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PostgreSQL 9.3.25 Documentation
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Chapter 31. libpq - C Library

Table of Contents

31.1. Database Connection Control Functions

31.1.1. Connection Strings
31.1.2. Parameter Key Words

31.2. Connection Status Functions

31.3. Command Execution Functions

31.3.1. Main Functions
31.3.2. Retrieving Query Result Information
31.3.3. Retrieving Other Result Information
31.3.4. Escaping Strings for Inclusion in SQL Commands

31.4. Asynchronous Command Processing

31.5. Retrieving Query Results Row-By-Row

31.6. Canceling Queries in Progress

31.7. The Fast-Path Interface

31.8. Asynchronous Notification

31.9. Functions Associated with the COPY Command

31.9.1. Functions for Sending COPY Data
31.9.2. Functions for Receiving COPY Data
31.9.3. Obsolete Functions for COPY

31.10. Control Functions

31.11. Miscellaneous Functions

31.12. Notice Processing

31.13. Event System

31.13.1. Event Types
31.13.2. Event Callback Procedure
31.13.3. Event Support Functions
31.13.4. Event Example

31.14. Environment Variables

31.15. The Password File

31.16. The Connection Service File

31.17. LDAP Lookup of Connection Parameters

31.18. SSL Support

31.18.1. Client Verification of Server Certificates
31.18.2. Client Certificates
31.18.3. Protection Provided in Different Modes
31.18.4. SSL Client File Usage
31.18.5. SSL Library Initialization

31.19. Behavior in Threaded Programs

31.20. Building libpq Programs

31.21. Example Programs

libpq is the C application programmer's interface to PostgreSQL. libpq is a set of library functions that allow client programs to pass queries to the PostgreSQL backend server and to receive the results of these queries.

libpq is also the underlying engine for several other PostgreSQL application interfaces, including those written for C++, Perl, Python, Tcl and ECPG. So some aspects of libpq's behavior will be important to you if you use one of those packages. In particular, Section 31.14, Section 31.15 and Section 31.18 describe behavior that is visible to the user of any application that uses libpq.

Some short programs are included at the end of this chapter (Section 31.21) to show how to write programs that use libpq. There are also several complete examples of libpq applications in the directory src/test/examples in the source code distribution.

Client programs that use libpq must include the header file libpq-fe.h and must link with the libpq library.

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