保存包含多个表的数据集

本文关键字:数据集 包含多 保存 | 更新日期: 2023-09-27 18:30:31

对于我正在从事的项目,我正在使用从服务器下载的 Access 数据库来存储数据。下载文件后,我打开数据库并将其复制到数据集中,以便更轻松地编辑数据。

我现在遇到的问题是我需要将数据集保存回 access 数据库,但在程序执行期间我也向数据集添加了新列,那么有没有办法更新存储在 E:'' 上的访问数据库使用新数据和列下载后驱动器,或者我必须从头开始创建一个新数据库。

我用来加载和复制数据集的代码

private void accessConnect()
    {
        //Assign values to access database variables 
        Connection = new OleDbConnection();
        command = new OleDbCommand();
        adapter = new OleDbDataAdapter();
        databaseDataSet = new DataSet();
        //Assign location of database to connection variable 
        connection.ConnectionString =
            @"Provider=Microsoft.ACE.OLEDB.12.0;Data Source=E:'EAttendance.accdb;" +
            "Persist Security Info=False";
        //Establish connection with database
        command.Connection = connection;
        //Copy all tables into a c# dataset 
        try
        {
            //Select the user table in the database
            command.CommandText = "SELECT * FROM users";
            adapter.SelectCommand = command;
            //Copy table into dataset 
            adapter.Fill(databaseDataSet,"users");
            //Select the students table in the database
            command.CommandText = "SELECT * FROM students";
            adapter.SelectCommand = command;
            //copy the students database into the dataset 
            adapter.Fill(databaseDataSet, "students");
        }
        //catch exception and display error if application fails to read database 
        catch (OleDbException)
        {
            //Display error in form title bar
            this.Text = "Error #102 : Database Read Error";
            // Set connection value to false
            connectionBoolean = false; 
        }

    }

保存包含多个表的数据集

你错过的是SQLDataReader

public SQLDataReader someReader
{
 get {return this.Reader("students");}
}