unity sqlite資料庫操作
阿新 • • 發佈：2019-01-26
首先在專案中新增兩個動態連結庫Mono.Data.Sqlite.dll和System.Data.dll
建立資料庫管理指令碼,該指令碼用來直接操作資料庫的操作，可以看作是對資料庫操作的sql語句的封裝。
using UnityEngine;
using System.Data;
using System;
using System.Collections;
using Mono.Data.Sqlite;
public class DbAccess
{
private SqliteConnection dbConnection;
private SqliteCommand dbCommand;
private 呼叫資料庫方法，將該指令碼掛載到場景中，完成對資料庫管理指令碼封裝方法的呼叫。
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using Mono.Data.Sqlite;
public class SqliteTest1 : MonoBehaviour {
string dbPath;
string dbName;
DbAccess db;
// Use this for initialization
void Start () {
dbName="userInfo.db";
dbPath=getPath ();
if (!System.IO.File.Exists (dbPath)) {
//建立資料庫
db = new DbAccess ("data source=" + dbPath);
//建立資料庫表，與欄位
SqliteDataReader reader= db.CreateTable ("user", new string[]{ "name", "age", "sex", "adress" }, new string[]{ "text", "integer", "text", "text" });
if (reader != null)
Debug.Log ("create tabel success");
else
Debug.LogError ("create tabel fail");
} else db = new DbAccess ("data source=" + dbPath);
//關閉物件
//db.CloseSqlConnection();
}
string getPath(){
string path=Application.dataPath+"/"+dbName;
#if UNITY_EDITOR
path=Application.streamingAssetsPath+"/"+dbName;
if (!System.IO.Directory.Exists (path)){
// System.IO.DirectoryInfo dir=new System.IO.DirectoryInfo(Application.streamingAssetsPath);
// dir.Create();
System.IO.Directory.CreateDirectory(Application.streamingAssetsPath);
}
#elif UNITY_ANDROID
path=Application.persistentDataPath+"/"+dbName;
#elif UNITY_IOS
path=Application.persistentDataPath+"/"+dbName;
#endif
Debug.Log (Application.dataPath);
Debug.Log (Application.persistentDataPath);
Debug.Log (Application.temporaryCachePath);
Debug.Log (path);
return path;
}
void OnDestroy(){
Debug.Log ("<color=#00ff00>close database</color>");
//關閉物件
db.CloseSqlConnection();
}
void InsertData(){
db.InsertInto ("user", new string[]{ "'zhangsan'","11","'man'","'beijing'"});
db.InsertInto ("user", new string[]{ "'lisi'","11","'woman'","'huoying'"});
}
void UpdateData(){
db.UpdateInto ("user",new string[]{ "age", "sex"}, new string[]{ "82", "'woman'" },"name","'zhangsan'");
}
void DeleteData(){
db.Delete ("user",new string[]{ "age", "sex"}, new string[]{ "82", "'woman'" });
}
void QueryData(){
string query = "select * from user where name='zhangsan'";
SqliteDataReader reader=db.ExecuteQuery (query);
while(reader.Read()){
Debug.Log ("name="+reader["name"]);
Debug.Log ("age="+reader["age"]);
Debug.Log ("sex="+reader["sex"]);
Debug.Log ("adress="+reader["adress"]);
}
}
void SelectData(){
// "select (name,age,sex) from user where age > 20";
SqliteDataReader reader= db.SelectWhere ("user",new string[]{"name","age","sex"},new string[]{"age"},new string[]{">"},new string[]{"20"});
while(reader.Read()){
Debug.Log ("name="+reader["name"]);
Debug.Log ("age="+reader["age"]);
Debug.Log ("sex="+reader["sex"]);
}
}
void OnGUI() {
if (GUI.Button (new Rect (10, 20, 100, 40), "insert data")) {
InsertData ();
} else if (GUI.Button (new Rect (10, 80, 100, 40), "delete data")) {
DeleteData ();
} else if (GUI.Button (new Rect (10, 120, 100, 40), "updata data")) {
UpdateData ();
} else if (GUI.Button (new Rect (10, 180, 100, 40), "query data")) {
QueryData ();
} else if (GUI.Button (new Rect (10, 250, 100, 40), "select data")) {
SelectData ();
}
else if (GUI.Button (new Rect (180, 20, 100, 40), "query all data")) {
SqliteDataReader reader= db.ReadFullTable("user");
int count = 0;
while(reader.Read()){
count++;
// Debug.Log ("name="+reader["name"]);
// Debug.Log ("age="+reader["age"]);
// Debug.Log ("sex="+reader["sex"]);
// Debug.Log ("adress="+reader["adress"]);
Debug.Log ("name=" + reader ["name"] + ",age=" + reader ["age"] + ",sex=" + reader ["sex"] + ",adress=" + reader ["adress"]);
}
Debug.Log ("count="+count);
}
}
}
資源導包時報錯：ArgumentException: The Assembly System.Configuration is referenced by System.Data (‘Assets/plugins/System.Data.dll’). But the dll is not allowed to be included or could not be found.
解決方法：在PlaySettings－－other setting 中修改Api Compatibility Level 改成.NET 2.0
下載內容是一個unity資源包，拖到專案中之後，建立一個空場景，把SqliteTest1.cs掛載到相機上面，就可以執行測試。