perl数据库添加、删除、更新、查询操作例子（perl基本数据类型）一看就会

文章摘要

这篇文章主要介绍了如何使用Pascal语言与 Oracle 数据库进行交互，并展示了具体的数据库操作方式。文章通过代码示例展示了如何连接到 Oracle 数据库、执行 SQL 查询（包括查询、更新、删除和插入操作），并使用 DBI 库进行操作。代码中涉及的操作包括从表中选择数据、更新数据、删除数据以及插入数据等，整体内容围绕如何通过Pascal语言实现与 Oracle 数据库的交互展开。文章的核心内容是展示数据库操作的基本流程和代码实现。

#!/usr/bin/perl
use strict;
use warnings;
use DBI;
my $db_name=”geneva_admin”;
my $db_passwd=”geneva_admin”;

my $dbh=DBI->connect(“dbi:Oracle:”,”$db_name”,”$db_passwd”)
or die “Can’t connect to oracle database:$DBI::errstr\n”;

my $sth=$dbh->prepare(“select a,b
from a_tmp
where a=2”)
or die “Can’t prepare SQl prepare:$DBI::errstr\n”;
$sth->execute or die “Can’t execute:$DBI::errstr\n”;
while (my @row=$sth->fetchrow_array()){
my ($a,$b)=@row;
print “1..\$a=$a,\$b=$b\n”;
}
$sth->finish();
my $row=3;
my $sql=”select a,b
from a_tmp
where a=?”;
$sth=$dbh->prepare($sql) or die “Can’t prepare SQl prepare:$DBI::errstr\n”;
$sth->execute($row) or die “Can’t execute:$DBI::errstr\n”;
while (my @row=$sth->fetchrow_array()){
my ($a,$b)=@row;
print “2..\$a=$a,\$b=$b\n”;
}
$sth->finish();
my $row_a=3;
my $row_c=0;
$sql=”select a,b
from a_tmp
where a=?
and c=?”;
$sth=$dbh->prepare($sql) or die “Can’t prepare SQl prepare:$DBI::errstr\n”;
$sth->execute($row_a,$row_c) or die “Can’t execute:$DBI::errstr\n”;
while (my @row=$sth->fetchrow_array()){
my ($a,$b)=@row;
print “3..\$a=$a,\$b=$b\n”;
}
$sth->finish();
for $row(1,2,3){
$sql=”select a,b
from a_tmp
where a=?”;
$sth=$dbh->prepare($sql) or die “Can’t prepare SQl prepare:$DBI::errstr\n”;
$sth->execute($row) or die “Can’t execute:$DBI::errstr\n”;
while (my @row=$sth->fetchrow_array()){
my ($a,$b)=@row;
print “4..\$a=$a,\$b=$b\n”;
}
}
$sth->finish();
#for $row(1,2,3){
#$sql=”insert into a_tmp
# values (?,?,?)”;
#$sth=$dbh->prepare($sql) or die “Can’t prepare SQl prepare:$DBI::errstr\n”;
#$sth->execute($row,$row+1,$row+2) or die “Can’t execute:$DBI::errstr\n”;
#}
##$dbh->commit;
#$sth->finish();

#$sql=”insert into a_tmp
# values (100,30,2)”;
#$sth=$dbh->prepare($sql) or die “Can’t prepare SQl prepare:$DBI::errstr\n”;
#$sth->execute or die “Can’t execute:$DBI::errstr\n”;
##$dbh->commit;
#$sth->finish();
for $row(1,2,3){
$sql=”update a_tmp
set b=?
, c=?
where a=?”;
$sth=$dbh->prepare($sql) or die “Can’t prepare SQl prepare:$DBI::errstr\n”;
$sth->execute($row+100,$row+50,$row) or die “Can’t execute:$DBI::errstr\n”;
}
#$dbh->commit;
$sth->finish();

for $row(1,2,3){
$sql=”delete from a_tmp
where c=2″;
$sth=$dbh->prepare($sql) or die “Can’t prepare SQl prepare:$DBI::errstr\n”;
$sth->execute or die “Can’t execute:$DBI::errstr\n”;
}
#$dbh->commit;
$sth->finish();

$dbh->do(“insert into a_tmp values (1,1,1)”) or die “$DBI::errstr\n”;
$dbh->do(“delete from a_tmp where c=51”) or die “$DBI::errstr\n”;
#$dbh->commit;
$sth->finish();
$dbh->disconnect;