perl - 使用“DROP TABLE IF EXISTS”的 DBI 语法错误

Question

我从数据库世界开始。我正在尝试制作一个 Perl 脚本来从 SQLite3 中的数据库中获取一些数据。我要做的第一步是删除现有表，然后使用新数据创建另一个表。我的代码是：

#!/usr/bin/perl

use DBI;
use strict;

my $driver   = "SQLite"; 
my $database = "/media/My\ Passport/Sources/M5nr_db";
my $dsn = "DBI:$driver:dbname=$database";
my $userid = "";
my $password = "";
my $dbh = DBI->connect($dsn, $userid, $password, { RaiseError => 1 }) 
                      or die $DBI::errstr;

print "Opened database successfully\n";
my $stmt = qq(DROP TABLE IF EXISTS matching_prot );
my $rv = $dbh->do($stmt);
my $stmt = qq(CREATE TABLE matching_prot
    (Seq_ID TEXT,
     M5 TEXT,
     Identity REAL
     Evalue REAL
     Bit_score INT););
my $rv = $dbh->do($stmt);

$dbh->disconnect();

但我收到以下错误：

Opened database successfully
DBD::SQLite::db do failed: near "EXISTS": syntax error(1) at dbdimp.c line 269 at use_database.pl line 16.
DBD::SQLite::db do failed: near "EXISTS": syntax error(1) at dbdimp.c line 269 at use_database.pl line 16.

在 sqlite3 命令行中它工作正常。有任何想法吗？

嗯，提前谢谢。

Answer 1

删除第二个；

     Bit_score INT););