Linux server development, MySQL process control statement

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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;