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Windows7,Unity3D,SQLite Expert Personal 3
开发语言:
JavaScript
需要的dll文件:
Mono.Data.Sqlite.dll和sqlite3.dll,dll文件位置,截图:
Unity3D教程:Unity3D与Sqlite数据库直连
一定要在这个目录下,请保持一致。
如果需要将编译好的程序发布成功的话,需要改一些地方,具体见下面的截图:
要改动的地方已用红色标记,注意这个要改成.NET2.0,这样才能够发布的。系统默认的不是.NET2.0,这一点要注意!!!
下面来看下代码吧,先看下如何创建数据库的代码,这一篇代码是不用挂到任何对象上面去的,你只用把它当成一个工具即可。如下所示:
- /* Javascript class for accessing SQLite objects.
- To use it, you need to make sure you COPY Mono.Data.SQLiteClient.dll from wherever it lives in your Unity directory
- to your project's Assets folder
- Originally created by dklompmaker in 2009
- http://forum.unity3d.com/threads ... sier-Database-Stuff
- Modified 2011 by Alan Chatham */
- //#pragma strict
- /*
代码描述
*本代码是为了在Windows环境下运行unity3d和Sqlite数据库而写的;实现的基本功能是unity3d能够与数据库之间进行基本的通信,比如说:在数据库中的数据被改变了以后,unity3d中得到的数据也会在刷新了之后跟着改变;这只是一个基本的核心的技术,为的是能够应用在大型的unity3d项目中,能够存储场景中的项目的属性,在需要改变对象的属性或增加、减少等对象时能够很方便的用得上。要实现本代码。首先需要一些dll文件,一个是Mono.Data.SQLiteClient.dll,另外一个是sqlite3.dll,这些文件都能够在unity3d的安装目录中找得到。除此之外,还需要把这两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,然后将这两个dll文件放在该文件夹写。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。
细解释代码:
- *
- */
- import System.Data; // we import our data class 我们先导入我们的数据集
- import Mono.Data.Sqlite; // we import sqlite 我们导入sqlite数据集,也就是Plugins文件夹下的那个dll文件
- class dbAccess {
- // variables for basic query access
- private var connection : String; //数据库的连接字符串,用于建立与特定数据源的连接
- private var dbcon : IDbConnection; //IDbConnection的连接对象,其实就是一个类对象
- private var dbcmd : IDbCommand; //IDbCommand类对象,用来实现操作数据库的命令:注解:我在网上资料看到的如何实现对数据库执行命令:
- //首先创建一个IDbConnection连接对象,然后将一条数据库命令赋值给一个字符串,利用这个字符串和连接对象
- //就可以创建(new)一个IDbCommand对象了,然后使用提供的方法就可以执行这个命令了。
- private var reader : IDataReader; //reader的作用就是读取结果集的一个或多个只进结果流
- function OpenDB(p : String){
- connection = "URI=file:" + p; // we set the connection to our database
- dbcon = new SqliteConnection(connection);
- dbcon.Open(); //打开数据库连接操作
- }
- function BasicQuery(q : String, r : boolean){ // run a baic Sqlite query
- dbcmd = dbcon.CreateCommand(); // create empty command
- dbcmd.CommandText = q; // fill the command
- reader = dbcmd.ExecuteReader(); // execute command which returns a reader 返回IDataReader的对象,创建IDataReader的对象
- if(r){ // if we want to return the reader
- return reader; // return the reader 返回读取的对象,就是读到了什么东西
- }
- }
- // This returns a 2 dimensional ArrayList with all the
- // data from the table requested
- function ReadFullTable(tableName : String){
- var query : String;
- query = "SELECT * FROM " + tableName;
- dbcmd = dbcon.CreateCommand();
- dbcmd.CommandText = query;
- reader = dbcmd.ExecuteReader();
- var readArray = new ArrayList();
- while(reader.Read()){
- var lineArray = new ArrayList();
- for (var i = 0; i < reader.FieldCount; i++)
- lineArray.Add(reader.GetValue(i)); // This reads the entries in a row
- readArray.Add(lineArray); // This makes an array of all the rows
- }
- return readArray; // return matches
- }
- // This function deletes all the data in the given table. Forever. WATCH OUT! Use sparingly, if at all
- function DeleteTableContents(tableName : String){
- var query : String;
- query = "DELETE FROM " + tableName;
- dbcmd = dbcon.CreateCommand();
- dbcmd.CommandText = query;
- reader = dbcmd.ExecuteReader();
- }
- function CreateTable(name : String, col : Array, colType : Array){ // Create a table, name, column array, column type array
- var query : String;
- query = "CREATE TABLE " + name + "(" + col[0] + " " + colType[0];
- for(var i=1; i
- query += ", " + col + " " + colType;
- }
- query += ")";
- dbcmd = dbcon.CreateCommand(); // create empty command
- dbcmd.CommandText = query; // fill the command
- reader = dbcmd.ExecuteReader(); // execute command which returns a reader
- }
- function InsertIntoSingle(tableName : String, colName : String, value : String){ // single insert
- var query : String;
- query = "INSERT INTO " + tableName + "(" + colName + ") " + "VALUES (" + value + ")";
- dbcmd = dbcon.CreateCommand(); // create empty command
- dbcmd.CommandText = query; // fill the command
- reader = dbcmd.ExecuteReader(); // execute command which returns a reader
- }
- function InsertIntoSpecific(tableName : String, col : Array, values : Array){ // Specific insert with col and values
- var query : String;
- query = "INSERT INTO " + tableName + "(" + col[0];
- for(var i=1; i
- query += ", " + col;
- }
- query += ") VALUES (" + values[0];
- for(i=1; i
- query += ", " + values;
- }
- query += ")";
- dbcmd = dbcon.CreateCommand();
- dbcmd.CommandText = query;
- reader = dbcmd.ExecuteReader();
- }
- function InsertInto(tableName : String, values : Array){ // basic Insert with just values
- var query : String;
- query = "INSERT INTO " + tableName + " VALUES (" + values[0];
- for(var i=1; i
- query += ", " + values;
- }
- query += ")";
- dbcmd = dbcon.CreateCommand();
- dbcmd.CommandText = query;
- reader = dbcmd.ExecuteReader();
- }
- // This function reads a single column
- // wCol is the WHERE column, wPar is the operator you want to use to compare with,
- // and wValue is the value you want to compare against.
- // Ex. - SingleSelectWhere("puppies", "breed", "earType", "=", "floppy")
- // returns an array of matches from the command: SELECT breed FROM puppies WHERE earType = floppy;
- function SingleSelectWhere(tableName : String, itemToSelect : String, wCol : String, wPar : String, wValue : String){ // Selects a single Item
- var query : String;
- query = "SELECT " + itemToSelect + " FROM " + tableName + " WHERE " + wCol + wPar + wValue;
- dbcmd = dbcon.CreateCommand();
- dbcmd.CommandText = query;
- reader = dbcmd.ExecuteReader();
- var readArray = new Array();
- while(reader.Read()){
- readArray.Push(reader.GetString(0)); // Fill array with all matches
- }
- return readArray; // return matches
- }
- function CloseDB(){
- reader.Close(); // clean everything up
- reader = null;
- dbcmd.Dispose();
- dbcmd = null;
- dbcon.Close();
- dbcon = null;
- }
- }
7、如何在Unity3D中使用这个数据库的代码:
- //#pragma strict
- /* Script for testing out SQLite in Javascript
- 2011 - Alan Chatham
- Released into the public domain
- This script is a GUI script - attach it to your main camera.
- It creates/opens a SQLite database, and with the GUI you can read and write to it.
- */
- // This is the file path of the database file we want to use
- // Right now, it'll load TestDB.sqdb in the project's root folder.
- // If one doesn't exist, it will be automatically created.
- public var DatabaseName : String = "TestDB.sqdb";
- // This is the name of the table we want to use
- public var TableName : String = "TestTable";
- var db : dbAccess;
- function Start(){
- // Give ourselves a dbAccess object to work with, and open it
- db = new dbAccess();
- db.OpenDB(DatabaseName);
- // Let's make sure we've got a table to work with as well!
- var tableName = TableName;
- var columnNames = new Array("firstName","lastName");
- var columnValues = new Array("text","text");
- try {db.CreateTable(tableName,columnNames,columnValues);
- }
- catch(e){// Do nothing - our table was already created判断表是否被创建了
- //- we don't care about the error, we just don't want to see it
- }
- }
- // These variables just hold info to display in our GUI
- var firstName : String = "First Name";
- var lastName : String = "Last Name";
- var DatabaseEntryStringWidth = 100;
- var scrollPosition : Vector2;
- var databaseData : ArrayList = new ArrayList();
- // This GUI provides us with a way to enter data into our database
- // as well as a way to view it
- function OnGUI(){
- GUI.Box(Rect (25,25,Screen.width - 50, Screen.height - 50),"Data");
- GUILayout.BeginArea(Rect(50, 50, Screen.width - 100, Screen.height - 100));
- // This first block allows us to enter new entries into our table
- GUILayout.BeginHorizontal();
- firstName = GUILayout.TextField(firstName, GUILayout.Width (DatabaseEntryStringWidth));
- lastName = GUILayout.TextField(lastName, GUILayout.Width (DatabaseEntryStringWidth));
- //lastName = GUILayout.TextField();
- GUILayout.EndHorizontal();
- if (GUILayout.Button("Add to database")){
- // Insert the data
- InsertRow(firstName,lastName);
- // And update the readout of the database
- databaseData = ReadFullTable();
- }
- // This second block gives us a button that will display/refresh the contents of our database
- GUILayout.BeginHorizontal();
- if (GUILayout.Button ("Read Database"))
- databaseData = ReadFullTable();
- if (GUILayout.Button("Clear"))
- databaseData.Clear();
- GUILayout.EndHorizontal();
- GUILayout.Label("Database Contents");
- scrollPosition = GUILayout.BeginScrollView(scrollPosition, GUILayout.Height(100));
- for (var line : ArrayList in databaseData){
- GUILayout.BeginHorizontal();
- for (var s in line){
- GUILayout.Label(s.ToString(), GUILayout.Width(DatabaseEntryStringWidth));
- }
- GUILayout.EndHorizontal();
- }
- GUILayout.EndScrollView();
- if (GUILayout.Button("Delete All Data")){
- DeleteTableContents();
- databaseData = ReadFullTable();
- }
- GUILayout.EndArea();
- }
- // Wrapper function for inserting our specific entries into our specific database and table for this file
- function InsertRow(firstName, lastName){
- var values = new Array(("'"+firstName+"'"),("'"+lastName+"'"));
- db.InsertInto(TableName, values);
- }
- // Wrapper function, so we only mess with our table.
- function ReadFullTable(){
- return db.ReadFullTable(TableName);
- }
- // Another wrapper function...
- function DeleteTableContents(){
- db.DeleteTableContents(TableName);
- }
运行结果:
这是在Unity3D中运行的结果,数据的操作结果如下:
我们看见了数据的操作能够成功,经过测试,其他的Button也都能出现相对应的效果,那我们再看看这个到底有没有生成我们想要的数据库文件:
文件当中数据:经测试,我们在对数据库中的数据进行操作的时候,我们的Unity3D中的数据也会发生相应的改变了!
网站名称:Unity3D教程:与Sqlite数据库直连
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