【WPF学习笔记】之如何保存画面上新建的数据到数据库中并且删除画面上的数据和数据库的数据：动画系列之（五）

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承接系列四后续：

首先，我要在用户控件2中添加“保存”，“删除”按钮。

XAML代码：

<UserControl x:Class="User.uc_item"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
             mc:Ignorable="d"
             d:DesignHeight="50" d:DesignWidth="1920">
    <Viewbox>
        <StackPanel Width="1920" Height="50" Orientation="Horizontal" HorizontalAlignment="Left">
            <TextBox x:Name="tb_id" Width="120" FontSize="20" FontWeight="Bold" HorizontalContentAlignment="Center" VerticalContentAlignment="Center" BorderThickness="1"/>
            <TextBox x:Name="tb_uploader" Width="120" FontSize="20" FontWeight="Bold" HorizontalContentAlignment="Center" VerticalContentAlignment="Center" BorderThickness="1"/>
            <TextBox x:Name="cb_type2" Width="120" FontSize="20" FontWeight="Bold" HorizontalContentAlignment="Center" VerticalContentAlignment="Center" BorderThickness="1"/>
            <ComboBox x:Name="cb_type" Width="120" FontSize="20" FontWeight="Bold" HorizontalContentAlignment="Center" VerticalContentAlignment="Center" BorderThickness="1"/>
            <TextBox x:Name="tb_describe" Width="660" FontSize="20" FontWeight="Bold" HorizontalContentAlignment="Center" VerticalContentAlignment="Center" BorderThickness="1"/>
            <DatePicker x:Name="dp_date" Width="220" FontSize="18" FontWeight="Bold" HorizontalContentAlignment="Center" VerticalContentAlignment="Center" BorderThickness="1"/>
            <DatePicker x:Name="dp_date2" Width="220" FontSize="18" FontWeight="Bold" HorizontalContentAlignment="Center" VerticalContentAlignment="Center" BorderThickness="1"/>
            <Button x:Name="btn_save"  FontSize="20" FontWeight="Bold" Width="80" Height="50" HorizontalContentAlignment="Center" VerticalContentAlignment="Center" BorderThickness="1" Content="保存" Click="btn_save_Click"  Background="Bisque"/>
            <Button x:Name="btn_delete"  FontSize="20" FontWeight="Bold" Width="80" Height="50" HorizontalContentAlignment="Center" VerticalContentAlignment="Center" BorderThickness="1" Content="删除" Click="btn_delete_Click"  Background="Bisque"/>
        </StackPanel>
    </Viewbox>
</UserControl>

然后，编辑“保存按钮”和“删除按钮”的后台代码，前提是编写Word表的类，如下：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data.SqlClient;
using System.Data;

namespace User.sqlHelper
{
    [Serializable]
    class Word
    {
        public Word()
        {

        }

        #region model

        private int _wordID;
        private int _submitterID;
        private string _currentStatus;
        private string _submitStatus;
        private string _wordDescribe;
        private DateTime _submitTime;
        private DateTime _lastTime;

        public int WordID
        {
            set { _wordID = value; }
            get { return _wordID;  }
        }

        public int SubmitterID
        {
            set { _submitterID = value; }
            get { return _submitterID;  }
        }

        public string CurrentStatus
        {
            set { _currentStatus = value; }
            get { return _currentStatus;  }
        }

        public string SubmitStatus
        {
            set { _submitStatus = value; }
            get { return _submitStatus;  }
        }

        public string WordDescribe
        {
            set { _wordDescribe = value; }
            get { return _wordDescribe;  }
        }

        public DateTime SubmitTime
        {
            set { _submitTime = value; }
            get { return _submitTime;  }
        }

        public DateTime LastTime
        {
            set { _lastTime = value; }
            get { return _lastTime;  }
        }

        #endregion model

        #region model

        public Word(int wordID)
        {
            StringBuilder strSql = new StringBuilder();
            strSql.Append("select WordID,SubmitterID,CurrentStatus,SubmitStatus,WordDescribe,SubmitTime,LastTime ");
            strSql.Append(" FROM [Word] ");
            strSql.Append(" where WordID=@wordID");

            SqlParameter[] parameter = {
                    new SqlParameter("@wordID",SqlDbType.Int, )};
            parameter[].Value = wordID;

            DataSet ds = DbHelperSQL.Query(strSql.ToString(), parameter);
            DataTable dt = ds.Tables[];
            if(ds.Tables[].Rows.Count > )
            {
                if (dt.Rows[]["WordID"] != null) { this.WordID = int.Parse(dt.Rows[]["WordID"].ToString().Trim()); }
                if (dt.Rows[]["SubmitterID"] != null) { this.SubmitterID = int.Parse(dt.Rows[]["SubmitterID"].ToString().Trim()); }
                if (dt.Rows[]["CurrentStatus"] != null) { this.CurrentStatus = dt.Rows[]["CurrentStatus"].ToString().Trim(); }
                if (dt.Rows[]["SubmitStatus"] != null) { this.SubmitStatus = dt.Rows[]["SubmitStatus"].ToString().Trim(); }
                if (dt.Rows[]["WordDescribe"] != null) { this.WordDescribe = dt.Rows[]["WordDescribe"].ToString().Trim(); }
                if (dt.Rows[]["SubmitTime"] != null) { this.SubmitTime = DateTime.Parse(dt.Rows[]["SubmitTime"].ToString().Trim()); }
                if (dt.Rows[]["LastTime"] != null) { this.LastTime = DateTime.Parse(dt.Rows[]["LastTime"].ToString().Trim()); }
            }
        }

        //添加一条数据
        public int Add(int submitterid, string currentstatus, string submitstatus, string worddescribe, DateTime submittime, DateTime lasttime)
        {
            StringBuilder strSql = new StringBuilder();
            strSql.Append("insert into [Word] (");
            strSql.Append("SubmitterID,CurrentStatus,SubmitStatus,WordDescribe,SubmitTime,LastTime)");
            strSql.Append(" values (");
            strSql.Append(" @submitterID,@currentStatus,@submitStatus,@wordDescride,@submitTime,@lastTime)");

            SqlParameter[] parameter = {
                    new SqlParameter("@submitterID", SqlDbType.Int, ),
                    new SqlParameter("@currentStatus", SqlDbType.VarChar, ),
                    new SqlParameter("@submitStatus", SqlDbType.VarChar, ),
                    new SqlParameter("@wordDescride", SqlDbType.VarChar, ),
                    new SqlParameter("@submitTime", SqlDbType.DateTime),
                    new SqlParameter("@lastTime", SqlDbType.DateTime)};
            parameter[].Value = submitterid;
            parameter[].Value = currentstatus;
            parameter[].Value = submitstatus;
            parameter[].Value = worddescribe;
            parameter[].Value = submittime;
            parameter[].Value = lasttime;

            object obj = DbHelperSQL.GetSingle(strSql.ToString(), parameter);
            if (obj == null)
            {
                return ;
            }
            else
            {
                return Convert.ToInt32(obj);
            }
        }

        //更新一条数据
        public bool Update(int submitterid, string currentstatus, string submitstatus, string worddescribe, DateTime submittime, DateTime lasttime, int wordid)
        {
            StringBuilder strSql = new StringBuilder();
            strSql.Append("update [Word] set ");
            strSql.Append("SubmitterID=@submitterID,CurrentStatus=@currentStatus,SubmitStatus=@submitStatus,WordDescribe=@wordDescribe,SubmitTime=@submitTime,LastTime=@lastTime");
            strSql.Append(" where WordID=@wordID");
            SqlParameter[] parameter = {
                    new SqlParameter("@submitterID",SqlDbType.Int, ),
                    new SqlParameter("@currentStatus",SqlDbType.VarChar, ),
                    new SqlParameter("@submitStatus",SqlDbType.VarChar, ),
                    new SqlParameter("@wordDescribe",SqlDbType.VarChar, ),
                    new SqlParameter("@submitTime",SqlDbType.DateTime),
                    new SqlParameter("@lastTime",SqlDbType.DateTime),
                    new SqlParameter("@wordID",SqlDbType.Int, )};
            parameter[].Value = submitterid;
            parameter[].Value = currentstatus;
            parameter[].Value = submitstatus;
            parameter[].Value = worddescribe;
            parameter[].Value = submittime;
            parameter[].Value = lasttime;
            parameter[].Value = wordid;

            int rows = DbHelperSQL.ExecuteSql(strSql.ToString(), parameter);
            if(rows > )
            {
                return true;
            }
            else
            {
                return false;
            }
        }

        //删除一条数据
        public bool Delete(int wordID)
        {
            StringBuilder strSql = new StringBuilder();
            strSql.Append("delete from [Word] ");
            strSql.Append(" where WordID=" + wordID.ToString());

            int rows = DbHelperSQL.ExecuteSql(strSql.ToString());
            if(rows > )
            {
                return true;
            }
            else
            {
                return false;
            }
        }

        //获取表数据
        public DataSet GetList()
        {
            StringBuilder strSql = new StringBuilder();
            strSql.Append("select * ");
            strSql.Append(" FROM [Word]");
            return DbHelperSQL.Query(strSql.ToString());
        }

        #endregion model
    }
}

对应数据库建的表：

然后编译保存和删除按钮：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
using User.sqlHelper;
using System.Data;
using Microsoft.Win32;
using System.IO;

namespace User
{
    /// <summary>
    /// uc_item.xaml 的交互逻辑
    /// </summary>
    public partial class uc_item : UserControl
    {
        public uc_item()
        {
            InitializeComponent();
        }

        //用户控件2下拉框初始值
        public void loadCombobox()
        {

            //申请者状态
            ComboBoxItem cbitem1 = new ComboBoxItem();
            cb_type.Items.Add(cbitem1);
            cbitem1.Content = "已提交";

            //审批者状态
            ComboBoxItem cbitem2 = new ComboBoxItem();
            cb_type.Items.Add(cbitem2);
            cbitem2.Content = "已审批";

            ComboBoxItem cbitem3 = new ComboBoxItem();
            cb_type.Items.Add(cbitem3);
            cbitem3.Content = "未审批";

            //执行人状态
            ComboBoxItem cbitem4 = new ComboBoxItem();
            cb_type.Items.Add(cbitem4);
            cbitem4.Content = "已执行";

            //ComboBoxItem cbitem2 = new ComboBoxItem();
            //cb_type.Items.Add(cbitem2);
            //cbitem2.Content = "UI";

            //ComboBoxItem cbitem3 = new ComboBoxItem();
            //cb_type.Items.Add(cbitem3);
            //cbitem3.Content = "其他";

            ////审批者状态
            //ComboBoxItem cbitemL1 = new ComboBoxItem();
            //cb_type.Items.Add(cbitemL1);
            //cbitemL1.Content = "已审批";

            //ComboBoxItem cbitemL2 = new ComboBoxItem();
            //cb_type.Items.Add(cbitemL2);
            //cbitemL2.Content = "未审批";

            ////执行人状态
            //ComboBoxItem cbitemR1 = new ComboBoxItem();
            //cb_type.Items.Add(cbitemR1);
            //cbitemR1.Content = "已执行";

            //ComboBoxItem cbitemR2 = new ComboBoxItem();
            //cb_result.Items.Add(cbitemR2);
            //cbitemR2.Content = "否";
        }

        //初始化表word的id
        int wordid = ;

        //保存按钮
        private void btn_save_Click(object sender, RoutedEventArgs e)
        {
            if (MainWindow.isnew)
            {
                //查询用户表信息，如果用户名一致，就把id号传递到word表
                User_test _u = new User_test();
                DataSet _ds = _u.GetList();
                if (_ds != null)
                {
                    DataTable _dt = _ds.Tables[];
                    for (int i = ; i < _dt.Rows.Count; i++)
                    {
                        string UserName = _dt.Rows[i]["UserName"].ToString().Trim();
                        int UserID = int.Parse(_dt.Rows[i]["UserID"].ToString().Trim());
                        if (this.tb_uploader.Text.Equals(UserName))
                        {
                            wordid = UserID;
                        }
                    }
                }

                //设置到插入数据到Word表
                //初始化Word表
                Word _w = new Word();
                //当前状态
                if (this.cb_type2.Text == "")
                {
                    cb_type2.Text = "未";
                }
                //提交日期
                if (dp_date.Text == "")
                {
                    dp_date.Text = System.DateTime.Now.ToShortTimeString();
                }
                //最后更改时间
                if (dp_date2.Text == "")
                {
                    dp_date2.Text = System.DateTime.Now.ToShortTimeString();
                }

                //插入数据库
                _w.Add(wordid, cb_type2.Text, cb_type.Text, tb_describe.Text, System.DateTime.Parse(dp_date.Text), System.DateTime.Parse(dp_date2.Text));

                //更新Word表的id
                Word _w1 = new Word();
                DataSet _ds1 = _w1.GetList();
                if (_ds1 != null)
                {
                    DataTable _dt1 = _ds1.Tables[];
                    for (int i = ; i < _dt1.Rows.Count; i++)
                    {
                        this.tb_id.Text = _dt1.Rows[_dt1.Rows.Count - ]["WordID"].ToString().Trim();
                    }
                }
            }
            else
            {
                //目的：从User表取出id继续赋给Word表
                User_test _u = new User_test();
                DataSet _ds = _u.GetList();
                if(_ds != null)
                {
                    DataTable _dt = _ds.Tables[];
                    for (int i = ; i < _dt.Rows.Count; i++)
                    {
                        int userid = int.Parse(_dt.Rows[i]["UserID"].ToString().Trim());
                        string UserName = _dt.Rows[i]["UserName"].ToString().Trim();
                        if (tb_uploader.Text.Equals(UserName))
                        {
                            wordid = userid;
                        }
                    }
                }

                //更新word表数据库中
                //初始化Word表
                Word _w = new Word();
                //更新
                _w.Update(wordid, cb_type2.Text, cb_type2.Text, tb_describe.Text, System.DateTime.Parse(dp_date.Text), System.DateTime.Parse(dp_date2.Text), int.Parse(tb_id.Text));

            }
            //设置是否新建为false
            MainWindow.isnew = false;
            //弹出消息成功
            MessageBox.Show("保存成功！");
        }

        //删除按钮
        private void btn_delete_Click(object sender, RoutedEventArgs e)
        {
            Word _w = new Word();
            MessageBoxResult mbr = MessageBox.Show("是否确定删除！","删除提示", MessageBoxButton.YesNoCancel);
            if (mbr == MessageBoxResult.Yes)
            {
                //删除数据库对应的值
                _w.Delete(int.Parse(tb_id.Text));
                //移除用户控件2
                (this.Parent as StackPanel).Children.Remove(this);
                MessageBox.Show("删除成功！");
            }
        }

    }
}

结果图：

点击保存：

查看数据库：

然后，我再点击删除按钮。

点击删除后查看数据库：

数据已经删除。