Глава 33. ECPG - Embedded SQL in C
- Table of Contents
- 33.1. The Concept
- 33.2. Managing Database Connections
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- 33.2.1. Connecting to the Database Server
- 33.2.2. Choosing a Connection
- 33.2.3. Closing a Connection
- 33.3. Running SQL Commands
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- 33.3.1. Executing SQL Statements
- 33.3.2. Using Cursors
- 33.3.3. Managing Transactions
- 33.3.4. Prepared Statements
- 33.4. Using Host Variables
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- 33.4.1. Overview
- 33.4.2. Declare Sections
- 33.4.3. Retrieving Query Results
- 33.4.4. Type Mapping
- 33.4.5. Handling Nonprimitive SQL Data Types
- 33.4.6. Indicators
- 33.5. Dynamic SQL
- 33.6. pgtypes Library
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- 33.6.1. The numeric Type
- 33.6.2. The date Type
- 33.6.3. The timestamp Type
- 33.6.4. The interval Type
- 33.6.5. The decimal Type
- 33.6.6. errno Values of pgtypeslib
- 33.6.7. Special Constants of pgtypeslib
- 33.7. Using Descriptor Areas
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- 33.7.1. Named SQL Descriptor Areas
- 33.7.2. SQLDA Descriptor Areas
- 33.8. Error Handling
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- 33.8.1. Setting Callbacks
- 33.8.2. sqlca
- 33.8.3. SQLSTATE vs. SQLCODE
- 33.9. Preprocessor Directives
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- 33.9.1. Including Files
- 33.9.2. The define and undef Directives
- 33.9.3. ifdef, ifndef, else, elif, and endif Directives
- 33.10. Processing Embedded SQL Programs
- 33.11. Library Functions
- 33.12. Large Objects
- 33.13. C++ Applications
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- 33.13.1. Scope for Host Variables
- 33.13.2. C++ Application Development with External C Module
- 33.14. Embedded SQL Commands
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- ALLOCATE DESCRIPTOR -- allocate an SQL descriptor area
- CONNECT -- establish a database connection
- DEALLOCATE DESCRIPTOR -- deallocate an SQL descriptor area
- DECLARE -- define a cursor
- DESCRIBE -- obtain information about a prepared statement or result set
- DISCONNECT -- terminate a database connection
- EXECUTE IMMEDIATE -- dynamically prepare and execute a statement
- GET DESCRIPTOR -- get information from an SQL descriptor area
- OPEN -- open a dynamic cursor
- PREPARE -- prepare a statement for execution
- SET AUTOCOMMIT -- set the autocommit behavior of the current session
- SET CONNECTION -- select a database connection
- SET DESCRIPTOR -- set information in an SQL descriptor area
- TYPE -- define a new data type
- VAR -- define a variable
- WHENEVER -- specify the action to be taken when an SQL statement causes a specific class condition to be raised
- 33.15. Informix Compatibility Mode
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- 33.15.1. Additional Types
- 33.15.2. Additional/Missing Embedded SQL Statements
- 33.15.3. Informix-compatible SQLDA Descriptor Areas
- 33.15.4. Additional Functions
- 33.15.5. Additional Constants
- 33.16. Internals
This chapter describes the embedded SQL package for PostgreSQL. It was written by Linus Tolke
(<linus@epact.se>) and
Michael Meskes (<meskes@postgresql.org>).
Originally it was written to work with C. It also works with C++, but it does not recognize all
C++ constructs yet.
This documentation is quite incomplete. But since this interface is standardized, additional information can be found in many resources about SQL.