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Make sure that the versioncs and npgsqldll files are available for the compiler The resulting executable program, versionexe, can be run on any workstation that has the NET redistributable package installed (of course, if it connects to a remote PostgreSQL server, you must use the correct server hostname or IP address in the
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PostgreSQL 8 for Windows
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ConnectionString parameter) Here is an example of what you should see when running the program:
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C:\>version Connected to server, version: 820 C:\>
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If the connection fails, an NpgsqlException exception is thrown, which the program catches and displays:
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C:\>version problem connecting to server: FATAL: 28000: password authentication failed for user "earl" C:\>
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The NpgsqlCommand class is used for creating SQL command strings that are sent to the PostgreSQL server Each NpgsqlCommand instance contains a single SQL command Table 13-3 lists and describes the class properties available for the NpgsqlCommand class
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Property CommandText CommandTimeout CommandType Connection LastInsertedIOD Parameters Transaction
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Description Gets or sets the SQL command or function to execute on the PostgreSQL server Gets or sets the time to wait (in seconds) for a command to complete Gets or sets the format of the CommandText property (either Text, the default, or StoredProcedure) Gets or sets the NpgsqlConnection instance used by the command instance Returns the OID of the last inserted row Gets the NpgsqlParametersCollection instance used for the command Gets or sets the NpgsqlTransaction instance within which the command executes
Table 13-3 The NpgsqlCommand Properties
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Microsoft NET Framework
The constructor for an NpgsqlCommand instance can define the CommandText and Connection properties:
NpgsqlCommand(CommandText, Connection)
The SQL command is entered into the CommandText property of the NpgsqlCommand class instance By default, the CommandText property is a text SQL command You can also specify a stored procedure by setting the CommandType property to StoredProcedure The Connection property contains an NpgsqlConnection instance that may or may not be already opened using the Open() method These properties can also be set separately after an instance of the NpgsqlCommand class is created:
NpgsqlConnection conn = new NpgsqlConnection(connstring); NpgsqlCommand command = new NplgsqlCommand(); commandConnection = conn; commandCommandText = "DELETE from auctionbidder WHERE bidderid = 100";
After the NpgsqlCommand object is created, there are several methods that can be used to handle the command, listed and described in Table 13-4 As you can see from Table 13-4, there are three different methods used to execute commands stored in an NpgsqlCommand object The proper method to use depends on the expected results from the stored SQL command: SQL commands that do not return a value SQL commands that return a single value SQL commands that return a result set The following sections describe each of these methods
Method Cancel Clone ExecuteReader ExecuteScalar Prepare
Description Attempts to cancel the execution of a command Creates a new command based on this one Executes a SQL command that returns a result set Executes a SQL command that returns a single value Sends the command to the PostgreSQL server before execution so it can be prepared by the server
ExecuteNonQuery Executes a SQL command that does not return a value
Table 13-4 The NpgsqlCommand Methods
PostgreSQL 8 for Windows
The ExecuteNonQuery() Method
The ExecuteNonQuery() method does what it says, it allows you to send a nonquery SQL command to the server This includes INSERT, UPDATE, and DELETE SQL commands These commands do not return any data values, but do return a status value indicating the number of records affected by the SQL command This status value is returned by the ExecuteNonQuery() method as an integer value, and can be captured by the program After the NpgsqlConnection and NpgsqlCommand objects are created, the ExecuteNonQuery() method sends the SQL command to the PostgreSQL server for processing The resulting status of the SQL command is returned by the PostgreSQL server, and the ExecuteNonQuery() method returns an integer value of the number of records affected by the command:
int32 records; records = commExecuteNonQuery(); ConsoleWriteLine("Deleted {0} records", records);
If anything goes wrong with the SQL command on the PostgreSQL server, an NpgsqlException exception is thrown by the method, which can be caught in a try-catch section The updatevb program demonstrates using the ExecuteNonQuery() method to add a record to the Bidder table:
Imports System Imports SystemData Imports Npgsql Public Class Update Public Shared Sub Main() Dim Dim Dim Dim Dim conn As NpgsqlConnection comm as NpgsqlCommand result as Integer connstring as String comstring as String
connstring = "Server=127001;Port=5432;SSL=True;User Id=earl;" connstring = connstring & "Password=auction;Database=test;" conn = New NpgsqlConnection(connstring) comm = New NpgsqlCommand() commConnection = conn comstring = "INSERT INTO auctionbidder values (150, 'Test', 'Ima'," comstring = comstring & "'329 State St', 'Dyer', 'IN'," comstring = comstring & " '46602', '555-202')" commCommandText = comstring
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