Third, enter the above code int the query tool and click the Execute button to create the get_film_count function. Second, open the query tool by selecting Tools > Query Tool. To execute the create function statement, you can use any PostgreSQL client tool including psql and pgAdmin 1) Creating a function using pgAdminįirst, launch the pgAdmin tool and connect to the dvdrental sample database. At the end of the block, use the return statement to return the film_count. In the body of the block, use the select into statement to select the number of films whose length are between len_from and len_to and assign the result to the film_count variable.In the declaration section, declare a variable called film_count that stores the number of films selected from the film table.Between these $$, you can place a block that contains the declaration and logic of the function. Use the dollar-quoted string constant syntax that starts with $$ and ends with $$.Finally, the language of the function is plpgsql indicated by the language plpgsql.Third, the get_film_count function returns an integer specified by the returns int clause.The View dialog organizes the development of a View through the following dialog tabs. Second, the get_film_count() function accepts two parameters len_from and len_to with the integer datatype. pgAdmin - PostgreSQL Tools for Windows, Mac, Linux and the Web.First, the name of the function is get_film_count that follows the create function keywords.The function get_film_count has two main sections: header and body. $$ Code language: PostgreSQL SQL dialect and PL/pgSQL ( pgsql ) Where length between len_from and len_to The following statement creates a function that counts the films whose length between the len_from and len_to parameters:Ĭreate function get_film_count(len_from int, len_to int) We’ll use the film table from the dvdrental sample database. PostgreSQL Create Function statement examples Once the logs load, a new window will appear, showing the logger and the specific log messages. This will take quite a few minutes to load, so do not click on the screen as to avoid the pgAdmin tool from stalling. Right-click on 'logentries' and choose 'View All Rows'. Finally, place a block in the dollar-quoted string constant. Expand 'Schemas', then 'Public', then 'Tables'.
Note that PostgreSQL supports many procedural languages, not just plpgsql.
Then, specify the function parameter list surrounded by parentheses after the function name.If you want to replace the existing function, you can use the or replace keywords. First, specify the name of the function after the create function keywords.$$ declare - variable declaration begin - logic end
' || v_curr.Create function function_name(param_list) obj_type = 'm ' then 'MATERIALIZED VIEW ' Select p_view_schema, p_view_name, 'CREATE MATERIALIZED VIEW ' || v_curr. Select p_view_schema, p_view_name, 'CREATE VIEW ' || v_curr. ' || table_name || ' TO ' || granteeįrom information_schema. Select p_view_schema, p_view_name, 'GRANT ' || privilege_type || ' ON ' || table_schema || '. Select p_view_schema, p_view_name, 'COMMENT ON COLUMN ' || n. Select p_view_schema, p_view_name, 'COMMENT ON ' || Insert into deps_saved_ddl(deps_view_schema, deps_view_name, deps_ddl_to_run) Select obj_schema, obj_name, obj_type, depth Select dep_schema:: varchar, dep_name:: varchar, dep_type:: varchar, recursive_deps. Select p_view_schema, p_view_name, null:: varchar, 0 With recursive recursive_deps(obj_schema, obj_name, obj_type, depth) as about the CREATE FUNCTION command, see the PostgreSQL core documentation available at. Select obj_schema, obj_name, obj_type from Use the Name field to add a descriptive name for the function. Create or replace function deps_save_and_drop_dependencies(p_view_schema varchar, p_view_name varchar) returns void as