"createdatabaseifnotexists"命令就是一个便捷的方法来自动检查和创建数据库。 下面将详细介绍如何使用"createdatabaseifnotexists"来创建数据库。 第一步:打开数据库管理系统 首先,需要打开数据库管理系统,这可以是任何支持SQL的软件,如MySQL、SQL Server、Oracle等。在打开的数据库管理
SELECT name FROM sys.databases WHERE name = N'TutorialDB' ) CREATE DATABASE [TutorialDB] GO USE [TutorialDB] -- Create a new table called 'Customers' in schema 'dbo' -- Drop the table if it already exists IF OBJECT_ID('dbo.Customers', 'U') IS NOT NULL DROP TABLE dbo.Customers G...
MySQL は、さまざまなCREATE ... IF NOT EXISTSステートメントが複製されるときにこれらの値を適用します。 データベースがソースにすでに存在するかどうかにかかわらず、すべてのCREATE DATABASE IF NOT EXISTSステートメントがレプリケートされます。
If data file name is not specified, SQL Server uses database_name as both the logical_file_name and as the os_file_name. The default path is obtained from the registry. The default path can be changed in the Server Properties (Database Settings Page) in Management Studio. Changing the ...
If data file name is not specified, SQL Server uses database_name as both the logical_file_name and as the os_file_name. The default path is obtained from the registry. The default path can be changed in the Server Properties (Database Settings Page) in Management Studio...
database_namecan be a maximum of 128 characters, unless a logical name is not specified for the log file. If a logical log file name is not specified, SQL Server generates thelogical_file_nameand theos_file_namefor the log by appending a suffix todatabase_name. This limitsdatabase_name...
SQL Server To check if a database exists before creating it in SQL Server: IF NOT EXISTS (SELECT * FROM sys.databases WHERE name = 'database_name') BEGIN CREATE DATABASE database_name; END; GO This will check if the database exists before creating it. PostgreSQL To check if a databa...
CREATE DATABASE failed. Some file names listed could not be created. Check related errors. (Microsoft SQL Server, Error: 1807) From:https://blogs.msdn.microsoft.com/poojakamath/2014/12/23/could-not-obtain-exclusive-lock-on-database-model-retry-the-operation-later-create-database-failed/ ...
EveryCREATE DATABASE IF NOT EXISTSstatement is replicated, whether or not the database already exists on the source. Similarly, everyCREATE TABLE IF NOT EXISTSstatement without aSELECTis replicated, whether or not the table already exists on the source. This includesCREATE TABLE IF NOT EXISTS ....
问MySQL、EF6和Database.CreateIfNotExistsEN找到了！通过阅读MySql docs这里，我做了两个更改：...