同上篇，主要是参考dOOdad文档，并加入了一些自己的理解。
1. 数据绑定：
(1) 绑定到DataGrid(WebApp)
if(emps.LoadAll())
{
dvEmps = emps.DefaultView;
dgEmps.DataSource = dvEmps;
dgEmps.DataBind();
}
(2) 绑定到ComboBox(WinApp)
//get data
emps.Query.AddResultColumn(Employees.ColumnNames.EmployeeID);
emps.Query.AddResultColumn(Employees.ColumnNames.LastName);
emps.Query.AddOrderBy(Employees.ColumnNames.LastName,
WhereParameter.Dir.ASC);
emps.Query.Load();
//bind to combobox
cmbEmployees.DisplayMember = Employees.ColumnNames.LastName;
cmbEmployees.ValueMember = Employees.ColumnNames.EmployeeID;
cmbEmployees.Datasource = emps.DefaultView;
(3) 绑定到DropDownList(WebApp)
//get data
emps.Query.AddResultColumn(Employees.ColumnNames.EmployeeID);
emps.Query.AddResultColumn(Employees.ColumnNames.LastName);
emps.Query.AddOrderBy(Employees.ColumnNames.LastName,
WhereParameter.Dir.ASC);
emps.Query.Load();
//bind to drop-down list
ddlEmployees.Datasource = emps.DefaultView;
ddlEmployees.DataTextField = Employees.ColumnNames.LastName;
ddlEmployees.DataValueField = Employees.ColumnNames.EmployeeID;
ddlEmployees.Databind();
2. 特殊函数：执行自定义存储过程和SQL语句
Examples:
（1）LoadFromSql: (从数据库中检索并返回检索结果集,查询结果保存到DataTable中)
ListDictionary Parms = new ListDictionary();
Parms.Add("@parameterName1", value1);
Parms.Add("@parameterName2", value2);
parms.Add……
if(this.LoadFromSql("proc_GetSpecialEmployee", Parms))
{
...
}
（2）LoadFromSqlNoExec: (执行无结果集的存储过程，返回受影响的行数)
int NbrOfChecks = this.LoadFromSqlNoExec("proc_CalculatePayroll");
例如：删除一条记录，dOOdad提供的文档中的方法是：先LoadByPrimaryKey,再MarkAsDeleted,最后再Save进数据库；这个过程要对数据库进行两次操作。实际上，我们可以只操作一次数据库(直接用dOOdads模板生成的存储过程)，而不用先Load。
ListDictionary Parms = new ListDictionary();
Parms.Add("@ID", empID);
int effectLine = this.LoadFromSqlNoExec("proc_EmployeeDelete",Parms);
（3）LoadFromSqlReader:(返回SqlDataReader)
SqlDataReader rdr = this.LoadFromSqlReader("proc_GetSpecialEmployee", Parms) as SqlDataReader;
（4）LoadFromSqlScalar:(返回单个值)
DateTime EarliestHireDate;
ListDictionary Parms = new ListDictionary();
Parms.Add("@Active", 1);
EarliestHireDate = Convert.ToDateTime(this.LoadFromSqlScalar("GetEarliestHireDate",Parms));
（5）LoadFromRawSql:
this.LoadFromRawSql("SELECT MIN(EM_HireDate) FROM tEmployees WHERE EM_Active = {0}","1");
3. 事务处理:
TransactionMgr tx = TransactionMgr.ThreadTransactionMgr();
try
{
Employees emps = new Employees();
emps.AddNew();
emps.FirstName = "Jimmy";
emps.LastName = "Doe";
Products prds = new Products();
prds.AddNew();
prds.ProductName = " Lunch Box ";
prds.Discontinued = false;
tx.BeginTransaction();
emps.Save();
prds.Save();
tx.CommitTransaction();
}
catch(Exception ex)
{
tx.RollbackTransaction();
TransactionMgr.ThreadTransactionMgrReset();
}