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ECPG(1) 			  PostgreSQL 9.2.7 Documentation			  ECPG(1)

       ecpg - embedded SQL C preprocessor

       ecpg [option...] file...

       ecpg is the embedded SQL preprocessor for C programs. It converts C programs with embedded
       SQL statements to normal C code by replacing the SQL invocations with special function
       calls. The output files can then be processed with any C compiler tool chain.

       ecpg will convert each input file given on the command line to the corresponding C output
       file. Input files preferably have the extension .pgc, in which case the extension will be
       replaced by .c to determine the output file name. If the extension of the input file is
       not .pgc, then the output file name is computed by appending .c to the full file name. The
       output file name can also be overridden using the -o option.

       This reference page does not describe the embedded SQL language. See Chapter 33, ECPG -
       Embedded SQL in C, in the documentation for more information on that topic.

       ecpg accepts the following command-line arguments:

	   Automatically generate certain C code from SQL code. Currently, this works for EXEC

       -C mode
	   Set a compatibility mode.  mode can be INFORMIX or INFORMIX_SE.

       -D symbol
	   Define a C preprocessor symbol.

	   Parse a header file, this option includes otion -c.

	   Parse system include files as well.

       -I directory
	   Specify an additional include path, used to find files included via EXEC SQL INCLUDE.
	   Defaults are .  (current directory), /usr/local/include, the PostgreSQL include
	   directory which is defined at compile time (default: /usr/local/pgsql/include), and
	   /usr/include, in that order.

       -o filename
	   Specifies that ecpg should write all its output to the given filename.

       -r option
	   Selects run-time behavior.  Option can be one of the following:

	       Do not use indicators but instead use special values to represent null values.
	       Historically there have been databases using this approach.

	       Prepare all statements before using them. Libecpg will keep a cache of prepared
	       statements and reuse a statement if it gets executed again. If the cache runs
	       full, libecpg will free the least used statement.

	       Allow question mark as placeholder for compatibility reasons. This used to be the
	       default long ago.

	   Run in regression testing mode.

	   Turn on autocommit of transactions. In this mode, each SQL command is automatically
	   committed unless it is inside an explicit transaction block. In the default mode,
	   commands are committed only when EXEC SQL COMMIT is issued.

	   Print additional information including the version and the "include" path.

	   Print the ecpg version and exit.

       -?, --help
	   Show help about ecpg command line arguments, and exit.

       When compiling the preprocessed C code files, the compiler needs to be able to find the
       ECPG header files in the PostgreSQL include directory. Therefore, you might have to use
       the -I option when invoking the compiler (e.g., -I/usr/local/pgsql/include).

       Programs using C code with embedded SQL have to be linked against the libecpg library, for
       example using the linker options -L/usr/local/pgsql/lib -lecpg.

       The value of either of these directories that is appropriate for the installation can be
       found out using pg_config(1).

       If you have an embedded SQL C source file named prog1.pgc, you can create an executable
       program using the following sequence of commands:

	   ecpg prog1.pgc
	   cc -I/usr/local/pgsql/include -c prog1.c
	   cc -o prog1 prog1.o -L/usr/local/pgsql/lib -lecpg

PostgreSQL 9.2.7			    2014-02-17					  ECPG(1)
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