SqlServer常用命令_sqlserver 的dbname

1.查询sqlserver当前的连接数

SELECT * FROM
[Master].[dbo].[SYSPROCESSES] WHERE [DBID] IN ( SELECT
   [DBID]
FROM
   [Master].[dbo].[SYSDATABASES]
WHERE
   NAME='DBName'
)
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DBName是需要查看的数据库，然后查询出来的行数，就是当前的连接数

2.```csharp
//数据库链接字符串
string connectionString= “Server =” + serverAdr + “;User =” + userName + “;Pwd =” + passWord + “;Database =” + dataName;
//连接数据库对象
using (SqlConnection connection = new SqlConnection(connectionString))
{
connection.Open();
//query为查询语句
using (SqlCommand command = new SqlCommand(query, connection))
{
using (SqlDataReader reader = command.ExecuteReader())
{
// 使用SqlDataReader对象读取数据
if (reader .HasRows)
{
reader .Read();
object obj = reader .GetValue(i);
}
// 关闭SqlDataReader对象
reader.Close();
}
}

// 关闭SqlConnection对象
connection.Close();
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}