C#动态创建Access数据库，创建加密码Access数据库，更改Access密

<p><span>using</span><span> System.IO;<br></span><span>using</span><span> System.Data.OleDb;        <br></span><span>//</span><span>连接Access数据库</span><span><br></span><span>using</span><span> ADOX;                              <br></span><span>//</span><span>引用COM：Microsoft ADO Ext. 2.8 for DDL and Security                                             <br></span><span>//</span><span>添加引用：Microsoft ActioveX Data Objects 2.8 Library</span></p>

<span>   1:</span> <span>string</span> conn = <span>"Provider=Microsoft.Jet.OLEDB.4.0;Data Source="</span> + fileName;

<span>   2:</span>             

<span>   3:</span> <span>//创建数据库</span>

<span>   4:</span> ADOX.Catalog catalog = <span>new</span> Catalog();

<span>   5:</span> <span>try</span>

<span>   6:</span> {

<span>   7:</span>     catalog.Create(conn); 

<span>   8:</span> }

<span>   9:</span> <span>catch</span>

<span>  10:</span> {}

<span>  11:</span>  

<span>  12:</span>  

<span>  13:</span> <span>//连接数据库</span>

<span>  14:</span> ADODB.Connection cn = <span>new</span> ADODB.Connection();

<span>  15:</span> cn.Open(conn, <span>null</span>, <span>null</span>, -1);                       

<span>  16:</span> catalog.ActiveConnection = cn;

<span>  17:</span>  

<span>  18:</span> <span>//新建表</span>

<span>  19:</span> ADOX.Table table = <span>new</span> ADOX.Table();

<span>  20:</span> table.Name = <span>"AdPlayList"</span>;

<span>  21:</span>  

<span>  22:</span> ADOX.Column column = <span>new</span> ADOX.Column();

<span>  23:</span> column.ParentCatalog = catalog;

<span>  24:</span> column.Type = ADOX.DataTypeEnum.adInteger; <span>// 必须先设置字段类型</span>

<span>  25:</span> column.Name = <span>"ID"</span>;

<span>  26:</span> column.DefinedSize = 9;

<span>  27:</span> column.Properties[<span>"AutoIncrement"</span>].Value = <span>true</span>;

<span>  28:</span> table.Columns.Append(column, DataTypeEnum.adInteger, 0);

<span>  29:</span> <span>//设置主键</span>

<span>  30:</span> table.Keys.Append(<span>"PrimaryKey"</span>, ADOX.KeyTypeEnum.adKeyPrimary, <span>"ID"</span>, <span>""</span>, <span>""</span>);

<span>  31:</span>  

<span>  32:</span> table.Columns.Append(<span>"FileName"</span>, DataTypeEnum.adVarWChar, 50);

<span>  33:</span> table.Columns.Append(<span>"FileDate"</span>, DataTypeEnum.adDate, 0);

<span>  34:</span> table.Columns.Append(<span>"FileSize"</span>, DataTypeEnum.adInteger, 9);

<span>  35:</span> table.Columns.Append(<span>"OrderID"</span>, DataTypeEnum.adInteger, 9);

<span>  36:</span> table.Columns.Append(<span>"Sha1"</span>, DataTypeEnum.adVarWChar, 50);

<span>  37:</span>  

<span>  38:</span> <span>try</span>

<span>  39:</span> {

<span>  40:</span>     catalog.Tables.Append(table);

<span>  41:</span> }

<span>  42:</span> <span>catch</span> (Exception ex)

<span>  43:</span> {

<span>  44:</span>     MessageBox.Show(ex.Message);

<span>  45:</span> }

<span>  46:</span> <span>//此处一定要关闭连接，否则添加数据时候会出错</span>

<span>  47:</span>  

<span>  48:</span> table = <span>null</span>;

<span>  49:</span> catalog = <span>null</span>;

<span>  50:</span> Application.DoEvents();

<span>  51:</span> cn.Close();

<span>   1:</span> <span>//创建不带密码的连接语句</span>

<span>   2:</span> <span>string</span> conn = <span>"Provider=Microsoft.Jet.OLEDB.4.0;Data Source="</span> + fileName;

<span>   3:</span> <span>//创建加密码的连接语句，pwd是密码</span>

<span>   4:</span> <span>string</span> conn = <span>"Provider=Microsoft.Jet.OLEDB.4.0;Data Source="</span> + fileName + <span>";<br>     Jet OLEDB:Database Password="</span> + Pwd + <span>";Jet OLEDB:Engine Type=5"</span>;            

<p><span>ALTER</span><span>DATABASE</span><span> PASSWORD </span><span>[</span><span>NewPassword</span><span>]</span><span>[</span><span>OldPassword</span><span>]</span></p>

<span>   1:</span> <span>string</span> conn = <span>"Provider=Microsoft.Jet.OLEDB.4.0;Data Source="</span> + fileName + <span>";<br>      Jet OLEDB:Database password="</span> + openpwd;

<span>   2:</span> <span>string</span> sql = <span>"ALTER DATABASE PASSWORD "</span> + newpwd + <span>" "</span> + openpwd;

<span>   3:</span> ADODB.Connection cn = <span>new</span> ADODB.Connection();

<span>   4:</span> cn.Mode = ADODB.ConnectModeEnum.adModeShareExclusive;

<span>   5:</span> cn.Open(conn, <span>null</span>, <span>null</span>, -1);

<span>   6:</span> <span>// 执行 SQL 语句以更改密码。</span>

<span>   7:</span> <span>object</span> num;

<span>   8:</span> cn.Execute(sql, <span>out</span> num, -1);

<span>   9:</span> cn.Close();