mono for android中使用dapper或petapoco对sqlite进行数据操作

在mono for android中使用dapper或petapoco,很简单,新建android 类库项目,直接把原来的文件复制过来,对Connection连接报错部分进行注释和修改就可以运行了.(用可移植类库PCL项目也可以的.)

如果需要源码可以联系我.10元收费哈..

 

以下内容包括

1.在安卓中创建sqlite数据库;

2.检查数据库是否存在;

3.返回数据库路径;

4.插入数据(前置知识,dapper的使用方法或petapoco的);

5.查询数据;

本人小菜鸟一枚,以下代码写得很烂,希望有好的想法可以指点下我.

 

知识点提示

1.安卓sqlite数据提交,默认每一次都是事务提交,所以如果不采用一次性全部事务提交,会造成很多事务的建立.也就是把提交部分,用一个事务包起来,不要不用事务.否则很慢.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Android.App;
using Android.Content;
using Android.OS;
using Android.Runtime;
using Android.Views;
using Android.Widget;

using System.IO;
using Mono.Data.Sqlite;
using System.Data;
using Android.Util;
using Microsoft.CSharp;
using Mono.CSharp;
using Dapper;
using BaseModel;
using PetaPocoForMobile;

namespace monoandroid1.Controllers
{
    [Activity(Label = "启动页", MainLauncher = true, Icon = "@drawable/icon")]
    public class Start : Activity
    {
        private TextView tips;
        private EditText keyword;

        protected override void OnCreate(Bundle bundle)
        {
            base.OnCreate(bundle);

            // Create your application here
            SetContentView(Resource.Layout.Main);
            tips = FindViewById<TextView>(Resource.Id.Results);

            Button BtCreatDatabase = FindViewById<Button>(Resource.Id.CreatDatabase);
            BtCreatDatabase.Click += new EventHandler(CreatDatabase);

            Button BtImportData = FindViewById<Button>(Resource.Id.ImportData);
            BtImportData.Click += delegate { ImportData(); };

            Button BtDataDisplay = FindViewById<Button>(Resource.Id.DataDisplay);
            BtDataDisplay.Click += delegate
            {
                keyword = FindViewById<EditText>(Resource.Id.Input);
                tips.Text = DataDisplay(keyword.Text) == null ? "查询不到" : DataDisplay(keyword.Text).UserName;
            };

            Button BtCheckDatabase = FindViewById<Button>(Resource.Id.CheckDatabase);
            BtCheckDatabase.Click += delegate
            {
                CheckDatabase("/data/data/monoandroid1.monoandroid1/files/UserData.db3");
            };
        }
        /// <summary>
        /// 创建数据库
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        protected void CreatDatabase(object sender, EventArgs e)
        {
            string databaseName = "UserData.db3";
            string dbFilePath = GetDatabaseFilePath(databaseName);
            bool existsDB = CheckDatabase(dbFilePath);
            if (existsDB == true)
            {
                SqliteConnection.CreateFile(dbFilePath);
            }

            var conn = new SqliteConnection("Data Source=" + dbFilePath);
            var commands = new[]
            {
                "drop table if exists dog",
                "create table if not exists dog (UserId integer primary key autoincrement, UserName varchar(20),Age int,Address varchar(50))",
            };
            try
            {
                if (conn.State == ConnectionState.Broken)
                    conn.Close();
                if (conn.State == ConnectionState.Closed)
                {
                    conn.Open();
                }

                foreach (string cmd in commands)
                    using (SqliteCommand sqlitecmd = conn.CreateCommand())
                    {
                        sqlitecmd.Connection = conn;
                        sqlitecmd.CommandText = cmd;
                        sqlitecmd.CommandType = CommandType.Text;
                        //conn.Open();
                        sqlitecmd.ExecuteNonQuery();
                        //conn.Close();
                    }

                tips.Text = "数据库创建成功";
            }
            catch (System.Exception sysExc)
            {
                tips.Text = "Exception: " + sysExc.Message;
            }
            finally
            {
                if (conn.State != ConnectionState.Closed)
                {
                    conn.Close();
                }
                conn.Dispose();
            }
        }

        /// <summary>
        /// 返回数据库完整路径
        /// </summary>
        /// <param name="databaseName">数据库名</param>
        /// <returns>返回数据库完整路径</returns>
        private string GetDatabaseFilePath(string databaseName)
        {
            string documents = System.Environment.GetFolderPath(System.Environment.SpecialFolder.Personal);
            string dbFilePath = Path.Combine(documents, databaseName);
            return dbFilePath;
        }

        /// <summary>
        /// 检查数据库是否存在
        /// </summary>
        /// <param name="dbFilePath"></param>
        /// <returns>true不存在,false已经存在</returns>
        private bool CheckDatabase(string dbFilePath)
        {
            bool exists = File.Exists(dbFilePath);
            if (!exists)
            {
                //SqliteConnection.CreateFile(dbFilePath);
                tips.Text = "数据库不存在";
                Log.Info("CreateFile", "路径不存在数据库,并创建数据库");
                return true;
            }
            else
            {
                tips.Text = "数据库已经存在";
                Log.Info("CreatFile", "已经存在数据库,放弃创建");
                return false;
            }
        }
        private SqliteConnection OpenDatabase()
        {
            string databaseName = "UserData.db3";
            string dbFilePath = GetDatabaseFilePath(databaseName);
            //<add name="ConnectionStringName" connectionString="sever=服务器名;database=数据库名;User ID=用户;Password=密码"  providerName="System.Data.SqlClient" />
            //<add name="ConnectionStringName" connectionString="Data Source=服务器名;Initial Catalog=数据库名;User ID=用户;Password=密码"  providerName="System.Data.SqlClient" /> 
            string connectionstr = "Data Source=" + dbFilePath;
            SqliteConnection connection = new SqliteConnection(connectionstr);
            if (connection.State == ConnectionState.Broken)
                connection.Close();
            if (connection.State == ConnectionState.Closed)
            {
                connection.Open();
            }

            return connection;
        }
        /// <summary>
        /// 导入数据
        /// </summary>
        protected void ImportData()
        {
            //dapper版
            //            List<Dog> Dogs = new List<Dog>();
            //            for (int i = 0; i < 100000; i++)
            //            {

            //                Dogs.Add(new Dog { UserId = i, UserName = "DogName" + i.ToString(), Age = i, Address = "ADD" + i.ToString()  });

            //            }
            //            string sql ="INSERT INTO dog (UserId,UserName,Age,Address) VALUES (@UserId,@UserName,@Age,@Address)";
            //            using (SqliteConnection connection = OpenDatabase())
            //            {
            //                //SqlConnection connection = GetOpenConnection(sqlconnectionString);
            //                //插入100000条数据到数据库
            //                DateTime starttime = DateTime.Now;
            //                TimeSpan timespan;
            //                int records = 0;

            //                using (var trans = connection.BeginTransaction())
            //                {
            //                    try
            //                    {
            //                        records += connection.Execute(sql, Dogs, trans, 30, CommandType.Text);
            ////                         for (int i = 0; i < 100000; i++)
            ////                         {
            ////                             connection.Execute("INSERT INTO dog (UserId,UserName,Age,Address) VALUES (@UserId,@UserName,@Age,@Address)",
            ////                                 new { );//System.Guid.NewGuid().ToString()全球唯一标识符 (GUID) 是一个字母数字标识符，用于指示产品的唯一性安装。
            ////                         }
            //                    }
            //                    catch (DataException ex)
            //                    {
            //                        trans.Rollback();
            //                        throw ex;
            //                    }
            //                    finally
            //                    {
            //                        trans.Commit();
            //                        timespan = DateTime.Now.Subtract(starttime);//获取就是开始时间很结束时间差
            //                        if (connection.State != ConnectionState.Closed)
            //                        {
            //                            connection.Close();
            //                        }
            //                        connection.Dispose();
            //                        tips.Text = "数据导入完成" + timespan.ToString();
            //                    }
            //                }
            //            }

            //petapoco版

            //var db = new PetaPocoForMobile.Database(OpenDatabase());
            //SqliteConnection connection = OpenDatabase()
            using (SqliteConnection connection = OpenDatabase())
            {
                int records = 0;
                using (var db = new PetaPocoForMobile.Database(connection))
                {
                    List<Dog> Dogs = new List<Dog>();
                    for (int i = 0; i < 10000; i++)
                    {
                        Dogs.Add(new Dog { UserId = i, UserName = "DogName" + i.ToString(), Age = i, Address = "ADD" + i.ToString() });
                    }
                    DateTime starttime = DateTime.Now;
                    TimeSpan timespan;
                    using (var ts = db.GetTransaction())
                    {
                        try
                        {
                            //插入100000条数据到数据库
                            foreach (Dog item in Dogs)
                            {
                                db.Insert("dog", "UserId", item);//速度稍微慢点点,没多少差别
                                //db.Execute("INSERT INTO dog (UserId,UserName,Age,Address) VALUES (@0,@1,@2,@3)", item.UserId, item.UserName, item.Age, item.Address);
                            }
                            ts.Complete();
                        }
                        catch (Exception ex)
                        {
                            throw ex;
                        }
                        finally
                        {
                            timespan = DateTime.Now.Subtract(starttime);//获取就是开始时间很结束时间差
                            if (connection.State != ConnectionState.Closed)
                            {
                                connection.Close();
                            }
                            connection.Dispose();
                            tips.Text = "数据导入完成" + timespan.ToString();
                        }
                    }
                }

            }

        }



        /// <summary>
        /// 根据ID查询单条数据
        /// </summary>
        /// <param name="keyword"></param>
        /// <returns></returns>
        protected Dog DataDisplay(string keyword)
        {
            SqliteConnection connection = OpenDatabase();
            //获取单条记录
            //var edog = connection.Query<Dog>("select * from dog where id = @Id", new { Id = 2 }).Single<Dog>();
            //var edog = connection.Query<Dog>("select * from dog where UserId = @UserId", new { UserId = keyword }).SingleOrDefault<Dog>();
            try
            {
                var edog = connection.Query<Dog>("select * from dog where UserId = @UserId", new { UserId = keyword }).SingleOrDefault<Dog>();
                return edog;
            }
            catch (System.Exception sysExc)
            {
                //tips.Text = "Exception: " + sysExc.Message;
                //Log.Info("e", "Exception: " + sysExc.Message);

                return null;
            }
            finally
            {
                if (connection.State != ConnectionState.Closed)
                {
                    connection.Close();
                }
                connection.Dispose();
            }
        }


    }
}