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Linux server development, MySQL process control statement
2022-07-07 07:50:00 【Tuen Mun pheasant calls me chicken】
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1.IF sentence
IF condition(x=1) THEN
(SELECT 1;)
ELSEIF condition(x=2) THEN
(SELECT 2;)
ELSE
(SELECT 3;)
END IF;
2.CASE sentence
CASE valu(x)
WHEN value(1) TNEN SELECT 1;
WHEN value(2) TNEN SELECT 2;
ELSE …
END CASE;
3.WHILE sentence
lable:WHILE i<100 DO
SET s=s+i;
SET i=i+1;
IF i=50 THEN
– sign out while loop
LEAVE lable
END IF;
END WHILE;
4.LOOP sentence
loop_label:LOOP
SET s=s+1;
SET i=i+1;
IF i>100 THEN
– Introduction LOOP loop
LEAVE loop_label;
END IF;
END LOOP;
5.REPEAT sentence
REPEAT
SET s=s+i;
SET i=i+1;
UNTIL i>100
END REPEAT;
5.ITERATE sentence
IF(i mod 2) THEN
SET s=s+1;
ELSE
– Exit this cycle , Go on to the next cycle
ITERATE loop_bale;
END IF;
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