Creating a PL/pgSQL Function in Visual Studio .NET

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Creating a PL/pgSQL Function
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To create a new function, you must use the CREATE FUNCTION command If you need to modify an existing function, you have two options One method is to use the CREATE OR REPLACE FUNCTION command to redefine the program code for an existing function You can not, however, change any input or output variables or data types when using this method This only works for modifying the function code within the function The other way to modify an existing function is to use the DROP FUNCTION command to completely remove the function from the database You can then use CREATE FUNCTION to build a new function with the same name and modify whatever you need to change It is important to remember, though, that the new function is a new database object Any objects referencing the original function by its object ID (OID) must be changed to point to the new function, even if the function name stays the same The basic format of the CREATE FUNCTION command is
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CREATE [ OR REPLACE ] FUNCTION functionname ( [ [argmode] [argname] argtype [,] ) [RETURNS returntype] AS $$
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DECLARE <variable declarations> BEGIN <code section> END; $$ LANGUAGE languagename [ IMMUTABLE | STABLE | VOLATILE | CALLED ON NULL INPUT| RETURNS NULL ON NULL INPUT | STRICT | SECURITY INVOKER | SECURITY DEFINER ]
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The languagename parameter defines the procedural language used to create the function For functions created using PL/pgSQL, this value is plpgsql The first line of the function declares the functionname parameter, which defines the unique name used to identify the function By default, the function will be created in the public schema If you need to create the function for a different schema, you must specify a schema name along with the function name You can define for the function both input and output arguments that are used to pass input and output variables between the function and the SQL code that uses the function There are three components used to define a function argument:
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argmode argname argtype
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The argmode value defines the direction of the argument, IN for input variables, OUT for variables returned by the function, or INOUT for variables that can be used for both The argname value defines the name of the variable In PL/pgSQL this variable name can be used within the program code of the function The argtype value defines the data type of the argument You may define as many input and output variables as you need (each separated by a comma) For compatibility with previous versions of PostgreSQL, PostgreSQL 8 also supports defining a single output variable using the RETURNS keyword in the command The returntype parameter defines only the data type of the returned output variable The last line of code in the function must be a RETURN statement This statement specifies which variable is used to return a value to the calling program The AS section defines the program code used in the function Since PL/pgSQL is an interpreted language, all of the lines of program code must be in text format The double dollar signs ($$) signify the start and end of the function code text PostgreSQL interprets the function code as a single literal text string If you remember from 6, literal text strings are normally enclosed with single quotes, and that is certainly permissible in this case as well However, when creating a function, this could be a problem, as you often need to use single quotes to define other literal strings used within the function Working with literal strings embedded within literal strings can quickly become confusing, as quotes for embedded literal strings must be identified with multiple single quotes PostgreSQL has provided the double dollar sign since version 73 as an alternative method for signifying literal strings This allows the programmer to use the double
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