Database Connection Control Functions

There are database connection control functions for controlling the connections to database servers. An application can connect to multiple servers at a time. For example, a client connects to multiple databases. Each connection is represented by a PGconn object, which is obtained from the function PQconnectdb, PQconnectdbParams, or PQsetdbLogin. Note that these functions will always return a non-null object pointer, unless memory allocation fails. The API for establishing a connection is stored in the PGconn object. The PQstatus function can be called to check the return value for a successful connection.

• PQconnectdbParams
  
• PQconnectdb
  
• PQconninfoParse
  
• PQconnectStart
  
• PQerrorMessage
  
• PQsetdbLogin
  
• PQfinish
  
• PQreset
  
• PQstatus