default-constraint

What does the Alter Table syntax look like for adding a DATETIME column?

由 强颜欢笑 提交于 2020-08-22 07:40:49
问题 I can't find what the syntax looks like for adding a DATETIME column to a mysql table when I want to set the default to - example - 2011-01-26 14:30:00 Does anyone know what that syntax looks like? Here's what I've got ADD COLUMN new_date DATETIME AFTER preceding_col, Thanks 回答1: If you ever have doubts, the syntax is explained here http://dev.mysql.com/doc/refman/5.5/en/alter-table.html ALTER TABLE yourTable ADD COLUMN new_date DATETIME NOT NULL DEFAULT 20110126143000 AFTER preceding_col or

How to override SQL Server default value constraint on a boolean when inserting new entity? [closed]

由 和自甴很熟 提交于 2019-12-25 17:05:45
问题 Closed . This question needs details or clarity. It is not currently accepting answers. Want to improve this question? Add details and clarify the problem by editing this post. Closed 3 years ago . This project is using Entity Framework code-first. I have an entity called Department with a boolean value that specifies whether it is an active department. Here is a simplified version of the entity definition. There are also no fluent mappings for the Active property. public class Department {

How to get EF 6 to handle DEFAULT CONSTRAINT on a database during INSERT

由 天涯浪子 提交于 2019-12-22 01:25:57
问题 I am new to EF (its my first week), but not new to databases or to programming. Others have asked similar questions, but I don't feel that it has been asked with the right detail or explained quite as it needs to be explained, so here I go. Question: How do I get Entity Framework to properly deal with columns in a database that have a DEFAULT CONSTRAINT defined when performing an INSERT? Meaning, if I do not supply a value in my model during an insert operation, how do I get EF to exclude

How to get EF 6 to handle DEFAULT CONSTRAINT on a database during INSERT

由 我的梦境 提交于 2019-12-04 23:59:53
I am new to EF (its my first week), but not new to databases or to programming. Others have asked similar questions, but I don't feel that it has been asked with the right detail or explained quite as it needs to be explained, so here I go. Question: How do I get Entity Framework to properly deal with columns in a database that have a DEFAULT CONSTRAINT defined when performing an INSERT? Meaning, if I do not supply a value in my model during an insert operation, how do I get EF to exclude that column from its generated TSQL INSERT command, so that the database-defined DEFAULT CONSTRAINT will

SqlBulkCopy into table that Default column values fails when source DataTable row has DBNull.Value

由 假如想象 提交于 2019-11-29 07:21:54
Update: Here is my solution I have a table defined as: CREATE TABLE [dbo].[csvrf_References] ( [Ident] [int] IDENTITY(1,1) NOT NULL, [ReferenceID] [uniqueidentifier] NOT NULL DEFAULT (newsequentialid()), [Type] [nvarchar](255) NOT NULL, [Location] [nvarchar](1000) NULL, [Description] [nvarchar](2000) NULL, [CreatedOn] [datetime] NOT NULL DEFAULT (getdate()), [LastUpdatedOn] [datetime] NOT NULL DEFAULT (getdate()), [LastUpdatedUser] [nvarchar](100) NOT NULL DEFAULT (suser_sname()), CONSTRAINT [PK_References] PRIMARY KEY NONCLUSTERED ([ReferenceID] ASC) ) ON [PRIMARY] I have a DataTable with

Command for adding a default constraint

由 眉间皱痕 提交于 2019-11-28 22:12:09
There appears to be at least two ways to add a default constraint using straight T-SQL. Am I correct that the only difference between the two below is that the second method specifically creates a name for the constraint, and the first method has one generated by SQL Server? ALTER TABLE [Common].[PropertySetting] ADD DEFAULT ((1)) FOR [Active]; ALTER TABLE [Common].[PropertySetting] ADD CONSTRAINT [DF_PropertySetting_Active) DEFAULT ((1)) FOR [Active]; gbn Pretty much, yes for an ALTER TABLE You can add a columnn with default in one step for CREATE or ALTER too. ALTER TABLE foo ADD bar varchar

default a column with empty string

由 时光总嘲笑我的痴心妄想 提交于 2019-11-28 10:39:51
Is there a way, via a SQL statement, to ensure a column's default value is an empty string '' instead of NULL ? Yes - use a DEFAULT constraint: DROP TABLE IF EXISTS `example`.`test`; CREATE TABLE `example`.`test` ( `string_test` varchar(45) NOT NULL DEFAULT '' ) ENGINE=InnoDB DEFAULT CHARSET=latin1; 来源： https://stackoverflow.com/questions/3357953/default-a-column-with-empty-string

SqlBulkCopy into table that Default column values fails when source DataTable row has DBNull.Value

由 独自空忆成欢 提交于 2019-11-28 00:55:00
问题 Update: Here is my solution I have a table defined as: CREATE TABLE [dbo].[csvrf_References] ( [Ident] [int] IDENTITY(1,1) NOT NULL, [ReferenceID] [uniqueidentifier] NOT NULL DEFAULT (newsequentialid()), [Type] [nvarchar](255) NOT NULL, [Location] [nvarchar](1000) NULL, [Description] [nvarchar](2000) NULL, [CreatedOn] [datetime] NOT NULL DEFAULT (getdate()), [LastUpdatedOn] [datetime] NOT NULL DEFAULT (getdate()), [LastUpdatedUser] [nvarchar](100) NOT NULL DEFAULT (suser_sname()), CONSTRAINT

Command for adding a default constraint

由 孤街醉人 提交于 2019-11-27 14:28:17
问题 There appears to be at least two ways to add a default constraint using straight T-SQL. Am I correct that the only difference between the two below is that the second method specifically creates a name for the constraint, and the first method has one generated by SQL Server? ALTER TABLE [Common].[PropertySetting] ADD DEFAULT ((1)) FOR [Active]; ALTER TABLE [Common].[PropertySetting] ADD CONSTRAINT [DF_PropertySetting_Active) DEFAULT ((1)) FOR [Active]; 回答1: Pretty much, yes for an ALTER TABLE

default a column with empty string

由 别来无恙 提交于 2019-11-27 03:43:16
问题 Is there a way, via a SQL statement, to ensure a column's default value is an empty string '' instead of NULL ? 回答1: Yes - use a DEFAULT constraint: DROP TABLE IF EXISTS `example`.`test`; CREATE TABLE `example`.`test` ( `string_test` varchar(45) NOT NULL DEFAULT '' ) ENGINE=InnoDB DEFAULT CHARSET=latin1; 来源： https://stackoverflow.com/questions/3357953/default-a-column-with-empty-string
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