Basic statements: |
BEGIN ... END statement |
Gives the statements defined within the BEGIN and END
keywords the status of a single statement. |
CALL statement |
Invokes a user-written routine that has
been defined using a CREATE FUNCTION or CREATE PROCEDURE statement. |
CASE statement |
Uses rules defined in WHEN clauses to select a block
of statements to execute. |
CREATE FUNCTION statement |
Like CREATE PROCEDURE, CREATE FUNCTION defines a user-written
routine. (The few differences between CREATE FUNCTION and CREATE ROUTINE are
described in the reference material.) |
CREATE MODULE statement |
Creates a module (a named container associated with
a node). |
CREATE PROCEDURE statement |
Like CREATE FUNCTION, CREATE PROCEDURE defines a user-written
routine. (The few differences between CREATE FUNCTION and CREATE ROUTINE are
described in the reference material.) |
DECLARE statement |
Declares one or more variables that can be used to store
temporary values. |
IF statement |
Processes a set of statements based on the result of
evaluating condition expressions. |
ITERATE statement |
Abandons processing the current iteration of the containing
WHILE, REPEAT, LOOP, or BEGIN statement, and might start the next iteration. |
LEAVE statement |
Abandons processing the current iteration of the containing
WHILE, REPEAT, LOOP or BEGIN statement, and stops looping. |
LOOP statement |
Processes a sequence of statements repeatedly and unconditionally. |
REPEAT statement |
Processes a sequence of statements and then evaluates
a condition expression. If the expression evaluates to TRUE,
executes the statements again. |
RETURN statement |
Stops processing the current function or procedure and
passes control back to the caller. |
SET statement |
Evaluates a source expression, and assigns the result
to the target entity. |
THROW statement |
Generates a user exception. |
WHILE statement |
Evaluates a condition expression, and if it is TRUE
executes a sequence of statements. |
Message tree manipulation statements: |
ATTACH statement |
Attaches a portion of a message tree into a new position
in the message hierarchy. |
CREATE statement |
Creates a new message field. |
DELETE statement |
Detaches and destroys a portion of a message tree, allowing
its memory to be reused. |
DETACH statement |
Detaches a portion of a message tree without deleting
it. |
FOR statement |
Iterates through a list (for example, a message array). |
MOVE statement |
Changes the field pointed to by a target reference variable. |
Database update statements: |
DELETE FROM statement |
Deletes rows from a table in an external database based
on a search condition. |
INSERT statement |
Adds a new row to an external database. |
PASSTHRU statement |
Takes a character value and passes it as an SQL statement
to an external database. |
UPDATE statement |
Updates the values of specified rows and columns in
a table in an external database. |
Node interaction statements: |
PROPAGATE statement |
Propagates a message to the downstream nodes within
the message flow. |
Other statements: |
BROKER SCHEMA statement |
This statement is optional and is used in an ESQL file
to explicitly identify the schema that contains the file. |
DECLARE HANDLER statement |
Declares an error handler. |
EVAL statement |
Takes a character value, interprets it as an SQL statement,
and executes it. |
LOG statement |
Writes a record to the event or user trace log. |
RESIGNAL statement |
Re-throws the current exception (if any). This is used
by an error handler, when it cannot handle an exception, to give an error
handler in higher scope the opportunity of handling the exception. |