[转]c#创建access查询

I found out how to accomplish creating queries in Access using C# so I thought I would post my solution to this in case anyone else ever has a need to do this via C#.
  I had to add a reference to DAO.dll version 3.6 (found on my machine in c:\Program Files\Common Files\Microsoft Shared\DAO).
  Some of this code is part of my source code generator but I am sure you can follow the code.
  /// <summary>
/// This method creates a query for an Access Database Table.
 /// </summary> ///  /// <returns></returns> public static bool CreateQuery(DataTable dataTable, QueryTypeEnum queryType) { // initial value bool queryCreated = false;  // locals string queryName = ""; string queryText = ""; string path = @"D:\RAD Studio\RADStudioClient\DataClassBuilder.mdb"; 
 try {  // if the dataTable exists if ((dataTable != null) && (dataTable.HasPrimaryKey)) { // Create DAO Connection, Workspace & Database. dao._DBEngine dbEngine = new dao.DBEngine(); dao.Workspace workSpace = dbEngine.CreateWorkspace("MainWorkspace", "admin", "", dao.WorkspaceTypeEnum.dbUseJet); dao.Database db = workSpace.OpenDatabase(path, false, false, Type.Missing);  // Determine the action to take based upon the // queryType. switch(queryType) { case QueryTypeEnum.Delete:  // set queryName queryName = dataTable.Name + "_Delete"; queryText = CreateQueryText(dataTable, QueryTypeEnum.Delete);  // required break break; 
 case QueryTypeEnum.FetchAll:  // set queryName queryName = dataTable.Name + "_FetchAll"; queryText = CreateQueryText(dataTable, QueryTypeEnum.FetchAll);  // required break break;  case QueryTypeEnum.Find:  // set queryName queryName = dataTable.Name + "_Find"; queryText = CreateQueryText(dataTable, QueryTypeEnum.Find); 
 // required break break;  case QueryTypeEnum.Insert:  // set queryName queryName = dataTable.Name + "_Insert"; queryText = CreateQueryText(dataTable, QueryTypeEnum.Insert);  // required break break;  case QueryTypeEnum.Update: 
 // set queryName queryName = dataTable.Name + "_Update"; queryText = CreateQueryText(dataTable, QueryTypeEnum.Update); 
 // required break break; }  // Delete Query In Case It Already Exists DeleteQuery(queryName, db);  // Create QueryDef QueryDef query = db.CreateQueryDef(queryName, queryText); 
 // if the query was created if (query != null) { // query was created queryCreated = true; } } } catch(Exception error) {
 // Inform User of error MessageBox.Show("An error occurred connecting to the local database." + Environment.NewLine + error.ToString(), "Data Error", MessageBoxButtons.OK, MessageBoxIcon.Information); } 
 // return value return queryCreated; }