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Again, the npgsqldll file must be located in either the same directory as the source code file or in a directory listed within the PATH environment variable The System Datadll file is already located in the standard NET library directory Besides referencing the Npgsql library file in the compiler command, you must also include the Npgsql and SystemData namespaces in the Visual Basic NET or C# programs that use the Npgsql library By including the namespaces, you can directly reference any of the classes contained in the namespaces In a C# program, this is done with the using statement at the start of a program:
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using SystemData; using Npgsql;
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Now you can reference any class in the Npgsql namespace within the C# program In a Visual Basic NET program, this is done with the Imports statement:
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Imports SystemData Imports Npgsql
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The next section walks through the classes included in the Npgsql library, and shows how to use them in both C# and Visual Basic NET programs
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THE NPGSQL LIBRARY
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The Npgsql library contains the classes necessary for establishing a connection with a PostgreSQL server, querying tables and views, inserting, updating, and deleting records, and performing transactions Table 13-1 lists and describes the classes provided by the Npgsql library
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Class NpgsqlCommand NpgsqlCommandBuilder NpgsqlConnection NpgsqlDataAdapter NpgsqlDataReader NpgsqlError NpgsqlEventLog NpgsqlException NpgsqlNoticeEventArgs NpgsqlNotificationEventArgs NpgsqlParameter NpgsqlParameterCollection NpgsqlTransaction ServerVersion
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Description Contains a SQL statement or function to be executed on a PostgreSQL database Builds commands for automatically inserting, updating, and deleting table records Creates a connection to a PostgreSQL server Contains record data for SELECT, INSERT, UPDATE, and DELETE SQL commands Reads a result set from a query and makes the data values available Contains error and notice messages returned by the PostgreSQL server Handles Npgsql event and debug logging The exception that is thrown if an Npgsql error event occurs Notice events for less important errors Parameters for notification events Contains parameters used for Npgsql commands A collection of parameters used in Npgsql commands and mappings to columns in a dataset Contains a set of SQL commands that are bundled into a complete transaction for the database Contains the version of the PostgreSQL server
Table 13-1 Npgsql Classes
The classes contain members and properties that are used to interact with the PostgreSQL server to help you perform standard SQL commands and functions in your application code The following sections describe these classes in more detail
The NpgsqlConnection Class
The most basic operation provided by Npgsql is to allow your NET program to connect with either a local or a remote PostgreSQL server This is accomplished with the NpgsqlConnection class The format for the NpgsqlConnection class constructor is
NpgsqlConnection(connectionstring)
13:
Microsoft NET Framework
The connectionstring parameter sets the values used to define the PostgreSQL server connection This is stored in the ConnectionString property of the class The ConnectionString property is a text string that can be built using standard string techniques The ConnectionString property uses identifiers and values to define the connection properties The identifiers and values are defined in the string using the following format:
ident1=value1;ident2=value2;ident3=value3
Each identifier/value pair is separated by a semicolon The identifiers used in the ConnectionString property are listed and described in Table 13-2
Identifier Server Port Protocol Database User Id Password SSL Pooling MinPoolSize MaxPoolSize Encoding Timeout CommandTimeout Sslmode ConnectionLifeTime SyncNotification
Description The hostname or IP address of the PostgreSQL server The TCP port of the PostgreSQL server The protocol to use if not automatic May be 2 for pre-version 73 PostgreSQL servers or 3 for version 73 or later servers The name of the database to connect to The default is the username The Login Role to connect to the server as The plain-text password for the Login Role specified Determines whether to use SSL (True or False), similar to Sslmode The default is False Controls connection pooling (True or False) The default is False Sets the minimum size of the connection pool when using pooling Sets the maximum size of the connection pool when using pooling Sets the encoding to use for the connection (ASCII or UNICODE) The default is ASCII Sets the time to wait for the connection to open (in seconds) The default is 15 seconds Sets the time to wait for a command to finish executing (in seconds) The default is 20 seconds Sets the mode for the SSL connection (Prefer, Require, Allow, or Disable) The default is Disable Sets the time to wait before closing unused connections if a connection pool is used (in seconds) The default is 15 seconds Specifies whether Npgsql should use synchronous notifications
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