[英]Occasional error opening .accdb database
我有一些代碼在Access數據庫中執行UPDATE
查詢。 有時它有效,有時我得到這個錯誤:
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.
這是代碼:
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();
知道是什么導致了這個嗎? 為什么它只在某些時候有效? 我在運行代碼時沒有在Access中打開實際的.accdb文件。
謝謝!
編輯:在運行上面的代碼之前,它運行此代碼就好了:
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();
你能抓住異常和內部異常嗎? 它應該對這個問題有所了解:
try
{
// Your Code Here
}
catch (OleDbException e)
{
Messagebox.Show(e.InnerException.Message);
}
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