Unity 3D 连接Mysql数据库

using UnityEngine;  
using System;  
using System.Data;  
using System.Collections;   
using MySql.Data.MySqlClient;
using MySql.Data;
using System.IO;
public class SqlAccess 
{
    public static MySqlConnection dbConnection;
    //如果只是在本地的话，写localhost就可以。
    // static string host = "localhost";  
    //如果是局域网，那么写上本机的局域网IP
    static string host = "127.0.0.1";  
    static string id = "root";
    static string pwd = "123456";
    static string database = "test"; 
    
    public SqlAccess()
    {
        OpenSql();
    }


    public static void OpenSql()
    {
        try
        {
            string connectionString = string.Format("Server = {0};port={4};Database = {1}; User ID = {2}; Password = {3};",host,database,id,pwd,"3306");
            dbConnection = new MySqlConnection(connectionString);
            dbConnection.Open(); 
        }catch (Exception e)
        {
            throw new Exception("服务器连接失败，请重新检查是否打开MySql服务。" + e.Message.ToString());  
        }
    }
    
    public DataSet CreateTable (string name, string[] col, string[] colType)
    {
        if (col.Length != colType.Length) 
        {
            throw new Exception ("columns.Length != colType.Length");
        }
        string query = "CREATE TABLE " + name + " (" + col[0] + " " + colType[0];
        for (int i = 1; i < col.Length; ++i) 
        {
            query += ", " + col[i] + " " + colType[i];
        }
        query += ")";
        return  ExecuteQuery(query);
    }
    
    public DataSet CreateTableAutoID (string name, string[] col, string[] colType)
    {
        if (col.Length != colType.Length) 
        {
            throw new Exception ("columns.Length != colType.Length");
        }
        string query = "CREATE TABLE " + name + " (" + col[0] + " " + colType[0] +  " NOT NULL AUTO_INCREMENT";
        for (int i = 1; i < col.Length; ++i) 
        {    
            query += ", " + col[i] + " " + colType[i];
        }
        query += ", PRIMARY KEY ("+ col[0] +")" + ")";
        Debug.Log(query);
        return  ExecuteQuery(query);
    }
    
    //插入一条数据，包括所有，不适用自动累加ID。
    public DataSet InsertInto (string tableName, string[] values)
    {
        string query = "INSERT INTO " + tableName + " VALUES (" + "‘"+ values[0]+ "‘";
        for (int i = 1; i < values.Length; ++i) 
        {
            query += ", " + "‘"+values[i]+ "‘";
        }
        query += ")";
        Debug.Log(query);
        return ExecuteQuery (query);
    }

    //插入部分ID
    public DataSet InsertInto (string tableName, string[] col,string[] values)
    {
        if (col.Length != values.Length) 
        {
            throw new Exception ("columns.Length != colType.Length");
        }
        string query = "INSERT INTO " + tableName + " (" + col[0];
        for (int i = 1; i < col.Length; ++i) 
        {
            query += ", "+col[i];
        }
        query += ") VALUES (" + "‘"+ values[0]+ "‘";
        for (int i = 1; i < values.Length; ++i) 
        {
            query += ", " + "‘"+values[i]+ "‘";
        }
        query += ")";
        Debug.Log(query);
        return ExecuteQuery (query);
    }
　　　//读取表的数据
    public DataSet SelectAll(string Name)
    {
        string query ="select * from "+" "+Name;
        return ExecuteQuery (query);
    }
　　//条件读取
    public DataSet SelectWhere (string tableName, string[] items, string[] col, string[] operation, string[] values)
    {
        if (col.Length != operation.Length || operation.Length != values.Length) 
        {
            throw new Exception ("col.Length != operation.Length != values.Length");
        }
        string query = "SELECT " + items[0];
        for (int i = 1; i < items.Length; ++i) 
        {
            query += ", " + items[i];
        }
        query += " FROM " + tableName + " WHERE " + col[0] + operation[0] + "‘" + values[0] + "‘ ";
        for (int i = 1; i < col.Length; ++i) 
        {
            query += " AND " + col[i] + operation[i] + "‘" + values[0] + "‘ ";
        }

        return ExecuteQuery (query);
    } 
    
    //更新数据
    public DataSet UpdateInto (string tableName, string []cols,string []colsvalues,string selectkey,string selectvalue)
    {
        string query = "UPDATE "+tableName+" SET "+cols[0]+" = "+colsvalues[0];
        for (int i = 1; i < colsvalues.Length; ++i) 
        {
              query += ", " +cols[i]+" ="+ colsvalues[i];
        }
         query += " WHERE "+selectkey+" = "+selectvalue+" ";
        return ExecuteQuery (query);
    }
    
    //删除数据
    public DataSet Delete(string tableName,string []cols,string []colsvalues)
    {
        string query = "DELETE FROM "+tableName + " WHERE " +cols[0] +" = " + colsvalues[0];
        for (int i = 1; i < colsvalues.Length; ++i) 
        {
                 query += " or " +cols[i]+" = "+ colsvalues[i];
        }
        Debug.Log(query);
        return ExecuteQuery (query);
    }
    
    public  void Close()
    {
        if(dbConnection != null)
        {
            dbConnection.Close();
            dbConnection.Dispose();
            dbConnection = null;
        }
    }
    
　　//执行sql语句
    public static DataSet ExecuteQuery(string sqlString)  
    {  
        if(dbConnection.State==ConnectionState.Open)
        {
             DataSet ds = new DataSet();  //表的集合
              try  
            {  
                MySqlDataAdapter da = new MySqlDataAdapter(sqlString, dbConnection); 
                da.Fill(ds);
            }  
            catch (Exception ee)  
            {
                throw new Exception("SQL:" + sqlString + "/n" + ee.Message.ToString());  
            }
            finally
            {
            }
            return ds;
        }
        return null;
    }
}

using UnityEngine;  
using System;  
using System.Data;  
using System.Collections;   
using MySql.Data.MySqlClient;
using MySql.Data;
using System.IO;

public class NewBehaviourScript : MonoBehaviour
{
        string Error = null;

        void Start ()
        {
                try {
                        SqlAccess sql = new  SqlAccess ();        //创建SqlAccess 对象
                        sql.CreateTableAutoID("stu",new string[]{"id","name","qq"}, new string[]{"int","text","text"}); //主键自增长       
                        //sql.CreateTable("stu",new string[]{"name","qq"}, new string[]{"text","text"});  //建普通表
                        sql.InsertInto("stu",new string[]{"name","qq"},new string[]{"aa","12345678"});//插入数据
                        sql.InsertInto("stu",new string[]{"name","qq"},new string[]{"bb","98765432"});
                        DataSet ds = sql.SelectAll ("stu");
                        if (ds != null) {
                                DataTable table = ds.Tables [0];
                                foreach (DataRow row in table.Rows) 
　　　　　　　　　　　　　　　　　　 {
                                        foreach (DataColumn column in table.Columns)
                                        {
                                                Debug.Log (row [column]);
                                        }
                                }
                        }  
                        sql.Close ();
                } catch (Exception e) {
                        Error = e.Message;
                }
        }
    
        // Update is called once per frame
        void OnGUI ()
        {
                if (Error != null) {
                        GUILayout.Label (Error);
                }
        }
}