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Chapter 32. libpq - C Library
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Chapter 32. libpq - C Library

Table of Contents

32.1. Database Connection Control Functions

32.1.1. Connection Strings
32.1.2. Parameter Key Words

32.2. Connection Status Functions

32.3. Command Execution Functions

32.3.1. Main Functions
32.3.2. Retrieving Query Result Information
32.3.3. Retrieving Other Result Information
32.3.4. Escaping Strings for Inclusion in SQL Commands

32.4. Asynchronous Command Processing

32.5. Retrieving Query Results Row-By-Row

32.6. Canceling Queries in Progress

32.7. The Fast-Path Interface

32.8. Asynchronous Notification

32.9. Functions Associated with theCOPY Command

32.9.1. Functions for SendingCOPY Data
32.9.2. Functions for ReceivingCOPY Data
32.9.3. Obsolete Functions forCOPY

32.10. Control Functions

32.11. Miscellaneous Functions

32.12. Notice Processing

32.13. Event System

32.13.1. Event Types
32.13.2. Event Callback Procedure
32.13.3. Event Support Functions
32.13.4. Event Example

32.14. Environment Variables

32.15. The Password File

32.16. The Connection Service File

32.17. LDAP Lookup of Connection Parameters

32.18. SSL Support

32.18.1. Client Verification of Server Certificates
32.18.2. Client Certificates
32.18.3. Protection Provided in Different Modes
32.18.4. SSL Client File Usage
32.18.5. SSL Library Initialization

32.19. Behavior in Threaded Programs

32.20. Buildinglibpq Programs

32.21. Example Programs

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

libpq is also the underlying engine for several otherPostgres Pro application interfaces, including those written for C++, Perl, Python, Tcl andECPG. So some aspects oflibpq's behavior will be important to you if you use one of those packages. In particular,Section 32.14,Section 32.15 andSection 32.18 describe behavior that is visible to the user of any application that useslibpq.

Some short programs are included at the end of this chapter (Section 32.21) to show how to write programs that uselibpq.

Client programs that uselibpq must include the header filelibpq-fe.h and must link with thelibpq library.

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