本文整理汇总了C#中NpgsqlConnection.BeginTransaction方法的典型用法代码示例。如果您正苦于以下问题：C# NpgsqlConnection.BeginTransaction方法的具体用法？C# NpgsqlConnection.BeginTransaction怎么用？C# NpgsqlConnection.BeginTransaction使用的例子？那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类NpgsqlConnection的用法示例。
在下文中一共展示了NpgsqlConnection.BeginTransaction方法的3个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C#代码示例。
示例1: DeleteRole
//
// RoleProvider.DeleteRole
//
public override bool DeleteRole(string rolename, bool throwOnPopulatedRole)
{
if (!RoleExists(rolename))
{
throw new ProviderException("Role does not exist.");
}
if (throwOnPopulatedRole && GetUsersInRole(rolename).Length > 0)
{
throw new ProviderException("Cannot delete a populated role.");
}
NpgsqlConnection conn = new NpgsqlConnection(connectionString);
NpgsqlCommand cmd =
new NpgsqlCommand(
"DELETE FROM " + rolesTable + "" + " WHERE role_name = @role_name AND application_name = @application_name", conn);
cmd.Parameters.Add("@role_name", NpgsqlDbType.Text, 255).Value = rolename;
cmd.Parameters.Add("@application_name", NpgsqlDbType.Text, 255).Value = ApplicationName;
NpgsqlCommand cmd2 =
new NpgsqlCommand(
"DELETE FROM " + usersInRolesTable + "" + " WHERE role_name = @role_name AND application_name = @application_name",
conn);
cmd2.Parameters.Add("@role_name", NpgsqlDbType.Text, 255).Value = rolename;
cmd2.Parameters.Add("@application_name", NpgsqlDbType.Text, 255).Value = ApplicationName;
NpgsqlTransaction tran = null;
try
{
conn.Open();
tran = conn.BeginTransaction();
cmd.Transaction = tran;
cmd2.Transaction = tran;
cmd2.ExecuteBlind();
cmd.ExecuteBlind();
tran.Commit();
}
catch (NpgsqlException e)
{
try
{
if (tran != null)
{
tran.Rollback();
}
}
catch
{
}
if (WriteExceptionsToEventLog)
{
WriteToEventLog(e, "DeleteRole");
return false;
}
else
{
throw e;
}
}
finally
{
cmd.Dispose();
conn.Close();
}
return true;
}示例2: RemoveUsersFromRoles
//
// RoleProvider.RemoveUsersFromRoles
//
public override void RemoveUsersFromRoles(string[] usernames, string[] rolenames)
{
foreach (string rolename in rolenames)
{
if (!RoleExists(rolename))
{
throw new ProviderException("Role name not found.");
}
}
foreach (string username in usernames)
{
foreach (string rolename in rolenames)
{
if (!IsUserInRole(username, rolename))
{
throw new ProviderException("User is not in role.");
}
}
}
NpgsqlConnection conn = new NpgsqlConnection(connectionString);
NpgsqlCommand cmd =
new NpgsqlCommand(
"DELETE FROM " + usersInRolesTable + "" +
" WHERE user_name = @user_name AND role_name = @role_name AND application_name = @application_name", conn);
NpgsqlParameter userParm = cmd.Parameters.Add("@user_name", NpgsqlDbType.Text, 255);
NpgsqlParameter roleParm = cmd.Parameters.Add("@role_name", NpgsqlDbType.Text, 255);
cmd.Parameters.Add("@application_name", NpgsqlDbType.Text, 255).Value = ApplicationName;
NpgsqlTransaction tran = null;
try
{
conn.Open();
tran = conn.BeginTransaction();
cmd.Transaction = tran;
foreach (string username in usernames)
{
foreach (string rolename in rolenames)
{
userParm.Value = username;
roleParm.Value = rolename;
cmd.ExecuteBlind();
}
}
tran.Commit();
}
catch (NpgsqlException e)
{
try
{
if (tran != null)
{
tran.Rollback();
}
}
catch
{
}
if (WriteExceptionsToEventLog)
{
WriteToEventLog(e, "RemoveUsersFromRoles");
}
else
{
throw e;
}
}
finally
{
cmd.Dispose();
conn.Close();
}
}示例3: AddUsersToRoles
//
// System.Web.Security.RoleProvider methods.
//
//
// RoleProvider.AddUsersToRoles
//
public override void AddUsersToRoles(string[] usernames, string[] rolenames)
{
foreach (string rolename in rolenames)
{
if (!RoleExists(rolename))
{
throw new ProviderException("Role name not found.");
}
}
foreach (string username in usernames)
{
if (username.IndexOf(',') > 0)
{
throw new ArgumentException("User names cannot contain commas.");
}
foreach (string rolename in rolenames)
{
if (IsUserInRole(username, rolename))
{
throw new ProviderException("User is already in role.");
}
}
}
NpgsqlConnection conn = new NpgsqlConnection(connectionString);
NpgsqlCommand cmd =
new NpgsqlCommand(
"INSERT INTO " + usersInRolesTable + "" + " (user_name, role_name, application_name) " +
" Values(@user_name, @role_name, @application_name)", conn);
NpgsqlParameter userParm = cmd.Parameters.Add("@user_name", NpgsqlDbType.Text, 255);
NpgsqlParameter roleParm = cmd.Parameters.Add("@role_name", NpgsqlDbType.Text, 255);
cmd.Parameters.Add("@application_name", NpgsqlDbType.Text, 255).Value = ApplicationName;
NpgsqlTransaction tran = null;
try
{
conn.Open();
tran = conn.BeginTransaction();
cmd.Transaction = tran;
foreach (string username in usernames)
{
foreach (string rolename in rolenames)
{
userParm.Value = username;
roleParm.Value = rolename;
cmd.ExecuteBlind();
}
}
tran.Commit();
}
catch (NpgsqlException e)
{
try
{
if (tran != null)
{
tran.Rollback();
}
}
catch
{
}
if (WriteExceptionsToEventLog)
{
WriteToEventLog(e, "AddUsersToRoles");
}
else
{
throw e;
}
}
finally
{
cmd.Dispose();
conn.Close();
}
}