Unity3D连接本地或局域网MySQL数据库

准备工作：

1、打开 Unity3D 安装目录，到这个路径下 Editor > Data > Mono > lib > mono > 2.0 拷贝出下图的五个动态链接库，放到 Unity3D 工程目录下 Assets/Plugins 文件夹中。这里我想重点说一下，在使用过程中这五个动态链接库需要与 Unity3D 版本匹配，也就是说你不要在 Uniyt3D 5.3 版本拷贝出来，拿去 Uniyt3D 5.4 版本中使用，这是有可能出问题的，最好是在自己的 Unity3D 安装目录下去拷贝。I18N.CJK.dll 这个链接库，如果是 PC 端连接数据库可以不需要，如果是移动端连接数据库就必须要。

2、网上下载一个 MySql.Data.dll 动态链接库，也放到 Unity3D 工程目录下 Assets/Plugins 文件夹中。

为了方便对数据库进行创建、增加、删除、修改、查询等操作，我封装了一个工具类，代码如下：

 using MySql.Data.MySqlClient;
 using System;
 using System.Data;

 public class MySqlAccess
 {
     public static MySqlConnection mySqlConnection;//连接类对象

     private static string host;     //IP地址。如果只是在本地的话，写localhost就可以。
     private static string id;       //用户名。
     private static string pwd;      //密码。
     private static string dataBase; //数据库名称。

     /// <summary>
     /// 构造方法
     /// </summary>
     /// <param name="_host">IP地址</param>
     /// <param name="_id">用户名</param>
     /// <param name="_pwd">密码</param>
     /// <param name="_dataBase">数据库名称</param>
     public MySqlAccess(string _host, string _id, string _pwd, string _dataBase)
     {
         host = _host;
         id = _id;
         pwd = _pwd;
         dataBase = _dataBase;
         OpenSql();
     }

     /// <summary>
     /// 打开数据库
     /// </summary>
     public static void OpenSql()
     {
         try
         {
             //string.Format是将指定的 String类型的数据中的每个格式项替换为相应对象的值的文本等效项。
             string mySqlString = string.Format("Database={0};Data Source={1};User Id={2};Password={3};", dataBase, host, id, pwd, "");
             mySqlConnection = new MySqlConnection(mySqlString);
             mySqlConnection.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());
         }
     }

     /// <summary>
     /// 创建表
     /// </summary>
     /// <param name="name">表名</param>
     /// <param name="colName">属性列</param>
     /// <param name="colType">属性类型</param>
     /// <returns></returns>
     public DataSet CreateTable(string name, string[] colName, string[] colType)
     {
         if (colName.Length != colType.Length)
         {
             throw new Exception("输入不正确：" + "columns.Length != colType.Length");
         }
         string query = "CREATE TABLE  " + name + "(" + colName[] + " " + colType[];
         for (int i = ; i < colName.Length; i++)
         {
             query += "," + colName[i] + " " + colType[i];
         }
         query += ")";
         return QuerySet(query);
     }

     /// <summary>
     /// 创建具有id自增的表
     /// </summary>
     /// <param name="name">表名</param>
     /// <param name="col">属性列</param>
     /// <param name="colType">属性列类型</param>
     /// <returns></returns>
     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[] + " " + colType[] + " NOT NULL AUTO_INCREMENT";
         for (int i = ; i < col.Length; ++i)
         {
             query += ", " + col[i] + " " + colType[i];
         }
         query += ", PRIMARY KEY (" + col[] + ")" + ")";
         return QuerySet(query);
     }

     /// <summary>
     /// 插入一条数据，包括所有，不适用自动累加ID。
     /// </summary>
     /// <param name="tableName">表名</param>
     /// <param name="values">插入值</param>
     /// <returns></returns>
     public DataSet InsertInto(string tableName, string[] values)
     {
         string query = "INSERT INTO " + tableName + " VALUES (" + "'" + values[] + "'";
         for (int i = ; i < values.Length; ++i)
         {
             query += ", " + "'" + values[i] + "'";
         }
         query += ")";
         return QuerySet(query);
     }

     /// <summary>
     /// 插入部分ID
     /// </summary>
     /// <param name="tableName">表名</param>
     /// <param name="col">属性列</param>
     /// <param name="values">属性值</param>
     /// <returns></returns>
     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[];
         for (int i = ; i < col.Length; ++i)
         {
             query += ", " + col[i];
         }
         query += ") VALUES (" + "'" + values[] + "'";
         for (int i = ; i < values.Length; ++i)
         {
             query += ", " + "'" + values[i] + "'";
         }
         query += ")";
         return QuerySet(query);
     }

     /// <summary>
     /// 查询表数据
     /// </summary>
     /// <param name="tableName">表名</param>
     /// <param name="items">需要查询的列</param>
     /// <param name="whereColName">查询的条件列</param>
     /// <param name="operation">条件操作符</param>
     /// <param name="value">条件的值</param>
     /// <returns></returns>
     public DataSet Select(string tableName, string[] items, string[] whereColName, string[] operation, string[] value)
     {
         if (whereColName.Length != operation.Length || operation.Length != value.Length)
         {
             throw new Exception("输入不正确：" + "col.Length != operation.Length != values.Length");
         }
         string query = "SELECT " + items[];
         for (int i = ; i < items.Length; i++)
         {
             query += "," + items[i];
         }
         query += "  FROM  " + tableName + "  WHERE " + " " + whereColName[] + operation[] + " '" + value[] + "'";
         for (int i = ; i < whereColName.Length; i++)
         {
             query += " AND " + whereColName[i] + operation[i] + "' " + value[i] + "'";
         }
         return QuerySet(query);
     }

     /// <summary>
     /// 更新表数据
     /// </summary>
     /// <param name="tableName">表名</param>
     /// <param name="cols">更新列</param>
     /// <param name="colsvalues">更新的值</param>
     /// <param name="selectkey">条件：列</param>
     /// <param name="selectvalue">条件：值</param>
     /// <returns></returns>
     public DataSet UpdateInto(string tableName, string[] cols, string[] colsvalues, string selectkey, string selectvalue)
     {
         string query = "UPDATE " + tableName + " SET " + cols[] + " = " + colsvalues[];
         for (int i = ; i < colsvalues.Length; ++i)
         {
             query += ", " + cols[i] + " =" + colsvalues[i];
         }
         query += " WHERE " + selectkey + " = " + selectvalue + " ";
         return QuerySet(query);
     }

     /// <summary>
     /// 删除表数据
     /// </summary>
     /// <param name="tableName">表名</param>
     /// <param name="cols">条件：删除列</param>
     /// <param name="colsvalues">删除该列属性值所在得行</param>
     /// <returns></returns>
     public DataSet Delete(string tableName, string[] cols, string[] colsvalues)
     {
         string query = "DELETE FROM " + tableName + " WHERE " + cols[] + " = " + colsvalues[];
         for (int i = ; i < colsvalues.Length; ++i)
         {
             query += " or " + cols[i] + " = " + colsvalues[i];
         }
         return QuerySet(query);
     }

     /// <summary>
     /// 释放
     /// </summary>
     public void Close()
     {
         if (mySqlConnection != null)
         {
             mySqlConnection.Close();
             mySqlConnection.Dispose();
             mySqlConnection = null;
         }
     }

     /// <summary>
     /// 执行Sql语句
     /// </summary>
     /// <param name="sqlString">sql语句</param>
     /// <returns></returns>
     public static DataSet QuerySet(string sqlString)
     {
         if (mySqlConnection.State == ConnectionState.Open)
         {
             DataSet ds = new DataSet();
             try
             {
                 MySqlDataAdapter mySqlDataAdapter = new MySqlDataAdapter(sqlString, mySqlConnection);
                 mySqlDataAdapter.Fill(ds);
             }
             catch (Exception e)
             {
                 throw new Exception("SQL:" + sqlString + "/n" + e.Message.ToString());
             }
             finally
             {
             }
             return ds;
         }
         return null;
     }
 }

接下来我们就可以访问数据库了，代码如下：

 using UnityEngine;
 using System.Data;

 public class Test : MonoBehaviour
 {
     private void Start()
     {
         MySqlAccess mySql = new MySqlAccess("localhost", "root", "root", "Test");
         mySql.CreateTableAutoID("tableTest", new string[] { "id", "name", "age" }, new string[] { "int", "text", "text" });
         mySql.InsertInto("tableTest", new string[] { "name", "age" }, new string[] { "张三", "" });
         mySql.InsertInto("tableTest", new string[] { "name", "age" }, new string[] { "李四", "" });
         for (int i = ; i < ; i++)
         {
             DataSet ds = mySql.Select("tableTest", new string[] { "name", "age" }, new string[] { "id" }, new string[] { "=" }, new string[] { i.ToString() });
             if (ds != null)
             {
                 DataTable table = ds.Tables[];
                 foreach (DataRow row in table.Rows)
                 {
                     foreach (DataColumn column in table.Columns)
                     {
                         Debug.Log(row[column]);
                     }
                 }
             }
         }
         mySql.Close();
     }
 }