.net barcode reader sdk NpgsqlConnection ConnectionString Values in Visual Studio .NET

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Table 13-2 NpgsqlConnection ConnectionString Values
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A typical ConnectionString string looks like this:
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Server=127001;Port=5432;User Id=earl;Password=auction;Database=test
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The identifiers and values define the typical connection parameters used to connect to a PostgreSQL server database, using a specific Login Role Remember, the PostgreSQL server must be configured to accept connections, and the pg_hbaconf configuration file must be configured to allow the specific Login Role to connect to the specified database (see 3) After an NpgsqlConnection class instance is created, there are two class methods that are used to control the connection The Open() class method is used to start a session with the PostgreSQL server If the connection fails, the Open() method throws an NpgsqlException exception This should be caught within a try-catch block and handled accordingly If the exception is not caught by the program, the CLR will abort the application and produce an error message to the user not exactly user-friendly When you are finished with the PostgreSQL session, use the Close() class method to stop the session This disconnects from the PostgreSQL server and closes all of your session objects Likewise, if the Close() method fails, it throws an NpgsqlException exception There are a few NpgsqlConnection class properties that come in handy after the connection is established: ServerVersion Contains information on the PostgreSQL server version State Contains information on the state of the connection (Opened or Closed) BackendProtocolVersion Contains information on the PostgreSQL protocol version used by the PostgreSQL server An example of creating a new connection to a PostgreSQL server using the C# programming language is demonstrated in the versioncs program:
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using System; using SystemData; using Npgsql;
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public class Version { public static void Main(String[] args) { String connstring = "Server=127001;Port=5432;SSL=True;"; connstring = connstring + "User ID=earl;Password=auction;Database=test;"; NpgsqlConnection conn = new NpgsqlConnection(connstring); try
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13:
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{ connOpen(); ServerVersion sv = connServerVersion; String vers = svToString(); ConsoleWriteLine("Connected to server, version: {0}", vers); } catch( NpgsqlException e) { ConsoleWriteLine("problem connecting to server: {0}", eMessage); } finally { connClose(); } } }
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As you can see from the versioncs program, the ConnectionString property for the NpgsqlConnection object can be built as any type of String value, including a String that has been created from several pieces Remember to include a semicolon between each value in the ConnectionString This code example establishes a connection to the PostgreSQL server running on the local system (using the loopback network address 127001), logging into the test database using the earl Login Role created in 12 You may have to change some of these values if your PostgreSQL environment is different The ConnectionString value is long, so to split it up I built the string from two parts The NpgsqlConnection instance is created using the ConnectionString parameter This does not need to be placed within a try-catch block, as the connection is not attempted until the Open() method is called Within the try-catch block section, after opening the connection using the Open() method, the program uses the ServerVersion property of the connection to retrieve the version of the PostgreSQL server The ServerVersion property uses the ServerVersion class to hold the version value This class contains a ToString() method that converts the version to a simple string value that can be displayed You can also extract the individual major, minor, and patch values of the version as integer values for comparison After displaying the version, the program uses the Close() method to stop the PostgreSQL session The try-catch block catches any NpgsqlException exceptions that are thrown by the methods, and displays the error message to the user It is always a good idea to catch exceptions rather than letting the NET CLR produce its own ugly error messages and abruptly terminate the program To compile the versioncs program from the command prompt, type
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