Migration Mysql to Sqlite with Delphi

First Step create the same scheme on SQLite as MySQL

To create the same schema in SQLite as the one in MySQL, you can follow these steps:

1. Use a tool like MySQL Workbench to generate a SQL script that creates the schema of your MySQL database.
2. Open the SQL script in a text editor and modify it to use SQLite syntax instead of MySQL syntax. Some changes you may need to make include:

• Replace CREATE DATABASE with ATTACH DATABASE.
• Remove ENGINE clauses from CREATE TABLE statements, as SQLite does not support specifying storage engines.
• Replace data types that are not supported in SQLite, such as ENUM and SET.

1. Save the modified SQL script as a .sql file.
2. Use the TSQLite3Database component in Delphi to connect to your SQLite database.

SQLiteConnection := TSQLite3Database.Create(nil);

SQLiteConnection.DatabaseName := ‘MyDatabase.sqlite’;

SQLiteConnection.Open;

1. Use the TSQLite3Query component to execute the SQL script.

SQLiteQuery := TSQLite3Query.Create(nil);

SQLiteQuery.Database := SQLiteConnection;

SQLiteQuery.SQL.LoadFromFile(‘MySqlSchema.sql’);

SQLiteQuery.ExecSQL;

1. Close the connection and free the components.

SQLiteQuery.Close;

SQLiteConnection.Close;

SQLiteQuery.Free;

SQLiteConnection.Free;

Note that you may need to make additional modifications to the SQL script to ensure compatibility with SQLite. It’s a good idea to test the migration on a small subset of your data first before migrating the entire database.

Migrating data from MySQL to SQLite can be done using several approaches, such as exporting data from MySQL and importing it into SQLite or using third-party tools. In Delphi programming language, you can use the following steps to migrate data from MySQL to SQLite:

1. Connect to MySQL database using TMySQLDatabase component.

Here’s an example of how to connect to a MySQL database:

MySQLConnection := TMySQLDatabase.Create(nil);

MySQLConnection.DatabaseName := ‘MyDatabase’;

MySQLConnection.HostName := ‘localhost’;

MySQLConnection.UserName := ‘root’;

MySQLConnection.Password := ‘password’;

MySQLConnection.Open;

1. Connect to SQLite database using TSQLite3Database component.

Here’s an example of how to connect to a SQLite database:

SQLiteConnection := TSQLite3Database.Create(nil);

SQLiteConnection.DatabaseName := ‘MyDatabase.sqlite’;

SQLiteConnection.Open;

1. Retrieve data from MySQL database using TMySQLQuery component.

Here’s an example of how to retrieve data from a MySQL database:

MySQLQuery := TMySQLQuery.Create(nil);

MySQLQuery.Database := MySQLConnection;

MySQLQuery.SQL.Text := ‘SELECT * FROM MyTable’;

MySQLQuery.Open;

1. Iterate through the records and insert them into the SQLite database using TSQLite3Query component.

Here’s an example of how to insert data into a SQLite database:

SQLiteQuery := TSQLite3Query.Create(nil);

SQLiteQuery.Database := SQLiteConnection;

SQLiteQuery.SQL.Text := ‘INSERT INTO MyTable (Field1, Field2) VALUES (:Field1, :Field2)’;

while not MySQLQuery.Eof do

begin

SQLiteQuery.ParamByName(‘Field1’).Value := MySQLQuery.FieldByName(‘Field1’).Value;

SQLiteQuery.ParamByName(‘Field2’).Value := MySQLQuery.FieldByName(‘Field2’).Value;

SQLiteQuery.ExecSQL;

MySQLQuery.Next;

end;

1. Close the connections and free the components.

Here’s an example of how to close the connections and free the components:

MySQLQuery.Close;

MySQLConnection.Close;

MySQLQuery.Free;

MySQLConnection.Free;

SQLiteQuery.Close;

SQLiteConnection.Close;

SQLiteQuery.Free;

SQLiteConnection.Free;

Note that this is a basic example of how to migrate data from MySQL to SQLite using Delphi. You may need to modify the code to suit your specific needs.