Question

我在访问数据库中有一个名为“Streets”的表，我已经用

打开了一个连接

OleDbConnection con = OleDbConnection(@"Provider=Microsoft.Jet.OLEDB.4.0;" + @"Data source=" + mdbFileName);

我怎样才能到达我的桌旁？

Answer 1

您需要'更改'表并使用ExecuteNonQuery。代码如下：

Dim dbName As String = "<path>\mdbFileName.mdb"
Dim tmpConString As String = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" & dbName & ";Persist Security Info=False"

Dim sqlText As String = ""
Using cn As New OleDbConnection(tmpConString)
  cn.Open()
  sqlText = "ALTER TABLE Table1 ADD COLUMN fldNew TEXT(50)"

  Using cm As New OleDbCommand(sqlText, cn)
    cm.ExecuteNonQuery()
  End Using
End Using

这会在您的数据库中添加一个名为“fldNew”的新列。然后，您可以使用标准的UPDATE SQL命令将数据添加到新列中。

Answer 2

将ADOX COM引用添加到项目中并尝试以下代码：

using ADOX;

//...
private void Test() {
    string connString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=<path to your .mdb>";
    CatalogClass cat = new CatalogClass();
    cat.let_ActiveConnection(connString);

    RenameField(cat, "YourTableName", "OriginalFieldName", "NewFieldName");
    AddField(cat, "YourTableName", "YourNewFieldName", DataTypeEnum.adVarWChar, 50, "");
}

// Rename a field.
private void RenameField(CatalogClass cat, string tableName, string originalFieldName, string newFieldName) {
    cat.Tables[tableName].Columns[originalFieldName].Name = newFieldName;
}

// Add a field to a specified table.
private void AddField(ADOX.CatalogClass cat, string tableName, string newFieldName, DataTypeEnum varType, int size, string defaultValue) {
    ColumnClass col = new ColumnClass();
    col.Name = newFieldName;
    col.Type = varType;
    col.DefinedSize = size;
    col.Attributes = ColumnAttributesEnum.adColNullable;
    cat.Tables[tableName].Columns.Append((object)col, DataTypeEnum.adInteger, 0);

    if (!string.IsNullOrEmpty(defaultValue)) {
        col.Properties["Default"].Value = defaultValue;
    }

}

详细信息可以在以下博客文章中找到：

Rename Field in MS Access Programmatically using ADOX (C#.NET)
Add New Field in MS Access Programmatically using ADOX (C#.Net)

使用标准ADO.net将数据添加到新字段。

如何使用.NET操作Access数据库中的表

2 个答案: