PostgreSQL基础整理（二）

存储过程

实现功能：针对工资表30岁以下，工资提升10% 30至40提升20% 40以上提升30% + 奖金（入参）返回平均薪酬

创建表：

DROP TABLE emps;
CREATE TABLE emps(userid int PRIMARY KEY, age int, salary numeric );
INSERT INTO emps VALUES(10, 25, 1000.0),(11, 26, 1500.0),(12, 27, 1300.0),(13, 35, 3000.0), (14, 45, 4000.0);

创建存储过程：

    DROP FUNCTION IF EXISTS add_salary(_bonus numeric );
    CREATE OR REPLACE FUNCTION add_salary(_bonus numeric )
    RETURNS numeric AS $body$
    
    DECLARE
        level1 numeric  := 30;
        level2 numeric  :=40;
        res numeric  := 0;
        page int;
        puserid int;
        mycursor refcursor ;
         
    
        BEGIN
            OPEN mycursor FOR SELECT userid, age FROM emps; 
            FETCH mycursor INTO puserid, page;
            RAISE NOTICE 'age is :----%',puserid||','||page;
            WHILE FOUND LOOP
                IF  page <= level1 
                THEN
                    UPDATE emps SET salary = salary * 1.1 WHERE userid = puserid;
                ELSIF  page > level1 AND page <= level2 
                THEN
                    UPDATE emps SET salary = salary*1.2 WHERE userid = puserid;
                ELSE
                    UPDATE emps SET salary = salary*1.3 WHERE userid = puserid;
                END IF;        
                
                FETCH mycursor INTO puserid, page;
                
            END LOOP;
            
                SELECT AVG(SALARY) FROM emps INTO res;
                RETURN res;
        END
    $body$
    Language plpgsql;