数据库存储过程的实际应用

Posted 2020-10-25 口头猿

在django项目中，使用存储过程步骤：

①新建文件： xxx.sh

②在xxx.sh文件内写存储过程（加粗的是强调而已）：

delimiter //                                                                                                                                                                       
drop procedure if exists upload_combo_complete;                                                                                                                                    
CREATE PROCEDURE  upload_combo_complete (uid INT,combo VARCHAR(100))                                                                                                             

BEGIN                                                                                                                                                                              
DECLARE t_error INTEGER DEFAULT 0;                                                                                                                                               
DECLARE tmpcount INTEGER DEFAULT 0;                                                                                                                                               
DECLARE CONTINUE HANDLER FOR SQLEXCEPTION SET t_error=1;                                                                                                                         
START TRANSACTION;                                           
select count into tmpcount from combocomplete where code = combo;
IF (tmpcount > 0) THEN
    IF uid = -1 THEN 
        update combocomplete set count = tmpcount+1 where code = combo;
    ELSE
        insert into combouidcomplete (uid,code,time) values(uid,combo,UNIX_TIMESTAMP(NOW()));
        update combocomplete set count = tmpcount+1 where code = combo;
    END IF;
ELSE 
    IF uid = -1 THEN 
        insert into combocomplete (code,count) values(combo,1);
    ELSE
        insert into combouidcomplete (uid,code,time) values(uid,combo,UNIX_TIMESTAMP(NOW()));
        insert into combocomplete (code,count) values(combo,1);
    END IF;
END IF;
                                                                                                      
IF t_error = 1 THEN                                                                                                                                                              
    ROLLBACK;                                                                                                                                                                  
ELSE                                                                                                                                                                             
    COMMIT;                                                                                                                                                                        
END IF;                                                                                                                                                                          
END //                                                                                                                                                                           

delimiter ; 

③ 在方法中调用存储过程：

def upload_complete_status(uid,app,SPORTPLANDB,combolist):
    for item in combolist:
        sql="call upload_combo_complete(%d,‘%s‘)"%(uid,item)
        try:
            mysql.callproc(sql=sql,db=SPORTPLANDB)
            return 0
        except Exception,e:
            logutils.info(‘info‘,‘m:upload_complete_status,Exception is %s‘%(e))                                                                                 
            return -20003


补充：方法中的 MYSQL.callproc 定义如下：
@classmethod

def callproc(cls, sql, params=None, db=GeneralConf.SDB):
    try:
        cursor = connections[db].cursor()
        cursor.execute(sql, params)
    finally:
        cursor.close()