用unity开发的安卓端游戏,如果需要使用Sqlite数据库,有很多地方就需要注意。
首先我们需要一些dll库:Mono.Data.Sqlite.dll、sqlite3.dll、System.Data.dll,这三个dll库我们需要放到Assets\Plugins文件夹下,如果文件夹不存在就需要按照这个路径建立。此外,Assets\Plugins\Android这个路径下还需要libsqlite3.dll。
当dll库都导入完成后,我们就需要导入数据库文件了。数据库文件的建立这里就不多提了。在Assets下建立StreamingAssets,将数据库文件放入该文件夹下。
准备工作完成后就是代码了:
using UnityEngine;
using System.Collections;
using Mono.Data.Sqlite;
using System.IO;
public class DBAccess {
private static DBAccess instance;
private SqliteConnection dbConnection;
private SqliteCommand dbCommand;
private SqliteDataReader dbReader;
public static DBAccess Instance
{
get {
if (instance == null)
{
string dbName = Application.persistentDataPath + “/” + “Score.db”;
CopyDB(dbName);
instance = new DBAccess(“URI=file:” + dbName);
}
return instance;
}
}
private static void CopyDB(string dbName)
{
if (!File.Exists(dbName))
{
WWW loadDB = new WWW(“jar:file://” + Application.dataPath + “!/assets/” + “Score.db”);
bool boo = true;
while (boo)
{
if (loadDB.isDone)
{
File.WriteAllBytes(dbName, loadDB.bytes);
boo = false;
}
}
}
}
private DBAccess(string dbName)
{
OpenDB(dbName);
}
private void OpenDB(string dbName)
{
try
{
dbConnection = new SqliteConnection(dbName);
dbConnection.Open();
if (dbConnection.State == System.Data.ConnectionState.Open)
{
Debug.Log(“open”);
}
}
catch (UnityException e)
{
string eString = e.ToString();
Debug.Log(eString);
}
}
}
上述为打开数据库的代码。另外,在打包时注意setting中的Api Compatibility Level 要设置为.NET2.0