MySqlConnection =新的MySqlConnection(字符串)不起作用 [英] MySqlConnection = new MySqlConnection(string) not working

问题描述

这是我在Visual Studio中连接到Unity3d的代码:

Here is my code in Visual Studio connected to Unity3d:

public void SetupSQLConnection()
{
    Debug.Log("Connection Function Started");
    if (connection == null)
    {
        Debug.Log("If connection == null");
        try
        {
            Debug.Log("Try block started");
            string connectionString = "Server=localhost;" + "Database=therapygame;" + "UID=root;" + "Password=;";
            Debug.Log("string set");
            connection = new MySqlConnection(connectionString);
            Debug.Log("new MySqlConnection");
            connection.Open();
            Debug.Log("connection");
        }
        catch (MySqlException ex)
        {
            Debug.LogError("MySQL Error: " + ex.ToString());
        }
    }
}

控制台字符串将一直打印到字符串集"，但是其余的将不会打印.

The Console strings get printed all the way to "string set", but then the rest do not print.

这是Unity中的错误:

Here is the error in Unity:

KeyNotFoundException:给定的密钥不存在于 字典. System.Collections.Generic.Dictionary`2 [System.String，System.Object] .get_Item (System.String键)(在 /Users/builduser/buildslave/mono/build/mcs/class/corlib/System.Collections.Generic/Dictionary.cs:150) MySql.Data.MySqlClient.MySqlConnectionStringBuilder.get_Database() MySql.Data.MySqlClient.MySqlConnection.set_ConnectionString (System.String值)MySql.Data.MySqlClient.MySqlConnection..ctor (System.String connectionString)(包装带检查的远程调用) MySql.Data.MySqlClient.MySqlConnection:.ctor(字符串) mysql.SetupSQLConnection()(位于Assets/mysql.cs:31)fire_rate.Start() (位于Assets/fire_rate.cs:18)

KeyNotFoundException: The given key was not present in the dictionary. System.Collections.Generic.Dictionary`2[System.String,System.Object].get_Item (System.String key) (at /Users/builduser/buildslave/mono/build/mcs/class/corlib/System.Collections.Generic/Dictionary.cs:150) MySql.Data.MySqlClient.MySqlConnectionStringBuilder.get_Database () MySql.Data.MySqlClient.MySqlConnection.set_ConnectionString (System.String value) MySql.Data.MySqlClient.MySqlConnection..ctor (System.String connectionString) (wrapper remoting-invoke-with-check) MySql.Data.MySqlClient.MySqlConnection:.ctor (string) mysql.SetupSQLConnection () (at Assets/mysql.cs:31) fire_rate.Start () (at Assets/fire_rate.cs:18)

推荐答案

@Dhansushka Dayawansha

@Dhansushka Dayawansha

我实施了您的更改，但收到了一个新错误.我很高兴我克服了第一个错误！我尝试自己寻找解决此新错误的方法无济于事.这是控制台输出:

I implemented your change and I received a new error. I'm happy that I got past the first error! I tried looking for solutions to this new error myself to no avail. Here is the console output:

NullReferenceException: Object reference not set to an instance of an object
System.Data.Common.DbConnectionStringBuilder.Remove (System.String keyword)
MySql.Data.MySqlClient.MySqlConnectionStringBuilder.Remove (System.String keyword)
MySql.Data.MySqlClient.MySqlConnectionStringOption.Clean (MySql.Data.MySqlClient.MySqlConnectionStringBuilder builder)
MySql.Data.MySqlClient.MySqlConnectionStringBuilder.SetValue (System.String keyword, System.Object value)
MySql.Data.MySqlClient.MySqlConnectionStringOption.<.ctor>b__0 (MySql.Data.MySqlClient.MySqlConnectionStringBuilder msb, MySql.Data.MySqlClient.MySqlConnectionStringOption sender, System.Object value)
MySql.Data.MySqlClient.MySqlConnectionStringBuilder.set_Item (System.String keyword, System.Object value)
MySql.Data.MySqlClient.MySqlConnectionStringBuilder.set_Server (System.String value)
mysql.SetupSQLConnection () (at Assets/mysql.cs:31)
fire_rate.Start () (at Assets/fire_rate.cs:18)

mysql.cs的第31行:

Line 31 of mysql.cs:

connBuilder.Server = "localhost";

fire_rate.cs的第18行:

Line 18 of fire_rate.cs:

GameObject.Find("MySQL").GetComponent<mysql>().SetupSQLConnection();

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