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>Chapter 32. <SPAN
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>ECPG</SPAN
> - Embedded <ACRONYM
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>SQL</ACRONYM
> in C</TD
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>32.4. Running SQL Commands</A
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><P
>   Any SQL command can be run from within an embedded SQL application.
   Below are some examples of how to do that.
  </P
><P
>   Creating a table:
</P><PRE
CLASS="PROGRAMLISTING"
>EXEC SQL CREATE TABLE foo (number integer, ascii char(16));
EXEC SQL CREATE UNIQUE INDEX num1 ON foo(number);
EXEC SQL COMMIT;</PRE
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  </P
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>   Inserting rows:
</P><PRE
CLASS="PROGRAMLISTING"
>EXEC SQL INSERT INTO foo (number, ascii) VALUES (9999, 'doodad');
EXEC SQL COMMIT;</PRE
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  </P
><P
>   Deleting rows:
</P><PRE
CLASS="PROGRAMLISTING"
>EXEC SQL DELETE FROM foo WHERE number = 9999;
EXEC SQL COMMIT;</PRE
><P>
  </P
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>   Single-row select:
</P><PRE
CLASS="PROGRAMLISTING"
>EXEC SQL SELECT foo INTO :FooBar FROM table1 WHERE ascii = 'doodad';</PRE
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  </P
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>   Select using cursors:
</P><PRE
CLASS="PROGRAMLISTING"
>EXEC SQL DECLARE foo_bar CURSOR FOR
    SELECT number, ascii FROM foo
    ORDER BY ascii;
EXEC SQL OPEN foo_bar;
EXEC SQL FETCH foo_bar INTO :FooBar, DooDad;
...
EXEC SQL CLOSE foo_bar;
EXEC SQL COMMIT;</PRE
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  </P
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>   Updates:
</P><PRE
CLASS="PROGRAMLISTING"
>EXEC SQL UPDATE foo
    SET ascii = 'foobar'
    WHERE number = 9999;
EXEC SQL COMMIT;</PRE
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>   The tokens of the form
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> are
   <I
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>, that is, they refer to
   variables in the C program.  They are explained in <A
HREF="ecpg-variables.html"
>Section 32.6</A
>.
  </P
><P
>   In the default mode, statements are committed only when
   <TT
CLASS="COMMAND"
>EXEC SQL COMMIT</TT
> is issued. The embedded SQL
   interface also supports autocommit of transactions (similar to
   <SPAN
CLASS="APPLICATION"
>libpq</SPAN
> behavior) via the <TT
CLASS="OPTION"
>-t</TT
> command-line
   option to <TT
CLASS="COMMAND"
>ecpg</TT
> (see below) or via the <TT
CLASS="LITERAL"
>EXEC SQL
   SET AUTOCOMMIT TO ON</TT
> statement. In autocommit mode, each
   command is automatically committed unless it is inside an explicit
   transaction block. This mode can be explicitly turned off using
   <TT
CLASS="LITERAL"
>EXEC SQL SET AUTOCOMMIT TO OFF</TT
>.
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