Anonymous Blocks

Syntax

Figure 1 shows the syntax diagrams for an anonymous block.

Figure 1 anonymous_block::=

Details about the syntax diagram are as follows:

• The execution section 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.
  

  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. However, at least one statement, even a NULL statement, must be presented in any implementation blocks.

Examples

The following lists basic anonymous block programs:

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-- Null statement block
openGauss=# BEGIN
     NULL; 
END;
/

-- Display information on the console.
openGauss=# BEGIN
     dbe_output.print_line('hello world!'); 
END; 
/

-- Display variable content on the console.
openGauss=# DECLARE      
     my_var VARCHAR2(30);  
BEGIN      
     my_var :='world';     
     dbe_output.print_line('hello'||my_var); 
END; 
/