Use this statement to create a new procedure in the database in a manner compatible with Adaptive Server Enterprise.
The following subset of the Transact-SQL CREATE PROCEDURE statement is supported in SQL Anywhere.
CREATE PROCEDURE [owner.]procedure_name
[ NO RESULT SET ]
[ [ ( ] @parameter_name data-type [ = default ] [ OUTPUT ], ... [ ) ] ]
[ WITH RECOMPILE ] AS statement-list
NO RESULT SET clause Declares that no result set is returned by this procedure. This is useful when an external environment needs to know that a procedure does not return a result set.
The following differences between Transact-SQL and SQL Anywhere statements (Watcom-SQL) are listed to help those writing in both dialects.
Variable names prefixed by @ The "@" sign denotes a Transact-SQL variable name, while Watcom-SQL variables can be any valid identifier, and the @ prefix is optional.
Input and output parameters Watcom-SQL procedure parameters are INOUT by default or can specified as IN, OUT, or INOUT. Transact-SQL procedure parameters are INPUT parameters by default or can be specified as OUTPUT. Those parameters that would be declared as INOUT or as OUT in SQL Anywhere should be declared with OUTPUT in Transact-SQL.
Parameter default values Watcom-SQL procedure parameters are given a default value using the keyword DEFAULT, while Transact-SQL uses an equality sign (=) to provide the default value.
Returning result sets Watcom-SQL uses a RESULT clause to specify returned result sets. In Transact-SQL procedures, the column names or alias names of the first query are returned to the calling environment.
The following Transact-SQL procedure illustrates how result sets are returned from Transact-SQL stored procedures:
CREATE PROCEDURE showdept @deptname varchar(30) AS SELECT Employees.Surname, Employees.GivenName FROM Departments, Employees WHERE Departments.DepartmentName = @deptname AND Departments.DepartmentID = Employees.DepartmentID;
The following is the corresponding Watcom-SQL procedure:
CREATE PROCEDURE showdept(in deptname varchar(30) ) RESULT ( lastname char(20), firstname char(20)) ON EXCEPTION RESUME BEGIN SELECT Employees.Surname, Employees.GivenName FROM Departments, Employees WHERE Departments.DepartmentName = deptname AND Departments.DepartmentID = Employees.DepartmentID END;
Procedure body The body of a Transact-SQL procedure is a list of Transact-SQL statements prefixed by the AS keyword. The body of a Watcom-SQL procedure is a compound statement, bracketed by BEGIN and END keywords.
Must have RESOURCE authority.
SQL/2003 Transact-SQL extension.
Sybase SQL Anywhere supports a subset of the Adaptive Server Enterprise CREATE PROCEDURE statement syntax.
If the Transact-SQL WITH RECOMPILE optional clause is supplied, it is ignored. SQL Anywhere always recompiles procedures the first time they are executed after a database is started, and stores the compiled procedure until the database is stopped.
Groups of procedures are not supported.