How Can I Efficiently Migrate My SQLite3 Database to MySQL?

Efficient MySQL Migration from SQLite3

Migrating data from SQLite3 to MySQL can be a daunting task, especially without the right tools. To address this challenge, this article provides a comprehensive overview of the key differences between SQLite3 and MySQL syntax, followed by a sample Perl script that facilitates the conversion process.

Syntax Disparities

To ensure a seamless migration, several syntax differences must be accounted for, including:

• SQLite3's BEGIN TRANSACTION, COMMIT, sqlite_sequence, and CREATE UNIQUE INDEX do not exist in MySQL.
• Table creation in SQLite3 uses CREATE TABLE/INSERT INTO "table_name", while MySQL employs CREATE TABLE/INSERT INTO table_name without quotes.
• Schema definitions in MySQL do not require quotes.
• MySQL utilizes single quotes for strings within INSERT INTO clauses, unlike SQLite3's double quotes.
• String escaping methods differ between the two databases.
• SQLite3 represents booleans as 't' and 'f', whereas MySQL uses 1 and 0.
• SQLite3's AUTOINCREMENT keyword aligns with MySQL's AUTO_INCREMENT syntax.

Sample Perl Script

The following Perl script addresses many of these syntax discrepancies and can be customized for specific datasets:

#! /usr/bin/perl

while ($line = ){
    if (($line !~  /BEGIN TRANSACTION/) && ($line !~ /COMMIT/) && ($line !~ /sqlite_sequence/) && ($line !~ /CREATE UNIQUE INDEX/)){
        
        if ($line =~ /CREATE TABLE \"([a-z_]*)\"(.*)/i){
            $name = ;
            $sub = ;
            $sub =~ s/\"//g;
            $line = "DROP TABLE IF EXISTS $name;\nCREATE TABLE IF NOT EXISTS $name$sub\n";
        }
        elsif ($line =~ /INSERT INTO \"([a-z_]*)\"(.*)/i){
            $line = "INSERT INTO \n";
            $line =~ s/\"/\\"/g;
            $line =~ s/\"/\'/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;
    }
}

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