How Can I Convert SQLite3 Databases to MySQL Effectively?

Converting SQLite3 to MySQL: A Step-by-Step Method

Migrations between SQLite3 and MySQL can be challenging due to syntactic differences. Despite numerous attempts to create dedicated libraries, finding a reliable conversion tool remains an issue.

To ensure accurate data transfer, it's crucial to understand the syntax variations between the two formats. Here are some key distinctions:

• Transaction Commands: SQLite3 utilizes BEGIN TRANSACTION/COMMIT, while MySQL does not require them.
• Unique Index Creation: CREATE UNIQUE INDEX is specific to SQLite3 and is not used in MySQL.
• Quotation Marks: MySQL doesn't use quotation marks in schema definitions or string values within INSERT INTO clauses.
• Boolean Handling: SQLite3 uses 't' and 'f' for boolean values, while MySQL employs 1 and 0.
• Auto-Increment: SQLite3 uses AUTOINCREMENT, whereas MySQL uses AUTO_INCREMENT.

A Solution with Perl Script:

As a workaround, the following Perl script offers a basic conversion method that addresses various syntax differences:

#! /usr/bin/perl

while ($line = <>){
    if (($line !~  /BEGIN TRANSACTION/) &amp;&amp; ($line !~ /COMMIT/) &amp;&amp; ($line !~ /sqlite_sequence/) &amp;&amp; ($line !~ /CREATE UNIQUE INDEX/)){
        
        if ($line =~ /CREATE TABLE \&quot;([a-z_]*)\&quot;(.*)/i){
            $name = ;
            $sub = ;
            $sub =~ s/\&quot;//g;
            $line = &quot;DROP TABLE IF EXISTS $name;\nCREATE TABLE IF NOT EXISTS $name$sub\n&quot;;
        }
        elsif ($line =~ /INSERT INTO \&quot;([a-z_]*)\&quot;(.*)/i){
            $line = &quot;INSERT INTO \n&quot;;
            $line =~ s/\&quot;/\\&quot;/g;
            $line =~ s/\&quot;/\'/g;
        }else{
            $line =~ s/\'\'/\\'/g;
        }
        $line =~ s/([^\'])\'t\'(.)/THIS_IS_TRUE/g;
        $line =~ s/THIS_IS_TRUE/1/g;
        $line =~ s/([^\'])\'f\'(.)/THIS_IS_FALSE/g;
        $line =~ s/THIS_IS_FALSE/0/g;
        $line =~ s/AUTOINCREMENT/AUTO_INCREMENT/g;
        print $line;
    }
}

While this script is tailored to a specific dataset, it can serve as a starting point for modifications to fit your specific needs. Carefully review the syntax differences and adjust the script accordingly to ensure successful data transfer from SQLite3 to MySQL.

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