U ka sheba boemo le tlhahisoleseling ea sebopeho sa tafole ea nomoro ea data ea database ea MySQL joang?

MySQL metadata

U kanna ua batla ho tseba mefuta e meraro e latelang ea tlhaiso-leseling ka MySQL:

• Lintlha tsa sephetho sa potso: Palo ea lirekoto tse anngoeng ke polelo ea KHETHA, UPDATE kapa DELETE.
• Lintlha mabapi le li-database le litafole tsa data: E na le tlhaiso-leseling ea sebopeho sa database le tafole ea data.
• Lintlha tse mabapi le seva sa MySQL: E na le boemo ba hajoale ba seva sa database, nomoro ea mofuta, joalo-joalo.

Ka potlako ea taelo ea MySQL, re ka fumana lintlha tse ka holimo tsa seva habonolo.Empa haeba u sebelisa puo ea mongolo e kang Perl kapa PHP, u lokela ho letsetsa sebopeho se itseng sa sebopeho ho e fumana.E latelang re tla hlahisa ka ho qaqileng.

Fumana palo ea lirekoto tse anngoeng ke polelo ea potso

Mohlala oa PERL

Lingoliloeng tsa DBI, palo ea lirekoto tse anngoeng ke polelo e khutlisoa ke mesebetsi do( ) kapa e phethise( ):

# 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);

Mohlala oa PHP

Ho PHP, o ka sebelisa mysqli_affected_rows() ts'ebetso ho fumana palo ea lirekoto tse anngoeng ke potso.

$result_id = mysqli_query ($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");

Lenane la li-database le litafole tsa data

U ka fumana lethathamo la li-database le litafole habonolo ho seva sa MySQL.Haeba u sena litumello tse lekaneng, sephetho se tla khutla.
U ka boela ua sebelisa polelo ea SHOW TABLES kapa SHOW DATABASES ho fumana lethathamo la li-database le litafole tsa data.

Mohlala oa 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";
}

Mohlala oa PHP

Mohlala o latelang o hlahisa li-database tsohle ho seva sa 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);
?>

Fumana metadata ea seva

Lipolelo tse latelang tsa taelo li ka sebelisoa ho MySQL command prompt kapa lingolong, joalo ka lingoloa tsa PHP.