![\"\"](\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/04\/20250429023803-68103b8b757c7.png\")
<\/p>\n🏝\ufe0f\u4e13\u680f：Mysql_\u732b\u54aa-9527\u7684\u535a\u5ba2-CSDN\u535a\u5ba2 🌅\u4e3b\u9875：\u732b\u54aa-9527-CSDN\u535a\u5ba2\u00a0<\/p>\n
\u201c\u6b32\u7a77\u5343\u91cc\u76ee，\u66f4\u4e0a\u4e00\u5c42\u697c\u3002\u4f1a\u5f53\u51cc\u7edd\u9876，\u4e00\u89c8\u4f17\u5c71\u5c0f\u3002\u201d<\/p>\n
\u76ee\u5f55<\/p>\n
4. \u5b58\u50a8\u8fc7\u7a0b<\/p>\n
4.1 IF \u5224\u65ad<\/p>\n
4.2 \u5b58\u50a8\u8fc7\u7a0b\u53c2\u6570<\/p>\n
4.2.1 IN \u53c2\u6570\u4f7f\u7528<\/p>\n
4.2.2 OUT \u53c2\u6570\u4f7f\u7528<\/p>\n
4.2.3 INOUT \u53c2\u6570\u4f7f\u7528<\/p>\n
4.3 CASE \u8bed\u53e5<\/p>\n
4.4 WHILE \u5faa\u73af<\/p>\n
4.5 REPEAT \u5faa\u73af<\/p>\n
4.6 LOOP \u5faa\u73af<\/p>\n
5.\u6e38\u6807<\/p>\n
5.1\u00a0\u00a0\u58f0\u660e\u6e38\u6807<\/p>\n
5.2\u00a0\u6253\u5f00\u6e38\u6807<\/p>\n
5.3 \u53d6\u51fa\u6570\u636e<\/p>\n
5.4Handler (\u5f02\u5e38\u5904\u7406\u5668)<\/p>\n
5.4\u00a0\u5173\u95ed\u6e38\u6807<\/p>\n
5.5\u00a0\u6e38\u6807\u7684\u5b8c\u6574\u793a\u4f8b<\/p>\n
6. \u89e6\u53d1\u5668<\/p>\n
6.1 \u521b\u5efa\u89e6\u53d1\u5668<\/p>\n
6.2. \u67e5\u770b\u3001\u5220\u9664\u89e6\u53d1\u5668<\/p>\n
6.3. \u6ce8\u610f\u4e8b\u9879\u4e0e\u5751<\/p>\n
\u5b58\u50a8\u8fc7\u7a0b\u662f\u7531\u4e00\u7ec4 SQL \u8bed\u53e5\u6784\u6210\u7684\u6570\u636e\u5e93\u5bf9\u8c61，\u5b58\u50a8\u8fc7\u7a0b\u53ef\u4ee5\u88ab\u5b58\u50a8\u5728\u6570\u636e\u5e93\u4e2d\u5e76\u5728\u9700\u8981\u65f6\u6267\u884c\u3002\u5b83\u652f\u6301\u63a7\u5236\u6d41\u7ed3\u6784（\u5982 IF \u8bed\u53e5\u3001CASE \u8bed\u53e5\u3001\u5faa\u73af\u7b49），\u80fd\u591f\u5c01\u88c5\u548c\u91cd\u7528\u6570\u636e\u5e93\u64cd\u4f5c，\u63d0\u5347\u4ee3\u7801\u7684\u6a21\u5757\u5316\u548c\u53ef\u7ef4\u62a4\u6027\u3002<\/p>\n
IF \u8bed\u53e5\u662f MySQL \u5b58\u50a8\u8fc7\u7a0b\u4e2d\u7684\u4e00\u79cd\u5e38\u89c1\u63a7\u5236\u6d41\u7ed3\u6784，\u7528\u4e8e\u6839\u636e\u7279\u5b9a\u6761\u4ef6\u6267\u884c\u4e0d\u540c\u7684 SQL \u8bed\u53e5\u3002\u5b83\u53ef\u4ee5\u5355\u72ec\u4f7f\u7528，\u4e5f\u53ef\u4ee5\u4e0e ELSE \u548c ELSEIF \u914d\u5408\u4f7f\u7528，\u4ece\u800c\u5f62\u6210\u591a\u5206\u652f\u7684\u6761\u4ef6\u5224\u65ad\u7ed3\u6784\u3002<\/p>\n
\u8bed\u6cd5：<\/p>\n
IF condition THEN
\n — \u6267\u884c\u7684 SQL \u8bed\u53e5
\nELSEIF condition THEN
\n — \u6267\u884c\u7684 SQL \u8bed\u53e5
\nELSE
\n — \u6267\u884c\u7684 SQL \u8bed\u53e5
\nEND IF;<\/p>\n
\u793a\u4f8b：<\/p>\n
DELIMITER $$<\/p>\n
CREATE PROCEDURE CheckScore()
\nBEGIN
\n DECLARE score INT DEFAULT 58;
\n DECLARE result VARCHAR(10);<\/p>\n
IF score >= 80 THEN
\n SET result := '\u4f18\u79c0';
\n ELSEIF score >= 60 THEN
\n SET result := '\u53ca\u683c';
\n ELSE
\n SET result := '\u4e0d\u53ca\u683c';
\n END IF;<\/p>\n
SELECT result;
\nEND$$<\/p>\n
DELIMITER ;<\/p>\n
<\/p>\n
\u5b58\u50a8\u8fc7\u7a0b\u53ef\u4ee5\u63a5\u53d7\u4e09\u79cd\u7c7b\u578b\u7684\u53c2\u6570：IN\u3001OUT \u548c INOUT\u3002\u6bcf\u79cd\u7c7b\u578b\u7684\u53c2\u6570\u6709\u4e0d\u540c\u7684\u4f5c\u7528，\u5206\u522b\u7528\u4e8e\u6570\u636e\u7684\u8f93\u5165\u3001\u8f93\u51fa\u6216\u540c\u65f6\u8f93\u5165\u8f93\u51fa\u3002<\/p>\n
\u8bed\u6cd5：<\/p>\n
CREATE PROCEDURE \u5b58\u50a8\u8fc7\u7a0b\u540d\u79f0 (IN\/OUT\/INOUT \u53c2\u6570\u540d \u53c2\u6570\u7c7b\u578b)
\nBEGIN
\n — SQL \u8bed\u53e5
\nEND;<\/p>\n
IN \u53c2\u6570\u7528\u4e8e\u5411\u5b58\u50a8\u8fc7\u7a0b\u4f20\u9012\u8f93\u5165\u503c，\u5b58\u50a8\u8fc7\u7a0b\u5185\u90e8\u53ef\u4ee5\u4f7f\u7528\u8fd9\u4e9b\u503c\u8fdb\u884c\u8ba1\u7b97\u6216\u67e5\u8be2\u64cd\u4f5c\u3002<\/p>\n
\u793a\u4f8b：<\/p>\n
DELIMITER $$<\/p>\n
CREATE PROCEDURE CheckScoreIN(IN score INT)
\nBEGIN
\n DECLARE result VARCHAR(10);<\/p>\n
IF score >= 80 THEN
\n SET result := '\u4f18\u79c0';
\n ELSEIF score >= 60 THEN
\n SET result := '\u53ca\u683c';
\n ELSE
\n SET result := '\u4e0d\u53ca\u683c';
\n END IF;<\/p>\n
SELECT result;
\nEND$$<\/p>\n
DELIMITER ;<\/p>\n
![\"\"](\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/04\/20250429023803-68103b8baf148.png\")
<\/p>\n
OUT \u53c2\u6570\u7528\u4e8e\u5b58\u50a8\u8fc7\u7a0b\u8fd4\u56de\u503c\u3002\u6267\u884c\u5b58\u50a8\u8fc7\u7a0b\u65f6，\u8fd4\u56de\u7ed3\u679c\u5c06\u901a\u8fc7 OUT \u53c2\u6570\u4f20\u9012\u7ed9\u8c03\u7528\u8005\u3002<\/p>\n
\u793a\u4f8b：<\/p>\n
DELIMITER $$<\/p>\n
CREATE PROCEDURE CheckScoreOUT(IN score INT, OUT result VARCHAR(20))
\nBEGIN
\n IF score >= 80 THEN
\n SET result := '\u4f18\u79c0';
\n ELSEIF score >= 60 THEN
\n SET result := '\u53ca\u683c';
\n ELSE
\n SET result := '\u4e0d\u53ca\u683c';
\n END IF;
\nEND$$<\/p>\n
DELIMITER ;<\/p>\n
![\"\"](\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/04\/20250429023803-68103b8be8679.png\")
<\/p>\n
INOUT \u53c2\u6570\u65e2\u53ef\u4ee5\u4f5c\u4e3a\u8f93\u5165\u503c，\u4e5f\u53ef\u4ee5\u7528\u4f5c\u5b58\u50a8\u8fc7\u7a0b\u8fd4\u56de\u7684\u8f93\u51fa\u503c\u3002<\/p>\n
\u793a\u4f8b：<\/p>\n
DELIMITER $$<\/p>\n
CREATE PROCEDURE CheckScoreINOUT(INOUT score DOUBLE)
\nBEGIN
\n SET score := score * 0.5;
\nEND$$<\/p>\n
DELIMITER ;<\/p>\n
![\"\"](\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/04\/20250429023804-68103b8c39619.png\")
<\/p>\n
CASE \u8bed\u53e5\u662f\u4e00\u79cd\u6761\u4ef6\u8868\u8fbe\u5f0f，\u5141\u8bb8\u6839\u636e\u4e0d\u540c\u7684\u6761\u4ef6\u9009\u62e9\u4e0d\u540c\u7684\u7ed3\u679c\u3002\u5b83\u901a\u5e38\u7528\u4e8e SELECT \u67e5\u8be2\u3001UPDATE \u8bed\u53e5\u6216\u5b58\u50a8\u8fc7\u7a0b\u4e2d\u7684\u6761\u4ef6\u5224\u65ad\u3002<\/p>\n
\u8bed\u6cd5：<\/p>\n
CASE expression
\n WHEN value1 THEN result1
\n WHEN value2 THEN result2
\n WHEN value3 THEN result3
\n ELSE default_result
\nEND<\/p>\n
\u793a\u4f8b：<\/p>\n
DELIMITER $$<\/p>\n
CREATE PROCEDURE CheckGrade(IN score INT, OUT grade VARCHAR(3))
\nBEGIN
\n CASE
\n WHEN score BETWEEN 90 AND 100 THEN SET grade := 'A';
\n WHEN score BETWEEN 80 AND 89 THEN SET grade := 'B';
\n WHEN score BETWEEN 60 AND 79 THEN SET grade := 'C';
\n WHEN score BETWEEN 0 AND 59 THEN SET grade := 'D';
\n ELSE SET grade := 'NO';
\n END CASE;
\nEND$$<\/p>\n
DELIMITER ;<\/p>\n
WHILE \u5faa\u73af\u662f MySQL \u4e2d\u7684\u4e00\u79cd\u5e38\u89c1\u63a7\u5236\u7ed3\u6784，\u7528\u4e8e\u5728\u6307\u5b9a\u6761\u4ef6\u4e3a TRUE \u65f6\u91cd\u590d\u6267\u884c\u4e00\u7ec4 SQL \u8bed\u53e5，\u76f4\u5230\u6761\u4ef6\u4e0d\u518d\u6ee1\u8db3\u4e3a\u6b62\u3002<\/p>\n
\u8bed\u6cd5：<\/p>\n
WHILE condition DO
\n — \u6267\u884c\u7684 SQL \u8bed\u53e5
\nEND WHILE;<\/p>\n
\u793a\u4f8b：<\/p>\n
DELIMITER $$<\/p>\n
CREATE PROCEDURE SumNumbers(IN n INT)
\nBEGIN
\n DECLARE a INT DEFAULT 0;
\n WHILE n >= 0 DO
\n SET a := a + n;
\n SET n := n – 1;
\n END WHILE;
\n SELECT a;
\nEND$$<\/p>\n
DELIMITER ;<\/p>\n
REPEAT \u5faa\u73af\u4e0e WHILE \u5faa\u73af\u7c7b\u4f3c，\u4e0d\u540c\u4e4b\u5904\u5728\u4e8e\u5b83\u5728\u6bcf\u6b21\u6267\u884c\u4ee3\u7801\u5757\u540e\u624d\u68c0\u67e5\u6761\u4ef6，\u76f4\u5230\u6ee1\u8db3\u9000\u51fa\u6761\u4ef6\u4e3a\u6b62\u3002<\/p>\n
\u8bed\u6cd5：<\/p>\n
REPEAT
\n — \u6267\u884c\u7684 SQL \u8bed\u53e5
\nUNTIL condition
\nEND REPEAT;<\/p>\n
\u793a\u4f8b：<\/p>\n
DELIMITER $$<\/p>\n
CREATE PROCEDURE SumNumbersUsingRepeat(IN n INT)
\nBEGIN
\n DECLARE a INT DEFAULT 0;
\n REPEAT
\n SET a := a + n;
\n SET n := n – 1;
\n UNTIL n <= 0
\n END REPEAT;
\n SELECT a;
\nEND$$<\/p>\n
DELIMITER ;<\/p>\n
LOOP \u5faa\u73af\u662f\u53e6\u4e00\u79cd\u63a7\u5236\u7ed3\u6784，\u9002\u7528\u4e8e\u9700\u8981\u53cd\u590d\u6267\u884c\u67d0\u4e9b\u64cd\u4f5c，\u76f4\u5230\u6ee1\u8db3\u7279\u5b9a\u9000\u51fa\u6761\u4ef6\u65f6\u505c\u6b62\u3002\u4e0e REPEAT \u548c WHILE \u5faa\u73af\u4e0d\u540c，LOOP \u5fc5\u987b\u663e\u5f0f\u4f7f\u7528 LEAVE \u8bed\u53e5\u6765\u9000\u51fa\u5faa\u73af，\u5426\u5219\u5b83\u4f1a\u65e0\u9650\u6267\u884c\u3002<\/p>\n
\u8bed\u6cd5：<\/p>\n
loop_label : LOOP
\n — \u6267\u884c\u7684 SQL \u8bed\u53e5
\n IF condition THEN
\n LEAVE loop_label; — \u9000\u51fa\u5faa\u73af
\n END IF;
\nEND LOOP;<\/p>\n
\u793a\u4f8b：<\/p>\n
DELIMITER $$<\/p>\n
CREATE PROCEDURE SumOddNumbers(IN n INT)
\nBEGIN
\n DECLARE a INT DEFAULT 0;
\nsum_loop: LOOP
\n IF n % 2 = 0 THEN
\n SET n := n – 1;
\n ITERATE sum_loop;
\n END IF;
\n SET a := a + n;
\n SET n := n – 1;
\n IF n = 0 THEN
\n LEAVE sum_loop;
\n END IF;
\nEND LOOP;
\n SELECT a;
\nEND$$<\/p>\n
DELIMITER ;<\/p>\n
\u5728 MySQL \u4e2d，\u6e38\u6807（Cursor）\u662f\u4e00\u79cd\u7528\u4e8e\u904d\u5386\u67e5\u8be2\u7ed3\u679c\u96c6\u7684\u673a\u5236\u3002\u6e38\u6807\u5141\u8bb8\u4f60\u9010\u884c\u5904\u7406\u67e5\u8be2\u7ed3\u679c，\u5bf9\u4e8e\u4e00\u4e9b\u590d\u6742\u7684\u64cd\u4f5c，\u6bd4\u5982\u9010\u884c\u5904\u7406\u6570\u636e\u3001\u8fdb\u884c\u590d\u6742\u7684\u8ba1\u7b97\u7b49，\u6e38\u6807\u975e\u5e38\u6709\u7528\u3002\u901a\u5e38，\u6e38\u6807\u7528\u4e8e\u5b58\u50a8\u8fc7\u7a0b\u4e2d，\u5728\u9700\u8981\u9010\u884c\u5904\u7406\u7ed3\u679c\u96c6\u65f6\u4f7f\u7528\u3002\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0<\/p>\n
\u4f7f\u7528 DECLARE \u8bed\u53e5\u58f0\u660e\u6e38\u6807\u3002\u5728\u58f0\u660e\u6e38\u6807\u65f6，\u9700\u8981\u6307\u5b9a\u6e38\u6807\u57fa\u4e8e\u7684\u67e5\u8be2\u3002<\/p>\n
\u8bed\u6cd5：<\/p>\n
DECLARE \u6e38\u6807\u540d CURSOR FOR \u67e5\u8be2\u8bed\u53e5;<\/p>\n
\u901a\u8fc7 OPEN \u8bed\u53e5\u6253\u5f00\u6e38\u6807\u5e76\u6267\u884c\u67e5\u8be2\u3002<\/p>\n
\u8bed\u6cd5：<\/p>\n
OPEN \u6e38\u6807\u540d;<\/p>\n
\u4f7f\u7528 FETCH \u8bed\u53e5\u4ece\u6e38\u6807\u4e2d\u83b7\u53d6\u4e00\u884c\u6570\u636e\u3002<\/p>\n
\u8bed\u6cd5：<\/p>\n
FETCH NEXT FROM \u6e38\u6807\u540d INTO \u53d8\u91cf\u5217\u8868;<\/p>\n
FETCH \u4f1a\u5c06\u6e38\u6807\u5f53\u524d\u6307\u5411\u7684\u884c\u7684\u6570\u636e\u52a0\u8f7d\u5230\u6307\u5b9a\u7684\u53d8\u91cf\u4e2d\u3002<\/p>\n
\u5728 MySQL \u4e2d，Handler（\u5f02\u5e38\u5904\u7406\u5668） \u662f\u4e00\u79cd\u7528\u4e8e\u5904\u7406\u5b58\u50a8\u8fc7\u7a0b\u4e2d\u7684\u5f02\u5e38\u548c\u9519\u8bef\u7684\u673a\u5236\u3002Handler \u53ef\u4ee5\u5e2e\u52a9\u5728\u9047\u5230\u7279\u5b9a\u6761\u4ef6（\u5982\u67e5\u8be2\u7ed3\u679c\u4e3a\u7a7a\u3001\u9519\u8bef\u53d1\u751f\u7b49）\u65f6，\u81ea\u52a8\u6267\u884c\u6307\u5b9a\u7684\u64cd\u4f5c，\u4ece\u800c\u63d0\u9ad8\u7a0b\u5e8f\u7684\u5065\u58ee\u6027\u548c\u7075\u6d3b\u6027\u3002<\/p>\n
MySQL \u63d0\u4f9b\u4e86\u591a\u79cd Handler \u7c7b\u578b，\u4e3b\u8981\u901a\u8fc7 DECLARE \u8bed\u53e5\u58f0\u660e\u3002\u5728\u5b58\u50a8\u8fc7\u7a0b\u4e2d，Handler \u7528\u4e8e\u6355\u83b7\u7279\u5b9a\u6761\u4ef6（\u5982\u67e5\u8be2\u6ca1\u6709\u8fd4\u56de\u7ed3\u679c\u3001\u89e6\u53d1\u9519\u8bef\u7b49），\u5e76\u6267\u884c\u76f8\u5e94\u7684\u64cd\u4f5c\u3002<\/p>\n
Handler \u673a\u5236\u7684\u76ee\u7684\u662f：\u5f53\u9047\u5230\u5f02\u5e38\u6216\u7279\u5b9a\u6761\u4ef6\u65f6，\u4e0d\u9700\u8981\u8ba9\u5b58\u50a8\u8fc7\u7a0b\u4e2d\u65ad，\u800c\u662f\u53ef\u4ee5\u7ee7\u7eed\u6267\u884c\u540e\u7eed\u7684\u903b\u8f91\u3002<\/p>\n
Handler \u7684\u57fa\u672c\u8bed\u6cd5:<\/p>\n
DECLARE handler_type HANDLER FOR condition_value action;<\/p>\n
handler_type：\u6307\u5b9a\u5904\u7406\u5668\u7684\u7c7b\u578b，\u5e38\u89c1\u7684\u7c7b\u578b\u6709：<\/p>\n
CONTINUE：\u9047\u5230\u5f02\u5e38\u6216\u6761\u4ef6\u65f6\u7ee7\u7eed\u6267\u884c\u540e\u7eed\u8bed\u53e5\u3002<\/p>\n<\/li>\n
EXIT：\u9047\u5230\u5f02\u5e38\u6216\u6761\u4ef6\u65f6\u9000\u51fa\u5b58\u50a8\u8fc7\u7a0b\u6216\u5faa\u73af\u3002<\/p>\n<\/li>\n<\/ul>\n<\/li>\n
condition_value：\u6307\u5b9a\u6761\u4ef6，\u53ef\u4ee5\u662f：<\/p>\n
NOT FOUND：\u8868\u793a\u6ca1\u6709\u627e\u5230\u6570\u636e（\u901a\u5e38\u4e0e SELECT \u67e5\u8be2\u7ed3\u679c\u4e3a\u7a7a\u65f6\u7ed3\u5408\u4f7f\u7528）02\u3002<\/p>\n<\/li>\n
SQLWARNING：\u8868\u793a SQL \u8b66\u544a\u300201<\/p>\n<\/li>\n
SQLEXCEPTION：\u8868\u793a SQL \u5f02\u5e38（\u5982\u67e5\u8be2\u9519\u8bef\u3001\u63d2\u5165\u5931\u8d25\u7b49），\u966401\u548c02<\/p>\n<\/li>\n<\/ul>\n<\/li>\n
action：\u5728\u6ee1\u8db3\u6307\u5b9a\u6761\u4ef6\u65f6\u8981\u6267\u884c\u7684\u64cd\u4f5c，\u4f8b\u5982\u8bbe\u7f6e\u53d8\u91cf\u3001\u6253\u5370\u9519\u8bef\u4fe1\u606f\u3001\u9000\u51fa\u7b49\u3002<\/p>\n<\/li>\n<\/ul>\n
declare exit handler for sqlstate '02000';——\u9000\u51fa\u7801\u9000\u51fa
\ndeclare exit handler for not found ;————\u672a\u627e\u5230\u9000\u51fa01
\ndeclare exit handler for sqlwarning;————sql\u8b66\u544a\u9000\u51fa02 <\/p>\n
\u5f53\u6570\u636e\u5904\u7406\u5b8c\u6bd5\u540e，\u4f7f\u7528 CLOSE \u8bed\u53e5\u5173\u95ed\u6e38\u6807\u3002<\/p>\n
\u8bed\u6cd5：<\/p>\n
CLOSE \u6e38\u6807\u540d;<\/p>\n
\u5b8c\u6574\u7684\u793a\u4f8b：<\/p>\n
delimiter ##
\ncreate procedure s10(in p_sdept varchar(10))
\nbegin
\n declare c_snme varchar(20);
\n declare c_sno varchar(5);
\n declare c_birthday date;
\n declare c_name cursor for
\n select sno,snme,birthday from student where p_sdept=sdept;
\n declare exit handler for not found close c_name;<\/p>\n
create table if not exists r1
\n ( id varchar(5),
\n name varchar(20),
\n birthday date
\n );
\n open c_name;
\n while true do
\n fetch c_name into c_sno,c_snme,c_birthday;
\n insert into r1 values( c_sno,c_snme,c_birthday);
\n end while;
\n close c_name;
\nend ##
\ndelimiter ; <\/p>\n
![\"\"](\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/04\/20250429023804-68103b8c850ba.png\")
<\/h4>\n\u5b9a\u4e49：\u9884\u5148\u7ed1\u5b9a\u5728\u8868\u4e0a\u7684\u4e00\u6bb5 SQL \u4ee3\u7801，\u5f53\u6ee1\u8db3\u6307\u5b9a\u4e8b\u4ef6（INSERT\/UPDATE\/DELETE）\u5e76\u5230\u8fbe\u6307\u5b9a\u65f6\u673a（BEFORE\/AFTER）\u65f6，\u7531 MySQL \u81ea\u52a8\u6267\u884c\u3002<\/p>\n<\/li>\n
\u4f5c\u7528：\u6570\u636e\u6821\u9a8c\u3001\u81ea\u52a8\u8865\u5145\u6d3e\u751f\u5b57\u6bb5\u3001\u5199\u5ba1\u8ba1\u65e5\u5fd7\u3001\u540c\u6b65\u5197\u4f59\u8868\u7b49\u3002<\/p>\n<\/li>\n
\u6267\u884c\u7c92\u5ea6：MySQL \u53ea\u652f\u6301 \u884c\u7ea7\u89e6\u53d1\u5668（FOR EACH ROW），\u6ca1\u6709\u8bed\u53e5\u7ea7\u89e6\u53d1\u5668\u3002\u5bf9\u8868\u91cc\u6bcf\u4e00\u884c\u53d7\u5f71\u54cd\u7684\u8bb0\u5f55\u90fd\u4f1a\u6267\u884c\u4e00\u6b21\u89e6\u53d1\u5668\u4f53\u3002<\/p>\n<\/li>\n<\/ul>\n
\u521b\u5efa\u89e6\u53d1\u5668\u65f6，\u9996\u5148\u4f7f\u7528 DELIMITER \u4e34\u65f6\u6539\u53d8\u8bed\u53e5\u5206\u9694\u7b26，\u4ee5\u4fbf\u5728\u89e6\u53d1\u5668\u4f53\u5185\u4f7f\u7528\u5206\u53f7\u3002\u7136\u540e，\u901a\u8fc7 CREATE TRIGGER \u8bed\u53e5\u521b\u5efa\u89e6\u53d1\u5668\u3002<\/p>\n
DELIMITER $$ — \u4e34\u65f6\u6362\u5206\u9694\u7b26，\u907f\u514d\u78b0\u5230\u89e6\u53d1\u5668\u4f53\u5185\u7684\u5206\u53f7<\/p>\n
CREATE TRIGGER \u89e6\u53d1\u5668\u540d
\n{BEFORE | AFTER} {INSERT | UPDATE | DELETE}
\nON \u8868\u540d
\nFOR EACH ROW
\nBEGIN
\n — \u89e6\u53d1\u5668\u4f53：\u53ef\u5199\u591a\u6761\u8bed\u53e5
\n — \u53ef\u7528 NEW.\u5217\u540d \u8bbf\u95ee\u201c\u65b0\u503c\u201d
\n — \u53ef\u7528 OLD.\u5217\u540d \u8bbf\u95ee\u201c\u65e7\u503c\u201d（\u5bf9\u4e8e INSERT \u6ca1\u65e7\u503c，DELETE \u6ca1\u65b0\u503c）
\nEND$$<\/p>\n
DELIMITER ; — \u6062\u590d\u9ed8\u8ba4\u5206\u9694\u7b26<\/p>\n
\u547d\u540d\u7ea6\u5b9a：\u63a8\u8350 \u8868\u540d_\u4e8b\u4ef6_\u65f6\u673a_trigger，\u5982 student_ai_trigger \u8868\u793a After Insert \u7684\u89e6\u53d1\u5668\u3002<\/p>\n
— \u67e5\u770b\u5f53\u524d\u5e93\u6240\u6709\u89e6\u53d1\u5668
\nSHOW TRIGGERS\\\\G<\/p>\n
— \u67e5\u770b\u67d0\u89e6\u53d1\u5668\u7684\u521b\u5efa\u8bed\u53e5
\nSHOW CREATE TRIGGER student_ai_log\\\\G<\/p>\n
— \u5220\u9664\u89e6\u53d1\u5668
\nDROP TRIGGER IF EXISTS student_ai_log;<\/p>\n
| \u6743\u9650<\/td>\n | \u9700\u8981 TRIGGER \u6743\u9650（\u6216 SUPER）\u624d\u80fd\u521b\u5efa\/\u5220\u9664\u3002<\/td>\n<\/tr>\n |
| \u5355\u8868\u540c\u4e8b\u4ef6\u591a\u89e6\u53d1\u5668<\/td>\n | MySQL 8.0 \u5141\u8bb8\u540c\u4e00 \u201c\u4e8b\u4ef6+\u65f6\u673a\u201d \u521b\u5efa\u591a\u4e2a\u89e6\u53d1\u5668，\u4f46 5.7 \u53ca\u66f4\u65e9\u7248\u672c\u53ea\u5141\u8bb8\u4e00\u4e2a\u3002<\/td>\n<\/tr>\n |
| \u9012\u5f52\u89e6\u53d1<\/td>\n | \u89e6\u53d1\u5668\u91cc\u5bf9\u540c\u4e00\u5f20\u8868\u518d INSERT\/UPDATE\/DELETE \u4f1a\u518d\u6b21\u89e6\u53d1，\u8c28\u9632\u65e0\u9650\u9012\u5f52\u3002<\/td>\n<\/tr>\n |
| \u4e8b\u52a1<\/td>\n | \u89e6\u53d1\u5668\u5728\u5f53\u524d\u4e8b\u52a1\u4e2d\u6267\u884c，\u82e5\u89e6\u53d1\u5668\u62a5\u9519，\u6574\u4e2a\u5916\u5c42\u8bed\u53e5\u4f1a\u56de\u6eda\u3002<\/td>\n<\/tr>\n |
| NEW\/OLD \u53ea\u8bfb\u9650\u5236<\/td>\n | BEFORE UPDATE \u4e2d\u53ef\u4fee\u6539 NEW.xxx \u6765\u5f71\u54cd\u5373\u5c06\u5199\u5165\u7684\u503c；\u5176\u4ed6\u573a\u666f NEW\/OLD \u5747\u53ea\u8bfb\u3002<\/td>\n<\/tr>\n |
| \u4e0d\u652f\u6301 COMMIT\/ROLLBACK<\/td>\n | \u89e6\u53d1\u5668\u4f53\u5185\u7981\u6b62\u663e\u5f0f\u63d0\u4ea4\u6216\u56de\u6eda\u3002<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n DELIMITER ##<\/p>\n CREATE TRIGGER tb_user_insert_trigger \u6587\u7ae0\u6d4f\u89c8\u9605\u8bfb1k\u6b21\uff0c\u70b9\u8d5e108\u6b21\uff0c\u6536\u85cf96\u6b21\u3002\u9884\u5148\u7ed1\u5b9a\u5728\u8868\u4e0a\u7684\u4e00\u6bb5 SQL \u4ee3\u7801\uff0c\u5f53\u6ee1\u8db3\u6307\u5b9a\u4e8b\u4ef6\uff08<\/p>\n","protected":false},"author":2,"featured_media":34348,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[114,100],"topic":[],"class_list":["post-34353","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-server","tag-mysql","tag-100"],"yoast_head":"\n |