MYSQL流程控制

一：条件控制语句

            (1):if条件语句：           

 if search_condition then statement_list

                        [elseif search_condition then statement_list].....

                        [else search_condition]

              endif

             (2):case条件语句          

 case case_value

                        when when_value then statement_list

                        [when when_value then statement_list]...

                        [else statement_list]

                end case;

二:  循环控制语句

           (1):loop语句               

 [begin_labe:]loop

                    statement_list

                end loop [end_lable]

            begin_lable 和end_lable参数分别表示循环开始和循环结束的标志。若想提前结束可以用leave loop;

            (2):while语句              

[begin_label:]while search_condition do

                        statement_list

                end while[end_label]

            (3):repeat语句               

[begin_label:]repeat search_codition do

                        statement_list

                end repeat [end_lable]