EXECUTE IMMEDIATE
EXECUTE IMMEDIATE
EXECUTE IMMEDIATE - dynamically prepare and execute a statement
Synopsis
EXECUTE IMMEDIATE string
Description
EXECUTE IMMEDIATE
immediately prepares and
executes a dynamically specified SQL statement, without
retrieving result rows.
Parameters
-
string -
A literal string or a host variable containing the SQL statement to be executed.
Notes
In typical usage, the
string
is a host
variable reference to a string containing a dynamically-constructed
SQL statement. The case of a literal string is not very useful;
you might as well just write the SQL statement directly, without
the extra typing of
EXECUTE IMMEDIATE
.
If you do use a literal string, keep in mind that any double quotes
you might wish to include in the SQL statement must be written as
octal escapes (
\042
) not the usual C
idiom
\"
. This is because the string is inside
an
EXEC SQL
section, so the ECPG lexer parses it
according to SQL rules not C rules. Any embedded backslashes will
later be handled according to C rules; but
\"
causes an immediate syntax error because it is seen as ending the
literal.
Examples
Here is an example that executes an
INSERT
statement using
EXECUTE IMMEDIATE
and a host
variable named
command
:
sprintf(command, "INSERT INTO test (name, amount, letter) VALUES ('db: ''r1''', 1, 'f')");
EXEC SQL EXECUTE IMMEDIATE :command;
Compatibility
EXECUTE IMMEDIATE
is specified in the SQL standard.