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NOVOTS KMS .: Êý¾Ý¿â .: MySQLÊý¾Ý¿âÖ®UPDATE¸üÐÂÓï¾ä¾«½â

MySQLÊý¾Ý¿âÖ®UPDATE¸üÐÂÓï¾ä¾«½â

Ò»¡¢INSERTºÍREPLACE

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1. INSERTµÄÒ»°ãÓ÷¨

MySQLÖеÄINSERTÓï¾äºÍ±ê×¼µÄINSERT²»Ì«Ò»Ñù£¬ÔÚ±ê×¼µÄSQLÓï¾äÖУ¬Ò»´Î²åÈëÒ»Ìõ¼Ç¼µÄINSERTÓï¾äÖ»ÓÐÒ»ÖÖÐÎʽ¡£

INSERT INTO tablename(ÁÐÃû¡­) VALUES(ÁÐÖµ);

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INSERT INTO tablename SET column_name1 = value1, column_name2 = value2£¬¡­;

µÚÒ»ÖÖ·½·¨½«ÁÐÃûºÍÁÐÖµ·Ö¿ªÁË£¬ÔÚʹÓÃʱ£¬ÁÐÃû±ØÐëºÍÁÐÖµµÄÊýÒ»Ö¡£ÈçÏÂÃæµÄÓï¾äÏòusers±íÖвåÈëÁËÒ»Ìõ¼Ç¼£º

INSERT INTO users(id, name, age) VALUES(123, 'Ò¦Ã÷', 25);

µÚ¶þÖÖ·½·¨ÔÊÐíÁÐÃûºÍÁÐÖµ³É¶Ô³öÏÖºÍʹÓã¬ÈçÏÂÃæµÄÓï¾ä½«²úÉúÖÐÑùµÄЧ¹û¡£

INSERT INTO users SET id = 123, name = 'Ò¦Ã÷', age = 25;

Èç¹ûʹÓÃÁËSET·½Ê½£¬±ØÐëÖÁÉÙΪһÁи³Öµ¡£Èç¹ûijһ¸ö×Ö¶ÎʹÓÃÁËʡȱֵ(ÈçĬÈÏ»ò×ÔÔöÖµ)£¬ÕâÁ½ÖÖ·½·¨¶¼¿ÉÒÔÊ¡ÂÔÕâЩ×ֶΡ£Èçid×Ö¶ÎÉÏʹÓÃÁË×ÔÔöÖµ£¬ÉÏÃæÁ½ÌõÓï¾ä¿ÉÒÔд³ÉÈçÏÂÐÎʽ£º

INSERT INTO users (name, age) VALUES('Ò¦Ã÷',25);

INSERT INTO uses SET name = 'Ò¦Ã÷', age = 25;

MySQLÔÚVALUESÉÏÒ²×öÁËЩ±ä»¯¡£Èç¹ûVALUESÖÐʲô¶¼²»Ð´£¬ÄÇMySQL½«Ê¹ÓñíÖÐÿһÁеÄĬÈÏÖµÀ´²åÈëмǼ¡£

INSERT INTO users () VALUES();

Èç¹û±íÃûºóʲô¶¼²»Ð´£¬¾Í±íʾÏò±íÖÐËùÓеÄ×ֶθ³Öµ¡£Ê¹ÓÃÕâÖÖ·½Ê½£¬²»½öÔÚVALUESÖеÄÖµÒªºÍÁÐÊýÒ»Ö£¬¶øÇÒ˳Ðò²»Äܵߵ¹¡£

 INSERT INTO users VALUES(123, 'Ò¦Ã÷', 25);

Èç¹û½«INSERTÓï¾äд³ÉÈçÏÂÐÎʽMySQL½«»á±¨´í¡£

INSERT INTO users VALUES('Ò¦Ã÷',25);

2. ʹÓÃINSERT²åÈë¶àÌõ¼Ç¼

¿´µ½Õâ¸ö±êÌâÒ²Ðí´ó¼Ò»áÎÊ£¬ÕâÓÐʲôºÃ˵µÄ£¬µ÷Óöà´ÎINSERTÓï¾ä²»¾Í¿ÉÒÔ²åÈë¶àÌõ¼Ç¼ÁËÂð!µ«Ê¹ÓÃÕâÖÖ·½·¨ÒªÔö¼Ó·þÎñÆ÷µÄ¸ººÉ£¬ÒòΪ£¬Ö´ÐÐÿһ´ÎSQL·þÎñÆ÷¶¼ÒªÍ¬Ñù¶ÔSQL½øÐзÖÎö¡¢ÓÅ»¯µÈ²Ù×÷¡£ÐÒºÃMySQLÌṩÁËÁíÒ»ÖÖ½â¾ö·½°¸£¬¾ÍÊÇʹÓÃÒ»ÌõINSERTÓï¾äÀ´²åÈë¶àÌõ¼Ç¼¡£Õâ²¢²»ÊDZê×¼µÄSQLÓï·¨£¬Òò´ËÖ»ÄÜÔÚMySQLÖÐʹÓá£

INSERT INTO users(name, age) VALUES('Ò¦Ã÷', 25), ('±È¶û.¸Ç´Ä', 50), ('»ðÐÇÈË', 600);

ÉÏÃæµÄINSERT Óï¾äÏòusers±íÖÐÁ¬Ðø²åÈëÁË3Ìõ¼Ç¼¡£ÖµµÃ×¢ÒâµÄÊÇ£¬ÉÏÃæµÄINSERTÓï¾äÖеÄVALUESºó±ØÐëÿһÌõ¼Ç¼µÄÖµ·Åµ½Ò»¶Ô(¡­)ÖУ¬ÖмäʹÓÃ","·Ö¸î¡£¼ÙÉèÓÐÒ»¸ö±ítable1

CREATE TABLE table1(n INT);

Èç¹ûÒªÏòtable1ÖвåÈë5Ìõ¼Ç¼£¬ÏÂÃæÐ´·¨ÊÇ´íÎóµÄ£º

INSERT INTO table1 (i) VALUES(1,2,3,4,5);

MySQL½«»áÅ׳öÏÂÃæµÄ´íÎó

ERROR 1136: Column count doesn't match value count at row 1

¶øÕýÈ·µÄд·¨Ó¦¸ÃÊÇÕâÑù£º

INSERT INTO table1(i) VALUES(1),(2),(3),(4),(5);

µ±È»£¬ÕâÖÖд·¨Ò²¿ÉÒÔÊ¡ÂÔÁÐÃû£¬ÕâÑùÿһ¶ÔÀ¨ºÅÀïµÄÖµµÄÊýÄ¿±ØÐëÒ»Ö£¬¶øÇÒÕâ¸öÊýÄ¿±ØÐëºÍÁÐÊýÒ»Ö¡£È磺

INSERT INTO table1 VALUES(1),(2),(3),(4),(5);

3. REPLACEÓï¾ä

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ʹÓÃREPLACEµÄ×î´óºÃ´¦¾ÍÊÇ¿ÉÒÔ½«DELETEºÍINSERTºÏ¶þΪһ£¬ÐγÉÒ»¸öÔ­×Ó²Ù×÷¡£ÕâÑù¾Í¿ÉÒÔ²»±Ø¿¼ÂÇÔÚͬʱʹÓÃDELETEºÍINSERTʱÌí¼ÓÊÂÎñµÈ¸´ÔÓ²Ù×÷ÁË¡£

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REPLACEµÄÓï·¨ºÍINSERT·Ç³£µÄÏàËÆ£¬ÈçÏÂÃæµÄREPLACEÓï¾äÊDzåÈë»ò¸üÐÂÒ»Ìõ¼Ç¼¡£

REPLACE INTO users (id,name,age) VALUES(123, 'ÕÔ±¾É½', 50);

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REPLACE INTO users(id, name, age) VALUES(123, 'ÕÔ±¾É½', 50), (134,'Mary',15);

REPLACEÒ²¿ÉÒÔʹÓÃSETÓï¾ä

REPLACE INTO users SET id = 123, name = 'ÕÔ±¾É½', age = 50;

ÉÏÃæÔøÌáµ½REPLACE¿ÉÄÜÓ°Ïì3ÌõÒÔÉϵļǼ£¬ÕâÊÇÒòΪÔÚ±íÖÐÓг¬¹ýÒ»¸öµÄΨһË÷Òý¡£ÔÚÕâÖÖÇé¿öÏ£¬REPLACE½«¿¼ÂÇÿһ¸öΨһË÷Òý£¬²¢¶Ôÿһ¸öË÷Òý¶ÔÓ¦µÄÖØ¸´¼Ç¼¶¼É¾³ý£¬È»ºó²åÈëÕâÌõмǼ¡£¼ÙÉèÓÐÒ»¸ötable1±í£¬ÓÐ3¸ö×Ö¶Îa, b, c¡£ËüÃǶ¼ÓÐÒ»¸öΨһË÷Òý¡£

CREATE TABLE table1(a INT NOT NULL UNIQUE,b INT NOT NULL UNIQUE,c INT NOT NULL UNIQUE);

¼ÙÉètable1ÖÐÒѾ­ÓÐÁË3Ìõ¼Ç¼

a b c

1 1 1

2 2 2

3 3 3

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REPLACE INTO table1(a, b, c) VALUES(1,2,3);

·µ»ØµÄ½á¹ûÈçÏÂ

Query OK, 4 rows affected (0.00 sec)

ÔÚtable1ÖеļǼÈçÏÂ

a b c

1 2 3

ÎÒÃÇ¿ÉÒÔ¿´µ½£¬REPLACE½«Ô­ÏȵÄ3Ìõ¼Ç¼¶¼É¾³ýÁË£¬È»ºó½«(1, 2, 3)²åÈë¡£

¶þ¡¢UPDATE

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UPDATE table_anem SET column_name1 = value1, column_name2 = value2, WHERE ;

ÈçÏÂÃæµÄÓï¾ä½«users±íÖÐidµÈÓÚ123µÄ¼Ç¼µÄage¸ÄΪ24

UPDATE users SET age = 24 WHERE id = 123;

ͬÑù£¬¿ÉÒÔʹÓÃUPDATE¸üжà¸ö×ֶεÄÖµ

UPDATE users SET age = 24, name = 'Mike' WHERE id = 123;

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ÓÐÁ½ÖÖÇé¿öUPDATE²»»á¶ÔÓ°Ïì±íÖеÄÊý¾Ý¡£

1. µ±WHEREÖеÄÌõ¼þÔÚ±íÖÐûÓмǼºÍËüÆ¥Åäʱ¡£

2. µ±ÎÒÃǽ«Í¬ÑùµÄÖµ¸³¸øÄ³¸ö×Ö¶Îʱ£¬È罫×Ö¶Îabc¸³Îª'123'£¬¶øabcµÄÔ­Öµ¾ÍÊÇ'123'¡£

ºÍINSERT¡¢REPLACEÒ»Ñù£¬UPDATEÒ²·µ»ØËù¸üеļǼÊý¡£µ«ÕâЩ¼Ç¼Êý²¢²»°üÀ¨Âú×ãWHEREÌõ¼þµÄ£¬µ«È´Î´±»¸üеļǼ¡£ÈçÏÂͬµÄUPDATEÓï¾ä¾Íδ¸üÐÂÈκμǼ¡£

UPDATE users SET age = 30 WHERE id = 12;

Query OK, 0 rows affected (0.00 sec)

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1. UPDATEÔÚûÓÐÆ¥Åä¼Ç¼ʱʲô¶¼²»×ö£¬¶øREPLACEÔÚÓÐÖØ¸´¼Ç¼ʱ¸üУ¬ÔÚûÓÐÖØ¸´¼Ç¼ʱ²åÈë¡£

2. UPDATE¿ÉÒÔÑ¡ÔñÐԵظüмǼµÄÒ»²¿·Ö×ֶΡ£¶øREPLACEÔÚ·¢ÏÖÓÐÖØ¸´¼Ç¼ʱ¾Í½«ÕâÌõ¼Ç¼³¹µ×ɾ³ý£¬ÔÙ²åÈëеļǼ¡£Ò²¾ÍÊÇ˵£¬½«ËùÓеÄ×ֶζ¼¸üÐÂÁË¡£

Èý¡¢DELETEºÍTRUNCATE TABLE

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Èç¹ûÒªÇå¿Õ±íÖеÄËùÓмǼ£¬¿ÉÒÔʹÓÃÏÂÃæµÄÁ½ÖÖ·½·¨£º

DELETE FROM table1

TRUNCATE TABLE table1

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Èç¹ûҪɾ³ý±íÖеIJ¿·Ö¼Ç¼£¬Ö»ÄÜʹÓÃDELETEÓï¾ä¡£

DELETE FROM table1 WHERE ;

Èç¹ûDELETE²»¼ÓWHERE×Ӿ䣬ÄÇôËüºÍTRUNCATE TABLEÊÇÒ»ÑùµÄ£¬µ«ËüÃÇÓÐÒ»µã²»Í¬£¬ÄǾÍÊÇDELETE¿ÉÒÔ·µ»Ø±»É¾³ýµÄ¼Ç¼Êý£¬¶øTRUNCATE TABLE·µ»ØµÄÊÇ0¡£

Èç¹ûÒ»¸ö±íÖÐÓÐ×ÔÔö×ֶΣ¬Ê¹ÓÃTRUNCATE TABLEºÍûÓÐWHERE×Ó¾äµÄDELETEɾ³ýËùÓмǼºó£¬Õâ¸ö×ÔÔö×ֶν«Æðʼֵ»Ö¸´³É1.Èç¹ûÄã²»ÏëÕâÑù×öµÄ»°£¬¿ÉÒÔÔÚDELETEÓï¾äÖмÓÉÏÓÀÕæµÄWHERE£¬ÈçWHERE 1»òWHERE true¡£

DELETE FROM table1 WHERE 1;

ÉÏÃæµÄÓï¾äÔÚÖ´ÐÐʱ½«É¨ÃèÿһÌõ¼Ç¼¡£µ«Ëü²¢²»±È½Ï£¬ÒòΪÕâ¸öWHEREÌõ¼þÓÀԶΪtrue¡£ÕâÑù×öËäÈ»¿ÉÒÔ±£³Ö×ÔÔöµÄ×î´óÖµ£¬µ«ÓÉÓÚËüÊÇɨÃèÁËËùÓеļǼ£¬Òò´Ë£¬ËüµÄÖ´Ðгɱ¾Òª±ÈûÓÐWHERE×Ó¾äµÄDELETE´óµÃ¶à¡£

DELETEºÍTRUNCATE TABLEµÄ×î´óÇø±ðÊÇDELETE¿ÉÒÔͨ¹ýWHEREÓï¾äÑ¡ÔñҪɾ³ýµÄ¼Ç¼¡£µ«Ö´ÐеÃËٶȲ»¿ì¡£¶øÇÒ»¹¿ÉÒÔ·µ»Ø±»É¾³ýµÄ¼Ç¼Êý¡£¶øTRUNCATE TABLEÎÞ·¨É¾³ýÖ¸¶¨µÄ¼Ç¼£¬¶øÇÒ²»ÄÜ·µ»Ø±»É¾³ýµÄ¼Ç¼¡£µ«ËüÖ´Ðе÷dz£¿ì¡£

Óë±ê×¼µÄSQLÓï¾ä²»Í¬£¬DELETEÖ§³ÖORDER BYºÍLIMIT×Ӿ䣬ͨ¹ýÕâÁ½¸ö×Ӿ䣬ÎÒÃÇ¿ÉÒÔ¸üºÃµØ¿ØÖÆÒªÉ¾³ýµÄ¼Ç¼¡£Èçµ±ÎÒÃÇÖ»Ïëɾ³ýWHERE×Ó¾ä¹ýÂ˳öÀ´µÄ¼Ç¼µÄÒ»²¿·Ö£¬¿ÉÒÔʹÓÃLIMIB£¬Èç¹ûҪɾ³ýºó¼¸Ìõ¼Ç¼£¬¿ÉÒÔͨ¹ýORDER BYºÍLIMITÅäºÏʹÓ᣼ÙÉèÎÒÃÇҪɾ³ýusers±íÖÐnameµÈÓÚ"Mike"µÄǰ6Ìõ¼Ç¼¡£¿ÉÒÔʹÓÃÈçϵÄDELETEÓï¾ä£º

DELETE FROM users WHERE name = 'Mike' LIMIT 6;

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DELETE FROM users WHERE name = 'Mike' ORDER BY id DESC LIMIT 6;


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