OLE DB 是用於訪問數據的基於 COM 的應用程序編程接口 (API)。OLE DB 支持訪問以 OLE DB 提供程序可以使用的任何格式（數據庫、電子表格、文本文件等）存儲的數據。每個 OLE DB 提供程序從某一特定類型的數據源（例如 SQL Server 數據庫、Microsoft Access 數據庫或 Microsoft Excel 電子表格）公開數據。
本教程說明如何從 C# 應用程序中使用 Microsoft Access 數據庫。
本教程說明如何從 C# 中使用 Microsoft Access 數據庫。它顯示如何創建數據集並從數據庫向該數據集添加表。本示例程序中使用的 BugTypes.mdb 數據庫是 Microsoft Access 2000 .MDB 文件。
本程序訪問 BugTypes.mdb 數據庫，創建一個數據集並向其中添加表，然後顯示表、列和行的數目。它還顯示每行的標題。
// OleDbSample.cs
using System;
using System.Data;
using System.Data.OleDb;
using System.Xml.Serialization;
public class MainClass {
public static void Main ()
{
// Set Access connection and select strings.
// The path to BugTypes.MDB must be changed if you build
// the sample from the command line:
#if USINGPROJECTSYSTEM
string strAccessConn = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=..\\..\\BugTypes.MDB";
#else
string strAccessConn = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=BugTypes.MDB";
#endif
string strAccessSelect = "SELECT * FROM Categories";
// Create the dataset and add the Categories table to it:
DataSet myDataSet = new DataSet();
OleDbConnection myAccessConn = null;
try
{
myAccessConn = new OleDbConnection(strAccessConn);
}
catch(Exception ex)
{
Console.WriteLine("Error: Failed to create a database connection. \n{0}", ex.Message);
return;
}
try
{
OleDbCommand myAccessCommand = new OleDbCommand(strAccessSelect,myAccessConn);
OleDbDataAdapter myDataAdapter = new OleDbDataAdapter(myAccessCommand);
myAccessConn.Open();
myDataAdapter.Fill(myDataSet,"Categories");
}
catch (Exception ex)
{
Console.WriteLine("Error: Failed to retrieve the required data from the DataBase.\n{0}", ex.Message);
return;
}
finally
{
myAccessConn.Close();
}
// A dataset can contain multiple tables, so let's get them
// all into an array:
DataTableCollection dta = myDataSet.Tables;
foreach (DataTable dt in dta)
{
Console.WriteLine("Found data table {0}", dt.TableName);
}
// The next two lines show two different ways you can get the
// count of tables in a dataset:
Console.WriteLine("{0} tables in data set", myDataSet.Tables.Count);
Console.WriteLine("{0} tables in data set", dta.Count);
// The next several lines show how to get information on
// a specific table by name from the dataset:
Console.WriteLine("{0} rows in Categories table", myDataSet.Tables["Categories"].Rows.Count);
// The column info is automatically fetched from the database,
// so we can read it here:
Console.WriteLine("{0} columns in Categories table", myDataSet.Tables["Categories"].Columns.Count);
DataColumnCollection drc = myDataSet.Tables["Categories"].Columns;
int i = 0;
foreach (DataColumn dc in drc)
{
// Print the column subscript, then the column's name
// and its data type[1] [2] 下一頁
:
Console.WriteLine("Column name[{0}] is {1}, of type {2}",i++ , dc.ColumnName, dc.DataType);
}
DataRowCollection dra = myDataSet.Tables["Categories"].Rows;
foreach (DataRow dr in dra)
{
// Print the CategoryID as a subscript, then the CategoryName:
Console.WriteLine("CategoryName[{0}] is {1}", dr[0], dr[1]);
}
}
}
BugTypes.mdb 數據庫的 Categories 表包含下列信息：
當運行此示例時，屏幕上將顯示下列輸出：
Found data table Categories 1 tables in data set 1 tables in data set 4 rows in Categories table 2 columns in Categories table Column name[0] is CategoryID, of type System.Int32 Column name[1] is CategoryName, of type System.String CategoryName[1] is Bugbash Stuff CategoryName[2] is Appweek Bugs CategoryName[3] is .NET Framework Reports CategoryName[4] is Internal Support
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