Stored Procedures and Triggers in .NET

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Stored Procedures and Triggers
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languages are also similar Very little effort is required to port functions created in PL/SQL to PL/pgSQL, and visa versa The function examples in this chapter all use the PL/pgSQL procedural language If you want to run these examples within your PostgreSQL database, you must have opted to install the PL/pgSQL procedural language during the PostgreSQL install If you did not, you can still install it using the normal PostgreSQL installation, this time just select the PL/pgSQL procedural language to install (just remember to uncheck the PostgreSQL database installation, or you will overwrite your existing database structure)
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TYPES OF FUNCTIONS
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There are two types of functions that can be created using procedural languages: Stored procedures Triggers Stored procedures are probably the thing you would normally think of when thinking of creating a new function They behave exactly as do the built-in PostgreSQL functions within common SQL command expressions They appear in the \df meta-command listing of functions, and can be used by other database users in their SQL commands to easily manipulate data within the database tables The benefit of creating stored procedures is that instead of each individual user having to create a lot of SQL commands to perform an action on table data, you can create a specialized stored procedure that performs multiple SQL commands as one function Each user can then execute the stored procedure as a single function within a SQL command When the function executes, the entire block of SQL commands contained in it is processed by the database engine Triggers are functions that are executed directly by the database engine, based on an event that occurs in a table PostgreSQL monitors each action performed on tables (such as inserts, updates, and deletes) If an action is performed on a table that has a trigger linked to it, the database engine automatically performs the trigger function assigned to the trigger Trigger functions are often used to update related data in tables automatically when a table value is inserted or updated in a single table This allows you to maintain data relations automatically, without having to worry about that in your application code
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THE PL/PGSQL LANGUAGE
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The PL/pgSQL procedural language uses standard SQL commands to build programs that can query data from tables, as well as insert, modify, and delete data This makes learning the language easier for database programmers, as they already know how to interface with a database using SQL
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Besides SQL commands, the PL/pgSQL language also uses standard programming statements to define and evaluate variables, accept input values for the function, supply output values from the function, and use control logic, such as conditional loops and IF/THEN statements, to control execution flow within the program The PL/pgSQL language is an interpreted programming language This means that it is not compiled into a binary form, but rather the database engine executes the text program lines one by one as the function is executed That said, there is a catch to the way PostgreSQL handles PL/pgSQL code, and you should be aware of it The first time a PL/pgSQL program is run in the database engine, an execution plan is prepared (see 10) The execution plan is the roadmap PostgreSQL uses to interact with tables, indexes, and result sets Once the execution plan is created for a function, PostgreSQL keeps the plan and uses it every time the function is called (during the lifetime of the PostgreSQL server session) This feature increases performance, as the PL/pgSQL code does not have to be interpreted each time the function is run The downside to this is that you must be careful when making dynamic changes to functions Normally PostgreSQL detects if a function s code has changed, and creates a new execution plan when necessary What it does not know, though, is whether a function calls another function, and whether that function s code has been changed This can often cause problems when working with stored procedures, as the old execution plan for the called function will be used It is up to you to know when this situation may occur The only way to solve the problem is to re-create the original function (even though it has not changed) so that PostgreSQL knows to create a new execution plan, or manually stop and restart the database server session (see the discussion of the pg_ctl program in 3) The following sections describe the PL/pgSQL procedural language and show how to use it to create your own functions for your applications
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