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When it comes to the act of updating an existing record in the Inventory table, the first thing you must decide is what you want to allow the caller to change, whether it s the car s color, the pet name, the make, or all of the above. One way to give the caller complete flexibility is to define a method that takes a string type to represent any sort of SQL statement, but that is risky at best. Ideally, you want to have a set of methods that allow the caller to update a record in a variety of ways. However, for this simple data access library, you will define a single method that allows the caller to update the pet name of a given automobile: public void UpdateCarPetName(int id, string newPetName) { // Get ID of car to modify and new pet name. string sql = string.Format("Update Inventory Set PetName = '{0}' Where CarID = '{1}'", newPetName, id);

using(SqlCommand cmd = new SqlCommand(sql, this.sqlCn)) { cmd.ExecuteNonQuery(); } }

PostgreSQL VARCHAR varchar CHAR character TINYTEXT text TINYTEXT text MEDIUMTEXT text LONGTEXT text TEXT text TINYINT serial SMALLINT serial MEDIUMINT serial BIGINT bigserial INT serial TINYINT smallint SMALLINT smallint MEDIUMINT int BIGINT bigint SQLite VARCHAR VARCHAR TEXT TEXT TEXT TEXT TEXT INTEGER INTEGER INTEGER INTEGER INTEGER INTEGER INTEGER INTEGER INTEGER

Next, you need to add a selection method. As you saw earlier in this chapter, a data provider s data reader object allows for a selection of records using a read-only, forward-only server-side cursor. As you call the Read() method, you can process each record in a fitting manner. While this is all well and good, you need to contend with the issue of how to return these records to the calling tier of your application. One approach would be to populate and return a multidimensional array (or other such return value, such as a generic List<NewCar> object) with the data obtained by the Read() method. Here is a second way to obtain data from the Inventory table that uses the latter approach: public List<NewCar> GetAllInventoryAsList() { // This will hold the records. List<NewCar> inv = new List<NewCar>(); // Prep command object. string sql = "Select * From Inventory"; using (SqlCommand cmd = new SqlCommand(sql, this.sqlCn)) { SqlDataReader dr = cmd.ExecuteReader(); while (dr.Read()) { inv.Add(new NewCar { CarID = (int)dr["CarID"], Color = (string)dr["Color"], Make = (string)dr["Make"], PetName = (string)dr["PetName"] }); } dr.Close(); } return inv; } Still another approach is to return a System.Data.DataTable object, which is actually part of the disconnected layer of ADO.NET. You will find complete coverage of the disconnected layer in the next chapter; however, for the time being, you should understand that a DataTable is a class type that represents a tabular block of data (e.g., a grid on a spreadsheet). Internally, the DataTable class represents data as a collection of rows and columns. While you can fill these collections programmatically, the DataTable type provides a method named Load() that automatically populates these collections using a data reader object! Consider the following methods, which return data from Inventory as a DataTable:

public DataTable GetAllInventoryAsDataTable() { // This will hold the records. DataTable inv = new DataTable(); // Prep command object. string sql = "Select * From Inventory"; using(SqlCommand cmd = new SqlCommand(sql, this.sqlCn)) { SqlDataReader dr = cmd.ExecuteReader(); // Fill the DataTable with data from the reader and clean up. inv.Load(dr); dr.Close(); } return inv; }

Type Size int no float tiny float small float medi float big float normal numeric no blob big blob no rmal rmal um MySQL rmal