no') or as tinyint(1). Is one better/faster than the other? Is it better to use enum('1','0') vs. enum('yes','no') (i.e., does it write 'yes' or 'no' as a string to every row so the database storage size gets bigger)? 回答1: Also, ENUM is a non-standard MySql extension. You should avoid it, especially if you can achieve the same results in a standard way. 回答2: avoid enum from this reasons
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