EF6 MySql：Update-Database-ScriptはセミコロンなしでSQLを生成します

これは、MySqlMigrationSqlGeneratorを次のように拡張することで実現できます。

/// <summary>
/// Custom MigrationSqlGenerator to add semi-colons to the end of 
/// all migration statements.
/// </summary>
public class CustomMySqlMigrationSqlGenerator : MySqlMigrationSqlGenerator {
    public override IEnumerable<MigrationStatement> Generate(IEnumerable<MigrationOperation> migrationOperations, string providerManifestToken) {
        IEnumerable<MigrationStatement> statements = base.Generate(migrationOperations, providerManifestToken);
        foreach (MigrationStatement statement in statements) {
            if (!statement.Sql.EndsWith(";")) {
                statement.Sql = statement.Sql.TrimEnd() + ";";
            }
        }
        return statements;
    }
}

そして、Configuration.csで有効にします ：

public Configuration() {
    AutomaticMigrationsEnabled = false;
    SetSqlGenerator("MySql.Data.MySqlClient", new CustomMySqlMigrationSqlGenerator());
}