Access Operation Using ADOX and OleDb(C#操作Access数据库)

　　Now, we are talking something about Office Access(2007) operation using C#. And I will show you how to create a access db file, including creating new table, insert and update data item. Before we start coding, we should add references "Microsoft ADO Ext. 2.8 for DDL and Security" and "Microsoft ActiveX Data Objects 2.8 Library", and of course the related namespace.

　　1. Create new Access database using ADOX:

/**//// <summary>
/// Create access db file, add a new table with columns.
/// </summary>
/// <param name="accessFile">Access db file to be created</param>
public void CreateDatabaseUsingADOX(string accessFile)
{
    try
    {
        ADOX.CatalogClass cat = new ADOX.CatalogClass();

        if (!File.Exists(accessFile))
        {
            cat.Create("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + accessFile + ";");
            //cat = null;
        }
        cat = null;                
    }
    catch (Exception e)
    {
        Console.WriteLine(e.Message);
        Console.WriteLine(e.Source);
    }
}

　　2. Next we will create a new table with several columns for this database, first we try to use ADOX:

/**//// <summary>
/// Create new table and add columns.
/// </summary>
/// <param name="accessFile">Access db file</param>
public void CreateTableUsingADOX(string accessFile)
{
    try
    {
        ADOX.CatalogClass cat = new ADOX.CatalogClass();

        ADODB.Connection conn = new ADODB.Connection();
        conn.Open("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + accessFile, null, null, -1);
        cat.ActiveConnection = conn;

        //Create a new table
        ADOX.TableClass tbl = new ADOX.TableClass();
        tbl.ParentCatalog = cat;
        tbl.Name = "MyTable";

        //Add an automatic increasing column
        ADOX.ColumnClass col = new ADOX.ColumnClass();
        col.ParentCatalog = cat;
        //First set data type
        col.Type = ADOX.DataTypeEnum.adInteger;
        //Column name
        col.Name = "ID";
        col.Properties["Jet OLEDB:Allow Zero Length"].Value = false;
        col.Properties["AutoIncrement"].Value = true;
        tbl.Columns.Append(col, ADOX.DataTypeEnum.adInteger, 0);

        //Add a text column
        ADOX.ColumnClass col2 = new ADOX.ColumnClass();
        col2.ParentCatalog = cat;
        col2.Name = "Description";
        col2.Properties["Jet OLEDB:Allow Zero Length"].Value = false;
        tbl.Columns.Append(col2, ADOX.DataTypeEnum.adVarChar, 25);

        //Set primary key
        tbl.Keys.Append("PrimaryKey", ADOX.KeyTypeEnum.adKeyPrimary, "id", "", "");

        //Append the table to db file
        cat.Tables.Append(tbl);

        conn.Close();
        tbl = null;
        cat.ActiveConnection = null;
        cat = null;
    }
    catch (Exception e)
    {
        Console.WriteLine(e.Message);
        Console.WriteLine(e.Source);
    }
}

　　3. And we can also use OleDb command to create new table, let's have a look:

/**//// <summary>
/// Create new table with columns.
/// </summary>
/// <param name="accessFile">Access db file</param>
public void CreateTableUsingOleDbCommand(string accessFile)
{
    try
    {
        string connstr = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + accessFile + ";";
        OleDbConnection accessConn = new OleDbConnection(connstr);
        accessConn.Open();
        //Create a new table

        OleDbCommand myCommand = new OleDbCommand("create table MyTable (ID integer not null,Description char(50),primary key(ID))", accessConn);
        myCommand.ExecuteNonQuery();

        accessConn.Close();
    }
    catch (Exception e)
    {
        Console.WriteLine(e.Message);
        Console.WriteLine(e.Source);
    }
}

　　4. Following are 'insert', 'query', 'update' and 'delete' operations:

/**//// <summary>
/// Query and update data from table using OleDb command
/// </summary>
/// <param name="accessFile">Access db file</param>
public void QueryAndUpdateUsingOleDbCommand(string accessFile)
{
    try
    {
        //Suppose the table name is 'MyTable'
        string connstr = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + accessFile + ";";
        OleDbConnection accessConn = new OleDbConnection(connstr);
        accessConn.Open();

        //Insert data to DB table.
        //No need to insert data for automatic increasing column.
        string strCmd = String.Format("insert into MyTable(ID, Description) values('{0}','{1}')", 1, "This is the first row");
        OleDbCommand cmd = new OleDbCommand(strCmd, accessConn);
        cmd.ExecuteNonQuery();
        strCmd = String.Format("insert into MyTable(ID, Description) values('{0}','{1}')", 2, "This is the second row");
        cmd = new OleDbCommand(strCmd, accessConn);
        cmd.ExecuteNonQuery();
        
        //Query
        strCmd = String.Format("select * from MyTable");
        cmd = new OleDbCommand(strCmd, accessConn);
        OleDbDataReader odrReader = cmd.ExecuteReader();
        while(odrReader.Read())
        {
            //Get data according to column name.
            Console.WriteLine(odrReader["ID"].ToString() + " " + odrReader["Description"].ToString());
        }

        //Update
        strCmd = String.Format("update MyTable set Description = '{0}' where ID = {1}", "This is row 1", 1);
        cmd = new OleDbCommand(strCmd, accessConn);
        cmd.ExecuteNonQuery();                

        //Delete
        strCmd = String.Format("delete from MyTable where ID = 2");
        cmd = new OleDbCommand(strCmd, accessConn);
        cmd.ExecuteNonQuery();                
        accessConn.Close();
    }
    catch (Exception e)
    {
        Console.WriteLine(e.Message);
        Console.WriteLine(e.Source);
    }
}

 

I have already had a test for all the functions, if you get any problem please let me know.

 

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