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("===\n"); String sql ="SELECT name, collation_name FROM sys.databases";using(SqlCommand command =newSqlCommand(sql, connection)) { connection.Open();using(SqlDataReader reader = command.ExecuteReader()) {while(reader.Read()) { Console.WriteLine("{0} {1}", reader.GetString(0), read...
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“We use MongoDB as the core database for our services, so any new innovative idea or new service we build, we automatically say, ‘We’re going to use MongoDB as the core platform,’ knowing that it’s going to give us the reliability and the scalability that we’re going to need...
vs2019里面没有MySQL Database为什么 总体介绍 只想用 ADO.NET 搭建多层框架,动软代码生成器是一个不错的选择。 T4 (Text Template Transformation Toolkit) 是微软官方在 VisualStudio 2008+ 中开始使用的代码生成引擎。在 Visual Studio 中,“T4 文本模板”是由一些文本块和控制逻辑组成的混合模板,它可以生成文本...
SHOW DATABASES;查询所有数据库 use 数据库名;使用某数据库 SHOW TABLES查询所有表 SHOW COLUMNS FROM 表名查询该表所有列 SELECT 列 FROM 表名查询 SELECT 列1,列2... FROM 表名多列查询 SELECT * FROM 表名全部查询(查询所有列) DISTINCT# DISTINCT关键词用于返回唯一不同的值。
("===\n"); String sql = "SELECT name, collation_name FROM sys.databases"; using (SqlCommand command = new SqlCommand(sql, connection)) { connection.Open(); using (SqlDataReader reader = command.ExecuteReader()) { while (reader.Read()) { Console.WriteLine("{0} {1}", reader.GetStrin...
Written By Posted single database vs multiple databases Radhakant Samal February 24, 2011 11:10PM Re: single database vs multiple databases Rick James March 01, 2011 10:13PM Sorry, you can't reply to this topic. It has been closed....
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Databases usually trade space for speeding and allocating huge amounts of disk space ahead of time, to avoid allocation at transaction time. Space freed by delete may be reused or not due to speed reasons.Hope it can help.Regards, Sofiya Li...