unity连接sqlite数据库操作

原文链接:http://www.unitymanual.com/bbs/thread-198-1-1.html

最近几天在讨论游戏本地数据存储方式,考虑到跨平台性。最开始打算用xml,但是考虑到xml文件多而杂,而且后期游戏更新。也不是很方便,于是提出了采用sqlite,可是没想到的是原本信心满满的我却遭到了闭门羹,呵呵....

原来,不是用 以前做c#  winform应用那套dll, unity 3d有自己对应的sqlite.dll分别需要三个文件
1.Mono.Data.Sqlite.dll 
在unity安装文件“Unity\Editor\Data\MonoBleedingEdge\lib\mono”可以找到,注意mono文件夹下面 有对应版本号,可以根据自己的项目来决定选择。

2.System.Data.dll   同上位置一样可以找到 ,不过建议使用2.0版本

3.sqlite3.dll   就在\Unity\Editor下可以找到

除此之外,还需要把这3个文件放在你的项目的这个路径下面:\Assets\Plugins\,没有Plugins文件夹就必须创建这个文件夹,然后将这三个dll文件放在该文件夹下面。当然,如果你想能够在PC上面发布成可执行文件,还需要改动一些地方。在 unity3d 中的Play Setting ->Other Setting 中将Api Compatibility的等级改为.NET 2.0;那么这些操作做完了以后,如果你的代码写得没有 问题 ,那么你就可以成功了。

好啦 ,前面准工作完成 下面就直接看测试代码吧
首先是一个 Sqlite的数据库操作类,该类是我改编的 网上也有很多,不过好像是js编写,于是自己动手改编成了c#希望能对大家有用,呵呵...

好了,上类 SqliteDbHelper

using UnityEngine;
using System.Collections;
using Mono.Data.Sqlite;//导入sqlite数据集,也就是Plugins文件夹下的那个dll文件
using System;//数据集 是formwork2.0 用vs开发要自己引用框架中的System.Data
using System.Data;

public class SqliteDbHelper
{
    /// 
    /// 声明一个连接对象
    /// 
    private SqliteConnection dbConnection;
    /// 
    /// 声明一个操作数据库命令
    /// 
    private SqliteCommand dbCommand;
    /// 
    /// 声明一个读取结果集的一个或多个结果流
    /// 
    private SqliteDataReader reader;
    /// 
    /// 数据库的连接字符串,用于建立与特定数据源的连接
    /// 
    /// 数据库的连接字符串,用于建立与特定数据源的连接
    public SqliteDbHelper (string connectionString)
    {
     	OpenDB(connectionString);
        Debug.Log(connectionString);
    }
    public void OpenDB (string connectionString)
    {
      try
      {
       dbConnection = new SqliteConnection (connectionString);
       dbConnection.Open();
       Debug.Log ("Connected to db");
      }
      catch(Exception e)
      {
       string temp1 = e.ToString();
       Debug.Log(temp1);
      }
    }
    /// 
    /// 关闭连接
    /// 
    public void CloseSqlConnection ()
    {
      if (dbCommand != null)
      {
      	dbCommand.Dispose();
      }
      dbCommand = null;
      if (reader != null)
      {
        reader.Dispose ();
      }
      reader = null;
      if (dbConnection != null)
      {
        dbConnection.Close ();
      }
      dbConnection = null;
      Debug.Log ("Disconnected from db.");
    }
    /// 
    /// 执行查询sqlite语句操作
    /// 
    /// 
    /// 
    public SqliteDataReader ExecuteQuery (string sqlQuery)
    {
     dbCommand = dbConnection.CreateCommand ();
     dbCommand.CommandText = sqlQuery;
     reader = dbCommand.ExecuteReader ();
     return reader;
    }
    /// 
    /// 查询该表所有数据
    /// 
    /// 表名
    /// 
    public SqliteDataReader ReadFullTable (string tableName)
    {
     string query = "SELECT * FROM " + tableName;
     return ExecuteQuery (query);
    }
    /// 
    /// 动态添加表字段到指定表
    /// 
    /// 表名
    /// 字段集合
    /// 
    public SqliteDataReader InsertInto (string tableName, string[] values)
    {
     string query = "INSERT INTO " + tableName + " VALUES (" + values[0];
     for (int i = 1; i < values.Length; ++i)
     {
      query += ", " + values;
     }
     query += ")";
     return ExecuteQuery (query);
    }
    /// 
    /// 动态更新表结构
    /// 
    /// 表名
    /// 字段集
    /// 对于集合值
    /// 要查询的字段
    /// 要查询的字段值
    /// 
    public SqliteDataReader 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+" ="+ colsvalues;
         }
         query += " WHERE "+selectkey+" = "+selectvalue+" ";
         return ExecuteQuery (query);
    }
    /// 
    /// 动态删除指定表字段数据
    /// 
    /// 表名
    /// 字段
    /// 字段值
    /// 
    public SqliteDataReader 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+" = "+ colsvalues;
      }
       Debug.Log(query);
       return ExecuteQuery (query);
    }
    /// 
    /// 动态添加数据到指定表
    /// 
    /// 表名
    /// 字段
    /// 值
    /// 
     public SqliteDataReader InsertIntoSpecific (string tableName, string[] cols, string[] values)
     {
         if (cols.Length != values.Length)
         {
             throw new SqliteException ("columns.Length != values.Length");
         }
         string query = "INSERT INTO " + tableName + "(" + cols[0];
         for (int i = 1; i < cols.Length; ++i)
         {
             query += ", " + cols;
         }
         query += ") VALUES (" + values[0];
         for (int i = 1; i < values.Length; ++i)
         {
             query += ", " + values;
         }
         query += ")";
         return ExecuteQuery (query);
     }
    /// 
    /// 动态删除表
    /// 
    /// 表名
    /// 
     public SqliteDataReader DeleteContents (string tableName)
     {
         string query = "DELETE FROM " + tableName;
         return ExecuteQuery (query);
     }
    /// 
    /// 动态创建表
    /// 
    /// 表名
    /// 字段
    /// 类型
    /// 
     public SqliteDataReader CreateTable (string name, string[] col, string[] colType)
     {
         if (col.Length != colType.Length)
         {
             throw new SqliteException ("columns.Length != colType.Length");
         }
         string query = "CREATE TABLE " + name + " (" + col[0] + " " + colType[0];
         for (int i = 1; i < col.Length; ++i)
         {
             query += ", " + col + " " + colType;
         }
         query += ")";
         Debug.Log(query);
         return ExecuteQuery (query);
     }
    /// 
    /// 根据查询条件 动态查询数据信息
    /// 
    /// 表
    /// 查询数据集合
    /// 字段
    /// 操作
    /// 值
    /// 
     public SqliteDataReader SelectWhere (string tableName, string[] items, string[] col, string[] operation, string[] values)
     {
         if (col.Length != operation.Length || operation.Length != values.Length)
         {
             throw new SqliteException ("col.Length != operation.Length != values.Length");
         }
         string query = "SELECT " + items[0];
         for (int i = 1; i < items.Length; ++i)
         {
            query += ", " + items;
         }
         query += " FROM " + tableName + " WHERE " + col[0] + operation[0] + "'" + values[0] + "' ";
         for (int i = 1; i < col.Length; ++i)
         {
             query += " AND " + col + operation + "'" + values[0] + "' ";
         }
         return ExecuteQuery (query);
     }
}
好了 sqlite数据操作类写好后:本来应该按照编码规范来写  因为我本身以前做c#的所有一般使用三层架构
Modle实例化对象类 ,DAl数据处理类,IDal数据接口类,Bll业务逻辑类
但是呢,目前只为测试 因此我就不一一详细介绍代码内容了,相信会c#的人都会三层架构,呵呵

ok,言归正传,下面将贴出unity3d 使用上面 sqliteDbHelper 操作类
SqliteDbTest:
using UnityEngine;
using System.Collections;
using System;
using Mono.Data.Sqlite;
using System.Data;

public class SqliteDbTest : MonoBehaviour {
  	SqliteDbHelper db ;
	int id=1;
void Start ()
{
        db = new SqliteDbHelper("Data Source=./sqlite.db");
        Debug.Log(db.ToString());
   /*
    SqliteDbAccess db = new SqliteDbAccess("data source=mydb1.db");
  db.CreateTable("momo",new string[]{"name","qq","email","blog"},
   new string[]{"text","text","text","text"});
  db.CloseSqlConnection();
   */
  }    
	public  string name = "";
        public string emls = "";
void OnGUI()
{

  if(GUILayout.Button("create table"))
  {
   db.CreateTable("mytable",new string[]{"id","name","email"},new string[]{"int","varchar(20)","varchar(50)"});
   Debug.Log("create table ok");
  }

  if(GUILayout.Button("insert data"))
  {

   db.InsertInto("mytable",
                new string[] { "" + (++id), "'随风去旅行"+id+"'","'zhangj_live"+id+"@163.com'"});//),"'aaa"+id+"'","'aaa"+id+"@sohu.com'"});

   Debug.Log("insert table ok");
  }


  if(GUILayout.Button("search database"))
        {
            IDataReader sqReader = db.SelectWhere("mytable", new string[]
    {"name","email"},new string[]{"id"},new string[]{"="},new string[]{"2"});
   while (sqReader.Read())
   {
     //Debug.Log(
     name= "name="+sqReader.GetString(sqReader.GetOrdinal("name"));// +
                 emls = "email=" + sqReader.GetString(sqReader.GetOrdinal("email"));
     //);
   }
  }
     if (name != "")
     {
        GUI.Label(new Rect(100, 100, 100, 100), name);
        GUI.Label(new Rect(100, 200, 100, 100), emls);
        //  GUILayout.Label(emls);
     }
  if(GUILayout.Button("close database"))
  {
   db.CloseSqlConnection();
   Debug.Log("close table ok");
  }
}
}
上面的代码很简单 ,相信稍微懂点unity3d的,都能看懂 因此就小偷懒一般 没写注释了,呵呵

由此可以看出 分别实现了
1.动态创建数据库及表结构
2.动态创加入数据
3,.查询指定字段
4.关闭数据连接

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