MySQL Database

MySQL Database — Skill

Use this skill when working with MySQL or MariaDB databases in Delphi projects via FireDAC.

When to Use

• When configuring FireDAC connection with MySQL or MariaDB
• When creating tables, stored procedures, functions, triggers and views
• When implementing Repositories with FireDAC + MySQL
• When working with native JSON (MySQL 5.7+), Full-Text Search, Partitioning
• When planning schema migrations (versioned scripts)
• When developing web applications with MySQL backend

MySQL Versions

Version	Relevant News
5.7	Native JSON, Generated Columns, sys schema, Group Replication
8.0	Recursive CTEs, Window Functions, DEFAULT (expr), Roles, INVISIBLE indexes, NOWAIT/SKIP LOCKED
8.4 LTS	LTS release, Firewall improvements, Plugin improvements
9.0+	Vector type, JavaScript stored programs (preview)

MariaDB

Version	Relevant News
10.2	Recursive CTEs, Window Functions, DEFAULT (expr)
10.3	INVISIBLE columns, INTERSECT/EXCEPT, Sequences
10.5	INET6 type, JSON_TABLE, S3 storage engine
11.0+	Release Calendar, UUID v7, VECTOR type

Recommendation: Use MySQL 8.0+ or ​​MariaDB 10.5+ for new projects.

FireDAC connection with MySQL

Minimum Configuration

unit MeuApp.Infra.Database.MySQL.Connection;

interface

uses
  FireDAC.Comp.Client,
  FireDAC.Phys.MySQL,       //Driver MySQL
  FireDAC.Phys.MySQLDef,    //Defaults do MySQL
  FireDAC.Stan.Def,
  FireDAC.DApt;

type
  ///<summary>
  ///MySQL connection factory via FireDAC.
  ///</summary>
  TMySQLConnectionFactory = class
  public
    class function CreateConnection(
      const AServer: string;
      const ADatabase: string;
      const AUserName: string = 'root';
      const APassword: string = '';
      APort: Integer = 3306
    ): TFDConnection;
  end;

implementation

uses
  System.SysUtils;

class function TMySQLConnectionFactory.CreateConnection(
  const AServer, ADatabase, AUserName, APassword: string;
  APort: Integer): TFDConnection;
begin
  if ADatabase.Trim.IsEmpty then
    raise EArgumentException.Create('ADatabase não pode ser vazio');

  Result := TFDConnection.Create(nil);
  try
    Result.DriverName := 'MySQL';
    Result.Params.Values['Server'] := AServer;
    Result.Params.Values['Port'] := APort.ToString;
    Result.Params.Database := ADatabase;
    Result.Params.UserName := AUserName;
    Result.Params.Password := APassword;

    { Configurações recomendadas }
    Result.Params.Values['CharacterSet'] := 'utf8mb4';  //ALWAYS utf8mb4 (suporta emoji/4-byte)

    { Opções do driver FireDAC }
    Result.FormatOptions.StrsTrim2Len := True;
    Result.FetchOptions.Mode := fmAll;
    Result.ResourceOptions.AutoReconnect := True;
    Result.TxOptions.Isolation := xiReadCommitted;

    Result.Connected := True;
  except
    Result.Free;
    raise;
  end;
end;