c# - 在c#中定义两个带外键的表

Question

我想制作 2 个表格:团队和项目 我想在这两者之间建立 1:n 的关系。 这是我的代码: //创建 tabela 项目

    public void CreareTabelaProjects() {
        string query = "CREATE TABLE IF NOT EXISTS Projects" + "(" + "id_project MEDIUMINT PRIMARY KEY AUTO_INCREMENT," + "name VARCHAR(30)," +
            "description VARCHAR(30)," + "FOREIGN KEY (team_id) REFERENCES Teams(team_id)" + ");";
        if (this.OpenConnection() == true) {
            MySqlCommand cmd = new MySqlCommand(query, connection);
            cmd.ExecuteNonQuery();
            this.CloseConnection();
        }
    }

   //Creare tabela Teams

    public void CreareTabelaTeams() {
        string query = "CREATE TABLE IF NOT EXISTS Teams" + "(" + "team_id INT AUTO_INCREMENT PRIMARY KEY," + "name VARCHAR(30)" + ");";
        if (this.OpenConnection() == true)
        {
            MySqlCommand cmd = new MySqlCommand(query, connection);
            cmd.ExecuteNonQuery();
            this.CloseConnection();
        }

    }

当我运行此命令时，发生错误: 表中不存在键列“team_id”。该应用程序仅创建团队表。有什么帮助吗？谢谢!

Answer 1

在第一个表之前创建第二个表