打开.accdb数据库时偶尔出错

本文关键字：偶尔 出错 数据库 accdb 打开 | 更新日期: 2023-09-27 18:28:31

我有一些代码可以在Access数据库中执行UPDATE查询。有时它工作，有时我得到这个错误：

An unhandled exception of type 'System.Data.OleDb.OleDbException' occurred in System.Data.dll
Additional information: Cannot open database ''.  It may not be a database that your application recognizes, or the file may be corrupt.

这是代码：

string[] lines = File.ReadAllLines(file, Encoding.GetEncoding(1252));   //read as ANSI encoding
OleDbConnection con = new OleDbConnection("Provider=Microsoft.ACE.OLEDB.12.0; Data Source=c:''myDatabase.accdb");
con.Open();
for (int i = 2; i < lines.Length - 1; i++)  //ignore the first 2 lines
{
    string line = lines[i];         //get the current line
    string[] values = line.Split(''t');     //split line at the tabs
    using (OleDbCommand com = new OleDbCommand("INSERT INTO [myTable](" +
        "[Field1], [Field1], [Field1], [Field1], [Field1], [Field1], [Field1], [Field1], [Field1], [Field1], " +
   "[Field1], [Field1], [Field1], [Field1], [Field1], [Field1], [Field1], [Field1], [Field1], [Field1]" +
   "[Field1], [Field1], [Field1]" +
   ") VALUES (" +
   "?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?" +
   ")", con))
    {
        for (int y = 0; y < 23; y++)
   {
       if (values[y] != "")
       {
           com.Parameters.Add("@p" + y + "", OleDbType.Char, 255).Value = (object)values[y] ?? DBNull.Value;
       }
       else
       {
           com.Parameters.Add("@p" + y + "", OleDbType.Char, 255).Value = DBNull.Value;
       }
        }     
        com.ExecuteNonQuery();
    }
}
con.Close();

知道是什么原因造成的吗？为什么它只在某些时候起作用？在运行代码时，我没有在Access中打开实际的.accdb文件。

谢谢！

编辑：在运行上面的代码之前，它运行这个代码很好：

        OleDbConnection con = new OleDbConnection("Provider=Microsoft.ACE.OLEDB.12.0; Data Source=c:''myDatabase.accdb");
        con.Open();
        string strCreate = "CREATE TABLE [myTable](" +
                            "[Field1] Text(255), " +            
                            "[Field1] Text(255), " +          
                            "[Field1] Text(255), " +             
                            "[Field1] Text(255), " +
                            "[Field1] Text(255), " +
                            "[Field1] Text(255), " +
                            "[Field1] Text(255), " +
                            "[Field1] Text(255), " +
                            "[Field1] Text(255), " +
                            "[Field1] Text(255), " +
                            "[Field1] Text(255), " +
                            "[Field1] Text(255), " +
                            "[Field1] Text(255), " +
                            "[Field1] Text(255), " +
                            "[Field1] Text(255), " +
                            "[Field1] Text(255), " +
                            "[Field1] Text(255), " +
                            "[Field1] Text(255), " +
                            "[Field1] Text(255), " +
                            "[Field1] Text(255), " +
                            "[Field1] Text(255), " +
                            "[Field1] Text(255), " +
                            "[Field1] Text(255))";              
        OleDbCommand cCom = new OleDbCommand(strCreate, con);
        cCom.ExecuteNonQuery();
        cCom.Connection.Close();

打开.accdb数据库时偶尔出错

您能捕获异常和内部异常吗？它应该能揭示这个问题：

    try
    {
        // Your Code Here
    }
    catch (OleDbException e)
    {
        Messagebox.Show(e.InnerException.Message);
    }
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