Unity3D研究之使用C#语言建立本地数据库

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以前在开发中一直使用IOS源生的数据库,通过传递消息的形式在与Unity3D中进行交互。本文我在详细说说如何使用C#语言来在MAC 操作系统下创建Unity本地数据库

原始文章主要是使用JavaScript语言建立本地数据库

以前在开发中一直使用IOS源生的数据库,通过传递消息的形式在与Unity3D中进行交互。本文我在详细说说如何使用C#语言来在MAC 操作系统下创建Unity本地数据库,我是C#控.

首先你需要得到Mono.Data.Sqlite.dll 文件 与System.Data.dll文件。如果你在Mac 操作系统下使用Unity那么很悲剧,找不到这两个文件,至少我没能找到。后来我在Windows下的Unity安装路径中找到了它。为了方便大家我将这两个文件上传至网盘中,如果没有这两个文件的朋友请下载。Unity数据库文件.zip

.zip文件下载完毕后直接解压,然后将Mono.Data.Sqlite.dll 文件 与System.Data.dll文件放在Unity工程中的Assets文件夹中。如下图所示,两个文件已经放置在Project视图当中。

Ok ,我们编写C#脚本,原始文章没有Unity数据库更新与删除的方法,我在这里加上更新与删除的方法,方便大家开发时使用。因为其实Unity中更新与删除数据库也是个比较重要的功能。

注意:下面脚本不要绑定在任何游戏对象身上,大家无需把它当作脚本可以当作一个工具类来使用。

[代码]java代码:

001 using UnityEngine;
002  
003 using System;
004 using System.Collections;
005 using Mono.Data.Sqlite;
006  
007 public class DbAccess
008  
009 {
010  
011     private SqliteConnection dbConnection;
012  
013     private SqliteCommand dbCommand;
014  
015     private SqliteDataReader reader;
016  
017     public DbAccess (string connectionString)
018  
019     {
020  
021         OpenDB (connectionString);
022  
023     }
024     public DbAccess ()
025     {
026  
027     }
028  
029     public void OpenDB (string connectionString)
030  
031     {
032         try
033          {
034             dbConnection = new SqliteConnection (connectionString);
035  
036             dbConnection.Open ();
037  
038             Debug.Log ("Connected to db");
039          }
040         catch(Exception e)
041         {
042             string temp1 = e.ToString();
043             Debug.Log(temp1);
044         }
045  
046     }
047  
048     public void CloseSqlConnection ()
049  
050     {
051  
052         if (dbCommand != null) {
053  
054             dbCommand.Dispose ();
055  
056         }
057  
058         dbCommand = null;
059  
060         if (reader != null) {
061  
062             reader.Dispose ();
063  
064         }
065  
066         reader = null;
067  
068         if (dbConnection != null) {
069  
070             dbConnection.Close ();
071  
072         }
073  
074         dbConnection = null;
075  
076         Debug.Log ("Disconnected from db.");
077  
078     }
079  
080     public SqliteDataReader ExecuteQuery (string sqlQuery)
081  
082     {
083  
084         dbCommand = dbConnection.CreateCommand ();
085  
086         dbCommand.CommandText = sqlQuery;
087  
088         reader = dbCommand.ExecuteReader ();
089  
090         return reader;
091  
092     }
093  
094     public SqliteDataReader ReadFullTable (string tableName)
095  
096     {
097  
098         string query = "SELECT * FROM " + tableName;
099  
100         return ExecuteQuery (query);
101  
102     }
103  
104     public SqliteDataReader InsertInto (string tableName, string[] values)
105  
106     {
107  
108         string query = "INSERT INTO " + tableName + " VALUES (" + values[0];
109  
110         for (int i = 1; i < values.Length; ++i) {
111  
112             query += ", " + values[i];
113  
114         }
115  
116         query += ")";
117  
118         return ExecuteQuery (query);
119  
120     }
121  
122     public SqliteDataReader UpdateInto (string tableName, string []cols,string []colsvalues,string selectkey,string selectvalue)
123     {
124  
125         string query = "UPDATE "+tableName+" SET "+cols[0]+" = "+colsvalues[0];
126  
127         for (int i = 1; i < colsvalues.Length; ++i) {
128  
129              query += ", " +cols[i]+" ="+ colsvalues[i];
130         }
131  
132          query += " WHERE "+selectkey+" = "+selectvalue+" ";
133  
134         return ExecuteQuery (query);
135     }
136  
137     public SqliteDataReader Delete(string tableName,string []cols,string []colsvalues)
138     {
139             string query = "DELETE FROM "+tableName + " WHERE " +cols[0] +" = " + colsvalues[0];
140  
141             for (int i = 1; i < colsvalues.Length; ++i) {
142  
143                 query += " or " +cols[i]+" = "+ colsvalues[i];
144             }
145         Debug.Log(query);
146         return ExecuteQuery (query);
147     }
148  
149     public SqliteDataReader InsertIntoSpecific (string tableName, string[] cols, string[] values)
150  
151     {
152  
153         if (cols.Length != values.Length) {
154  
155             throw new SqliteException ("columns.Length != values.Length");
156  
157         }
158  
159         string query = "INSERT INTO " + tableName + "(" + cols[0];
160  
161         for (int i = 1; i < cols.Length; ++i) {
162  
163             query += ", " + cols[i];
164  
165         }
166  
167         query += ") VALUES (" + values[0];
168  
169         for (int i = 1; i < values.Length; ++i) {
170  
171             query += ", " + values[i];
172  
173         }
174  
175         query += ")";
176  
177         return ExecuteQuery (query);
178  
179     }
180  
181     public SqliteDataReader DeleteContents (string tableName)
182  
183     {
184  
185         string query = "DELETE FROM " + tableName;
186  
187         return ExecuteQuery (query);
188  
189     }
190  
191     public SqliteDataReader CreateTable (string name, string[] col, string[] colType)
192  
193     {
194  
195         if (col.Length != colType.Length) {
196  
197             throw new SqliteException ("columns.Length != colType.Length");
198  
199         }
200  
201         string query = "CREATE TABLE " + name + " (" + col[0] + " " + colType[0];
202  
203         for (int i = 1; i < col.Length; ++i) {
204  
205             query += ", " + col[i] + " " + colType[i];
206  
207         }
208  
209         query += ")";
210  
211         return ExecuteQuery (query);
212  
213     }
214  
215     public SqliteDataReader SelectWhere (string tableName, string[] items, string[] col, string[] operation, string[] values)
216  
217     {
218  
219         if (col.Length != operation.Length || operation.Length != values.Length) {
220  
221             throw new SqliteException ("col.Length != operation.Length != values.Length");
222  
223         }
224  
225         string query = "SELECT " + items[0];
226  
227         for (int i = 1; i < items.Length; ++i) {
228  
229             query += ", " + items[i];
230  
231         }
232  
233         query += " FROM " + tableName + " WHERE " + col[0] + operation[0] + "'" + values[0] + "' ";
234  
235         for (int i = 1; i < col.Length; ++i) {
236  
237             query += " AND " + col[i] + operation[i] + "'" + values[0] + "' ";
238  
239         }
240  
241         return ExecuteQuery (query);
242  
243     }
244  
245 }

首先是创建本地数据库,我们创建C#脚本Test.cs直接绑定在摄像机中。

[代码]java代码:

01 using UnityEngine;
02 using System.Collections;
03  
04 public class Test : MonoBehaviour
05 {
06  
07     void Start ()
08     {
09  
10         //创建数据库名称为xuanyusong.db
11         DbAccess db = new DbAccess("data source=xuanyusong.db");
12  
13         //创建数据库表,与字段
14         db.CreateTable("momo",new string[]{"name","qq","email","blog"}, new string[]{"text","text","text","text"});
15         //关闭对象
16         db.CloseSqlConnection();
17     }
18  
19 }

运行游戏后,数据库对象会自动生成在项目的根目录中。查看数据库的软件我使用的是Navicat Premium,如果没有请大家下载,然后继续。如下图所示,数据库文件xuanyusong.db已经生成在项目的根目录中,接着我使用Navicat Premium软件将这个数据库打开。数据库的表名为momo 打开表后字段包含name、  qq  、email、  blog。都是我们在代码中创建的。

OK,我们继续。首先是插入数据,记得将编码修改成UTF-16 不然中文会乱码。

[代码]java代码:

01 using UnityEngine;
02 using System.Collections;
03  
04 public class Test : MonoBehaviour
05 {
06  
07     void Start ()
08     {
09  
10         //创建数据库名称为xuanyusong.db
11         DbAccess db = new DbAccess("data source=xuanyusong.db");
12         //请注意 插入字符串是 已经要加上'宣雨松' 不然会报错
13         db.InsertInto("momo", new string[]{ "'宣雨松'","'289187120'","'xuanyusong@gmail.com'","'www.xuanyusong.com'"   });
14         db.CloseSqlConnection();
15     }
16  
17 }

 接着是更新数据。UpdateInto是我新写的方法,接受更新多条数据。

 

 

[代码]java代码:

01 using UnityEngine;
02 using System.Collections;
03  
04 public class Test : MonoBehaviour
05 {
06  
07     void Start ()
08     {
09  
10         //创建数据库名称为xuanyusong.db
11         DbAccess db = new DbAccess("data source=xuanyusong.db");
12  
13         db.UpdateInto("momo",new string[]{"name","qq"},new string[]{"'xuanyusong'","'11111111'"}, "email", "'xuanyusong@gmail.com'"  );
14  
15         db.CloseSqlConnection();
16     }
17  
18 }

然后是删除数据DELETE也是我封装的方法。

[代码]java代码:

01 using UnityEngine;
02 using System.Collections;
03  
04 public class Test : MonoBehaviour
05 {
06  
07     void Start ()
08     {
09  
10         //创建数据库名称为xuanyusong.db
11         DbAccess db = new DbAccess("data source=xuanyusong.db");
12         //请注意 插入字符串是 已经要加上'宣雨松' 不然会报错
13         db.CreateTable("momo",new string[]{"name","qq","email","blog"}, new string[]{"text","text","text","text"});
14         //我在数据库中连续插入三条数据
15         db.InsertInto("momo", new string[]{ "'宣雨松'","'289187120'","'xuanyusong@gmail.com'","'www.xuanyusong.com'"   });
16         db.InsertInto("momo", new string[]{ "'雨松MOMO'","'289187120'","'000@gmail.com'","'www.xuanyusong.com'"   });
17         db.InsertInto("momo", new string[]{ "'哇咔咔'","'289187120'","'111@gmail.com'","'www.xuanyusong.com'"   });
18  
19         //然后在删掉两条数据
20         db.Delete("momo",new string[]{"email","email"}, new string[]{"'xuanyusong@gmail.com'","'000@gmail.com'"}  );
21  
22         db.CloseSqlConnection();
23     }
24  
25 }

***是查找数据。

[代码]java代码:

01 using UnityEngine;
02 using System.Collections;
03  
04 using Mono.Data.Sqlite;
05 public class Test : MonoBehaviour
06 {
07  
08     void Start ()
09     {
10  
11         //创建数据库名称为xuanyusong.db
12         DbAccess db = new DbAccess("data source=xuanyusong.db");
13         //请注意 插入字符串是 已经要加上'宣雨松' 不然会报错
14         db.CreateTable("momo",new string[]{"name","qq","email","blog"}, new string[]{"text","text","text","text"});
15         //我在数据库中连续插入三条数据
16         db.InsertInto("momo", new string[]{ "'宣雨松'","'289187120'","'xuanyusong@gmail.com'","'www.xuanyusong.com'"   });
17         db.InsertInto("momo", new string[]{ "'雨松MOMO'","'289187120'","'000@gmail.com'","'www.xuanyusong.com'"   });
18         db.InsertInto("momo", new string[]{ "'哇咔咔'","'289187120'","'111@gmail.com'","'www.xuanyusong.com'"   });
19  
20         //然后在删掉两条数据
21         db.Delete("momo",new string[]{"email","email"}, new string[]{"'xuanyusong@gmail.com'","'000@gmail.com'"}  );
22  
23         //注解1
24         SqliteDataReader sqReader = db.SelectWhere("momo",new string[]{"name","email"},new string[]{"qq"},new string[]{"="},new string[]{"289187120"});
25  
26         while (sqReader.Read())
27         {
28             Debug.Log(sqReader.GetString(sqReader.GetOrdinal("name")) + sqReader.GetString(sqReader.GetOrdinal("email")));
29         }
30  
31         db.CloseSqlConnection();
32     }
33  
34 }

注解1:这里的结构非常像安卓的数据库指针,然后while循环把每一条数据都取出来。 sqReader.Gerordinal()方法就是拿到对应列名称的数据。如下图所示,经过一些列的添加与删除的操作***数据库的内容如下。

 如下图所示,我使用Log也将数据库name 与 email的字段打印了出来。***我在强调一点,我们在OnStart方法中db.CreateTable创建数据库表,如果重复创建系统会抛出错误。避免这个情况请保证你的数据库表只会被创建一次。祝大家学习愉快嘎嘎嘎~~~

如下图所示,请先在PlaySettings中修改Api Compatibility Level 改成.NET 2.0,如果不修改会报错

注意:Error building Player: Extracting referenced dlls failed. 

无论你编译任何平台都请修改一下这里, 留言中有朋友在编译PC平台中 因为没有修改这里导致无法编译成功。。

IOS平台SQLite的使用:

然后需要修改Test.cs的脚本,在修改一下数据库保存的路径,我们将数据库放在沙盒当中。这样IOS中才可以读取数据库。

[代码]java代码:

01 using UnityEngine;
02 using System.Collections;
03  
04 using Mono.Data.Sqlite;
05 public class Test : MonoBehaviour
06 {
07  
08     void Start ()
09     {
10         //数据库文件储存地址
11         string appDBPath = Application.persistentDataPath + "/xuanyusong.db";
12  
13         DbAccess db = new DbAccess(@"Data Source=" + appDBPath);
14  
15         //请注意 插入字符串是 已经要加上'宣雨松' 不然会报错
16         db.CreateTable("momo",new string[]{"name","qq","email","blog"}, new string[]{"text","text","text","text"});
17         //我在数据库中连续插入三条数据
18         db.InsertInto("momo", new string[]{ "'宣雨松'","'289187120'","'xuanyusong@gmail.com'","'www.xuanyusong.com'"   });
19         db.InsertInto("momo", new string[]{ "'雨松MOMO'","'289187120'","'000@gmail.com'","'www.xuanyusong.com'"   });
20         db.InsertInto("momo", new string[]{ "'哇咔咔'","'289187120'","'111@gmail.com'","'www.xuanyusong.com'"   });
21  
22         //然后在删掉两条数据
23         db.Delete("momo",new string[]{"email","email"}, new string[]{"'xuanyusong@gmail.com'","'000@gmail.com'"}  );
24  
25         //注解1
26         using (SqliteDataReader sqReader = db.SelectWhere("momo",new string[]{"name","email"},new string[]{"qq"},new string[]{"="},new string[]{"289187120"}))
27         {
28  
29             while (sqReader.Read())
30             {
31                 //目前中文无法显示
32                 Debug.Log(sqReader.GetString(sqReader.GetOrdinal("name")));
33  
34                 Debug.Log(sqReader.GetString(sqReader.GetOrdinal("email")));
35  
36             }
37  
38             sqReader.Close();
39         }
40  
41         db.CloseSqlConnection();
42     }
43  
44 }

         下面开始打包成IOS版本,直接运行如下图所示,已经在XCODE的控制台中将字符串信息打印出来。目前我不知道如何读取中文,但是可以确定的是中文信息已经写入数据库中。不信大家可以打开沙盒看看。

Android平台SQLite的使用:
Android与IOS在使用SQLite数据库时有点区别,Android需要将第三方DLL放在Plugins当中。脚本也需要修改一下,先看看Test.cs的改动。

[代码]java代码:

01 using UnityEngine;
02 using System.Collections;
03  
04 using Mono.Data.Sqlite;
05 public class Test : MonoBehaviour
06 {
07  
08     void Start ()
09     {
10         //数据库文件储存地址
11  
12         string appDBPath = Application.persistentDataPath  + "/xuanyusong.db";
13  
14         //注意!!!!!!!这行代码的改动
15         DbAccess db = new DbAccess("URI=file:" + appDBPath);
16  
17         //请注意 插入字符串是 已经要加上'宣雨松' 不然会报错
18         db.CreateTable("momo",new string[]{"name","qq","email","blog"}, new string[]{"text","text","text","text"});
19         //我在数据库中连续插入三条数据
20         db.InsertInto("momo", new string[]{ "'宣雨松'","'289187120'","'xuanyusong@gmail.com'","'www.xuanyusong.com'"   });
21         db.InsertInto("momo", new string[]{ "'雨松MOMO'","'289187120'","'000@gmail.com'","'www.xuanyusong.com'"   });
22         db.InsertInto("momo", new string[]{ "'哇咔咔'","'289187120'","'111@gmail.com'","'www.xuanyusong.com'"   });
23  
24         //然后在删掉两条数据
25         db.Delete("momo",new string[]{"email","email"}, new string[]{"'xuanyusong@gmail.com'","'000@gmail.com'"}  );
26  
27         //注解1
28         using (SqliteDataReader sqReader = db.SelectWhere("momo",new string[]{"name","email"},new string[]{"qq"},new string[]{"="},new string[]{"289187120"}))
29         {
30  
31             while (sqReader.Read())
32             {
33                 Debug.Log("xuanyusong" + sqReader.GetString(sqReader.GetOrdinal("name")));
34  
35                 Debug.Log("xuanyusong" + sqReader.GetString(sqReader.GetOrdinal("email")));
36  
37             }
38  
39             sqReader.Close();
40         }
41  
42         db.CloseSqlConnection();
43     }
44  
45     void Update()
46     {
47         if (Input.GetKeyDown(KeyCode.Escape) ||Input.GetKeyDown(KeyCode.Home) )
48         {
49  
50             Application.Quit();
51         }
52     }
53  
54 }

如下图所示,Player Settings 请和我保持一致。

值得庆幸的是在Android下读取数据库时正常的显示了中文。如下图所示,运行打包后的程序后在Eclipse的后台已经能看到数据库显示的中文与英文,呵呵。
由于工程中需要一些DLL,所以我将工程的下载地址放出,请大家下载。AndroidSQL.unitypackage.zip
MAC平台下的使用:
请先下载原始版本 SQLite (1).unitypackage.zip
我们只需在原始版本之上进行修改即可。
修改Test.cs文件  ,请注意我在代码中标注的内容。

[代码]java代码:

01 using UnityEngine;
02 using System.Collections;
03  
04 using Mono.Data.Sqlite;
05 public class Test : MonoBehaviour
06 {
07  
08     string name = null;
09     string email = null;
10     string appDBPath = null;
11     void Start ()
12     {
13  
14 //////////--------
15         //请注意!!!!!!!
16         //这里的修改
17  
18         appDBPath = Application.dataPath + "/xuanyusong.db";
19  
20         DbAccess db = new DbAccess(@"Data Source=" + appDBPath);
21  
22 //////////--------
23  
24         //请注意 插入字符串是 已经要加上'宣雨松' 不然会报错
25         db.CreateTable("momo",new string[]{"name","qq","email","blog"}, new string[]{"text","text","text","text"});
26         //我在数据库中连续插入三条数据
27         db.InsertInto("momo", new string[]{ "'宣雨松'","'289187120'","'xuanyusong@gmail.com'","'www.xuanyusong.com'"   });
28         db.InsertInto("momo", new string[]{ "'雨松MOMO'","'289187120'","'000@gmail.com'","'www.xuanyusong.com'"   });
29         db.InsertInto("momo", new string[]{ "'哇咔咔'","'289187120'","'111@gmail.com'","'www.xuanyusong.com'"   });
30  
31         //然后在删掉两条数据
32         db.Delete("momo",new string[]{"email","email"}, new string[]{"'xuanyusong@gmail.com'","'000@gmail.com'"}  );
33  
34         SqliteDataReader sqReader = db.SelectWhere("momo",new string[]{"name","email"},new string[]{"qq"},new string[]{"="},new string[]{"289187120"});
35  
36         while (sqReader.Read())
37         {
38  
39             Debug.Log(sqReader.GetString(sqReader.GetOrdinal("name")) + sqReader.GetString(sqReader.GetOrdinal("email")));
40  
41             //取值
42             name = sqReader.GetString(sqReader.GetOrdinal("name"));
43             email = sqReader.GetString(sqReader.GetOrdinal("email"));
44         }
45  
46         db.CloseSqlConnection();
47     }
48  
49     void OnGUI()
50     {
51  
52         ///为了让大家看的更清楚 我将数据库取出的内容显示在屏幕中
53         if(name != null)
54         {
55             GUILayout.Label("XXXXXXXXXXXXX" + name);
56  
57         }
58  
59         if (email!= null)
60         {
61                 GUILayout.Label("XXXXXXXXXXXXX" + email);
62         }
63  
64         if(appDBPath != null)
65         {
66             GUILayout.Label("数据库的路径" + appDBPath);
67         }
68  
69     }
70  
71 }
生成工程后,运行生成的mac程序,我们可以看到 数据已经取出来了。

 

Windows平台SQLite的使用:
Windows平台下与Mac平台有点区别,废了老半天来找到问题所在。MOMO感谢在博客后面留言的朋友,因为没有你们的留言我也不会去研究MAC  Windows下如何使用 呵呵。
进入正题,还是先修改Test.cs文件

[代码]java代码:

01 using System.Collections;
02  
03 using Mono.Data.Sqlite;
04  
05 //using Mono.Data.SqliteClient;
06  
07 public class Test : MonoBehaviour
08 {
09  
10     string  name = null;
11     string  email = null;
12     string path = null;
13  
14     void Start ()
15     {
16         //数据库文件储存地址
17  
18     //注意这里的修改!!!!!!!!!!!!!!
19         string appDBPath = Application.dataPath  + "/xuanyusong.db";
20  
21     //--------------------------
22  
23         DbAccess db = new DbAccess(@"Data Source=" + appDBPath);
24  
25         path = appDBPath;
26  
27         //请注意 插入字符串是 已经要加上'宣雨松' 不然会报错
28         db.CreateTable("momo",new string[]{"name","qq","email","blog"}, new string[]{"text","text","text","text"});
29         //我在数据库中连续插入三条数据
30         db.InsertInto("momo", new string[]{ "'宣雨松'","'289187120'","'xuanyusong@gmail.com'","'www.xuanyusong.com'"   });
31         db.InsertInto("momo", new string[]{ "'雨松MOMO'","'289187120'","'000@gmail.com'","'www.xuanyusong.com'"   });
32         db.InsertInto("momo", new string[]{ "'哇咔咔'","'289187120'","'111@gmail.com'","'www.xuanyusong.com'"   });
33  
34         //然后在删掉两条数据
35         db.Delete("momo",new string[]{"email","email"}, new string[]{"'xuanyusong@gmail.com'","'000@gmail.com'"}  );
36  
37         //注解1
38         using (SqliteDataReader sqReader = db.SelectWhere("momo",new string[]{"name","email"},new string[]{"qq"},new string[]{"="},new string[]{"289187120"}))
39         {
40  
41             while (sqReader.Read())
42             {
43                 //目前中文无法显示
44                 Debug.Log("xuanyusong" + sqReader.GetString(sqReader.GetOrdinal("name")));
45  
46                 Debug.Log("xuanyusong" + sqReader.GetString(sqReader.GetOrdinal("email")));
47  
48                 name = sqReader.GetString(sqReader.GetOrdinal("name"));
49                 email = sqReader.GetString(sqReader.GetOrdinal("email"));
50  
51             }
52  
53             sqReader.Close();
54         }
55  
56         db.CloseSqlConnection();
57     }
58  
59     void OnGUI()
60     {
61         if(name != null)
62         {
63             GUILayout.Label(name);
64         }
65  
66         if(email != null)
67         {
68             GUILayout.Label(email);
69         }
70  
71         if(path != null)
72         {
73             GUILayout.Label(path);
74         }
75     }
76  
77 }
如下图所示打开Unity然后我们需要下载sqlite3.dll文件,接着将dll都放入Plugins文件夹中。不用担心 稍后我会把真个工程的下载地址贴出来其中包括所有的dll 。
***直接打包成Windows平台工程。双击运行.exe文件,如下图所示数据库的数据以及路径MOMO已经打印在屏幕当中啦。哇咔咔~ 然后xuanyusong.db文件就放在ddd_Date文件夹中,我已经用红圈标注出来了。ddd就是工程的名称,ddd_Date该文件夹是自动生成的。
 
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