libpq Connection Functions in Visual Studio .NET

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Table 14-1 libpq Connection Functions
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PostgreSQL 8 for Windows
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Connection Parameter host hostaddr port dbname user password connect_timeout options sslmode
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Description The DNS hostname or numeric IP address of the PostgreSQL server The numeric IP address of the PostgreSQL server The TCP port of the PostgreSQL server The database the session connects to The Login Role to use to log into the server The password of the Login Role Maximum time (in seconds) to wait for the connection to establish Use zero to wait indefinitely Command-line options to send to the server Sets SSL preference: disable for no SSL, allow to try SSL first, permit to negotiate with server, and require for only SSL Sets a service name to specify parameters in a pg_serviceconf configuration file
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Table 14-2 PQconnectdb() Connection Parameters
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When listing multiple parameters in the character string, each parameter pair must be separated by one or more spaces Following is an example of creating a new connection:
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const char *conninfo; Pconn *conn; conninfo = "host = 127001 dbname = test user = earl password = auction"; conn = PQconnectdb(conninfo);
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This example connects to the PostgreSQL server running on the local system using the loopback address (127001) It attempts to establish the session with the database test using the earl Login Role The PQconnectdb() function is a blocking function A blocking function stops (blocks) execution of the program until the function completes If the PostgreSQL server specified in the connection string is unavailable, you will have to wait for connect_ timeout seconds before control will return to your program For Windows applications that are event-driven, sometimes this can cause problems While the program is
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14:
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blocking on a connection, it is not responding to events, such as mouse clicks or keyboard entries To solve this problem, you can use the nonblocking connection function The PQconnectStart() function uses the same connection string information as PQconnectdb() and attempts the same type of connection to the specified PostgreSQL server However, PQconnectStart() does not wait for the connection to either establish or fail Program execution continues immediately after the PQconnectStart() function is executed To determine if the connection succeeded (or failed), you must call the PQconnectPoll() function This function returns the status of the connection attempt The PQconnectPoll() function can return one of several status values: CONNECTION_STARTED Waiting for the connection to be established CONNECTION_AWAITING_RESPONSE Waiting for a response from the PostgreSQL server CONNECTION_SSL_STARTUP Negotiating SSL encryption scheme CONNECTION_AUTH_OK Authentication succeeded, waiting for server to finish the connection CONNECTION_SETENV Negotiating session parameters CONNECTION_MADE Connection established, waiting for commands If the connection has not succeeded or failed, you must poll the connection again This should continue until either the connection is established or has ultimately failed After you have established a connection to a PostgreSQL server, there are several functions you can use that allow you to check on the status of the connection, as well as the connection parameters used to establish the connection These are listed and described in Table 14-3 All of the status functions use the PGconn data value returned by the PQconnectdb() function to identify the connection Most of the status functions return a pointer to a string that contains the status information An example of this is
char *user; user = PQuser(conn);
The user character pointer points to the Login Role value used to establish the connection The exception is the PQstatus() function This function returns a ConnStatusType data type, which has two defined values: CONNECTION_OK for good connections CONNECTION_BAD for failed connections
PostgreSQL 8 for Windows
Function PQdb(PGconn *conn) PQuser(PGconn *conn) PQpass(PGconn *conn) PQhost(PGconn *conn) PQport(PGconn *conn) PQoptions(PGconn *conn) PQstatus(PGconn *conn) PQtransactionStatus(PGconn *conn) PQparameterStatus(PGconn *conn, const char *param) PQprotocolVersion(PGconn *conn) PQserverVersion(PGconn *conn) PQerrorMessage(PGconn *conn) PQsocket(PGconn *conn) PQbackendPID(PGconn *conn) PQgetssl(PGconn *conn)
Description Returns the database name of the connection Returns the Login Role used for the connection Returns the password of the Login Role used for the connection Returns the server hostname of the connection Returns the TCP port of the connection Returns any command-line options used to establish the connection Returns the status of the server connection Returns the transaction status of the server Returns the current setting of a parameter param on the server Returns the PostgreSQL backend protocol version Returns the server version as an integer value Returns the most recently generated server error message Returns the server file descriptor of the socket connection Returns the server process ID (PID) of the PostgreSQL process Returns NULL if SSL is not used, or an SSL structure if it is used for the connection
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