EXECUTE IMMEDIATE — dynamically prepare and execute a statement
EXECUTE IMMEDIATE immediately prepares and executes a dynamically specified SQL statement, without retrieving result rows.
A literal string or a host variable containing the SQL statement to be executed.
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
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.
Here is an example that executes an
INSERT statement using
EXECUTE IMMEDIATE and a host variable named
sprintf(command, "INSERT INTO test (name, amount, letter) VALUES ('db: ''r1''', 1, 'f')"); EXEC SQL EXECUTE IMMEDIATE :command;
EXECUTE IMMEDIATE is specified in the SQL standard.