Anonymous Block¶
An anonymous block applies to a script infrequently executed or a one-off activity. An anonymous block is executed in a session and is not stored.
Syntax¶
Figure 1 shows the syntax diagrams for an anonymous block.
Figure 1 anonymous_block::=¶
Details about the syntax diagram are as follows:
The execute part of an anonymous block starts with a BEGIN statement, has a break with an END statement, and ends with a semicolon (;). Type a slash (/) and press Enter to execute the statement.
Important
The terminator "/" must be written in an independent row.
The declaration section includes the variable definition, type, and cursor definition.
A simplest anonymous block does not execute any commands. At least one statement, even a null statement, must be presented in any implementation blocks.
Examples¶
The following lists basic anonymous block programs:
-- Null statement block:
BEGIN
NULL;
END;
/
-- Print information to the console:
BEGIN
dbms_output.put_line('hello world!');
END;
/
-- Print variable contents to the console:
DECLARE
my_var VARCHAR2(30);
BEGIN
my_var :='world';
dbms_output.put_line('hello'||my_var);
END;
/