![]() ![]() The following table summarizes the differences between stored procedures in SQL Server and PostgreSQL. In the preceding example, you can put the set-return function on the outside of the nested loop join because it has no actual lateral dependency on emps table. PostgreSQL version 10 and higher SELECT id, g FROM emps, LATERAL generate_series(1,5) AS g SELECT x, generate_series(1,5) AS g FROM tab PostgreSQL version 9.6 and lower CREATE TABLE emps (id int, manager int) There is a new behavior in PostgreSQL version 10 for a set-returning function, used by LATERAL FROM clause. SELECT EMPLOYEE_ID,FIRST_NAME, EMP_PERIOD_OF_SERVICE_YEAR(EMPLOYEE_ID) AS V_PERIOD_OF_SERVICE_YEARS DOUBLE PRECISION ĮXTRACT (YEAR FROM NOW()) - EXTRACT (YEAR FROM (HIRE_DATE)) CREATE OR REPLACE FUNCTION EMP_PERIOD_OF_SERVICE_YEAR (IN P_EMP_ID DOUBLE PRECISION) The following example creates a function with PostgreSQL PL/pgSQL. In the preceding example, you can replace the RAISE command with RETURN to inform the application that an error occurred. RAISE USING ERRCODE := '20001', MESSAGE := CONCAT_WS('', 'AN ERROR WAS ENCOUNTERED -', SQLSTATE, ' -ERROR-', SQLERRM) RAISE DEBUG USING MESSAGE := CONCAT_WS('', 'NEW SALARY FOR EMPLOYEE ID: ', P_EMP_ID, ' UPDATE EMPLOYEES SET SALARY = V_EMP_CURRENT_SAL + SAL_RAISE WHERE EMPLOYEE_ID = P_EMP_ID ![]() SELECT SALARY INTO STRICT V_EMP_CURRENT_SALįROM EMPLOYEES WHERE EMPLOYEE_ID = P_EMP_ID (IN P_EMP_ID DOUBLE PRECISION, IN SAL_RAISE DOUBLE PRECISION) Use the LANGUAGE PLPGSQL parameter to specify the language for the created function. The double dollar sign appears after the keyword AS and after the function keyword END. With the double dollar sign, there is no need to use escape characters in the code when using single quotation marks. ![]() The double dollar signs alleviate the need to use single-quoted string escape elements. The P_NUM INPUT parameter is implemented similar to SQL Server T-SQL INPUT parameter. The user must own the function to replace it. The statement doesn’t allow changing the existing function return type. You can’t change the function name or argument types. PostgreSQL supports these additional programming languages, also available in Amazon Aurora PostgreSQL: PL/pgSQL is the main database programming language used for migrating from SQL Server T-SQL code. The CREATE PROCEDURE statement isn’t supported. To emphasize, only the CREATE FUNCTION is supported by the procedural statements used by PostgreSQL version 10. PostgreSQL version 10 provides support for both stored procedures and stored functions using the CREATE FUNCTION statement. INSERT INTO (,, )ģ M8 Washer 200 INSERT… EXEC Syntax INSERT INTO įor more information, see CREATE PROCEDURE (Transact-SQL) in the SQL Server documentation. INSERT INTO OrderItems(OrderID, Item, Quantity)įROM following example populates the table-valued variable and passes the data set to the stored procedure. The following example creates a procedure to process order items. ![]() The following example creates a table-valued type for the OrderItem table-valued parameter. ) INSERT INTO OrderItems (OrderID, Item, Quantity) The following example creates and populates an OrderItems table. The following example creates a stored procedure that uses RETURN to pass an error value to the application. SELECT Returns 1 EXECUTE = 'Xy.com', = OUT RETURN following example runs this stored procedure. CREATE PROCEDURE VARCHAR(128), BIT = 0 OUT The following example creates a simple parameterized stored procedure to validate the basic format of an email. When using this feature, only the first row in the data set returned by the stored procedure is evaluated. SQL Server provides a unique feature that allows you to use a stored procedure as an input to an INSERT statement. You can encrypt them in the database using the ENCRYPTION option to prevent unauthorized access to the source code. You can explicitly recompile them for every run using the RECOMPILE option. SQL Server allows you to run stored procedures in any security context using the EXECUTE AS option. You can specify parameters as both IN and OUT. IN is the default direction for parameters, but OUT must be explicitly specified. Table-valued user-defined types can be used as input parameters. They may have multiple input ( IN) and output ( OUT) parameters. Stored procedures are encapsulated, persisted code modules that you can run using the EXECUTE T-SQL statement. ![]()
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