U ka etsa tafole ea data joang polokelong ea MySQL? Theha taelo ea tafole ea data / polelo / syntax ho MySQL

MySQL databaseMokhoa oa ho theha tafole ea data?MySQLTheha taelo ea tafole ea data / polelo / syntax ho

MySQL e theha tafole ea data

Ho theha tafole ea data ea MySQL ho hloka lintlha tse latelang:

• Leina la Letlapa
• lebitso la lebala la tafole
• hlalosa lebala le leng le le leng la tafole

sebōpeho-puo

E latelang ke syntax e akaretsang ea SQL bakeng sa ho theha litafole tsa data tsa MySQL:

CREATE TABLE table_name (column_name column_type);

Mohlaleng o latelang re tla theha tafole ea data chenweiliang_tbl polokelong ea polokelo ea chenweiliang:

CREATE TABLE IF NOT EXISTS `chenweiliang_tbl`(
   `chenweiliang_id` INT UNSIGNED AUTO_INCREMENT,
   `chenweiliang_title` VARCHAR(100) NOT NULL,
   `chenweiliang_author` VARCHAR(40) NOT NULL,
   `submission_date` DATE,
   PRIMARY KEY ( `chenweiliang_id` )
)ENGINE=InnoDB DEFAULT CHARSET=utf8;

Tlhahlobo ea mohlala:

• Haeba u sa batle hore tšimo e be teng NULL Thepa ea tšimo e ka behoa e le E SE NULL, ha o sebetsa database, haeba data e kentsoeng tšimong ena eNULL , phoso e tla tlalehoa.
• AUTO_INCREMENT e hlalosoa e le tšobotsi ea ho iphahamisa, e sebelisoang hangata bakeng sa senotlolo sa mantlha, 'me boleng bo tla eketsoa ka 1.
• Lentsoe la bohlokoa la PRIMARY KEY le sebelisoa ho hlalosa kholomo e le senotlolo sa mantlha.U ka sebelisa litšiea tse ngata ho hlalosa senotlolo sa mantlha, se arotsoeng ka lifeheloa.
• ENGINE e beha enjene ea polokelo, 'me CHARSET e beha khouto.

Theha tafole ho tsoa ho taelo ea litaelo

Litafole tsa data tsa MySQL li ka etsoa habonolo ka mysql> fensetere ea litaelo.U ka sebelisa polelo ea SQL QALANG LETLAPA ho theha tafole ea data.

Mohlala

Se latelang ke mohlala oa ho theha tafole ea data chenweiliang_tbl:

root@host# mysql -u root -p
Enter password:*******
mysql> use chenweiliang;
Database changed
mysql> CREATE TABLE chenweiliang_tbl(
   -> chenweiliang_id INT NOT NULL AUTO_INCREMENT,
   -> chenweiliang_title VARCHAR(100) NOT NULL,
   -> chenweiliang_author VARCHAR(40) NOT NULL,
   -> submission_date DATE,
   -> PRIMARY KEY ( chenweiliang_id )
   -> )ENGINE=InnoDB DEFAULT CHARSET=utf8;
Query OK, 0 rows affected (0.16 sec)
mysql>

Tlhokomeliso:Terminator ea taelo ea MySQL ke semicolon (;).

Theha tafole ea data u sebelisa mongolo oa PHP

U ka sebelisa PHP mysqli_query() sebetsa ho theha tafole ea data ho tsoa ho database e teng.

Ts'ebetso e na le liparamente tse peli 'me e khutlisa TRUE haeba ts'ebetso e atlehile, ho seng joalo e khutlisa FALSE.

sebōpeho-puo

mysqli_query(connection,query,resultmode);

Mohlala

Mohlala o latelang o sebelisa sengoloa sa PHP ho theha tafole ea data:

<?
 php
 $dbhost = 'localhost:3306'; // mysql服务器主机地址
 $dbuser = 'root'; // mysql用户名
 $dbpass = '123456'; // mysql用户名密码
 $conn = mysqli_connect($dbhost, $dbuser, $dbpass);
 if(! $conn )
 {
 die('连接失败: ' . mysqli_error($conn));
 }
 echo '连接成功<br />';
 $sql = "CREATE TABLE chenweiliang_tbl( ".
 "chenweiliang_id INT NOT NULL AUTO_INCREMENT, ".
 "chenweiliang_title VARCHAR(100) NOT NULL, ".
 "chenweiliang_author VARCHAR(40) NOT NULL, ".
 "submission_date DATE, ".
 "PRIMARY KEY ( chenweiliang_id ))ENGINE=InnoDB DEFAULT CHARSET=utf8; ";
 mysqli_select_db( $conn, 'chenweiliang' );
 $retval = mysqli_query( $conn, $sql );
 if(! $retval )
 {
 die('数据表创建失败: ' . mysqli_error($conn));
 }
 echo "数据表创建成功\n";
 mysqli_close($conn);
 ?>