我尝试SELECT
在一张桌子上运行,MySql
但出现此错误:
Server Error in '/MyApp' Application.
Too many connections
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.
Exception Details: MySql.Data.MySqlClient.MySqlException: Too many connections
Source Error:
An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.
Stack Trace:
[MySqlException (0x80004005): Too many connections]
MySql.Data.MySqlClient.MySqlStream.ReadPacket() +517
MySql.Data.MySqlClient.NativeDriver.Open() +702
MySql.Data.MySqlClient.Driver.Open() +245
MySql.Data.MySqlClient.Driver.Create(MySqlConnectionStringBuilder settings) +297
MySql.Data.MySqlClient.MySqlPool.CreateNewPooledConnection() +18
MySql.Data.MySqlClient.MySqlPool.GetPooledConnection() +403
MySql.Data.MySqlClient.MySqlPool.TryToGetDriver() +228
MySql.Data.MySqlClient.MySqlPool.GetConnection() +106
MySql.Data.MySqlClient.MySqlConnection.Open() +1468
Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.0.30319.1
我用 .net 和 C# 在 iis 上运行它。知道如何解决这个问题吗?
这是例如我如何选择:
MySqlDataReader msdr;
MySqlConnection connect = new MySqlConnection(connectionStringMySql);
MySqlCommand cmd = new MySqlCommand();
string commandLine = "SELECT * FROM Table WHERE active=1;
commandLine = commandLine.Remove(commandLine.Length - 3);
cmd.CommandText = commandLine;
cmd.Connection = connect;
cmd.Connection.Open();
msdr = cmd.ExecuteReader();
while (msdr.Read())
{
//Read data
}
msdr.Close();
cmd.Connection.Close();
这就是我删除的方式:
MySqlConnection connect = new MySqlConnection(connectionStringMySql);
MySqlCommand cmd = new MySqlCommand();
cmd.Connection = connect;
cmd.Connection.Open();
string commandLine = @"DELETE FROM Table WHERE id=@id;";
cmd.CommandText = commandLine;
cmd.Parameters.AddWithValue("@id", slotId);
cmd.ExecuteNonQuery();
cmd.Connection.Close();
这就是我插入的方式:
MySqlConnection connect = new MySqlConnection(connectionStringMySql);
MySqlCommand cmd = new MySqlCommand();
cmd.Connection = connect;
cmd.Connection.Open();
string commandLine = @"INSERT INTO Table (id, weekday, start, end) VALUES" +
"(@ id, @weekday, @start, @end);";
cmd.CommandText = commandLine;
cmd.Parameters.AddWithValue("@ id", id);
cmd.Parameters.AddWithValue("@weekday", item.weekday);
cmd.Parameters.AddWithValue("@start", new TimeSpan(item.starthour, item.startmin, 0));
cmd.Parameters.AddWithValue("@end", new TimeSpan(item.endhour, item.endmin, 0));
cmd.ExecuteNonQuery();
long id = cmd.LastInsertedId;
cmd.Connection.Close();
return id;