杞?嚜锛?a target="_blank" href="http://blog.sina.com.cn/s/blog_4f925fc30100mw2l.html" title="鐐瑰嚮鏌ョ湅鍘熸枃">http://blog.sina.com.cn/s/blog_4f925fc30100mw2l.html
聽
聽 聽 鍦∕ySQL瀛樺偍杩囩▼鐨勮?鍙ヤ腑鏈変笁涓?爣鍑嗙殑寰?幆鏂瑰紡锛歐HILE寰?幆锛孡OOP寰?幆浠ュ強REPEAT寰?幆銆傝繕鏈変竴绉嶉潪鏍囧噯鐨勫惊鐜?柟寮忥細GOTO锛屼笉杩囪繖绉嶅惊鐜?柟寮忔渶濂藉埆鐢?紝寰堝?鏄撳紩璧风▼搴忕殑娣蜂贡锛屽湪杩欓噷灏变笉閿欏叿浣撲粙缁嶄簡銆?/p>
杩欏嚑涓?惊鐜??鍙ョ殑鏍煎紡濡備笅锛?br>WHILE鈥︹??O鈥︹??ND WHILE
REPEAT鈥︹??NTIL END REPEAT
LOOP鈥︹??ND LOOP
GOTO銆?/p>
| 聽 |
聽
聽聽聽聽涓嬮潰棣栧厛浣跨敤绗?竴绉嶅惊鐜?紪鍐欎竴涓?緥瀛愩??br>mysql> create procedure pro10()
聽聽聽聽-> begin
聽聽聽聽-> declare i int;
聽聽聽聽-> set i=0;
聽聽聽聽-> while i<5 do
聽聽聽聽->聽聽聽聽聽insert into t1(filed) values(i);
聽聽聽聽->聽聽聽聽聽set i=i+1;
聽聽聽聽-> end while;
聽聽聽聽-> end;//
Query OK, 0 rows affected (0.00 sec)
聽聽聽聽鍦ㄨ繖涓?緥瀛愪腑锛孖NSERT鍜孲ET璇?彞鍦╓HILE鍜孍ND WHILE涔嬮棿锛屽綋鍙橀噺i澶т簬绛変簬5鐨勬椂鍊欏氨閫?鍑哄惊鐜??備娇鐢╯et i=0锛涜?鍙ユ槸涓轰簡闃叉?涓?涓?父瑙佺殑閿欒?锛屽?鏋滄病鏈夊垵濮嬪寲锛宨榛樿?鍙橀噺鍊间负NULL锛岃?孨ULL鍜屼换浣曞?兼搷浣滅殑缁撴灉閮芥槸NULL銆?br>聽聽聽聽鎵ц?涓?涓嬭繖涓?瓨鍌ㄨ繃绋嬪苟浜х湅涓?涓嬫墽琛岀粨鏋滐細
mysql> delete from t1//
Query OK, 0 rows affected (0.00 sec)
mysql> call pro10()//
Query OK, 1 row affected (0.00 sec)
mysql> select * from t1//
+鈥斺??+
| filed |
+鈥斺??+
|聽聽聽聽聽0 |
|聽聽聽聽聽1 |
|聽聽聽聽聽2 |
|聽聽聽聽聽3 |
|聽聽聽聽聽4 |
+鈥斺??+
5 rows in set (0.00 sec)
聽聽聽聽浠ヤ笂灏辨槸鎵ц?缁撴灉锛屾湁5琛屾暟鎹?彃鍏ュ埌鏁版嵁搴撲腑锛岃瘉鏄庡瓨鍌ㄨ繃绋嬬紪鍐欐?纭?棤璇痎_^銆?/p>
聽聽聽聽鍐嶆潵鐪嬩竴涓嬬?浜屼釜寰?幆鎺у埗鎸囦护 REPEAT鈥︹??ND REPEAT銆備娇鐢≧EPEAT寰?幆鎺у埗璇?彞缂栧啓涓嬮潰杩欎釜瀛樺偍杩囩▼锛?br>mysql> create procedure pro11()
聽聽聽聽-> begin
聽聽聽聽-> declare i int default 0;
聽聽聽聽-> repeat
聽聽聽聽->聽聽聽聽聽insert into t1(filed) values(i);
聽聽聽聽->聽聽聽聽聽set i=i+1;
聽聽聽聽->聽聽聽聽聽until i>=5
聽聽聽聽-> end repeat;
聽聽聽聽-> end;//
Query OK, 0 rows affected (0.00 sec)
聽聽聽聽杩欎釜REPEAT寰?幆鐨勫姛鑳藉拰鍓嶉潰WHILE寰?幆涓?鏍凤紝鍖哄埆鍦ㄤ簬瀹冪殑鎵ц?鍚庢?鏌ユ槸鍚︽弧瓒冲惊鐜?潯浠讹紙until i>=5锛夛紝鑰學HILE鍒欐槸鎵ц?鍓嶆?鏌ワ紙while i<5 do锛夈??br>聽聽聽聽涓嶈繃瑕佹敞鎰弖ntil i>=5鍚庨潰涓嶈?鍔犲垎鍙凤紝濡傛灉鍔犲垎鍙凤紝灏辨槸鎻愮ず璇?硶閿欒?銆?br>聽聽聽聽缂栧啓瀹屾垚鍚庯紝璋冪敤涓?涓嬭繖涓?瓨鍌ㄨ繃绋嬶紝骞舵煡鐪嬬粨鏋滐細
mysql> delete from t1//
Query OK, 5 rows affected (0.00 sec)
mysql> call pro11()//
Query OK, 1 row affected (0.00 sec) #铏界劧鍦ㄨ繖閲屾樉绀哄彧鏈変竴琛屾暟鎹?彈鍒板奖鍝嶏紝浣嗘槸涓嬮潰閫夋嫨鏁版嵁鐨勮瘽锛岃繕鏄?彃鍏ヤ簡5琛屾暟鎹???/p>
mysql> select * from t1//
+鈥斺??+
| filed |
+鈥斺??+
|聽聽聽聽聽0 |
|聽聽聽聽聽1 |
|聽聽聽聽聽2 |
|聽聽聽聽聽3 |
|聽聽聽聽聽4 |
+鈥斺??+
5 rows in set (0.00 sec)
涓?琛屽氨鏄?墽琛岀粨鏋滐紝瀹為檯鐨勪綔鐢ㄥ拰浣跨敤while缂栧啓鐨勫瓨鍌ㄨ繃绋嬩竴鏍凤紝閮芥槸鎻掑叆5琛屾暟鎹???/p>
鍐嶆潵鐪嬩竴涓嬬?涓変釜寰?幆鎺у埗璇?彞LOOP鈥︹??ND LOOP銆傜紪鍐欎竴涓?瓨鍌ㄨ繃绋嬬▼搴忓?涓嬶細
mysql> create procedure pro12()
聽聽聽聽-> begin
聽聽聽聽-> declare i int default 0;
聽聽聽聽-> loop_label: loop
| 聽 |
聽聽聽聽->聽聽聽聽聽insert into t1(filed) values(i);
聽聽聽聽->聽聽聽聽聽set i=i+1;
聽聽聽聽->聽聽聽聽聽if i>=5 then
聽聽聽聽->聽聽聽聽聽聽聽聽聽leave loop_label;
聽聽聽聽->聽聽聽聽聽end if;
聽聽聽聽-> end loop;
聽聽聽聽-> end;//
Query OK, 0 rows affected (0.00 sec)
浠庝笂闈㈣繖涓?緥瀛愬彲浠ョ湅鍑猴紝浣跨敤LOOP缂栧啓鍚屾牱鐨勫惊鐜?帶鍒惰?鍙ヨ?姣斾娇鐢╳hile鍜宺epeat缂栧啓鐨勮?澶嶆潅涓?浜涳細鍦ㄥ惊鐜?唴閮ㄥ姞鍏ヤ簡IF鈥︹??ND IF璇?彞锛屽湪IF璇?彞涓?張鍔犲叆浜哃EAVE璇?彞锛孡EAVE璇?彞鐨勬剰鎬濇槸绂诲紑寰?幆锛孡EAVE鐨勬牸寮忔槸锛歀EAVE 寰?幆鏍囧彿銆?br>聽聽聽聽缂栧啓瀹屽瓨鍌ㄨ繃绋嬬▼搴忓悗锛屾潵鎵ц?骞舵煡鐪嬩竴涓嬭繍琛岀粨鏋滐細
mysql> delete from t1//
Query OK, 5 rows affected (0.00 sec)
聽
mysql> call pro12//
Query OK, 1 row affected (0.00 sec) #铏界劧璇村彧鏈変竴琛屾暟鎹?彈褰卞搷锛屼絾鏄?疄闄呬笂鏄?彃鍏ヤ簡5琛屾暟鎹???/p>
mysql> select * from t1//
+鈥斺??+
| filed |
+鈥斺??+
|聽聽聽聽聽0 |
|聽聽聽聽聽1 |
|聽聽聽聽聽2 |
|聽聽聽聽聽3 |
|聽聽聽聽聽4 |
+鈥斺??+
5 rows in set (0.00 sec)
聽聽聽聽鎵ц?缁撴灉鍜屼娇鐢╓HILE銆丩OOP缂栧啓鐨勫惊鐜?竴鏍凤紝閮芥槸寰?鏍囦腑鎻掑叆5琛屽?笺??/p>
聽聽聽Labels聽聽聽鏍囧彿鍜?END Labels 缁撴潫鏍囧彿
聽聽聽鍦ㄤ娇鐢╨oop鐨勬椂鍊欙紝浣跨敤鍒扮殑labels鏍囧彿锛屽?浜巐abels鍙?互鐢ㄥ埌while锛宭oop锛宺repeat绛夊惊鐜?帶鍒惰?鍙ヤ腑銆傝?屼笖鏈夊繀瑕佸ソ濂借?璇嗕竴涓媗ables!锛?br>mysql> create procedure pro13()
聽聽聽聽-> label_1:begin
聽聽聽聽-> label_2:while 0=1 do leave label_2;end while;
聽聽聽聽-> label_3:repeat leave label_3;until 0=0 end repeat;
聽聽聽聽-> label_4:loop leave label_4;end loop;
聽聽聽聽-> end;//
Query OK, 0 rows affected (0.00 sec)
聽聽聽聽涓婇潰杩欓噷渚嬪瓙鏄剧ず浜嗗彲浠ュ湪BEGIN銆乄HILE銆丷EPEAT鎴栬?匧OOP璇?彞鍓嶄娇鐢ㄨ?鍙ユ爣鍙凤紝璇?彞鏍囧彿 鍙?兘鍦ㄥ悎娉曠殑璇?彞鍓嶄娇鐢?紝鎵?浠?EAVE label_3鎰忓懗鐫?绂诲紑璇?彞鏍囧彿鍚嶄负label_3鐨勮?鍙ユ垨绗﹀悎璇?彞銆?br>聽聽聽聽鍏跺疄锛屼篃鍙?互浣跨敤END labels鏉ヨ〃绀烘爣鍙风粨鏉熺?銆?br>mysql> create procedure pro14()
聽聽聽聽-> label_1:begin
聽聽聽聽-> label_2:while 0=1 do leave label_2;end while label_2;
聽聽聽聽-> label_3:repeat leave label_3;until 0=0 end repeat label_3;
聽聽聽聽-> label_4:loop leave label_4;end loop label_4;
聽聽聽聽-> end label_1;//
Query OK, 0 rows affected (0.00 sec)
聽聽聽聽涓婇潰灏辨槸浣跨敤浜嗘爣鍙风粨鏉熺?锛屽叾瀹炶繖涓?粨鏉熸爣鍙峰苟涓嶆槸鍗佸垎鏈夌敤锛岃?屼笖浠栧繀椤诲拰寮?濮嬪畾涔夌殑鏍囧彿鍚嶅瓧涓?鏍凤紝鍚﹀垯灏变細鎶ラ敊銆傚?鏋滆?鍏绘垚涓?涓?壇濂界殑缂栫▼涔犳儻鏂逛究浠栦汉闃呰?鐨勮瘽锛屽彲浠ヤ娇鐢ㄨ繖涓?爣鍙风粨鏉熺?銆?/p>
ITERATE 杩?唬聽聽聽聽聽聽聽聽
聽聽聽聽聽濡傛灉鏄?湪ITERATE璇?彞锛屽嵆杩?唬璇?彞涓?殑璇濓紝灏卞繀椤讳娇鐢↙EAVE璇?彞銆侷TERATE鍙?兘鍑虹幇鍦↙OOP锛孯EPEAT鍜學HILE璇?彞涓?紝瀹冪殑鎰忔?濇槸鈥滃啀娆″惊鐜??濓紝渚嬪?锛?br>mysql> create procedure pro15()
| 聽 |
聽聽聽聽-> begin
聽聽聽聽-> declare i int default 0;
聽聽聽聽-> loop_label:loop
聽聽聽聽->聽聽聽聽聽if i=3 then
聽聽聽聽->聽聽聽聽聽聽聽聽聽set i=i+1;
聽聽聽聽->聽聽聽聽聽聽聽聽聽iterate loop_label;
聽聽聽聽->聽聽聽聽聽end if;
聽聽聽聽->聽聽聽聽聽insert into t1(filed) values(i);
聽聽聽聽->聽聽聽聽聽set i=i+1;
聽聽聽聽->聽聽聽聽聽if i>=5 then
聽聽聽聽->聽聽聽聽聽聽聽聽leave loop_label;
聽聽聽聽->聽聽聽聽聽end if;
聽聽聽聽->聽聽聽end loop;
聽聽聽聽-> end;//
Query OK, 0 rows affected (0.00 sec)
聽聽聽聽iterate璇?彞鍜宭eave璇?彞涓?鏍凤紝涔熸槸鍦ㄥ惊鐜?唴閮ㄤ娇鐢?紝瀹冩湁鐐圭被浼间簬C/C++璇?█涓?殑continue銆?br>聽聽聽聽閭ｄ箞杩欎釜瀛樺偍绋嬪簭鏄??庝箞杩愯?鐨勭殑锛熼?鍏坕鐨勫?间负0锛屾潯浠跺垽鏂??鍙?f i=3 then鍒ゆ柇涓哄亣锛岃烦杩噄f璇??锛屽悜鏁版嵁搴撲腑鎻掑叆0锛岀劧鍚巌+1锛屽悓鏍峰悗闈㈢殑if i>=5 then鍒ゆ柇涔熶负鍋囷紝涔熻烦杩囷紱缁х画寰?幆锛屽悓鏍锋彃鍏?鍜?锛涘湪i=3鐨勬椂鍊欐潯浠跺垽鏂??鍙?f i=3 then鍒ゆ柇涓虹湡锛屾墽琛宨=i+1锛宨鍊间负4锛岀劧鍚庢墽琛岃凯浠?terate loop_label;锛屽嵆璇?彞鎵ц?鍒癷terate loop_label;鍚庣洿鎺ヨ烦鍒癷f i=3 then鍒ゆ柇璇?彞锛屾墽琛屽垽鏂?紝杩欎釜鏃跺?欑敱浜巌=4锛宨f i=3 then鍒ゆ柇涓哄亣锛岃烦杩嘔F璇??锛屽皢4娣诲姞鍒拌〃涓?紝i鍙樹负5锛屾潯浠跺垽鏂璱f i>=5 then鍒ゆ柇涓虹湡锛屾墽琛宭eave loop_label;璺冲嚭loop寰?幆锛岀劧鍚庢墽琛宔nd;//锛岀粨鏉熸暣涓?瓨鍌ㄨ繃绋嬨??br>聽聽聽聽缁间笂鎵?杩帮紝鏁版嵁搴撲腑灏嗘彃鍏ユ暟鍊硷細0,1,2,4銆傛墽琛屽瓨鍌ㄨ繃绋嬶紝骞舵煡鐪嬬粨鏋滐細|
mysql> delete from t1//
Query OK, 5 rows affected (0.00 sec)
聽
mysql> call pro15//
Query OK, 1 row affected (0.00 sec)
mysql> select * from t1//
+鈥斺??+
| filed |
+鈥斺??+
|聽聽聽聽聽0 |
|聽聽聽聽聽1 |
|聽聽聽聽聽2 |
|聽聽聽聽聽4 |
+鈥斺??+
4 rows in set (0.00 sec)
鍜屾垜浠?笂闈㈠垎鏋愮殑缁撴灉涓?鏍凤紝鍙?彃鍏ヤ簡鏁板??,1,2,4銆?/p>