C#测试数据库连接是否成功
using System.Data.SqlClient;
using System.Data;
public class ConnectionTestInfo
{
private static SqlConnection mySqlConnection; //mySqlConnection is a SqlConnection object
private static string ConnectionString = "";
private static bool IsCanConnectioned = false;
/// <summary>
/// 测试连接数据库是否成功
/// </summary>
/// <returns></returns>
public static bool ConnectionTest()
{
//获取数据库连接字符串
ConnectionString = ConnectionInfo.ConnectionString();
//创建连接对象
mySqlConnection = new SqlConnection(ConnectionString);
//ConnectionTimeout 在.net 1.x 可以设置 在.net 2.0后是只读属性,则需要在连接字符串设置
//如:server=.;uid=sa;pwd=;database=PMIS;Integrated Security=SSPI; Connection Timeout=30
//mySqlConnection.ConnectionTimeout = 1;//设置连接超时的时间
try
{
//Open DataBase
//打开数据库
mySqlConnection.Open();
IsCanConnectioned = true;
}
catch
{
//Can not Open DataBase
//打开不成功 则连接不成功
IsCanConnectioned = false;
}
finally
{
//Close DataBase
//关闭数据库连接
mySqlConnection.Close();
}
//mySqlConnection is a SqlConnection object
if (mySqlConnection.State == ConnectionState.Closed || mySqlConnection.State == ConnectionState.Broken)
{
//Connection is not available
return IsCanConnectioned;
}
else
{
//Connection is available
return IsCanConnectioned;
}
}
}
其中数据库字符串调用了类ConnectionInfo的方法ConnectionString
public class ConnectionInfo
{
public ConnectionInfo() { }
/// <summary>
/// 从配置文件中读取数据库联接字符串
/// </summary>
/// <returns></returns>
public static string ConnectionString()
{
return (ConfigurationSettings.AppSettings["ConnectionString"]);
}
}
解决ASP.NET Web Applicatio超时时间已到.在操作完成之前超时时间已过或服务器未响应
“超时时间已到。在操作完成之前超时时间已过或服务器未响应”
初步分析原因为对MSSQL操作时连接超时,知道这事,以前没留意,大概是在配置文件中设置连接时限,在网上找了下解决方法,大多说在数据库连接字符串里解决
SqlConnection con = new SqlConnection("server=.;database=myDB;uid=sa;pwd=password;")改为:
SqlConnection con = new SqlConnection("server=.;database=myDB;uid=sa;pwd=password;Connect Timeout=500")似乎没效果。依然运行30秒即报超时!
突然感觉似乎应该可以在连接数据库代码中指明,式了下con的属性,有个ConnectionTimeout,
SqlConnection con = new SqlConnection("server=.;database=myDB;uid=sa;pwd=;");
con.ConnectionTimeout = 180;//报错,属性ConnectionTimeout 为只读!尝试失败,再接着看command对象属性,发现其也有类似属性!CommandTimeout设置一下:
SqlCommand cmd = new SqlCommand();
cmd.CommandTimeout = 180;再运行,即解决,这里设置的时间的180秒,即三分钟!可根据需要设置,如果过长,也可以设置为0,当此属性设置为0时表示不限制时间。此属性值应该慎用。还需要在Web.config配置文件中设置http请求运行时限间
<system.web>
<httpRuntime maxRequestLength="102400" executionTimeout="720" />
</system.web>