Ungabuka kanjani imininingwane yedatha yedatha yesimo kanye nenombolo yedatha yesizindalwazi se-MySQL?

MySQL imethadatha

Ungase ufune ukwazi izinhlobo ezintathu ezilandelayo zolwazi mayelana ne-MySQL:

• Ulwazi lomphumela wombuzo: Inombolo yamarekhodi athintwa isitatimende esithi KHETHA, BUYEKEZA noma SUSA.
• Ulwazi mayelana nezizindalwazi namathebula edatha: Iqukethe ulwazi lwesakhiwo sesizindalwazi kanye nethebula ledatha.
• Ulwazi lweseva ye-MySQL: Iqukethe isimo samanje seseva yesizindalwazi, inombolo yenguqulo, njll.

Emyalweni womyalo we-MySQL, singathola kalula imininingwane yeseva engenhla.Kodwa uma usebenzisa ulimi lokubhala olufana ne-Perl noma i-PHP, udinga ukubiza umsebenzi othile wokuxhumana ukuze uwuthole.Okulandelayo sizokwethula ngokuningiliziwe.

Thola inombolo yamarekhodi athintwa isitatimende sombuzo

Isibonelo se-PERL

Kumaskripthi e-DBI, inani lamarekhodi athintwa isitatimende libuyiselwa imisebenzi do( ) noma khipha ( ):

# 方法 1
# 使用do( ) 执行  $query 
my $count = $dbh->do ($query);
# 如果发生错误会输出 0
printf "%d 条数据被影响\n", (defined ($count) ? $count : 0);
# 方法 2
# 使用prepare( ) 及 execute( ) 执行  $query 
my $sth = $dbh->prepare ($query);
my $count = $sth->execute ( );
printf "%d 条数据被影响\n", (defined ($count) ? $count : 0);

Isibonelo se-PHP

Ku-PHP, ungasebenzisa umsebenzi we-mysqli_affected_rows() ukuze uthole inani lamarekhodi athintwe umbuzo.

$result_id = mysqli_query ($conn_id, $query);
# 如果查询失败返回 
$count = ($result_id ? mysqli_affected_rows ($conn_id) : 0);
print ("$count 条数据被影响\n");

Uhlu lwemininingwane namathebula edatha

Ungathola kalula uhlu lwemininingwane namathebula kuseva ye-MySQL.Uma ungenazo izimvume ezanele, umphumela uzobuya ungenalutho.
Ungasebenzisa futhi isitatimende esithi SHOW TABLES noma SHOW DATABASES ukuze uthole uhlu lwezizindalwazi namathebula edatha.

Isibonelo se-PERL

# 获取当前数据库中所有可用的表。
my @tables = $dbh->tables ( );
foreach $table (@tables ){
   print "表名 $table\n";
}

Isibonelo se-PHP

Isibonelo esilandelayo sikhipha yonke imininingwane yolwazi kuseva ye-MySQL:

<?
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));
}
// 设置编码，防止中文乱码
$db_list = mysqli_query($conn, 'SHOW DATABASES');
while ($db = mysqli_fetch_object($db_list))
{
 echo $db->Database . "<br />";
}
mysqli_close($conn);
?>

Thola imethadatha yeseva

Izitatimende zomyalo ezilandelayo zingasetshenziswa kumyalo womyalo we-MySQL noma kumaskripthi, njengemibhalo ye-PHP.