两个类,DbAccess和TestDB
TestDB类测试,创建数据库,创建数据表,插入数据,更新数据,删除数据,查询数据
using UnityEngine; using System.Collections; using Mono.Data.Sqlite; using System.IO; public class TestDB : MonoBehaviour { DbAccess db; //数据库 string appDBPath; //数据库路径 string name; int age; float exp; //创建数据库 void CreateDataBase() { #if UNITY_EDITOR appDBPath = Application.dataPath + "/Test.db"; #elif UNITY_STANDALONE_WIN appDBPath = Application.dataPath + "/Test.db"; #elif UNITY_ANDROID appDBPath = Application.persistentDataPath + "/Test.db"; //判断路径内数据库是否存在 if(!File.Exists(appDBPath))= { //拷贝数据库 StartCoroutine(CopyDataBase()); } #elif UNITY_IPHONE appDBPath = Application.persistentDataPath + "/Test.db"; //判断路径内数据库是否存在 if(!File.Exists(appDBPath)) { //拷贝数据库 StartCoroutine(CopyDataBase()); } #endif //"URI=file:" 必须添加 db = new DbAccess ("URI=file:" + appDBPath); } //拷贝数据库 IEnumerator CopyDataBase() { //用www先从unity中下载数据库 //Application.streamingAssetsPath #if UNITY_IPHONE WWW loadDB = new WWW(Application.dataPath + "/Raw" + "/Test.db"); #elif UNITY_ANDROID WWW loadDB = new WWW("jar:file://" + Application.dataPath + "!/assets" + "/Test.db"); #elif UNITY_EDITOR||UNITY_STANDALONE_WIN WWW loadDB = new WWW( Application.dataPath + "/Test.db"); #endif yield return loadDB; //拷贝数据库 File.WriteAllBytes (appDBPath, loadDB.bytes); } void OnGUI() { if (GUILayout.Button ("创建数据库")) CreateDataBase (); if (GUILayout.Button ("创建数据表")) CreateTable (); if (GUILayout.Button ("插入数据")) InsertData (); if (GUILayout.Button ("更新数据")) UpdateData (); if (GUILayout.Button ("删除数据")) DeleteData (); if (GUILayout.Button ("查询数据")) FindData (); GUILayout.Label ("name:" + name); GUILayout.Label ("age:" + age); GUILayout.Label ("exp:" + exp); GUILayout.Label ("path:" + appDBPath); } //创建表 void CreateTable() { //打开数据库 CreateDataBase (); //创建数据库表 db.CreateTable ("role", new string[]{"id","name", "age","lv","exp"}, new string[]{"int","text", "int","int","float"}); //关闭数据库 db.CloseSqlConnection (); } //插入数据 void InsertData() { CreateDataBase (); //插入数据 db.InsertInto ("role", new string[] {"1","'张三'","18","1","1.2"}); db.CloseSqlConnection (); } //更新数据 void UpdateData() { CreateDataBase (); db.UpdateInto ("role",new string[]{"lv","exp"}, new string[]{"10","100"},"id","1"); db.CloseSqlConnection (); } //删除数据 void DeleteData() { CreateDataBase (); db.Delete ("role",new string[]{"id","id"}, new string[]{"1","2"}); db.CloseSqlConnection (); } //查找数据 void FindData() { CreateDataBase (); SqliteDataReader sqReader = db.SelectWhere ("role", new string[]{"name","age","exp"}, new string[]{"id"},new string[]{"="}, new string[]{"3"}); while(sqReader.Read()) { name = sqReader.GetString (sqReader.GetOrdinal("name")); age = sqReader.GetInt32 (sqReader.GetOrdinal("age")); exp = sqReader.GetFloat (sqReader.GetOrdinal("exp")); } Debug.Log ("name:" + name); db.CloseSqlConnection (); } }
DbAccess,链接数据库
using UnityEngine; using System; using System.Collections; using Mono.Data.Sqlite; public class DbAccess { private SqliteConnection dbConnection; private SqliteCommand dbCommand; private SqliteDataReader reader; public DbAccess (string connectionString) { OpenDB (connectionString); } public DbAccess () { } public void OpenDB (string connectionString) { try { dbConnection = new SqliteConnection (connectionString); dbConnection.Open (); Debug.Log ("Connected to db,连接数据库成功!"); } catch(Exception e) { string temp1 = e.ToString(); Debug.Log(temp1); } } 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.关闭数据库!"); } public SqliteDataReader ExecuteQuery (string sqlQuery) { dbCommand = dbConnection.CreateCommand (); dbCommand.CommandText = sqlQuery; reader = dbCommand.ExecuteReader (); return reader; } public SqliteDataReader ReadFullTable (string tableName) { string query = "SELECT * FROM " + tableName; return ExecuteQuery (query); } /// <summary> /// 插入数据 param tableName=表名 values=数据内容 /// </summary> 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[i]; } query += ")"; return ExecuteQuery (query); } /// <summary> /// 插入数据 param tableName=表名 cols=更新字段 colsvalues=更新内容 selectkey=查找字段(主键) selectvalue=查找内容 /// </summary> 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[i]+" ="+ colsvalues[i]; } query += " WHERE "+selectkey+" = "+selectvalue+" "; return ExecuteQuery (query); } /// <summary> /// 删除数据 param tableName=表名 cols=字段 colsvalues=内容 /// </summary> 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[i]+" = "+ colsvalues[i]; } return ExecuteQuery (query); } 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[i]; } query += ") VALUES (" + values[0]; for (int i = 1; i < values.Length; ++i) { query += ", " + values[i]; } query += ")"; return ExecuteQuery (query); } public SqliteDataReader DeleteContents (string tableName) { string query = "DELETE FROM " + tableName; return ExecuteQuery (query); } /// <summary> /// 创建表 param name=表名 col=字段名 colType=字段类型 /// </summary> 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[i] + " " + colType[i]; } query += ")"; return ExecuteQuery (query); } /// <summary> /// 插入数据 param tableName=表名 items=结果字段 col=查找字段 operation=运算符 values=内容 /// </summary> 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[i]; } query += " FROM " + tableName + " WHERE " + col[0] + operation[0] + "'" + values[0] + "' "; for (int i = 1; i < col.Length; ++i) { query += " AND " + col[i] + operation[i] + "'" + values[0] + "' "; } return ExecuteQuery (query); } }