The H3DataRowConfig class is used as a way to pass database information to a DataRow class object for opening and reading a row from a database. This class is instantiated and given values for properties like ConnectionName, TableName, PrimarykeyName, PrimaryKeyValue, and more, and the variable is passed as an instantiation parameter to the DataRow class.
H3DataRowConfig Class Documentation
Beispiel #1
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        /// <summary>
        /// Instantiate the class with a Halide.H3DataRowConfig class variable
        /// to specify what should be loaded, and from where. You must
        /// specify either 1) a SQL Command, or 2) a Table Name, Primary Key Name
        /// and Primary Key Value. SQL command overrides all other parameters.
        /// </summary>
        /// <example>
        /// <code>
        /// using Argentini.Halide;
        /// ...
        /// H3DataRowConfig dataCon = new H3DataRowConfig();
        /// dataCon.ConnectionName = "MyConnection";
        /// dataCon.TableName = "News";
        /// dataCon.PrimarykeyName = "News_ID";
        /// dataCon.PrimaryKeyValue = "15";
        /// H3DataRow data = new H3DataRow(dataCon);
        /// </code>
        /// </example>
        /// <param name="DataCon">Halide.H3DataRowConfig object with database settings.</param>
        public H3DataRow(H3DataRowConfig DataCon)
        {
            String SqlCmd = "";
            DataPresent = false;

            ConnectionStringName = DataCon.ConnectionName;

            // If DataCon has a SQL command passed...
            if (!String.IsNullOrEmpty(DataCon.SqlCommand))
            {
                SqlCmd = DataCon.SqlCommand;
            }

            else
            {
                // If DataCon object has table name, primary key name and value passed...
                if (!String.IsNullOrEmpty(DataCon.PrimarykeyName) && !String.IsNullOrEmpty(DataCon.PrimaryKeyValue) && !String.IsNullOrEmpty(DataCon.TableName))
                {
                    SqlCmd = "SELECT TOP 1 * FROM " + DataCon.TableName + " WHERE " + DataCon.PrimarykeyName + "='" + DataCon.PrimaryKeyValue.Replace("'", "''") + "'";
                }

                else
                {
                    // If DataCon object has table name and primary key value passed...
                    if (!String.IsNullOrEmpty(DataCon.PrimaryKeyValue) && !String.IsNullOrEmpty(DataCon.TableName))
                    {
                        using (Halide.H3Reader reader = new Halide.H3Reader("SELECT TOP 1 * FROM " + DataCon.TableName, true, ConnectionStringName))
                        {
                            reader.Read();
                            String PrimaryKey = reader.GetPrimarykeyName();
                            SqlCmd = "SELECT TOP 1 * FROM " + DataCon.TableName + " WHERE " + PrimaryKey + "='" + DataCon.PrimaryKeyValue.Replace("'", "''") + "'";
                        }
                    }

                    // If all else fails, load an empty object
                    else
                    {
                        Column = new DatabaseRow();
                    }
                }
            }

            // Instantiate the data object if valid parameters have been passed
            if (!String.IsNullOrEmpty(SqlCmd))
            {
                using (Halide.H3Reader reader = new Halide.H3Reader(SqlCmd, true, DataCon.ConnectionName))
                {
                    if (reader.HasRows)
                    {
                        DataPresent = true;
                        reader.Read();
                        Column = new DatabaseRow(reader);
                    }

                    else
                    {
                        Column = new DatabaseRow();
                    }
                }
            }
        }