Winform中使用mysqldump实现选择部分表定期备份mysql数据库

怼烎@ 2022-09-14 13:22 197阅读 0赞

# 场景 #

Winform中实现与Mysql8建立连接并获取所有的表，然后勾选指定的表，定时进行数据库备份导出为sql文件。并且可以设定覆盖备份的次数，比如设置为7，则备份到第8次时就会将第一次备份的sql文件替换掉。

比如将mysql中的部分表备份近一个月的数据，每天备份一次。

注：

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# 实现 #

1、设计Winform的页面布局如下

![watermark_type_ZHJvaWRzYW5zZmFsbGJhY2s_shadow_50_text_Q1NETiBA6Zy46YGT5rWB5rCT5rCU6LSo_size_20_color_FFFFFF_t_70_g_se_x_16][]

2、首先实现与数据库建立连接

Winform中连接Mysql8并查询表中数据进行显示：

[Winform中连接Mysql8并查询表中数据进行显示\_BADAO\_LIUMANG\_QIZHI的博客-CSDN博客][Winform_Mysql8_BADAO_LIUMANG_QIZHI_-CSDN]

在上面实现连接Mysql8数据库。

3、获取mysqldump.exe的路径

这里的路径是带双引号的，因为路径中有空格，然后获取全路径也是为了保证cmd中执行mysqldump的通用性，因为不一定都将其添加进环境变量。

![watermark_type_ZHJvaWRzYW5zZmFsbGJhY2s_shadow_50_text_Q1NETiBA6Zy46YGT5rWB5rCT5rCU6LSo_size_20_color_FFFFFF_t_70_g_se_x_16 1][]

4、选择备份文件的路径

private void button_select_path_Click(object sender, EventArgs e)
            {
                FolderBrowserDialog path = new FolderBrowserDialog();
                path.ShowDialog();
                this.textBox_bak_path.Text = path.SelectedPath;
            }

5、获取所有表名

private void button_getAllTableNames_Click(object sender, EventArgs e)
            {
                PassForm passForm = new PassForm();
                passForm.ShowDialog();
                if (passForm.DialogResult == DialogResult.OK)
                {
                    DataGridViewColumn checkCol = new DataGridViewCheckBoxColumn();
                    checkCol.Name = "选择";
                    this.dataGridView_show_tables_name.Columns.Add(checkCol);
                    DataTable tbName = mySqlConnection.GetSchema("Tables");
                    if (tbName.Columns.Contains("TABLE_NAME"))
                    {
                        foreach (DataRow dr in tbName.Rows)
                        {
                            tableNameList.Add((string)dr["TABLE_NAME"]);
                        }
                    }
                    this.dataGridView_show_tables_name.DataSource = this.tableNameList.Select(x => new { Value = x }).ToList();
                }
                else
                {
                    MessageBox.Show("密码不正确");
                }
            }

这里为了防止按钮误操作，添加了密码校验，实现方式参考

Winform中实现点击按钮弹窗输入密码验证通过后执行相应逻辑：

[Winform中实现点击按钮弹窗输入密码验证通过后执行相应逻辑\_BADAO\_LIUMANG\_QIZHI的博客-CSDN博客][Winform_BADAO_LIUMANG_QIZHI_-CSDN]

6、全选功能实现

添加一个checkbox并重写其checkchanged事件

private void checkBox1_CheckedChanged(object sender, EventArgs e)
            {
                if (this.checkBox_select_all.Checked == true)
                {
                    for (int i = 0; i < this.dataGridView_show_tables_name.Rows.Count; i++)
                    {
                        this.dataGridView_show_tables_name.Rows[i].Cells["选择"].Value = 1;
                    }
                }
                else
                {
                    for (int i = 0; i < this.dataGridView_show_tables_name.Rows.Count; i++)
                    {
                        this.dataGridView_show_tables_name.Rows[i].Cells["选择"].Value = 0;
                    }
                }
            }

7、页面添加获取覆盖循环的次数和定时器执行的秒数

![watermark_type_ZHJvaWRzYW5zZmFsbGJhY2s_shadow_50_text_Q1NETiBA6Zy46YGT5rWB5rCT5rCU6LSo_size_20_color_FFFFFF_t_70_g_se_x_16 2][]

8、定时器启动

private void button3_Click(object sender, EventArgs e)
            {
                PassForm passForm = new PassForm();
                passForm.ShowDialog();
                if (passForm.DialogResult == DialogResult.OK)
                {
                    string mysqlDumpPath = this.text_mysqldump_path.Text.Trim();
                    string tableName = this.text_one_table.Text.Trim();
                    string bakPath = this.textBox_bak_path.Text.Trim();
                    if (String.IsNullOrEmpty(tableName))
                    {
                        MessageBox.Show("表名不能为空！！！");
                    }
                    else if (String.IsNullOrEmpty(mysqlDumpPath))
                    {
                        MessageBox.Show("mysqldump的路径不能为空！！！");
                    }
                    else if (String.IsNullOrEmpty(bakPath))
                    {
                        MessageBox.Show("备份文件的路径不能为空！！！");
                    }
                    else
                    {
                        decimal interval = this.time_interval.Value * 1000;
                        _timer.Interval = (int)interval;
                        _timer.Tick += _timer_Tick;
                        _timer.Start();
                    }
    
                }
                else
                {
                    MessageBox.Show("密码不正确");
                }
    
            }

实现逻辑是

验证密码-获取需要参数并验证是否为空-获取定时器执行的间隔数-设置定时器执行的事件-启动定时器

其中设置定时器执行的事件中

private void _timer_Tick(object sender, EventArgs e)
            {
               
                this.log_text.AppendText("定时任务执行开始,执行时间:" + DateTime.Now.ToString());
                this.log_text.AppendText("\r\n");
                this.BackupDB();
                int count = this.log_text.Lines.GetUpperBound(0);
                this.log_text.AppendText("count="+count);
                this.log_text.AppendText("\r\n");
                this.log_text.AppendText("定时任务执行结束,执行时间:" + DateTime.Now.ToString());
                this.log_text.AppendText("\r\n");
                if (count>=500)
                {
                    this.log_text.Clear();
                }
    
            }

向一个TextBox中追加日志，并判断日志大于500行之后清理日志。

然后具体执行备份的方法是BackupDB

public void  BackupDB()
    
            {
                this.bakCycleCount = (int)this.numericUpDown_cycle_count.Value;
                this.selectedTableNameList.Clear();
                for (int i = 0; i < this.dataGridView_show_tables_name.Rows.Count; i++)
                {
                    if ((bool)this.dataGridView_show_tables_name.Rows[i].Cells["选择"].EditedFormattedValue == true)
                    {
                        selectedTableNameList.Add(this.dataGridView_show_tables_name.Rows[i].Cells[1].Value.ToString());
                    }
                }
                for (int i = 0; i < this.selectedTableNameList.Count; i++)
                {
                    string mysqlDumpPath = this.text_mysqldump_path.Text.Trim();
                    string tableName = this.selectedTableNameList[i];
                    string cmdStr = mysqlDumpPath + " -h " + this.host.Text.Trim() + " -u" + this.username.Text.Trim() + " -p" + this.password.Text.Trim() + " " + this.database.Text.Trim() + " " + tableName + " > " + "\"" + this.textBox_bak_path.Text.Trim() + "\\" + tableName + "_" + currentBakCount + ".sql\"";
                    CmdHelper.ExeCommand(cmdStr);
                    this.log_text.AppendText(tableName + "_" + currentBakCount + "--备份完成,时间：" + DateTime.Now.ToString());
                    this.log_text.AppendText("\r\n");
                    //休眠1秒
                    Thread.Sleep(1000);
                }
                currentBakCount++;
                if (currentBakCount == bakCycleCount+1)
                {
                    currentBakCount = 1;
                }
            }

在此方法中，获取选中的表名，然后循环这些表名进行备份

拼接成cmd命令，然后单个表进行备份，执行完一个表备份后休眠一秒。

比如执行一个表叫bus\_area,那么设定的覆盖次数为7的话，就会出现

bus\_area\_1.sql、bus\_area\_2.sql一直到bus\_area\_7.sql然后重新覆盖bus\_area\_1.sql

这其中执行cmd命令的工具类为

using System;
    using System.Collections.Generic;
    using System.Linq;
    using System.Text;
    using System.Threading.Tasks;
    
    namespace mysqldatabak
    {
        using System;
        using System.Collections.Generic;
        using System.Text;
        using System.Diagnostics;
    
        namespace Helper
        {
            /// <summary>
            /// 执行命令
            /// </summary>
            public class CmdHelper
            {
                ///
                /// 执行cmd.exe命令
                ///
                ///命令文本
                /// 命令输出文本
                public static string ExeCommand(string commandText)
                {
                    return ExeCommand(new string[] { commandText });
                }
                ///
                /// 执行多条cmd.exe命令
                ///
                ///命令文本数组
                /// 命令输出文本
                public static string ExeCommand(string[] commandTexts)
                {
                    Process p = new Process();
                    p.StartInfo.FileName = "cmd.exe";
                    p.StartInfo.UseShellExecute = false;
                    p.StartInfo.RedirectStandardInput = true;
                    p.StartInfo.RedirectStandardOutput = true;
                    p.StartInfo.RedirectStandardError = true;
                    p.StartInfo.CreateNoWindow = true;
                    string strOutput = null;
                    try
                    {
                        p.Start();
                        foreach (string item in commandTexts)
                        {
                            p.StandardInput.WriteLine(item);
                        }
                        p.StandardInput.WriteLine("exit");
                        strOutput = p.StandardOutput.ReadToEnd();
                        //strOutput = Encoding.UTF8.GetString(Encoding.Default.GetBytes(strOutput));
                        p.WaitForExit();
                        p.Close();
                    }
                    catch (Exception e)
                    {
                        strOutput = e.Message;
                    }
                    return strOutput;
                }
                ///
                /// 启动外部Windows应用程序，隐藏程序界面
                ///
                ///应用程序路径名称
                /// true表示成功，false表示失败
                public static bool StartApp(string appName)
                {
                    return StartApp(appName, ProcessWindowStyle.Hidden);
                }
                ///
                /// 启动外部应用程序
                ///
                ///应用程序路径名称
                ///进程窗口模式
                /// true表示成功，false表示失败
                public static bool StartApp(string appName, ProcessWindowStyle style)
                {
                    return StartApp(appName, null, style);
                }
                ///
                /// 启动外部应用程序，隐藏程序界面
                ///
                ///应用程序路径名称
                ///启动参数
                /// true表示成功，false表示失败
                public static bool StartApp(string appName, string arguments)
                {
                    return StartApp(appName, arguments, ProcessWindowStyle.Hidden);
                }
                ///
                /// 启动外部应用程序
                ///
                ///应用程序路径名称
                ///启动参数
                ///进程窗口模式
                /// true表示成功，false表示失败
                public static bool StartApp(string appName, string arguments, ProcessWindowStyle style)
                {
                    bool blnRst = false;
                    Process p = new Process();
                    p.StartInfo.FileName = appName;//exe,bat and so on
                    p.StartInfo.WindowStyle = style;
                    p.StartInfo.Arguments = arguments;
                    try
                    {
                        p.Start();
                        p.WaitForExit();
                        p.Close();
                        blnRst = true;
                    }
                    catch
                    {
                    }
                    return blnRst;
                }
            }
    
        }
    }

完整示例代码

using System;
    using System.Collections.Generic;
    using System.Data;
    using System.Drawing;
    using System.IO;
    using System.Linq;
    using System.Threading;
    using System.Windows.Forms;
    using System.Windows.Forms.VisualStyles;
    using MySql.Data.MySqlClient;
    using mysqldatabak.Helper;
    
    namespace mysqldatabak
    {
        public partial class start_timer : Form
        {
            string connetStr = String.Empty;
            MySqlConnection mySqlConnection = null;
            String hostaddress = String.Empty;
            String databaseName = String.Empty;
            String name = String.Empty;
            String pass= String.Empty;
            List<string> tableNameList = new List<string>();
            List<string> selectedTableNameList = new List<string>();
            int bakCycleCount = 7;
            int currentBakCount = 1;
            //定时器
            System.Windows.Forms.Timer _timer = new System.Windows.Forms.Timer();
            public start_timer()
            {
                InitializeComponent();
            }
    
            private void connection_Click(object sender, EventArgs e)
            {
                PassForm passForm = new PassForm();
                passForm.ShowDialog();
                if (passForm.DialogResult == DialogResult.OK)
                {
                    hostaddress = this.host.Text.Trim();
                    databaseName = this.database.Text.Trim();
                    name = this.username.Text.Trim();
                    pass = this.password.Text.Trim();
                    connetStr = "server=" + hostaddress + ";User Id=" + name + ";password=" + pass + ";database=" + databaseName; //localhost不支持ssl连接时，最后一句一定要加！！！
                    mySqlConnection = new MySqlConnection(connetStr);
                    try
                    {
                        mySqlConnection.Open(); //连接数据库
                        MessageBox.Show("数据库连接成功", "提示", MessageBoxButtons.OK);
    
                    }
                    catch (MySqlException ex)
                    {
                        MessageBox.Show(ex.Message, "提示", MessageBoxButtons.OK);     //显示错误信息
                    }
                }
                else
                {
                    MessageBox.Show("密码不正确");
                }
    
            }
    
            #region 查询表所有数据
            private void button1_Click(object sender, EventArgs e)
            {
                PassForm passForm = new PassForm();
                passForm.ShowDialog();
                if (passForm.DialogResult == DialogResult.OK)
                {
                    string searchStr = "select * from " + this.tablename.Text;
                    MySqlDataAdapter adapter = new MySqlDataAdapter(searchStr, mySqlConnection);
                    DataSet dataSet = new DataSet();
                    adapter.Fill(dataSet, "table1");
                    this.dataGridView1.DataSource = dataSet.Tables["table1"];
                }
                else
                {
                    MessageBox.Show("密码不正确");
                }
    
            }
            #endregion
    
            private void button2_Click(object sender, EventArgs e)
            {
                PassForm passForm = new PassForm();
                passForm.ShowDialog();
                if (passForm.DialogResult == DialogResult.OK)
                {
                    mySqlConnection.Close();
                }
                else
                {
                    MessageBox.Show("密码不正确");
                }
              
            }
    
            #region 定时器启动
            private void button3_Click(object sender, EventArgs e)
            {
                PassForm passForm = new PassForm();
                passForm.ShowDialog();
                if (passForm.DialogResult == DialogResult.OK)
                {
                    string mysqlDumpPath = this.text_mysqldump_path.Text.Trim();
                    string tableName = this.text_one_table.Text.Trim();
                    string bakPath = this.textBox_bak_path.Text.Trim();
                    if (String.IsNullOrEmpty(tableName))
                    {
                        MessageBox.Show("表名不能为空！！！");
                    }
                    else if (String.IsNullOrEmpty(mysqlDumpPath))
                    {
                        MessageBox.Show("mysqldump的路径不能为空！！！");
                    }
                    else if (String.IsNullOrEmpty(bakPath))
                    {
                        MessageBox.Show("备份文件的路径不能为空！！！");
                    }
                    else
                    {
                        decimal interval = this.time_interval.Value * 1000;
                        _timer.Interval = (int)interval;
                        _timer.Tick += _timer_Tick;
                        _timer.Start();
                    }
    
                }
                else
                {
                    MessageBox.Show("密码不正确");
                }
    
            }
    
            private void _timer_Tick(object sender, EventArgs e)
            {
               
                this.log_text.AppendText("定时任务执行开始,执行时间:" + DateTime.Now.ToString());
                this.log_text.AppendText("\r\n");
                this.BackupDB();
                int count = this.log_text.Lines.GetUpperBound(0);
                this.log_text.AppendText("count="+count);
                this.log_text.AppendText("\r\n");
                this.log_text.AppendText("定时任务执行结束,执行时间:" + DateTime.Now.ToString());
                this.log_text.AppendText("\r\n");
                if (count>=500)
                {
                    this.log_text.Clear();
                }
    
            }
    
            #endregion
    
            private void stop_timer_Click(object sender, EventArgs e)
            {
                PassForm passForm = new PassForm();
                passForm.ShowDialog();
                if (passForm.DialogResult == DialogResult.OK)
                {
                    DialogResult AF = MessageBox.Show("您确定停止计时器吗？", "确认框", MessageBoxButtons.OKCancel, MessageBoxIcon.Question);
                    if (AF == DialogResult.OK)
                    {
                        _timer.Stop();
                    }
                    else
                    {
                        //用户点击取消或者关闭对话框后执行的代码
                    }
                }
                else
                {
                    MessageBox.Show("密码不正确");
                }
            }
    
            #region 获取所有表名
    
            private void button_getAllTableNames_Click(object sender, EventArgs e)
            {
                PassForm passForm = new PassForm();
                passForm.ShowDialog();
                if (passForm.DialogResult == DialogResult.OK)
                {
                    DataGridViewColumn checkCol = new DataGridViewCheckBoxColumn();
                    checkCol.Name = "选择";
                    this.dataGridView_show_tables_name.Columns.Add(checkCol);
                    DataTable tbName = mySqlConnection.GetSchema("Tables");
                    if (tbName.Columns.Contains("TABLE_NAME"))
                    {
                        foreach (DataRow dr in tbName.Rows)
                        {
                            tableNameList.Add((string)dr["TABLE_NAME"]);
                        }
                    }
                    this.dataGridView_show_tables_name.DataSource = this.tableNameList.Select(x => new { Value = x }).ToList();
                }
                else
                {
                    MessageBox.Show("密码不正确");
                }
            }
    
            #endregion
    
            #region 备份单表
            private void button4_Click(object sender, EventArgs e)
            {
                PassForm passForm = new PassForm();
                passForm.ShowDialog();
                //密码验证通过
                if (passForm.DialogResult == DialogResult.OK)
                {
                    string mysqlDumpPath = this.text_mysqldump_path.Text.Trim();
                    string tableName = this.text_one_table.Text.Trim();
                    if (String.IsNullOrEmpty(tableName))
                    {
                        MessageBox.Show("表名不能为空！！！");
                    }
                    else if (String.IsNullOrEmpty(mysqlDumpPath))
                    {
                        MessageBox.Show("mysqldump的路径不能为空！！！");
                    }
                    else
                    {
                        string cmdStr = mysqlDumpPath + " -h " + this.host.Text.Trim() + " -u" + this.username.Text.Trim() + " -p" + this.password.Text.Trim() + " " + this.database.Text.Trim() + " " + this.text_one_table.Text.Trim() + " > " + "\"" + this.textBox_bak_path.Text.Trim() + "\\" + "bus_area.sql\"";
                        CmdHelper.ExeCommand(cmdStr);
                    }
                }
                else
                {
                    MessageBox.Show("密码不正确");
                }
            }
    
            #endregion
    
            #region 备份数据实现
            public void  BackupDB()
    
            {
                this.bakCycleCount = (int)this.numericUpDown_cycle_count.Value;
                this.selectedTableNameList.Clear();
                for (int i = 0; i < this.dataGridView_show_tables_name.Rows.Count; i++)
                {
                    if ((bool)this.dataGridView_show_tables_name.Rows[i].Cells["选择"].EditedFormattedValue == true)
                    {
                        selectedTableNameList.Add(this.dataGridView_show_tables_name.Rows[i].Cells[1].Value.ToString());
                    }
                }
                for (int i = 0; i < this.selectedTableNameList.Count; i++)
                {
                    string mysqlDumpPath = this.text_mysqldump_path.Text.Trim();
                    string tableName = this.selectedTableNameList[i];
                    string cmdStr = mysqlDumpPath + " -h " + this.host.Text.Trim() + " -u" + this.username.Text.Trim() + " -p" + this.password.Text.Trim() + " " + this.database.Text.Trim() + " " + tableName + " > " + "\"" + this.textBox_bak_path.Text.Trim() + "\\" + tableName + "_" + currentBakCount + ".sql\"";
                    CmdHelper.ExeCommand(cmdStr);
                    this.log_text.AppendText(tableName + "_" + currentBakCount + "--备份完成,时间：" + DateTime.Now.ToString());
                    this.log_text.AppendText("\r\n");
                    //休眠1秒
                    Thread.Sleep(1000);
                }
                currentBakCount++;
                if (currentBakCount == bakCycleCount+1)
                {
                    currentBakCount = 1;
                }
            }
    
            #endregion
    
            private void button_select_path_Click(object sender, EventArgs e)
            {
                FolderBrowserDialog path = new FolderBrowserDialog();
                path.ShowDialog();
                this.textBox_bak_path.Text = path.SelectedPath;
            }
    
            #region 备份所有表
            private void button_bak_all_Click(object sender, EventArgs e)
            {
                PassForm passForm = new PassForm();
                passForm.ShowDialog();
                if (passForm.DialogResult == DialogResult.OK)
                {
                    DataTable tbName = mySqlConnection.GetSchema("Tables");
                    if (tbName.Columns.Contains("TABLE_NAME"))
                    {
                        foreach (DataRow dr in tbName.Rows)
                        {
                            string mysqlDumpPath = this.text_mysqldump_path.Text.Trim();
                            string tableName = (string)dr["TABLE_NAME"];
                            string cmdStr = mysqlDumpPath + " -h " + this.host.Text.Trim() + " -u" + this.username.Text.Trim() + " -p" + this.password.Text.Trim() + " " + this.database.Text.Trim() + " " + tableName + " > " + "\"" + this.textBox_bak_path.Text.Trim() + "\\" + tableName + ".sql\"";
                            CmdHelper.ExeCommand(cmdStr);
                            this.log_text.AppendText((string)dr["TABLE_NAME"] + "--备份完成");
                            this.log_text.AppendText("\r\n");
                        }
                    }
                }
                else
                {
                    MessageBox.Show("密码不正确");
                }
    
            }
            #endregion
    
            #region 备份选中的表
            private void button_bak_selected_table_Click(object sender, EventArgs e)
            {
                PassForm passForm = new PassForm();
                passForm.ShowDialog();
                if (passForm.DialogResult == DialogResult.OK)
                {
                    this.BackupDB();
                }
                else
                {
                    MessageBox.Show("密码不正确");
                }
              
            }
            #endregion
    
            #region 全选
            private void checkBox1_CheckedChanged(object sender, EventArgs e)
            {
                if (this.checkBox_select_all.Checked == true)
                {
                    for (int i = 0; i < this.dataGridView_show_tables_name.Rows.Count; i++)
                    {
                        this.dataGridView_show_tables_name.Rows[i].Cells["选择"].Value = 1;
                    }
                }
                else
                {
                    for (int i = 0; i < this.dataGridView_show_tables_name.Rows.Count; i++)
                    {
                        this.dataGridView_show_tables_name.Rows[i].Cells["选择"].Value = 0;
                    }
                }
            }
            #endregion
    
            private void start_timer_Load(object sender, EventArgs e)
            {
             
            }
    
            #region 输入密码才能关闭窗体
            private void start_timer_FormClosing(object sender, FormClosingEventArgs e)
            {
                PassForm passForm = new PassForm();
                passForm.ShowDialog();
                if (passForm.DialogResult == DialogResult.OK)
                {
                    e.Cancel = false;                 //关闭窗体
                }
                else
                {
                    MessageBox.Show("密码不正确");
                    e.Cancel = true;                  //不执行操作
                }
            }
            #endregion
        }
    }

# 效果 #

![2021100813430778.gif][]

#      #

[BADAO_LIUMANG_QIZHI_CSDN]: https://blog.csdn.net/badao_liumang_qizhi
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[Winform_Mysql8_BADAO_LIUMANG_QIZHI_-CSDN]: https://blog.csdn.net/BADAO_LIUMANG_QIZHI/article/details/120395988
[watermark_type_ZHJvaWRzYW5zZmFsbGJhY2s_shadow_50_text_Q1NETiBA6Zy46YGT5rWB5rCT5rCU6LSo_size_20_color_FFFFFF_t_70_g_se_x_16 1]: /images/20220828/a7e971e7ea164d6a8d0c5abaa7293b7d.png
[Winform_BADAO_LIUMANG_QIZHI_-CSDN]: https://blog.csdn.net/BADAO_LIUMANG_QIZHI/article/details/120565920
[watermark_type_ZHJvaWRzYW5zZmFsbGJhY2s_shadow_50_text_Q1NETiBA6Zy46YGT5rWB5rCT5rCU6LSo_size_20_color_FFFFFF_t_70_g_se_x_16 2]: /images/20220828/3d4e99e476954cc89869356a994e9271.png
[2021100813430778.gif]: /images/20220828/321bcf7e64524a3b8dac8cbdfe933e7d.png