MySQL教程DML数据操纵语言示例详解

1.鏁版嵁鎿嶇旱璇�瑷�(DML)

鏁版嵁鎿嶇旱璇�瑷�鍏ㄧО鏄疍ata Manipulation Language锛岀畝绉版槸DML銆侱ML涓昏�佹湁鍥涗釜甯哥敤鍔熻兘锛屽�備笅琛ㄦ墍绀猴紝鍏朵腑DML涓�鐨勬煡璇㈠姛鑳芥槸浣滀负涓�鍚嶆暟鎹�鍒嗘瀽甯堝父鐢ㄧ殑鎿嶄綔銆傛煡璇㈢煡璇嗕細绌挎彃鍦ㄤ箣鍚庣殑鎵�鏈夋枃绔犱腑璁茶堪锛屽洜涓鸿繖涓�闂�棰樹笉鏄�涓�涓嬪瓙鍙�浠ヨ�茬殑瀹岀殑銆備粖澶╃殑鏂囩珷涓昏�佹槸璁茶堪澧炪�佸垹銆佹敼杩欏嚑涓�鎶�鑳界殑鐢ㄦ硶銆?/p>

澧?/th>	鍒?/th>	鏀?/th>	鏌?/th>
insert	delete	update	select

涓嬮潰鐨勬搷浣滈兘鏄�鍩轰簬杩欎釜student琛ㄨ繘琛岀殑銆?/p>

# 鍒涘缓鏁版嵁搴?
create database if not exists stu;
# 浣跨敤鏁版嵁搴?
use stu;
# 鍒涘缓涓�涓�琛�
create table student(
    sid int primary key auto_increment,
    sname varchar(20) not null,
    sex varchar(10)
)charset=utf8;

2.澧炴坊鏁版嵁(insert)

鎯呭喌涓�锛氱粰鍏ㄩ儴瀛楁�垫坊鍔犳暟鎹�锛?
-- 鏈変互涓嬩袱绉嶆坊鍔犳柟寮忥細褰撶粰鎵�鏈夊瓧娈垫彃鍏ユ暟鎹�鐨勬椂鍊欙紝鍙�浠ヤ笉鍐欏瓧娈靛悕銆?
insert into student(sid,sname,sex) values (1,"寮犱笁","鐢?);
insert into student values (2,"鏉庤帀","濂?);

鎯呭喌浜岋細缁欓儴鍒嗗瓧娈垫坊鍔犳暟鎹�锛�
insert into student(sname) values ("鐜嬩簲");
insert into student(sname,sex) values ("璧靛叚","鐢?);

鎯呭喌涓夛細涓�娆℃�ф彃鍏ュ�氭潯鏁版嵁锛�
insert into student(sname,sex) values 
("鍒樺��","鐢?),("璨傝潐","濂?),("璇歌憶浜?,"鐢?);

缁撴灉濡備笅锛?/p>

3.澶嶅埗宸叉湁琛�锛岀敓鎴愭柊琛�

1锛夊�嶅埗宸叉湁琛ㄧ殑缁撴瀯鍜屾暟鎹�銆?/h3>

"鍒涘缓涓�涓猻tudent1琛�锛岃〃鐨勭粨鏋勫拰鏁版嵁鍧囨潵鑷�浜巗tudent琛ㄣ�?
mysql> create table student1 select * from student;

鎿嶄綔缁撴灉濡備笅锛?/p>

2锛夊彧澶嶅埗宸叉湁琛ㄧ殑缁撴瀯(寰楀埌鐨勬槸涓�涓�绌虹粨鏋勮�?銆?/h3>

"鍒涘缓涓�涓猻tudent2琛�锛屽彧澶嶅埗student琛ㄧ殑缁撴瀯锛屼笉瑕侀噷闈㈢殑鏁版嵁銆?
mysql> create table student2 select * from student where 0;

鎿嶄綔缁撴灉濡備笅锛?/p>

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3锛夊湪2鐨勫熀纭�涓婏紝鍚戠┖缁撴瀯琛ㄤ腑鎻掑叆鏁版嵁銆?/h3>

"鍦?鍩虹��涓婏紝鍚憇tudent2琛ㄤ腑鎻掑叆鏁版嵁锛屾暟鎹�鏉ヨ嚜浜巗tudent琛?
mysql> insert into student2 select * from student;

鎿嶄綔缁撴灉濡備笅锛?/p>

4.淇�鏀规暟鎹畊pdate

update鍜宒elete璇�鍙ヨ�侀厤鍚坵here绛涢�?杩涜�屼娇鐢�,鍚﹀垯鍒犻櫎鐨勫氨鏄�鏁村紶琛ㄧ殑璁板綍銆?/p>

"璇�娉曟牸寮忥細澶氫釜鍒椾箣闂寸敤閫楀彿闅斿紑"
update 琛ㄥ悕 set 鍒?=鍊? [鍒?=鍊?,鍒?=鍊?鈥︹�?] where鏉′欢;

"婕旂ず绀轰緥濡備笅"
-- 鎶妔id涓?鐨勭帇浜旂殑濮撳悕锛屾敼涓虹帇鍏�銆?
update student set sname="鐜嬪叓" where sid = 3;
-- 鎶妔id涓?鐨勮�歌憶浜�鐨勫悕瀛楁敼涓哄瓟鏄庯紝鎬у埆鏀逛负鐚涚敺銆?
update student set sname="瀛旀槑",sex="鐚涚敺" where sid=7;

鎿嶄綔缁撴灉濡備笅锛?/p>

5.鍒犻櫎鏁版嵁delete锛氱墿鐞嗗垹闄?涓�鏃﹀垹闄ゅ氨褰诲簳娌℃湁浜?銆?/h2>

update鍜宒elete璇�鍙ヨ�侀厤鍚坵here绛涢�?杩涜�屼娇鐢�,鍚﹀垯鍒犻櫎鐨勫氨鏄�鏁村紶琛ㄧ殑璁板綍銆?/p>

"璇�娉曟牸寮忥�?
delete from 琛ㄥ悕 where 鏉′欢;

"婕旂ず绀轰緥濡備笅"
delete from student where sname="寮犱笁";

鎿嶄綔缁撴灉濡備笅锛?/p>

6.truncate鍜宒elete鐨勫尯鍒?/h2>

鐢ㄥ�備笅鏁版嵁璁茶堪杩欎袱涓�鐨勫尯鍒�锛�

1锛塪elete

2锛塼runcate

3锛塼runcate鍜宒elete鐨勫尯鍒?/h3>

鈶?閮芥槸涓嶄慨鏀圭粨鏋勶紝鍙�娓呴櫎鏁版嵁銆?br /> 鈶?delete鍒犻櫎涓嶉噴鏀捐祫婧愶紝truncate閲婃斁琛ㄥ崰鐢ㄧ殑绌洪棿(浼氶噸缃�涓婚敭鑷�澧?
鈶?delete鏄�閫愯�屽垹闄わ紝鍒犻櫎璁板綍鏄�浣滀负浜嬪姟璁板綍鍦ㄦ棩蹇楁枃浠朵腑锛屽彲杩涜�屽洖婊氭搷浣溿�倀runcate涓�娆℃�у垹闄よ〃涓�鎵�鏈夋暟鎹�锛屽垹闄よ�板綍涓嶄細璁板綍鍦ㄦ棩蹇楁枃浠朵腑锛屾棤娉曟仮澶嶏紝鍒犻櫎鏁堢巼楂樹簬delete銆?/p>

浠ヤ笂灏辨槸MySQL鏁欑▼DML鏁版嵁鎿嶇旱璇�瑷�绀轰緥璇﹁В鐨勮�︾粏鍐呭�癸紝鏇村�氬叧浜嶥ML鏁版嵁鎿嶇旱璇�瑷�鐨勮祫鏂欒�峰叧娉ㄨ剼鏈�涔嬪�跺叾瀹冪浉鍏虫枃绔狅�?/p>