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16. Database Connectivity
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Although a Data Provider is defined by interfaces, much of the .NET documentation focuses on the use of the concrete Data Provider implementations. Our approach is to focus predominantly on the use of the Data Provider interfaces; this provides a more accurate comparison with the JDBC model and results in more portable and data source independent code. We'll use the SQL Server Data Provider as the basis for implementation discussions and examples. And we'll highlight only key features and differences of the OLE DB Data Provider; for complete details, consult the .NET and OLE DB documentation.
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The DBDemo class, listed below, is a fully functional, if simplistic, application that demonstrates the Data Provider functionality we discuss in this chapter. DBDemo manipulates a simple SQL table containing the name, age, and sex of different people. Specifically, when executed, the DBDemo application does the following: 1. 2. 3. 4. Creates a connection to a SQL Server. Creates three records: one each for Bob, Fred, and Betty. Sets Fred's age to 28. Retrieves and displays the name, sex, and age of each person in the SQL table and displays them on the console, producing the following output:
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Bob is 32 years old; Bob is male. Fred is 28 years old; Fred is male. Betty is 43 years old; Betty is female.
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5. Deletes the records of all people. 6. Closes the SQL Server connection. DBDemo doesn't attempt to exhibit good design or best practice; it's purely a vehicle to demonstrate how to use a .NET Data Provider. We have listed DBDemo in its entirety here, and we'll also use appropriate excerpts throughout this chapter to demonstrate the current feature we're discussing. Before executing the DBDemo application, the reader must
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Have access to a Microsoft SQL Server. The SQL Server Desktop Engine (MSDE) that ships with Visual Studio .NET is sufficient for this example. Create a database on the SQL Server named MyDataBase, which can be done using the SQL Server Enterprise Manager. Create a people table in the newly created MyDataBase, which can easily be done with the SQL Server Query Analyzer, using the following SQL script:
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CREATE TABLE people ( name varchar (20) NOT NULL, age int NOT NULL, sex varchar (10) NOT NULL)
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Modify the DBDemo code by changing the value of the private DBDemo.sqlServerName field to the name of the SQL Server being accessed. For
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example, if your SQL Server instance is running on the mySqlHost.com server, you should do the following:
private string sqlServerName = "mySqlHost.com" ;
Build DBDemo using the C# compiler; instructions on using the compiler are available in 3, "Creating Assemblies."
using System; using System.Data; using System.Data.SqlClient; public class DBDemo { // Private field to hold DB connection reference private IDbConnection sqlCon = null; // Private field to hold the SQL Server Name private string sqlServerName = "MySQLServer"; private void Connect() { // Create a connection to the specified SQL Server using // a database named MyDatabase // and integrated Windows security string conStr = "Data Source=" + sqlServerName + " ; Database=MyDataBase;" + " Integrated Security=SSPI"; sqlCon = new SqlConnection(conStr); // Open the SQL Server Connection sqlCon.Open(); } private void Disconnect() { // Close the SQL Server connection sqlCon.Close(); } private void InsertPeople() { // Create and start a transaction IDbTransaction sqlTx = sqlCon.BeginTransaction(); // Create the SQL command and assign it to // participate in the local transaction IDbCommand sqlCmd = sqlCon.CreateCommand(); sqlCmd.CommandType = CommandType.Text; sqlCmd.Transaction = sqlTx; try { // Insert three records into the "people" table sqlCmd.CommandText = "INSERT INTO people (name,age,sex)" + " VALUES ('Bob', 32, 'male')"; sqlCmd.ExecuteNonQuery(); sqlCmd.CommandText = "INSERT INTO people (name,age,sex)" + " VALUES ('Fred', 27, 'male')"; sqlCmd.ExecuteNonQuery();
16. Database Connectivity sqlCmd.CommandText = "INSERT INTO people (name,age,sex)" + " VALUES ('Betty', 43, 'female')"; sqlCmd.ExecuteNonQuery(); // Commit the transaction sqlTx.Commit(); } catch { // An exception has occurred, // rollback the transaction sqlTx.Rollback(); }
private void DeletePeople() { // Create the SQL command to delete all records from // the "people" table IDbCommand sqlCmd = sqlCon.CreateCommand(); sqlCmd.CommandType = CommandType.Text; sqlCmd.CommandText = "DELETE FROM people"; // Execute the DELETE command sqlCmd.ExecuteNonQuery(); } private void ListPeople() { // Create and configure the SQL command IDbCommand sqlCmd = sqlCon.CreateCommand(); sqlCmd.CommandType = CommandType.Text; sqlCmd.CommandText = "SELECT name, sex, age FROM people"; // Execute the SQL command and create the IDataReader IDataReader sqlRdr = sqlCmd.ExecuteReader(); // Loop through the results and display each record while (sqlRdr.Read()) { Console.WriteLine("{0} is {1} years old; {0} is {2}.", sqlRdr.GetString(0), // Typed get sqlRdr["age"], // Named indexer sqlRdr[1]); // Integer indexer } // Close the IDataReader sqlRdr.Close(); } public void SetAge(string p_name, int p_age) { // Create a Text command to perform an UPDATE // the age of a specified person IDbCommand sqlCmd = sqlCon.CreateCommand(); sqlCmd.CommandType = CommandType.Text; sqlCmd.CommandText = "UPDATE people SET age = @age" + " WHERE name = @name"; // Instantiate and add parameters, order is irrelevant IDbDataParameter nameParam = sqlCmd.CreateParameter(); nameParam.ParameterName = "@name"; nameParam.DbType = DbType.String; nameParam.Value = p_name; sqlCmd.Parameters.Add(nameParam);
16. Database Connectivity IDbDataParameter ageParam = sqlCmd.CreateParameter(); ageParam.ParameterName = "@age"; ageParam.DbType = DbType.Int32; ageParam.Value = p_age; sqlCmd.Parameters.Add(ageParam); // Execute the command sqlCmd.ExecuteNonQuery();
public static void Main() { // Instantiate new DBDemo object DBDemo dbDemo = new DBDemo(); // Open database connection dbDemo.Connect(); // Create the demo people records dbDemo.InsertPeople(); // Set the age of "Fred" dbDemo.SetAge("Fred", 28); // List the people records dbDemo.ListPeople(); // Delete the people records dbDemo.DeletePeople(); // Close the database connection dbDemo.Disconnect();
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