使用「DROP TABLE IF EXISTS」的DBI語法錯誤

Question

我開始了數據庫的世界。我試圖讓一個Perl腳本從SQLite3中的數據庫中獲取一些數據。我想要做的第一步是刪除現有的表格，然後用新的數據創建另一個表格。我的代碼是：

#!/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(); 

，但我得到了以下錯誤：

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的命令行，它工作正常。有任何想法嗎？

嗯，在此先感謝。

Answer 1

刪除第二個;

 Bit_score INT););