Create class using array

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I want to create a class file in asp.net c# for update command.

How can I create update command using array?
I can't declare the update command statically because its different for different tables.

Please help me how to create this and how to declare array and call the function in our asp.net page.

Thanks in advance.

Posted 16-May-11 20:31pm

rahul dev123

Updated 16-May-11 21:25pm

Dalek Dave

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Sergey Alexandrovich Kryukov 17-May-11 2:49am

Not clear. What is "class file"? What the class should do? Why what you want is a problem?
--SA

Dalek Dave 17-May-11 3:25am

Edited for Grammar and Readability.

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OriginalGriff · Answer 1 · 2011-05-16T20:51:00

Here is a generic routine to do it:

/// <summary>
/// Update a database entry with new field data
/// </summary>
/// <param name="table">Name of table to update</param>
/// <param name="fieldsList">Comma separated list of fields to be updated</param>
/// <param name="condition">If not null, condition of form "ID=@1".
/// The first parameter in the 'parameters' list will be the condition '@1'</param>
/// <param name="parameters">List of parameters to update with</param>
public static void Update(string table, string fieldsList, string condition, params object[] parameters)
    {
    StringBuilder sb = new StringBuilder(1000);
    sb.Append(string.Format("UPDATE {0} SET ", table));
    string[] fields = fieldsList.Split(',');
    int firstSetting = (string.IsNullOrEmpty(condition) ? 0 : 1);
    if ((fields.Length + firstSetting) > parameters.Length)
        {
        throw new ArgumentException("Not enough parameters for this field list");
        }
    string prefix = "";
    for (int i = 0; i < fields.Length; i++)
        {
        firstSetting++;
        sb.Append(string.Format("{0}{1}=@{2}", prefix, fields[i],firstSetting.ToString()));
        prefix = ",";
        }
    sb.Append(" " + (string.IsNullOrEmpty(condition) ? "" : "WHERE " + condition));
    Execute(sb.ToString(), parameters);
    }
/// <summary>
/// Execute an Sql command with parameters, and return the command
/// object for later use.
/// Parameters are added as "@1", "@2", etc.
/// </summary>
/// <param name="sql">SQL command</param>
/// <param name="parameters">List of parameters to add.</param>
/// <returns>Constructed SQL object</returns>
private static SqlCommand Execute(string sql, params object[] parameters)
    {
    SqlCommand cmd = new SqlCommand(sql, con);
    Execute(cmd, parameters);
    return cmd;
    }
/// <summary>
/// Execute an Sql command with parameters
/// Parameters are added as "@1", "@2", etc.
/// </summary>
/// <param name="cmd">SQL command object</param>
/// <param name="parameters">List of parameters to add.</param>
private static void Execute(SqlCommand cmd, params object[] parameters)
    {
    AddParameters(cmd, parameters);
    cmd.ExecuteNonQuery();
    }
/// <summary>
/// Add all the parameters to the SQL Command object
/// Parameters are added in order as '@1', '@2', etc.
/// Replaces null with DBNull.Value
/// </summary>
/// <param name="cmd">SQL Command to add to</param>
/// <param name="parameters">List of parameters to add</param>
private static void AddParameters(SqlCommand cmd, object[] parameters)
    {
    int i = 1;
    cmd.Parameters.Clear();
    foreach (object o in parameters)
        {
        if (o == null)
            {
            cmd.Parameters.AddWithValue("@" + i++, DBNull.Value);
            }
        else
            {
            cmd.Parameters.AddWithValue("@" + i++, o);
            }
        }
    }

Wayne Gaylard · Answer 2 · 2011-05-16T21:03:00

If I understand you correctly, you want to update several different tables using only one function. This can be done if you are using Stored Procedures in your DataBase with a function like this:

C#

public int ExecuteNonQuery(string connectionString, string spName, Dictionary<string,object> parameters)
        {
            using (SqlConnection con = new SqlConnection(connectionString))
            {
                SqlCommand cmdExecute = new SqlCommand(spName, con);
                cmdExecute.CommandType = System.Data.CommandType.StoredProcedure;
                foreach (KeyValuePair<string, object> kvp in parameters)
                {
                    cmdExecute.Parameters.AddWithValue(kvp.Key, kvp.Value);
                }
                con.Open();
                return cmdExecute.ExecuteNonQuery();
            }
        }

where spName is the name of the Stored Procedure, and the Dictionary<string,> contains your parameters, so you would call it like this:

C#

public void Update()
        {
            Dictionary<string,> parameters = new Dictionary<string,>();
            parameters.Add("@Param1", param1Value);
            parameters.Add("@Param2", param2Value);
            int rowsAffected = ExecuteNonQuery("yourConnectionString", "yourStoredProcName", parameters);
        }

Hope this helps

Create class using array

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