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In this example, I am going to update the punchline field for any record in the joke table where the nid field is greater than or equal to 3 $num_updated = db_update('joke') ->fields(array( 'punchline' => 'Take my wife please!', )) ->condition('nid', 3, '>=') ->execute(); If I wanted to see how many rows were affected by the update, I could use the value assigned to $num_updated after the update is executed Finally let s delete all of the rows from the joke table where the punchline is equal to Take my wife please! I ll use the db_delete function and the ->condition modifier to specify the condition for deleting records from the table $num_deleted = db_delete('joke') ->condition('punchline', 'Take my wife please!') ->execute();.

IDataParameter[] GetFillParameters(); int Update(DataSet dataSet); }

The next key interface to be aware of is IDataReader, which represents the common behaviors supported by a given data reader object. When you obtain an IDataReader-compatible type from an ADO.NET data provider, you can iterate over the result set in a forward-only, read-only manner: public interface IDataReader : IDisposable, IDataRecord { int Depth { get; } bool IsClosed { get; } int RecordsAffected { get; } void Close(); DataTable GetSchemaTable(); bool NextResult(); bool Read(); } Finally, IDataReader extends IDataRecord, which defines many members that allow you to extract a strongly typed value from the stream, rather than casting the generic System.Object retrieved from the data reader s overloaded indexer method. Here is a partial listing of the various GetXXX() methods defined by IDataRecord (see the .NET Framework 4.0 SDK documentation for a complete listing): public interface IDataRecord { int FieldCount { get; } object this[ string name ] { get; } object this[ int i ] { get; } bool GetBoolean(int i); byte GetByte(int i); char GetChar(int i); DateTime GetDateTime(int i); decimal GetDecimal(int i); float GetFloat(int i); short GetInt16(int i); int GetInt32(int i); long GetInt64(int i); ... bool IsDBNull(int i); }

There are various ways to retrieve query results depending on whether you need a single row or the whole result set, or whether you are planning to get a range of results for internal use or for display as a paged result set.

Note You can use the IDataReader.IsDBNull() method to discover programmatically whether a specified field is set to null before obtaining a value from the data reader (to avoid triggering a runtime exception). Also recall that C# supports nullable data types (see 4), which are ideal for interacting with data columns that could be NULL in the database table.

At this point, you should have a better idea of the common functionality found among all .NET data providers. Recall that even though the exact names of the implementing types will differ among data providers, you can program against these types in a similar manner that s the beauty of interfacebased polymorphism. For example, if you define a method that takes an IDbConnection parameter, you can pass in any ADO.NET connection object: public static void OpenConnection(IDbConnection cn) { // Open the incoming connection for the caller. cn.Open(); }

If all you need from the database is a single value, you can use the ->fetchField() method to retrieve that value. Here is an example of retrieving the total number of records from the joke table: $nbr_records = db_query("SELECT count(nid) FROM {joke}")->fetchField();

Note Interfaces are not strictly required; you can achieve the same level of abstraction using abstract base classes (such as DbConnection) as parameters or return values.

The same holds true for member return values. For example, consider the following simple C# Console Application project (named MyConnectionFactory), which allows you to obtain a specific connection object based on the value of a custom enumeration. For diagnostic purposes, you simply print out the underlying connection object using reflection services, and then enter the following code: using using using using System; System.Collections.Generic; System.Linq; System.Text;