в 15:31, 26 мая 2010

2010-05-26T15:31:19Z

Admin: 1 версия

2010-05-26T11:42:27Z

1 версия

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==Catch Sql command exceptions==

<source lang="csharp">

using System;
using System.Data;
using System.Data.SqlClient;
class SqlExceptionDemo {
static void Main(){
string connString = "server=(local)\\SQLEXPRESS;database=MyDatabase;Integrated Security=SSPI";
SqlConnection conn = new SqlConnection(connString);
SqlCommand cmd = conn.CreateCommand();

cmd.rumandType = CommandType.StoredProcedure;
cmd.rumandText = "something wrong here";
try {
conn.Open();

SqlDataReader dr = cmd.ExecuteReader();
string str = dr.GetValue(20).ToString();
dr.Close();
}
catch (System.InvalidOperationException ex)
{
string str;
str = "Source:" + ex.Source;
str += "\n" + "Message:"+ ex.Message;
str += "\n" + "\n";
str += "\n" + "Stack Trace :" + ex.StackTrace;
Console.WriteLine (str, "Specific Exception");
}
catch (System.Data.SqlClient.SqlException ex)
{
string str;
str = "Source:" + ex.Source;
str += "\n" + "Message:" + ex.Message;
Console.WriteLine (str, "Database Exception");
}
catch (System.Exception ex)
{
string str;
str = "Source:" + ex.Source;
str += "\n"+ "Message:" + ex.Message;
Console.WriteLine (str, "Generic Exception");
}
finally
{
if ( conn.State == ConnectionState.Open)
{
Console.WriteLine ("Finally block closing the connection", "Finally");
conn.Close();
}
}
}
}

</source>

==Deal with multiple Sql error in SqlException==

<source lang="csharp">
using System;
using System.Data;
using System.Data.SqlClient;
class SqlExceptionDemo {
static void Main(){
string connString = "server=(local)\\SQLEXPRESS;database=MyDatabase;Integrated Security=SSPI";
SqlConnection conn = new SqlConnection(connString);
SqlCommand cmd = conn.CreateCommand();
cmd.rumandType = CommandType.StoredProcedure;
cmd.rumandText = "wrong";
try
{
conn.Open();
cmd.ExecuteNonQuery();
}
catch (System.Data.SqlClient.SqlException ex)
{
string str ="";
for (int i = 0; i < ex.Errors.Count; i++)
{
str += "\n" + "Index #" + i + "\n" +
"Exception : " + ex.Errors[i].ToString() + "\n" +
"Number:" + ex.Errors[i].Number.ToString() + "\n"
;
}

Console.WriteLine(str);
}
catch (System.Exception ex)
{
string str;
str = "Source:"+ ex.Source;
str += "\n"+ "Error Message:"+ ex.Message;
Console.WriteLine (str);
}
finally
{
if (conn.State == ConnectionState.Open)
{
Console.WriteLine ("Finally block closing the connection", "Finally");
conn.Close();
}
}
}
}

</source>

==SqlException detail info: line number, procedure, server==

<source lang="csharp">
using System;
using System.Data;
using System.Data.SqlClient;
class SqlExceptionDemo {
static void Main(){
string connString = "server=(local)\\SQLEXPRESS;database=MyDatabase;Integrated Security=SSPI";
SqlConnection conn = new SqlConnection(connString);
SqlCommand cmd = conn.CreateCommand();
cmd.rumandType = CommandType.StoredProcedure;
cmd.rumandText = "wrong command";
try {
conn.Open();
cmd.ExecuteNonQuery();
}
catch (System.Data.SqlClient.SqlException ex)
{
string str;
str = "Source:"+ ex.Source;
str += "\n"+ "Number:"+ ex.Number.ToString();
str += "\n"+ "Message:"+ ex.Message;
str += "\n"+ "Class:"+ ex.Class.ToString ();
str += "\n"+ "Procedure:"+ ex.Procedure.ToString();
str += "\n"+ "Line Number:"+ex.LineNumber.ToString();
str += "\n"+ "Server:"+ ex.Server.ToString();

Console.WriteLine (str, "Database Exception");
}
catch (System.Exception ex)
{
string str;
str = "Source:"+ ex.Source;
str += "\n"+ "Error Message:"+ ex.Message;
Console.WriteLine (str, "General Exception");
}
finally
{
if (conn.State == ConnectionState.Open)
{
Console.WriteLine ("Finally block closing the connection", "Finally");
conn.Close();
}
}
}
}

</source>

==SqlException message==

<source lang="csharp">

using System;
using System.Data;
using System.Data.SqlClient;
class SqlExceptionDemo {
static void Main(){
string connString = "server=(local)\\SQLEXPRESS;database=MyDatabase;Integrated Security=SSPI";
SqlConnection conn = new SqlConnection(connString);
SqlCommand cmd = conn.CreateCommand();

cmd.rumandType = CommandType.StoredProcedure;

cmd.rumandText = "wrong sql";
try{
conn.Open();
SqlDataReader dr = cmd.ExecuteReader();
dr.Close();
} catch (System.Data.SqlClient.SqlException ex) {
string str;
str = "Source:" + ex.Source;
str += "\n" + "Exception Message:" + ex.Message;
Console.WriteLine(str);
}
catch (System.Exception ex)
{
string str;
str = "Source:" + ex.Source;
str += "\n" + "Exception Message:" + ex.Message;
Console.WriteLine(str);
}
finally
{
if (conn.State == ConnectionState.Open)
{
Console.WriteLine("Finally block closing the connection", "Finally");
conn.Close();
}
}
}
}

</source>

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в 15:31, 26 мая 2010

Admin: 1 версия