基于wince系统开发的 SQLServe Mobile数据库应用

SQLServe Mobile数据库以前的版本是SQLServe CE，现在最新的是3.5的版本，最近用vs2008做了一个小程序，是对SQLServe Mobile数据库读写数据。

注：SQLServe Mobile数据库安装已经有人写过了，这里不再赘述。

1、界面是四个button按钮，分别是“插入数据”、“读取数据”、“删除数据”、“退出系统”和一个detagrid控件；两个textbox控件，方便录入插入的数据。

数据库文件时myDB.sdf  用SQL Server2008创建的，方法是：打开连接，服务器类型选择“SQL Server Compact
Edition”，数据库文件选择“创建新数据库”，然后根据提示创建数据库文件。需要注意的是，加密类型选择后两种，然后把数据库文件放到设备的NandFlash里（我测试用的设备是飞淩家的TE6410）。

项目中要引用“System.Data.SqlServerCe”，并且需要添加三个dll文件：sqlceme35.dll，sqlceqp35.dll，sqlcese35.dll，开发平台不安装SQLServe Mobile数据库是不能引用“System.Data.SqlServerCe”的，我安装的是英文版的Mobile数据库，这些文件在网上都能找到。

2、代码

public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
         /// <summary>
         /// 定义连接字符串
         /// </summary>
         ///
        public string connectionString = "Data Source=\\NandFlash\\myDB.sdf;Database Password=xxxxx;";
        private void button_Insert_Click(object sender, EventArgs e)
        {
            APP_function.CloseKeyBoard();//关闭软键盘
            string name = this.textBox_Name.Text;
            string pass = this.textBox_Pass.Text;
            SqlCeParameter[] sqlParameters=new SqlCeParameter[2];
            sqlParameters[0] = new SqlCeParameter("@Name", textBox_Name.Text);
            sqlParameters[1] = new SqlCeParameter("@Password", textBox_Pass.Text);
            string sqlCmd = "insert into userinfo (用户名,密码) values (@Name,@Password)";
            if (name != "" || pass != "")
            {
                APP_function.P_ExecuteNonQuery(sqlCmd,connectionString,ref sqlParameters);
                //更新datagrid
                string sqlUpdataCmd = "select * from userinfo order by ID";
                DataSet ds = new DataSet();
                APP_function.ExecuteDataset(sqlUpdataCmd, connectionString, out ds);
                dataGrid_Read.DataSource = ds.Tables[0];
                ifReadSelected = true;
                textBox_Name.Text = "";
                textBox_Pass.Text = "";
            }
            else
            {
                MessageBox.Show("插入的用户名和密码不能为空！");
           
            }
        }

private void button_Read_Click(object sender, EventArgs e)
        {
            string sqlCmd = "select * from userinfo order by ID";
            try
            {
                DataSet ds = new DataSet();
                APP_function.ExecuteDataset(sqlCmd, connectionString, out ds);
                dataGrid_Read.DataSource = ds.Tables[0];
                ifReadSelected = true;
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.ToString());
            }
          
        }

/// <summary>
        /// 定义是否选择了读数据变量ifReadSelected
        /// </summary>
        public static bool ifReadSelected = false;
        private void button_Delete_Click(object sender, EventArgs e)
        {
            if (ifReadSelected)
            {
                //取得主键的值
                DataGridCell selectCell = dataGrid_Read.CurrentCell;
                int id = Convert.ToInt32(dataGrid_Read[selectCell.RowNumber, 0].ToString());
                string sqlCmd = "delete userinfo where ID='" + id + "'";
                APP_function.ExecuteNonQuery(sqlCmd, connectionString);
                //更新datagrid
                string sqlUpdataCmd = "select * from userinfo order by ID";
                DataSet ds = new DataSet();
                APP_function.ExecuteDataset(sqlUpdataCmd, connectionString, out ds);
                dataGrid_Read.DataSource = ds.Tables[0];
            }
            else
            {
                MessageBox.Show("请选择删除的行！","提示");
            }
        }
        private void textBox_Name_GotFocus(object sender, EventArgs e)
        {
            //打开键盘
            APP_function.OpenKeyBoard();
        }

private void textBox_Pass_GotFocus(object sender, EventArgs e)
        {
            //打开键盘
            APP_function.OpenKeyBoard();
        }
        private void button_Exit_Click(object sender, EventArgs e)
        {
            this.Close();
            Application.Exit();
        }
    }

3、APP_function是另外一个类文件，其中定义了需要的功能函数，代码如下：

public partial  class APP_function
    {
       /// <summary>
       /// 打开、关闭软键盘
       /// </summary>
        public static uint SIPF_OFF = 0x00;//软键盘关闭 
        public static uint SIPF_ON = 0x01;//软键盘打开 
        [DllImport("coredll.dll")]
        public extern static void SipShowIM(uint dwFlag);
        public static void OpenKeyBoard()
        {
            SipShowIM(SIPF_ON);
        }
        public static void CloseKeyBoard()
        {
            SipShowIM(SIPF_OFF);
        }
       /// <summary>
       /// 向数据库插入、更新、删除数据(不带参数)
       /// </summary>
       /// <param name="sqlCmd">命令字符串</param>
       /// <param name="connectionString">连接字符串</param>
       ///
        public static void ExecuteNonQuery(string sqlCmd, string connectionString)
        {
            using (SqlCeConnection conn=new SqlCeConnection(connectionString))
            {
                try
                {
                    using (SqlCeCommand cmd = new SqlCeCommand(sqlCmd, conn))
                    {
                        conn.Open();
                        cmd.CommandType = CommandType.Text;
                        cmd.ExecuteNonQuery();
                    }
                }
                catch (Exception e)
                {
                    MessageBox.Show(e.ToString(),"提示");
                }
                finally
                {
                    conn.Close();
                }
            }
        }
        /// <summary>
        /// 带参数向数据库插入、更新、删除数据
        /// </summary>
        /// <param name="sqlCmd">命令字符串</param>
        /// <param name="connectionString">连接字符串</param>
        ///
        static public void P_ExecuteNonQuery(string sqlCmd,string connectionString,ref SqlCeParameter[] sqlParameters)
        {
            using (SqlCeConnection conn = new SqlCeConnection(connectionString))
            {
                try
                {
                    using (SqlCeCommand cmd = new SqlCeCommand(sqlCmd, conn))
                    {
                        conn.Open();
                        cmd.CommandType = CommandType.Text;
                        for (int i = 0; i < sqlParameters.Length;i++ )
                        {
                            cmd.Parameters.Add(sqlParameters[i]);
                        }
                        cmd.ExecuteNonQuery();
                    }
                }
                catch (Exception e)
                {
                    MessageBox.Show(e.ToString(), "提示");
                }
                finally
                {
                    conn.Close();
                }
            }
        }

/// <summary>
        /// 查询数据库，返回dataset
        /// </summary>
        /// <param name="sqlCmd">命令字符串</param>
        /// <param name="connectionString">连接字符串</param>
        /// <param name="connectionString">连接字符串</param>
        ///
        public static void ExecuteDataset(string sqlCmd, string connectionString, out DataSet ds)
        {
            ds = new DataSet();
            using(SqlCeConnection conn=new SqlCeConnection(connectionString))
            {
                try
                {
                    using(SqlCeDataAdapter da=new SqlCeDataAdapter())
                    {
                        da.SelectCommand = new SqlCeCommand(sqlCmd, conn);
                        da.Fill(ds);
                    }
                }
                catch (Exception e)
                {
                    MessageBox.Show(e.ToString());
                }
                finally
                {
                    conn.Close();
                }
            }
        }
    }