Sql server sqlhelper-连接从未关闭
我一直在使用sqlhelper类,但在系统中的用户活动数量增加后,我遇到了问题。托管公司提到该站点在服务器的CPU上产生了沉重的负载。erkaner_slearning数据库中打开了大量连接,这些连接继续产生负载,因为这些连接从未关闭。下面是sqlhelper类。你对下面的代码有什么建议吗?我找不到任何地方需要在下面明确关闭任何连接Sql server sqlhelper-连接从未关闭,sql-server,database-connection,sqlhelper,Sql Server,Database Connection,Sqlhelper,我一直在使用sqlhelper类,但在系统中的用户活动数量增加后,我遇到了问题。托管公司提到该站点在服务器的CPU上产生了沉重的负载。erkaner_slearning数据库中打开了大量连接,这些连接继续产生负载,因为这些连接从未关闭。下面是sqlhelper类。你对下面的代码有什么建议吗?我找不到任何地方需要在下面明确关闭任何连接 public abstract class SqlHelper { public static readonly string ConnectionStr
public abstract class SqlHelper
{
public static readonly string ConnectionString = ConfigurationManager.ConnectionStrings["sLecturing_ConnectionString"].ConnectionString;
private static Hashtable parmCache = Hashtable.Synchronized(new Hashtable());
public static int ExecuteNonQuery(string connectionString, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters)
{
SqlCommand cmd = new SqlCommand();
using (SqlConnection conn = new SqlConnection(connectionString))
{
PrepareCommand(cmd, conn, null, cmdType, cmdText, commandParameters);
int val = cmd.ExecuteNonQuery();
cmd.Parameters.Clear();
return val;
}
}
public static int ExecuteNonQuery(SqlConnection connection, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters)
{
SqlCommand cmd = new SqlCommand();
PrepareCommand(cmd, connection, null, cmdType, cmdText, commandParameters);
int val = cmd.ExecuteNonQuery();
cmd.Parameters.Clear();
//connection.Close();
return val;
}
public static int ExecuteNonQuery(SqlTransaction trans, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters)
{
SqlCommand cmd = new SqlCommand();
PrepareCommand(cmd, trans.Connection, trans, cmdType, cmdText, commandParameters);
int val = cmd.ExecuteNonQuery();
cmd.Parameters.Clear();
//trans.Connection.Close();
return val;
}
public static SqlDataReader ExecuteReader(string connectionString, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters)
{
SqlCommand cmd = new SqlCommand();
SqlConnection conn = new SqlConnection(connectionString);
// we use a try/catch here because if the method throws an exception we want to
// close the connection throw code, because no datareader will exist, hence the
// commandBehaviour.CloseConnection will not work
try
{
PrepareCommand(cmd, conn, null, cmdType, cmdText, commandParameters);
SqlDataReader rdr = cmd.ExecuteReader(CommandBehavior.CloseConnection);
cmd.Parameters.Clear();
return rdr;
}
catch
{
conn.Close();
throw;
}
}
public static object ExecuteScalar(string connectionString, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters)
{
SqlCommand cmd = new SqlCommand();
using (SqlConnection connection = new SqlConnection(connectionString))
{
PrepareCommand(cmd, connection, null, cmdType, cmdText, commandParameters);
object val = cmd.ExecuteScalar();
cmd.Parameters.Clear();
return val;
}
}
public static object ExecuteScalar(SqlConnection connection, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters)
{
SqlCommand cmd = new SqlCommand();
PrepareCommand(cmd, connection, null, cmdType, cmdText, commandParameters);
object val = cmd.ExecuteScalar();
cmd.Parameters.Clear();
//connection.Close();
return val;
}
/// <summary>
/// add parameter array to the cache
/// </summary>
/// <param name="cacheKey">Key to the parameter cache</param>
/// <param name="cmdParms">an array of SqlParamters to be cached</param>
public static void CacheParameters(string cacheKey, params SqlParameter[] commandParameters)
{
parmCache[cacheKey] = commandParameters;
}
/// <summary>
/// Retrieve cached parameters
/// </summary>
/// <param name="cacheKey">key used to lookup parameters</param>
/// <returns>Cached SqlParamters array</returns>
public static SqlParameter[] GetCachedParameters(string cacheKey)
{
SqlParameter[] cachedParms = (SqlParameter[])parmCache[cacheKey];
if (cachedParms == null)
return null;
SqlParameter[] clonedParms = new SqlParameter[cachedParms.Length];
for (int i = 0, j = cachedParms.Length; i < j; i++)
clonedParms[i] = (SqlParameter)((ICloneable)cachedParms[i]).Clone();
return clonedParms;
}
/// <summary>
/// Prepare a command for execution
/// </summary>
/// <param name="cmd">SqlCommand object</param>
/// <param name="conn">SqlConnection object</param>
/// <param name="trans">SqlTransaction object</param>
/// <param name="cmdType">Cmd type e.g. stored procedure or text</param>
/// <param name="cmdText">Command text, e.g. Select * from Products</param>
/// <param name="cmdParms">SqlParameters to use in the command</param>
private static void PrepareCommand(SqlCommand cmd, SqlConnection conn, SqlTransaction trans, CommandType cmdType, string cmdText, SqlParameter[] cmdParms)
{
// bool mustCloseConnection = false;
if (conn.State != ConnectionState.Open)
{
conn.Open();
}
cmd.Connection = conn;
cmd.CommandText = cmdText;
if (trans != null)
cmd.Transaction = trans;
cmd.CommandType = cmdType;
if (cmdParms != null)
{
foreach (SqlParameter parm in cmdParms)
cmd.Parameters.Add(parm);
}
}
}
公共抽象类SqlHelper
{
public static readonly string ConnectionString=ConfigurationManager.ConnectionStrings[“slecuting_ConnectionString”]。ConnectionString;
私有静态哈希表parmCache=Hashtable.Synchronized(newhashtable());
公共静态int ExecuteOnQuery(字符串连接字符串、CommandType cmdType、字符串cmdText、参数SqlParameter[]commandParameters)
{
SqlCommand cmd=新的SqlCommand();
使用(SqlConnection conn=newsqlconnection(connectionString))
{
PrepareCommand(cmd、conn、null、cmdType、cmdText、commandParameters);
int val=cmd.ExecuteNonQuery();
cmd.Parameters.Clear();
返回val;
}
}
公共静态int ExecuteOnQuery(SqlConnection连接、CommandType cmdType、string cmdText、params SqlParameter[]commandParameters)
{
SqlCommand cmd=新的SqlCommand();
PrepareCommand(cmd、connection、null、cmdType、cmdText、commandParameters);
int val=cmd.ExecuteNonQuery();
cmd.Parameters.Clear();
//connection.Close();
返回val;
}
公共静态int ExecuteOnQuery(SqlTransaction trans、CommandType cmdType、string cmdText、params SqlParameter[]commandParameters)
{
SqlCommand cmd=新的SqlCommand();
PrepareCommand(cmd、trans.Connection、trans、cmdType、cmdText、commandParameters);
int val=cmd.ExecuteNonQuery();
cmd.Parameters.Clear();
//trans.Connection.Close();
返回val;
}
公共静态SqlDataReader ExecuteReader(字符串连接字符串、CommandType cmdType、字符串cmdText、参数SqlParameter[]commandParameters)
{
SqlCommand cmd=新的SqlCommand();
SqlConnection conn=新的SqlConnection(connectionString);
//我们在这里使用try/catch,因为如果方法抛出异常,我们希望
//关闭连接抛出代码,因为不存在datareader,因此
//CommandBehavior.CloseConnection将不起作用
尝试
{
PrepareCommand(cmd、conn、null、cmdType、cmdText、commandParameters);
SqlDataReader rdr=cmd.ExecuteReader(CommandBehavior.CloseConnection);
cmd.Parameters.Clear();
返回rdr;
}
抓住
{
康涅狄格州关闭();
投掷;
}
}
公共静态对象ExecuteScalar(string connectionString、CommandType cmdType、string cmdText、params SqlParameter[]commandParameters)
{
SqlCommand cmd=新的SqlCommand();
使用(SqlConnection连接=新的SqlConnection(connectionString))
{
PrepareCommand(cmd、connection、null、cmdType、cmdText、commandParameters);
object val=cmd.ExecuteScalar();
cmd.Parameters.Clear();
返回val;
}
}
公共静态对象ExecuteScalar(SqlConnection连接、CommandType cmdType、string cmdText、params SqlParameter[]commandParameters)
{
SqlCommand cmd=新的SqlCommand();
PrepareCommand(cmd、connection、null、cmdType、cmdText、commandParameters);
object val=cmd.ExecuteScalar();
cmd.Parameters.Clear();
//connection.Close();
返回val;
}
///
///将参数数组添加到缓存
///
///参数缓存的键
///要缓存的SqlParameters数组
公共静态void CacheParameters(字符串cacheKey,参数SqlParameter[]commandParameters)
{
parmCache[cacheKey]=commandParameters;
}
///
///检索缓存参数
///
///用于查找参数的键
///缓存的SqlParameters数组
公共静态SqlParameter[]GetCachedParameters(字符串cacheKey)
{
SqlParameter[]cachedParms=(SqlParameter[])parmCache[cacheKey];
if(cachedParms==null)
返回null;
SqlParameter[]clonedParms=新的SqlParameter[cachedParms.Length];
for(int i=0,j=cachedParms.Length;i
这非常简单:每次您有一个新的SQLConnection实例,在它不再使用后,关闭它。。例如:在方法ExecuteNonQuery
中,在方法的末尾关闭它。。对于使用SQLConnection作为参数的其他方法,这意味着您可以实例化