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Table 16-2. Common Data Providers
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System.Data.SqlClient System.Data.OleDb System.Data.OracleClient System.Data.Odbc Npgsql MySql.Data.MySqlClient
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.NET 2.0 .NET 2.0 .NET 2.0 .NET 2.0 http:// npgsql.projects.postgresql.org/ http://dev.mysql.com/downloads/
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The OleDb and ODBC data providers are provided for compatibility with earlier database access technologies. All ADO.NET connection and command classes have the data provider name as the prefix to their class name, as in OdbcConnection and OdbcCommand or OleDbConnection and OleDbCommand.
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Establishing Connections to a Database Engine
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Before you can do any work with a database, you need to establish a connection to it. For instance, you can connect to a locally running instance of SQL Server 2005 Express using the following code: open System.Data open System.Data.SqlClient let connString = @"Server='.\SQLEXPRESS';Integrated Security=SSPI" let conn = new SqlConnection(connString) The value connString is a connection string. Regardless of how you created your connection object, to execute any updates or queries on it you need to open it first:
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CHAPTER 15 WORKING WITH DATA
> conn.Open();; val it : unit = () If this command fails, then you may need to do one of the following: Install SQL Server 2005 Express or a newer version of the same. Consult the latest SQL Server Express samples for alternative connection strings. Add UserInstance='true' to the connection string. This starts the database engine as a user-level process. Change the connection string if you have a different database engine installed and running (for instance, if you are using SQL Server instead of SQL Server Express). Connections established using the same connection string are pooled and reused depending on your database engine. Connections are often a limited resource and should generally be closed as soon as possible within your application.
Tip The More on Connection Strings sidebar contains more details on creating and managing connection
strings. A useful website for complete connection strings is http://www.connectionstrings.com.
Creating a Database
Now that we have established a connection to the database engine, we can explicitly create a database from F# code by executing a SQL statement directly. For example, you can create a database called company as follows: open System.Data open System.Data.SqlClient let execNonQuery conn s = let comm = new SqlCommand(s, conn, CommandTimeout = 10) comm.ExecuteNonQuery() |> ignore execNonQuery conn "CREATE DATABASE company" You will be using execNonQuery in the subsequent sections. This method takes a connection object and a SQL string and executes it as a SQL command, ignoring its result.
Note If you try to create the same database twice, you will receive a runtime exception. However, if you do intend to drop an existing database, you can do so by issuing a DROP DATABASE company SQL command. The DROP command can also be used for other database artifacts, including tables, views, and stored procedures.
C HA PTER 15 WO RK ING WI T H D A TA
MORE ON CONNECTION STRINGS
Before a connection can be opened, its ConnectionString property has to be initialized, typically by passing it to the connection constructor. Although you can assemble this connection string by hand, it is error prone because it is subject to various insertion traps, and the exact keys that various providers accept are many and hard to remember. For these reasons, it is common to either externalize entire connection strings in configuration files (discussed next) or use a ConnectionStringBuilder object from the appropriate provider namespace. This object contains all the known connection keys as properties that can be safely set, avoiding passing values of incorrect type or misspelling the key names. Consider the following example (this time, using SQL Server running on localhost and referencing the company database; initially, before that database is created, you should remove the InitialCatalog reference from your connection string): open System.Data open System.Data.SqlClient let connStr = new SqlConnectionStringBuilder(DataSource="localhost", IntegratedSecurity=true, InitialCatalog="company") On the other hand, not all keys accepted by the various providers are contained in these builder objects, and it is sometimes necessary to add custom key/value pairs. You can do this by using the Add method. For instance, for an OleDb provider, user credentials can be given as follows: connStr.Add("User Id", "your_user_id") connStr.Add("Password", "your_password") This naturally requires extra care to ensure that the proper keys are assigned. You can now access the resulting connection string by reading the ConnectionString property and use it to create a connection object: let conn = new SqlConnection(connStr.ConnectionString) You can also store your connection strings in configuration files (web.config for web applications or YourProgram.exe.config for regular applications). The main advantage here is that connection details can be configured without affecting the application. Consider the following configuration file: < xml version='1.0' encoding='utf-8' > <configuration> <connectionStrings> <add name="MyCS" connectionString="Data Source='localhost';Initial Catalog='company'" /> </connectionStrings> </configuration> This defines a new connection string called MyCS. From within your application, you can read the value of this connection string using the ConfigurationManager class:
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