.NET 连接到 dBase .dbf 文件
我正在尝试使用 .NET 和 Winforms 读取 dBase III .dbf 文件,但我尝试过的任何操作似乎都不起作用。我尝试了四种不同的连接方法,每一种都挂在 Open
方法上。没有例外,没有超时,没有事件消息,什么都没有。表格就放在那里。关于可能出什么问题的任何想法吗?
这是我尝试过的方法。 .dbf 文件位于 d:\db:
private void read1()
{
string c = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=d:\\db\\;Extended Properties=dBASE III";
OleDbConnection conn = new OleDbConnection(c);
conn.Open();
MessageBox.Show("ok");
conn.Close();
}
private void read2()
{
System.Data.Odbc.OdbcConnection oConn = new System.Data.Odbc.OdbcConnection();
oConn.ConnectionString = @"Driver={Microsoft dBase Driver (*.dbf)};SourceType=DBF;SourceDB=D:\db;Exclusive=No; Collate=Machine;NULL=NO;DELETED=NO;BACKGROUNDFETCH=NO;";
oConn.Open();
System.Data.Odbc.OdbcCommand oCmd = oConn.CreateCommand();
oCmd.CommandText = @"SELECT * FROM D:\db\Poi.dbf";
DataTable dt = new DataTable();
dt.Load(oCmd.ExecuteReader());
MessageBox.Show(dt.Rows.Count.ToString());
oConn.Close();
}
private void read3()
{
System.Data.Odbc.OdbcConnection oConn = new System.Data.Odbc.OdbcConnection();
oConn.ConnectionString = @"Driver={Microsoft dBASE Driver (*.dbf)};DriverID=277;Dbq=d:\db;";
oConn.Open();
MessageBox.Show("ok");
oConn.Close();
}
private void read4()
{
System.Data.Odbc.OdbcConnection oConn = new System.Data.Odbc.OdbcConnection();
oConn.ConnectionString = @"Driver={Microsoft dBase Driver (*.dbf)};datasource=d:\db\";
oConn.Open();
System.Data.Odbc.OdbcCommand oCmd = oConn.CreateCommand();
oCmd.CommandText = @"SELECT * FROM D:\db\Poi.dbf";
DataTable dt = new DataTable();
dt.Load(oCmd.ExecuteReader());
MessageBox.Show(dt.Rows.Count.ToString());
oConn.Close();
}
I'm trying to read a dBase III .dbf file using .NET and Winforms and nothing I've tried seem to work. I tried four different connection methods and every one of them hangs on Open
method. No exceptions, no timeouts, no event messages, nothing. The form just sits there. Any ideas about what could be wrong?
Here's the methods I've tried. The .dbf file is at d:\db:
private void read1()
{
string c = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=d:\\db\\;Extended Properties=dBASE III";
OleDbConnection conn = new OleDbConnection(c);
conn.Open();
MessageBox.Show("ok");
conn.Close();
}
private void read2()
{
System.Data.Odbc.OdbcConnection oConn = new System.Data.Odbc.OdbcConnection();
oConn.ConnectionString = @"Driver={Microsoft dBase Driver (*.dbf)};SourceType=DBF;SourceDB=D:\db;Exclusive=No; Collate=Machine;NULL=NO;DELETED=NO;BACKGROUNDFETCH=NO;";
oConn.Open();
System.Data.Odbc.OdbcCommand oCmd = oConn.CreateCommand();
oCmd.CommandText = @"SELECT * FROM D:\db\Poi.dbf";
DataTable dt = new DataTable();
dt.Load(oCmd.ExecuteReader());
MessageBox.Show(dt.Rows.Count.ToString());
oConn.Close();
}
private void read3()
{
System.Data.Odbc.OdbcConnection oConn = new System.Data.Odbc.OdbcConnection();
oConn.ConnectionString = @"Driver={Microsoft dBASE Driver (*.dbf)};DriverID=277;Dbq=d:\db;";
oConn.Open();
MessageBox.Show("ok");
oConn.Close();
}
private void read4()
{
System.Data.Odbc.OdbcConnection oConn = new System.Data.Odbc.OdbcConnection();
oConn.ConnectionString = @"Driver={Microsoft dBase Driver (*.dbf)};datasource=d:\db\";
oConn.Open();
System.Data.Odbc.OdbcCommand oCmd = oConn.CreateCommand();
oCmd.CommandText = @"SELECT * FROM D:\db\Poi.dbf";
DataTable dt = new DataTable();
dt.Load(oCmd.ExecuteReader());
MessageBox.Show(dt.Rows.Count.ToString());
oConn.Close();
}
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评论(2)
试试这个:
我刚刚运行了这个,没有错误。这个网站非常有用:ConnectionStrings.com
Try this:
I just ran this without errors. And this site can be very useful: ConnectionStrings.com
简单来说它无法工作,因为 64 位系统不再支持 64 位的 odbc dbf 驱动程序,jet 也不再存在。
Simply it cannot work since 64 bit systems no more support odbc dbf driver for 64 bit nor jet exists anymore..